Archive of Our Own ^beta

Chapter Text

“I don’t understand why you’re so against this!” Izuku screamed. 

“What’s so hard to understand? I don’t want you presenting yourself in lingerie for everyone to see!” His father yelled back. Katsuki was pacing back and forth, shooting angry looks at Izuku every third step. 

“I’m not going to! All Nana wants to do is start having me wear the presented collection instead of the unpresented lines.”

“That’s hardly any better than lingerie! Have you seen what our presented models wear? It’s indecent.”

“You're being irrational, it's not and you know it – Nana designs it! And it’s everyday clothing. No underwear modelling, Nana promised!”

“Just you wait. That demon of a grandmother of yours has been dying for the day she can make you the face of her adult line.”

Izuku had frustrated tears falling down his face. Normally, that would be enough to have his father cooing over him, but Katsuki seemed too fixated on his point today. 

“Daddy,” he begged, hoping it would make Katsuki soften. It didn’t. “I promise she hasn’t asked me to become a lingerie model.”

Izuku had thought that would be enough, but Katsuki just snarled. “Oh yeah? Then explain this, Izuku. I’ve certainly never bought you underwear like this.” He reached into his pocket and pulled out a scrap of fabric that made Izuku’s entire face burst into flames. It was a silky red thong. Strappy and lacy and beautiful and it barely covered anything when he wore it.

They were also undoubtedly Izuku’s. He’d put them in his wash basket without even thinking about the fact that his father might find them. 

Embarrassment and panic surged thickly through him. Still, he had to try and deny it. “I don’t know what you’re talking about. They must be mums.” His voice quivered with his lie and he knew his dad picked up on it. 

“And she put them in your wash basket? I could smell you on them, Izuku. Don’t even try to lie to me.”

Izuku’s face burned even brighter. Embarrassment turned into anger. “Why were you looking through my washing anyway when we have a maid for that?! Why keep them? Just to prove a point? I’m seventeen – I’m allowed to buy my own underwear.”

“Not underwear like this! And don’t try to turn this on me, you know I always do my own washing–" due to a few too many cases of maids stealing Katsuki's clothes– "and I just needed a few extra bits to make a proper load… I always knew that the hag would corrupt you. These are from our upcoming summer line. There’s no way you bought these yourself. That hag is trying to get you to display yourself like some sort of - some sort of slut!”

Izuku gasped, hurt. Tears poured down his face in thick streams. Even Katsuki lurched, the wrathful look on his face fading for instant remorse as he recognised the scent of hurt emanating from Izuku. But Katsuki had never been the best at apologising. Especially when he felt that he was in the right. 

“You came home late yesterday smelling of that foul alpha from next door. Did you wear these when you were with him? Was it a date? Did you let him touch you? Have you been going behind my back this entire time?”

The questions came too fast. So overwhelming and nonsensical, jumping from suspicion to suspicion that Izuku couldn’t keep up. How had this turned from a fight about him modelling for Nana to being about Izuku apparently dating Shouto next door? Katsuki knew he and Izuku were just best friends.

“I’m your alpha, Izuku, you can’t date without my permission, and I absolutely do not grant it. I can’t believe you let another alpha even touch you.” The disappointment in his daddy’s voice made Izuku want to whine and submit to the head alpha of his family pack, desperate to appease him. 

Still, most of it barely registered to Izuku. The words sounded like static in his head. 

Katsuki had called him a slut.

Izuku snatched the underwear out of Katsuki’s hand and shoved it as deeply in his pocket as possible. He didn’t want to leave evidence of his shame behind.  As if by taking it back he could take back Katsuki calling him a slut. 

Sobbing, he ran out. 

“So your nan just wanted you to try out the new line to see if they were comfortable and functioned well, but your dad found them in your washing, jumped to conclusions, and had a massive freak out thinking that you were going to become a lingerie model?” Hatsume asked, most of her focus on the tiny circuit board she was soldering. 

Izuku watched her from the safety of her desk across the garage, a mostly empty glass of water in his hands. His tears had finally run dry in his recounting of the fight to Hatsume. He had stolen one of his dad’s cars and driven to her workshop, knowing that his dad wouldn’t know how to find him here. Hatsume knew how much Izuku needed his own space sometimes, especially when Katsuki had the habit of turning up at each of Izuku's friends’ houses demanding he come back when he was gone slightly too long for the somewhat overprotective father to handle.  

“Yeah, pretty much,” he said in response to her conclusion.

She whistled, still soldiering. “Damn, that’s one massive overreaction, even from your dad.”

Izuku shrugged, starting to study some of the blueprints she had pasted to the walls. “You know what he’s like.”

Hatsume hummed in agreement, because everyone knew what Katsuki was like when it came to Izuku. He took doting to a whole new level. “You two are very close, and he’s always been a bit… er, old-school protective over you. Still, he’s got to give you some breathing room eventually, right?”

It was Izuku’s turn to shrug as he examined what looked like the plans for a watch on Hatsume’s wall, if a watch was still a watch when it contained a bomb. What the fuck was she building this time? “I dunno. He grew up in a different age. And omegas are so rare, he can’t help but be protective. And I think… I think he’s just a bit paranoid because I’m around the age he was when Ochako…”

He trailed off, exchanging a significant look with Hatsume. It was common knowledge that Uraraka  Ochako had baby trapped Katsuki in order to marry into one of the wealthiest families in the city. 

It had been a common tactic with those of the wilder genders. Since the days of their parents’ youth, there had been massive social advances in terms of alphas and omegas in society. Especially since the development of suppressants, scent blockers, and birth control, which allowed the alphas and omega to more easily repress their more animalistic instincts during day-to-day life, as well as during heat and rut. Their development had led to a massive shift in societal rules that governed what was and wasn’t appropriate.

Not that they were mandatory. Historically, alphas and omegas were relatively rare but revered within society, and often elevated to a level that allowed them to act as they would wish in terms of their instinctual behaviour. And, as many sociologists pointed out, alphas dominated in leadership roles and so made up the majority of government and big business, which meant that society was tailored to fit them.

However, there were still limits. When Izuku had been very young, there had still been very stringent rules for alphas and omegas to prevent a population crisis, and knocking someone up was grounds for marriage. A rule that had been heavily enforced. In these modern times where wilder displays were not visible in public, it was hard to imagine the life that was described to them by their parents and teachers during sociology. 

“Well, whatever,” Hatsume said, tired of discussing things that weren’t electronically operated. She finished soldiering her circuit board, and carefully inserted it into the watch Izuku had just been looking at the blueprints for. “Talking of a different age, do you want to see my newest baby? It’s my greatest masterpiece yet.”

“What is it?”

“It’s a time-travelling device.” She looked at Izuku with great fervency, a manic glint in her eyes. “How would you like to see that different age your father was raised in? Maybe it will help you understand why he’s acting the way he is.”

Izuku and Hatsume took the watch to the highstreet, to a secluded spot behind the city library that they knew had always been clear – even in the past. 

“Just remember, don’t interfere or change even the smallest thing. You don’t know what effect it will have in the future.” Hatsume fixed the watch to his wrist and showed him how to input the date to the same day and month, just eighteen years ago. Izuku changed the month to the end of summer a few months earlier, not wanting to walk around town in winter in only his t-shirt and shorts. He hadn’t grabbed a jacket before leaving and he was cold. "And here-” she handed him a picture of his class “- check this before you come back to make sure you haven’t made any super massive changes. If you erase me from existence I’m gonna be so fucking pissed.”

“I’ll try my best.”

“You better. This baby only has enough power for two charges. One to get you there and one to get back, so go there, look around, and come back to right here and now. It will automatically bring you back after 30 days, just in case, but you shouldn’t stay there for that long. In fact-” she got out her bag and quickly ripped off a corner of a notebook page. She wrote down the exact date and the time for about five minutes in the future and shoved it in his pocket. “Just in case. I know what your memory is like sometimes.”

“Got it.”

“Break a leg, but don’t break time, my dearest guinea pig,” she warned. 

Izuku didn’t reply, he just pressed the green button to activate the watch, his heart in his throat.

As expected, he opened his eyes to the exact same corner of the library. Only, Hatsume was no longer in front of him and the air was much warmer with the summer sun.

It had worked. 

Wow, Mei really is a genius. She’d just nonchalantly invented time-travel in her garage. 

He hesitantly wandered down to the main highstreet, cautiously boggling at all the differences, as well as the similarities. The different clothing people were wearing and the hairstyles. The different shops and cars. He got some weird looks as he went past in his relatively short shorts and t-shirt; while it wasn’t completely alien looking, his clothes definitely did not fit in.

Izuku didn’t care though. He was just a stranger passing by, they’d all forget about him momentarily and he’d be safe to go home. It was just so fascinating. He had to forcibly hold in the urge to start muttering. 

Even the air smelled different in the past. It was only when he got closer to some more densely packed areas around the shopping district that he realised it was because no-one had their scents blocked. Betas were mild and easy to ignore, but the rare time he encountered another alpha or omega he almost had a rear back in how strongly they smelled. It wasn’t good nor bad, just a scent, he had just never encountered it so strongly from so many strangers. It made him feel weird, instincts bristling in a way he wasn’t used to.

Overwhelmed, he took a moment to orient himself in the mouth of an alleyway. Tucked just inside the corner so he wouldn’t get in anyone’s way, he took a moment to breathe and people-watch everyone who went by. 

Then he heard the sounds of a scuffle around the corner further down the alleyway.

“Get off of me!” A vaguely familiar female voice yelled. 

A decidedly unsettling series of laughs rung out. 

Against his better judgement, Izuku crept closer. There really was something familiar about that voice. He peeked around the corner to see three men sounding a woman, all of them decidedly beta. 

“Let me go!” The woman cried again, struggling against the two men that were holding her arms. 

“Only after we get what we want.”

Izuku had heard enough, he crept down the alley and swiftly downed the first man with a chop to the pressure point in his neck. “Let her go,” he warned the other two. “My daddy made sure I’ve been trained to take down alphas during rut if need be. Two betas will be child's play.”

The two men looked at each other and then back at Izuku, sniffing. A glint of confusion entered their eyes when they weren’t able to detect a hint of Izuku’s scent. Izuku had never been more thankful for blockers. 

“Ha!” One of the men chuckled. “Like you can stop us. Your scent is so faint, you must be a beta, so you can join this one in entertaining us. One each seems much better than sharing.”

“I dunno Kariage, he’s so pretty. I think he must be an omega.”

Kariage let go of the beta woman to approach Izuku. “You’re right, Lido. Even better. I’ll let you have her and I’ll take the little unpresented omega.”

“Huh, but I want the omega,” the other argued, also loosening his grip on the woman. 

She was quick to take advantage. She ripped herself free and bolted down the alleyway, knocking into Izuku as she went. He got one look at her face and his stomach dropped. No wonder her voice was familiar. 

Uraraka Ochako sprinted away, leaving Izuku on the ground as she made her escape. 

“You just lost us our prey!”

“Guess we’ll have to make do with just you.”

Izuku got himself to his feet just in time to dodge out of the way of the first grab. He lashed out with a kick to Kariage’s knee, not quite managing to get enough momentum to it to break it, but it made the beta drop to one knee with a shout of pain. Just in time for Izuku to dance out of the way of Ludo’s attack. Ludo was fast, but not well trained. And Izuku managed to prevent Ludo from pinning him long enough to get a good headshot in and take the second beta down for the count. 

Unfortunately, he had underestimated the distance between him and Kariage, and suddenly staggered as he slammed Izuku heavily into the wall, making his head hit brick in a move that immediately made the world spin. 

“Now it’s just you and me, little omega.”

Izuku smelled his dad before he heard him. 

For one delusional moment, he thought his dad had somehow sensed Izuku was in imminent danger and his sheer rage had pulled him through time to deliver his punishment.

Ludo was whipped away from Izuku, a hand at his throat and a fearsome snarl of enraged alpha rattling the air. “What the fuck do you think you’re doing to him, scum?”

Izuku slowly slid to the floor, vision painful and head spinning too much for him to withstand. 

The last thing he saw before he blacked out were the ever-comforting, smouldering red eyes that he’d known his entire life, open wide in shock and anger. A familiar scowl of protective concern on a too-young face and a smell that made him feel safe. 

“Daddy.”

Even before he was fully conscious, Izuku could smell Katsuki on the soft pillows beneath him. He must be on his bed for it to be this strong. A cold flannel was replaced on his forehead, soothing the red-hot pain there. 

“Daddy?” he whimpered.

“Shh, it’s okay, Deku,” Katsuki crooned. “I’ve got you. You’re safe here.”

“Mmm.” Izuku tossed his head, opening his eyes to a dark room. “I had the weirdest dream. We were fighting, and then I got attacked and you were there even though-”

Even though I was in the past.

Izuku shot up. “Where am I?” he demanded. “Who are you?”

How could someone in the past smell so much like daddy?

The bedside light flicked on and revealed a face that Izuku had only seen in pictures. 

“I’m your saviour,” the teenager with the face of his father said with no small amount of boasting. “Well, you kind of had it in hand, I guess, but that beta played dirty and made you hit your head. I finished him off and took you home. The doctor said you’re fine, no concussion, just a nasty scrape and a bit of disorientation. You were lucky, Deku.”

What the fuck?

Izuku didn’t say anything, but that hardly seemed to deter Katsuki. He sat down next to Izuku’s hip on the bed and crowded forward, an intensity to him that Izuku was so used to that it didn’t even strike him as strange. But there was something strange about his scent, it was stronger than normal. “Where did you learn to fight like that? It was so ho-” he blushed, and Izuku boggled at the sight, forgetting all about Katsuki’s weird scent. “I mean, it was really impressive. You’re strong for an omega, Deku.”

Then, when Izuku continued to just gape at him, Katsuki brushed his fingers over his forehead. “Deku, why aren’t you saying anything? Are you in pain? Should I call the doctor again?”

Izuku had so many questions. 

And yet all that came out was, “Why do you keep calling me Deku?”

Katsuki suddenly looked bashful. Well, as bashful as a 6 ft 2 alpha with no concept of personal space can do. “Well, that’s your name, right? Daibaku Deku. It's on the label of your underwear.” He pulled at the duvet as if to show Izuku his own underwear, but seemed to think better of it when Izuku just clutched it to himself tighter. “That's a bitchin' surname.”

Izuku had war flashbacks of the fight he’d just had with his present day father. Apparently, checking people’s underwear, no matter the relation to him, was just the sort of thing that Katsuki did. What a freak.

“It’s pronounced as Izuku, not Deku,” he corrected without thinking, his thoughts whirring too fast to keep up with. He found it very ironic that his father couldn’t correctly read the kanji of the name that Katsuki himself had given him. And Daibaku was the name of his family’s fashion house. Still, it wasn’t like he could say his real surname.

It hit Izuku that he was in the past. He was actually in the past, interacting with the – he did the maths in his head – seventeen-year-old version of his dad.

A dad that was crowding into his space once again. “I think I like Deku for you. You don’t mind me sitting here, do you? You’ve been awfully quiet…”

“I’m okay!” Izuku said, trying to push Katsuki back from where he had been practically hovering over his prone form. He scrambled off the bed, anything to get away from Katsuki and his scent that was making his head spin faster than any injury. “Why were you looking at my underwear anyway?!” he tugged himself free of the covers, only to discover he was only wearing said underwear. “Where’s my clothes?!”

“Relax, I had to clean you up from all the grime in the alleyway, and my old-hag is washing your clothes.” He perked up. “You can wear some of mine until they’re dry.” He got up to get some clothes out of his wardrobe. Izuku finally looked around to see that they were in his father’s old room in his grandparents’ house, only much more lived in and less stale-smelling than Izuku was used to; it practically reeked of Katsuki. 

“KATSUKI!” A voice yelled from downstairs. It was Mitsuki, Izuku recognised his grandmother’s voice. “DINNER’S READY. GO KNOCK ON OUR GUEST’S DOOR TO SEE IF HE’S WOKEN UP!”

Katsuki opened the bedroom door. “BE QUIET. HE’S RESTING FROM HEAD-TRAUMA, HE DOESN’T NEED YOU MAKING IT WORSE!”

“I’LL COME UP THERE AND SHOW YOU HEAD-TRAUMA IF YOU’RE NOT QUICK!”

“I’M COMING, CALM YOURSELF, HAG.”

Katsuki came bustling back in, grabbed some clothes from the wardrobe, and carried them to Izuku. “C’mon, the hag isn’t the most patient and she can’t see me in here.” 

“What, why?”

“No reason. Here, let me help you up.”

Despite his urgency for speed, Katsuki had no qualms about delaying them by insisting he help Izuku dress. Far too used to what his father was like when Izuku was ill or injured, Izuku only raised the minimal amount of fuss in protest. 

It was only when Katsuki was fussing with the shirt collar around Izuku’s neck, fingers accidentally brushing against his scent glands, that Izuku realised he was no longer wearing his scent patches. He hadn’t realised before, too used to not wearing blockers around family. He slapped his hands over his neck and questioned whether to bring them up. They were definitely not something from the current time and he didn’t want to raise suspicion. 

Katsuki seemed to guess what he was thinking anyway. “Curious things, those patches. Did your alpha get them for you?”

“... Yes.” It wasn’t a lie. 

Katsuki nodded as if this were expected, taking Izuku’s wrist, hand tight and just barely brushing the glands there as he pulled him out of the room and to the stairs. “I’ve never seen anything like it, it nearly completely doused your scent, I could only faintly smell you. What a loss that would have been. Your alpha must be very restr- protective. I’ve never heard of an omega trying to hide who they are.”

Izuku didn’t know how to respond. “He is very protective.” He settled on just agreeing with facts. 

“Unfortunately, they got a bit ripped up when I was taking them off. I don’t think they’ll work anymore.”

"Why were you taking them– never mind." Izuku sighed, disappointed. He cringed to imagine going through life without blockers in public. But it was fine, Izuku would be going back to the present as soon as he could get out of this house anyway, there was no point making a fuss. “That’s fine. Thank you for looking after me and making sure I’m okay.” he suddenly stopped in the middle of the hallway. “Who are you, by the way? Where am I?”

Izuku was not cut out for this time-travelling malarky. How was he supposed to act when he was so used to being comfortable in this home and with this person? He hoped Katsuki hadn’t picked up anything weird. 

He told himself just to act as if he was in a stranger's house. His Nana had made sure he knew how to be polite. He just had to make sure to be as formal as possible, treat Katsuki like a stranger and leave quickly. 

But Katsuki wasn't a stranger, he was the person closest to Izuku and always had been. There was no way Izuku would be able to keep himself distant from Katsuki, as if he were a real stranger; so, he had to get out of here as soon as possible 

“Bakugou Katsuki, and we’re in my parents’ house on XXX Road.”

Treat him like a stranger. 

Izuku distangled his wrist from Katsuki’s hold, unsure why Katsuki had maintained it. It would have sufficed to ask Izuku to follow him. 

“It’s very nice to meet you. Thank you again for tending to my injury while I was unconscious. Please can I go to the restroom before dinner? I’d like to wash my hands.”

A strange look flitted across Katsuki’s face. He stared down at where Izuku had taken away his wrist. “Huh.” He shook his head and looked at Izuku, eyes fervent. “What kind of alpha would I be if I didn’t look after such an adorable omega like you? Taking down that beta and looking after you is easy for me.”

Izuku was bemused. The Katsuki he knew had barely any regard for omegas. They were just like everyone else for him, and, to Katsuki, everyone else apart from his pack was just an extra and therefore insignificant. Maybe he was different when he was younger and was more eager to prove himself as an alpha.

“The restroom, please?” Izuku threw in a smile, going for reservedly polite. He knew that the restroom on the ground floor only had a small window, but he had used it to sneak out before and he knew he could do it again. 

“Sure, just through here.” Katsuki led him to the correct room. “I’ll be just down the hall when you’re done.”

“Thanks.” Izuku threw in another slightly unhinged smile and practically slammed the door in Katsuki’s face. 

“I’ve got to get out of here. This is just too trippy,” he mumbled to himself. 

He’d use the watch right here and now but he wasn’t sure if he’d return to someone else being in the room with him. He couldn’t take that risk. 

He got the window open and was halfway through, when, for some reason, he was reminded of Hatsume’s warning. “I should check the photo. Just in case.”

The photo was fine. Everything was as it was. Apart from–

“Wait, why am I missing?” 

But that wasn’t quite right either. In the space between Shouto and Iida, where he should’ve been, was a faded version of himself. Like Izuku was being rubbed out of the photo.

“What? How could I have erased myself from existence in less than three hours?”

There was a knock on the door. “Deku, are you alright?”

Fuck. How could Izuku reply to that? Not really, dad. I’ve somehow managed to break time in the few hours I’ve been in the past, half of which I’ve been unconscious for.

He sat on the toilet, forehead braced on one hand while he stared at the picture. He seriously contemplated just bursting into tears. Instead, somewhat high-pitched, he said, “I’m fine. I just need a moment.”

“Alright, but be quick. The banshee is starting to wail.”

Katsuki was damned lucky that Izuku knew he was talking about Mitsuki, otherwise he’d be so fucking confused right now. Was this how his dad talked to strangers? How was he so successful in life with social skills like that?

Focus, Izuku! What could he have done to erase his own existence? It had to have been something he’d done in the alleyway, seeing as both of his parents had been there. But how did Izuku beating up those thugs prevent his own birth?

He reviewed what he knew about how his parents met. They’d been in the same classes and Ochako had a desperate crush on dad. Then, one day, they ran into each other when Ochako was attacked… Oh god, Izuku was an idiot. 

His parents had met when Ochako had been attacked by three thugs in an alleyway, and dad had saved her from being raped. Katsuki had made sure the thugs were apprehended and that she was treated at the local private hospital, and she had fallen in love with him (and his easy use of money). Eventually, to make her feel better about the wounds she’d gotten during the attack, he’d agreed to accompany her to the summer prom held at the school. During the course of the evening, Katsuki had gotten drunk, they’d gotten together, and accidentally (or not, as the rumours go) created Izuku out of matelock. Eventually Mitsuki found out and forced Katsuki to marry Ochako. 

And Izuku had just gone and absolutely bollocksed that up. 

Katsuki hadn’t saved Ochako, he’d saved Izuku. Instead of taking her to the hospital and making sure she was looked after, he’d taken Izuku home and tended to his wounds. Ochako and Katsuki hadn’t even spoken and, as a result, Izuku would not be conceived.

Fuck. Izuku crumpled to bury his aching head in his hands. 

One thing was clear; Izuku couldn’t leave just yet. He had to fix his mistake first. 

And that meant he had to somehow get through a dinner with his closest family members while acting as if they were strangers. Wonderful. 

Katsuki offered his arm when Izuku finally emerged from the bathroom. Izuku looked at it, then looked at Katsuki. He thought, On god, I’m gonna get you laid, daddy, and then took a moment to seriously contemplate how his life had come to this.

He took the arm, bracing himself to face his grandparents. 

Izuku walked into the dining room, chanting to himself 'this is not your home. You are a guest. Act like Nana has taught you to act in a host's house. This is not HOME.’

Standing behind their seats for dinner were the younger versions of his grandparents. And while Masaru looked much more youthful, it struck Izuku that neither Katsuki nor Mitsuki looked like they’d aged much. Instead, their faces were simply more mature in the future. Izuku begged the universe that he inherited those genes. 

He looked at Mitsuki and the urge to rush to her for a hug almost overwhelmed him. She’s always been who he goes to when he needs help and boy did he need help right now. 

“Deku, these are my parents. Bakugou Masaru and Mitsuki.” Katsuki indicated to Izuku. “Old man, Hag, meet Deku.”

“It’s actually Izuku.” Against his every habit, Izuku forced himself to bow politely to both, before shaking Masaru’s hand and allowing Mitsuki to kiss his jaw, respectively. Doing so allowed both to scent him on his wrist and neck as was polite. His Nana hadn’t drilled manners in him for nothing; he managed both with an unwavering smile and a demure, “It’s a pleasure to meet you. Thank you for looking after me.”

Masaru smiled congenially back, always the more sedate of his grandparents. “You’re most welcome.”

Mitsuki, somewhat more guarded of the two, waved him off to take the seat next to Katsuki. “Let’s sit down and start eating before the food goes cold.”

Ah, the cold shoulder hurt more than he expected. Mitsuki had always doted on him, almost as much as Katsuki, and Izuku floundered in the face of her casual disregard. 

Before Izuku could pull out his chair, Katsuki was already doing it for him. 

“Thank you,” Izuku said quietly and only sat once Mitsuki had taken her seat, acknowledging her place as the omega highest in the hierarchy of the room. Next to him, Katsuki did the same with Masaru, an action Izuku had never seen him do before. Katsuki had long since become the lead alpha of their family unit in the future. 

“Thank you for your patience as I got ready for dinner.” Izuku said. “I was still feeling a bit woozy after waking up and had to sit down for a few minutes.” 

“Take all the time you need. I should have realised you’d still be dizzy after a bump to the head like that. How are you feeling now?” Mitsuki asked.

“It’s much better now. Thank you for getting the doctor for me, it was very thoughtful of you.” 

“It probably wasn’t necessary, but we wanted to make sure. It was a dreadful thing that happened. We’re just glad that Katsuki managed to find you before something worse happened.” At the reminder of the fight, Izuku paled. He still couldn’t believe that he had prevented his own birth. 

Mitsuki mistook his sudden downturn for fear over the fight and cooed. Even she looked quite shocked at her own softness, a shock reflected by Katsuki and Masaru. Nevertheless, she quickly got over it. “You poor dear. Don’t worry, we’ve made sure those thugs will be locked up for a long time. Attacking an omega comes with a jail sentence.”

Masaru started loading a plate up with food and settled it in front of Mitsuki, before starting to load his own. “A very strong one. We’ve already had words with the police officer in charge and he’s going to expedite the process to make sure they’re off the streets. But I’m sure your pack must be very worried about you. Do you need to use our phone to make a call?” Masaru asked.

Izuku came to another sudden realisation. 

There were no mobile phones during this time. 

He suddenly felt very faint again. 

“Deku, are you alright?” Katsuki asked, laying a hand on Izuku’s shoulder and leaning in, subtly sniffing him as if attempting to pick up where he might be hurt. When had he gotten so close?

Izuku nodded and leaned away. His dad had been acting more remote recently so it was almost weird having Katsuki in his personal space again. “I’m fine. I just–”

He had no pack in this time and therefore no one would be looking for him, but he couldn’t just say that. Everyone had a pack, especially omegas. 

“They’re out of town at the moment and I don’t want to bother them.” He cast his mind around for what the Bakugous would think was a suitable reason not to disturb his parents. “They’re in the middle of a business merger.”

Izuku was surprised when a heavily loaded plate was settled in front of him. By the time he had turned to look where it had come from, Katsuki had turned away and was already addressing his parents. “Deku should stay with us while they’re away.”

“Ah, no–” Izuku was about to protest that it wasn’t necessary, before realising that it actually kind of was. There was nowhere else he could go in the time it took him to fix his mistake and he had no money for a hotel. Not any that was in circulation, anyway. Plus, staying in near proximity to Katsuki was Izuku's best bet for being able to fix his mistake. If he befriended Katsuki then maybe he could encourage him and Ochako together and fix the timeline.

Even if he had protested he thinks Mitsuki would have still bulldozed right over him. “Katsuki might be right. I think you should stay. I think you're our responsibility, Deku. I couldn’t bear to send you back to an empty house after being attacked. Omegas shouldn’t be left unprotected.”

He knew that was as good as the issue sorted. If Mitsuki said something was her responsibility, there was no changing her mind. 

“He can stay in my room,” Katsuki volunteered quickly.

“Nonsense, an unmated alpha and omega can't stay in the same room. Besides, we have plenty of space. I'll ask the maid to make up one of the spare bedrooms.”

That was one thing that hadn’t changed. Despite Mitsuki not having created her fashion empire just yet, the Bakugous were old money and their giant mansion house, staffed by a small army of employees, reflected that. Masaru had some sort of business that did well and had been passed down the Bakugou family for generations. Even in the future, Izuku had only the vaguest idea of what he and Katsuki actually did. 

“Thank you for the offer. Please look after me for a while longer.” Izuku said, bowing his head. 

“You’re welcome to stay as long as needed,” Masaru said. His gaze flickered to Katsuki for a second before returning to Izuku with a smile. “We’re more than happy to have you.”

Now that everyone had food in front of them, Mitsuki and Masaru picked up their cutlery. Izuku was very careful to make sure he only started eating after they had both taken bites of their food. 

“Thank you for the food,” Izuku said to Mitsuki. “It’s delicious.”

“Thank you, dear.” For a few minutes, the only sounds were of them eating, and then, just when Izuku thought he might be safe, Mitsuki asked, “I’ve been wracking my brain: have I met your sire, Izuku? You look familiar.”

“Ah… Maybe?” Izuku glanced at Katsuki out of the corner of his eyes and held in the urge to wince. “I’m not sure. I hear that a lot though. I just have one of those faces.”

Next to him, Katsuki snorted. “Yeah right. I've never seen anyone who looks like you.”

At the head of the table, Masaru nodded. “You have a very distinct appearance and scent. Very visually stunning. I’m sure it’s hard to mix you up.”

“Agreed. You’re quite beautiful, and your proportions are…” Mitsuki paused, contemplating her words. 

Katsuki didn’t have the same reservations. “Ungodly,” he muttered under his breath. Izuku didn’t hear, but Mitsuki certainly did.

“Very proportional,” she finished, slightly louder and with a reprimanding look to her son. “Your pack must have a hard time keeping the alphas away from you.” Mitsuki squinted for a moment and then huffed as if giving up. “Ah, I really must not know you then. I’m sure I would have remembered someone who looked like you.”

Meanwhile, Izuku was basking in the praise. He had never blushed so hard, but he felt quite touched. His family often and eagerly told him that he was beautiful, of course; in fact, Mitsuki had demanded that she be allowed to make Izuku the face of their childrens’ line since he was old enough to smile gummily at a camera (a childrens’ line she’d created for him; no grandchild of hers was going to wear off-the-rack). But he had never known how much of it was true and how much of it was their, often overwhelming, love for him. He was pleased that even as a stranger they thought the same. 

Still, he was starting to see where Katsuki got his social skills from. Was it normal to discuss someone's body when they came for dinner? Has Izuku’s family always been like this?

“Ah, thank you.” Izuku scratched his cheek, hoping his blush would dim soon. He was feeling really quite hot. “You’re a beautiful family, too, and very kind.”

Masaru smiled in that gentle way he had. “Thank you, that’s very sweet.”

“And not something we hear about our son often.” Mitsuki gestured to Katsuki with a devilish look in her eye. “Do you think he’s beautiful too? I’ve always thought he was a perfect-looking alpha myself. Strong and handsome, wouldn’t you agree?” 

Izuku thought Katsuki might try and shout Mitsuki down, he was always so embarrassed at her boasting about her son. Instead of telling her to curb her pride though, he leaned forward to hear the answer, once again breaching Izuku’s space and looking strangely intent.

Izuku caught Katsuki’s eyes and blushed, if possible, harder. “Yes, he’s-” Izuku swallowed his nerves– “the perfect alpha.”

It was the objective truth. His dad was the most good-looking person Izuku had ever met. He’d always thought so.

Katsuki's pupils dilated so wide Izuku almost thought he could see himself trapped in the prison of their void-like depths. Then he blinked and the feeling was gone. 

He thought he heard Katsuki purr for a second. He coughed quickly and Izuku presumed he’d misheard. Still, Katsuki looked very pleased and Izuku was happy to see it. His dad was so cute when he was young.

“Well, if we’re to have you, where can we pick up your stuff? We’ll drive you to your parents’ house to get you enough to last for a few weeks. Or were you in a hotel? I can send someone around to get your belongings-”

Izuku didn’t want to have to interrupt her, but he couldn’t let her go on. He had nothing with him apart from his clothes and he cast around for a lie that would make that not seem strange. “Er… I’m afraid I don’t have anything with me. It, erm, well, it… got lost.”

“Got lost?”

“Yeah.” Izuku had a eureka moment. “On the flight. All my suitcases got misdirected and they’re currently in… erm, Kazakhstan.” he mentally facepalmed. Why was that the only country that came to mind? “So, yeah, I don’t have anything with me at all. And I think I dropped my wallet when I got attacked.” He laughed nervously and concluded, “Yep, I’ve got nothing.”

He watched them all, sweating and expecting them all to call him out on his bullshit. That had been the most unconvincing lie he’d ever heard. He’d at least have his passport and travel essentials, but he’d hope they’d all forget about that.

“Oh you poor thing,” Masaru said, pity discernable across his features. “Look at you shaking, you’re so scared. It must be terrifying to be in a strange new city with nothing and no-where to stay. It's so lucky our Katsuki found you and brought you home when he did.”

“And your parents won’t even come back from their trip to look after you.” Mitsuki frowned in the way that Izuku knew meant she wanted to say something but didn’t think it was appropriate. Probably about how lousy his supposed ‘parents’ were. 

“They’re very busy, and it’s a super important deal,” he weakly tried to defend them. Mitsuki and Masaru exchanged a very obvious look that spoke to their doubt. 

Izuku barely managed to stop his jaw dropping. He was actually getting away with this. 

Mitsuki reached across the table to pat Izuku’s hand. “Don’t worry about a thing. While you’re under our roof it’s our responsibility to provide for you. We’ll look after you, won't we, Katsuki?”

Izuku jumped when Katsuki’s hand landed on his thigh. “I’ll – we’ll make sure to provide you everything you need. It will be my- our pleasure.” He emphasised his point with a firm squeeze, and it made Izuku’s squirm, warm under the collar. “You’ll want for nothing, I'll satisfy your every desire.”

Katsuki did not remove his hand. 

If Izuku was not used to his family always going the extra mile and being extraordinarily generous when it came to him, he may have been a bit more hesitant about their intentions, let alone accepting. As it was, he couldn’t fathom a world where his family didn’t try and give him everything he could ever want when he needed it, so this slipped right off his radar. 

He forgot, for a second, that he was a stranger and therefore it was a bit suspect for another pack to be offering this to a lone omega in need. 

(Izuku had never been the target for poaching before. He’d heard of it, of course, of packs proving they could provide. Of enticing a potential member with better food, a better home, and better things. It was most often a subtle courting, trying not to alarm the potential pack member.)

(With their rarity, omegas were especially targeted, but his pack in the present time would have never allowed anyone to even think of approaching with the intent to take Izuku away from them. He just did not know the signs. Especially considering most packs sent one potential mate to entice the omega into joining. In his present, Katsuki would never let another alpha even think about it. Besides, who could Izuku mate with here? Only Katsuki, his father, was the right age.)

Izuku ducked his head, so grateful that his family always had his back. “Thank you. I’ll be in your care.” 

Over his head, unseen by Izuku, their eyes gleamed with satisfaction. Katsuki especially, never took his eyes off Izuku for a second. 

He only glanced away when the force of Mitsuki’s look compelled him to turn to her. Her eyes locked with Katsuki’s from across the table, even as she replied to Izuku. “We’re happy to have you. In fact, any pack would be lucky to have you,” she said, very pointedly. 

If you’re going to court this omega, do it quickly before his shitty pack comes back and causes problems, or before someone else gets the same idea, her eyes said.

Katsuki huffed. Of course, who do you take me for? He was mine the moment I laid eyes on him.

“They would,” he agreed to both Mitsuki’s words and her hidden intentions. “I’m sure they’d do anything to keep you.”

Masaru, wisely deciding to stay out of his wife and son’s meddling, simply said, “It seems to me the first thing we’ll need to get you are some clothes. You can’t wear Katsuki’s forever.”

Katsuki whipped his head around to stare at his father, betrayed. "Ha?! Why not?"

Mitsuki, meanwhile, practically jumped out of her seat. “I’ll call Amanda immediately! We’ll go to her boutique tomorrow. She has just the most darling clothes for omegas. I’ve always wanted an omega I could dress up, but instead I got him. ” She gestured dismissively to her alpha son that Izuku knew, for a fact, that she had doted on for the entirety of his life and would continue to do so into adulthood. 

However, he also knew that she really had always wanted an omega child to play doll with; she’d gotten her wish when Izuku had been born. But this Mitsuki had never gotten to experience that. 

“It always feels great to watch everyone be unable to look away from the person I dressed,” she continued to gush. Eyes slight with a concerning amount of fire.

He already knew this was going to be an ordeal, but he pasted a smile on anyway. If it made her happy, he would play along to her wishes. “I’m looking forward to it.”

Chapter Text

“Nope, that’s not right at all,” Katsuki said to what felt like the hundredth outfit Izuku had modelled.

“Why are you here again?” Izuku couldn’t help but whine. 

Katsuki just smirked. “To make sure you end up wearing something appropriate.” Izuku had a moment of such intense overlap with his father in the future that it made him sway. “The hag will try and put you in something far too traditional. But you’re much more suited for something a little more… sexy.” 

“Huh?” Izuku thought he must have heard wrong. “Sexy?”

But they were interrupted by hurricane Mitsuki before he could answer. 

“Brats!” She said with the same intonation someone might sing ‘darlings!’. “Look at what I’ve found!” she held up her discovery with a flourish. 

“That’s- that’s a corset.” Izuku felt like he might faint. 

“Hell yeah it is,” Katsuki said, eyes gleaming strangely. “Can you imagine what your tits would look like in that? Your waist? It would be even smaller.” He groaned lavaciously. "Maybe old-fashioned isn't as bad as I thought."

That was something else Izuku had learnt about this younger version of his father. He was much more crude. 

“I’m not wearing a corset.” 

“But, what about if you need to go to a formal event?” Mitsuki protested. 

“Is there such an event I might possibly attend in the next few weeks?” Izuku deadpanned. 

“Well-”

“No. It’s not practical. I'm not used to one, so it would restrict my movement and ability to breathe. I'll barely be able to get up the stairs without being out of breath.” Okay, yes, Izuku was exaggerating the slightest bit, but needs must. Mitsuki wasn't the type to listen to normal logic. 

“Absolutely not.” Katsuki quickly got on board. “If it’s going to hinder his ability to… exercise. He needs to be able to bounce around, at least. Besides, he doesn’t need one, hag. Nor a waist cincher - have you looked at his figure?”

“What about a girdle?” 

Izuku glared and shook his head resolutely, even as Katsuki’s eyes lit up and started nodding.

She sighed and moved on. “Fine, here’s some skirts and blouses for you to try.”

Unlike in the future where trousers were much more common, omegas in the past all wore dresses or skirts. Mitsuki insisted that they be knee length or lower, and in opposition Katsuki was attempting to advocate for a shorter length, citing that that’s what the omegas at school wore. 

It was an ongoing fight and it was why they had all been there for so long. Everything Mitsuki chose Katsuki dismissed as out of fashion, and everything Katsuki liked, Mitsuki dismissed as inappropriate. To be honest, Izuku didn’t think the looks Mitsuki was choosing were that bad; it was what he expected the looks from the time to be from what he remembered. Katsuki just liked to be contrary and rile his mother up. But they were driving each other and everyone around them mad, Izuku included. 

Finally, Mitsuki snapped. “Katsuki, leave. I know for a fact that everything I’ve put him in has been up-to-date in omega fashion. This is literally my passion in life. Maybe the beta floozies at your school wear something different, but this is what an omega under my roof will wear. So fuck off.”

“You’re so boring, hag. He’s going to look stupid.”

She drew herself up to her full height. “By the time I’m done with him, no one will be able to keep their eyes off him.”

"They'll do that no matter what you dress him in."

"Then it's not a problem, is it?"

Katsuki sneered, but Mitsuki started making moves like she was going to start pinching his cheeks and pulling and he reluctantly slouched off. The attendants and who had been helping them all morning sighed with relief. 

When Katsuki left, she turned to Izuku with fire in her eyes. “I’ll show him boring and old-fashioned – I’ll fucking kill him. I’m going to make him swallow his tongue when he sees you. He has no sense of trends, that one. I still buy his clothes. Where does he get off telling me what is and isn’t in fashion?”

Together, they did eventually find some clothes that both of them liked on Izuku. He even managed to get her to let him try on a pair of alpha’s jeans. She whipped them off a second later, “They do nothing for your hips, darling… But maybe a pair that were tailored for your body would work. Capris for omegas have been coming into fashion, but I don’t think many people here wear them.” She seemed intrigued about the idea of breaking current fashion norms. 

“Now, let's choose some underwear. I saw the pair you’re wearing as you were changing-” she said with a mischievous look.

Izuku blushed, mortified. The thong he’d snatched out of his father’s hand and stuffed in his pocket had smelled so strongly of detergent and scent neutralisers that he’d concluded that Katsuki must have at least washed them before he’d started accusing Izuku of being a whore. They had been the only clean pair he had when he’d been changing this morning. He’d had no choice but to wear them.

“Don’t get me wrong, I don’t judge at all. Omegas should wear beautiful things and they’re very elegant,” Mitsuki assured in response to his embarrassment. “Very unique. Who is the designer? Their work is incredible.”

Fuck. “My Nana made them for me.” 

“Your grandma? Well, she's very talented. I’d love to talk to her when she comes back and learn from her.”

“I’m, er, sure she’d like that too.”

Again, this time-travel bullshit is just too trippy. Of course Mitsuki was appreciative of her own designs. 

“I’m not sure they’ll have anything of the same quality, but I’m sure we can find you some that you’ll like for the next few weeks. And bras - or actually, don’t take this the wrong way darling, I think maybe bralettes would be better for you. And socks! You’ll need some stockings to go with some of these skirts. And-”

And she was off. 

Izuku prayed for strength. 

Mitsuki convinced Izuku to wear one of his new outfits home, citing that his current clothes were, “I’m sure very fashionable at home – where did you say you came from again? – but I don’t think people here have such a liberal view of what omegas should wear.”

Mostly just to get away from her question, Izuku ducked back into the changing room to get dressed. 

True to Mitsuki’s words, Katsuki’s jaw dropped when they arrived home. Just for a second, the next he was all up in Izuku’s personal space, tugging at the hem of the v-neck silk blouse tucked into a high-waisted skirt that dipped to a couple inches above Izuku’s knees. He looked kind of like an old-fashioned house-wife, the kind that was kept barefoot and pregnant by their alpha. Izuku felt a little self-conscious in it, still unused to this style of clothing and how it fit on his body, but Katsuki didn’t mock the outfit like he’d been expecting.

“Good job, hag. He looks… decent.”

Mitsuki puffed up with pride. “He looks delicious, thank you. The most beautiful omega in town.” 

Izuku blushed and fiddled with the hem of his skirt with embarrassment and Katsuki just hummed in agreement. His eyes traced the v-neck of Izuku’s blouse, and the pronounced dip in his waist where the skirt started. His hands fit to the curve, encompassing them entirely. “Fuck, it's gonna be such a hassle keeping the other alphas away from you at school tomorrow.” 

“School?” Izuku asked with trepidation, completely disregarding Katsuki’s hands on him with his sudden nerves. 

“Yep, dad pulled some strings with the headmaster and got you enrolled. You start tomorrow.”

Izuku gasped when he was suddenly pushed against the wall. He hadn’t realised he’d backed into it in response to Katsuki’s domineering presence and it came into focus now. Katsuki’s body practically blocked out the entirety of the entrance hall light with its broadness as he bracketed Izuku against the wall, hands on his hips and nose just a few inches from Izuku’s neck, breathing him in. 

Izuku looked around frantically: Mitsuki was nowhere to be found. 

What?

“Da- Kacchan, what are you doing?”

“Kacchan, huh? What a cute little nickname, Deku.” Katsuki’s hands slid just a little bit further back, more towards Izuku’s ass, and used it to pull Izuku flush to him. Izuku blushed with what felt like his entire body, internal temperature going haywire at the proximity. “You know, you smell unclaimed and you don’t have any pack signifiers. That will be a problem for you tomorrow at school, you realise? I wasn’t joking when I said it will be a hassle keeping the other alphas away from you.”

“Keep the other alphas away from me?” If Izuku’s brain wasn’t flatlining, he would be mortified by how breathy his voice was.

“Mmm, don’t worry, I’ll fuck them up if they bother you.” Katsuki promised with a terrifying glint of unhinged violence in his eyes before they fogged back over with another deep inhale of Izuku’s neck, so deep it was like Katsuki was savouring it. “It’ll help if you smell like mine though. You’ll let me scent you, right? It’s for your own protection, baby.”

Alarms blazed in Izuku’s head. It was like he couldn’t think past Katsuki against him, the alpha’s scent encasing him like a fine mist that encouraged heat and swirling pleasure to come. It drugged him, turned his thoughts slow and syrupy, even as his body thrummed like a live wire. Izuku had smelt this from Katsuki before, but never for this long and from so close. His daddy unusually left before he could smell more than a little, much to his distress. And yet, it’s like his body knows exactly how to respond to it.

Katsuki’s base scent was familiar to Izuku’s omega. He recognised it as his alpha and trusted Katsuki to keep him safe. So, despite the screaming confusion in his own mind, he found his head tilted, baring his neck in submission as every instinct in his body told him his alpha wanted. 

“Good boy,” Katsuki praised and Izuku melted, reminded of his actual daddy whenever Izuku had done something to impress him. 

Katsuki didn’t wait any longer. With Izuku’s neck bared he took the chance to nuzzle against it, spreading his claiming pheromones in a marker that would take days to fade. His hands squeezed Izuku’s ass, pulling him even closer so he could feel the heat of Izuku’s core against his half-hard cock, and groaned at the anticipation of all the things he was going to do to this omega. The skirt was in the way, but he couldn’t divest the brain cells to move it away, too busy luxuriating in Izuku’s scent and the way it robbed him from any thoughts but to claim and breed. 

Soon, he thought. Just a little more courting and he’ll be ripe for me. 

It was true. The omega could keep his distance and act as uninterested as he liked, Katsuki had seen the looks the omega had been sending him from the very moment their eyes met. He knew he hadn’t been imagining it; from this close to Izuku’s glands, the arousal emanated from his pores like heat waves off tarmac on a summer's day. Thick and sweet and oh so tempting. Katsuki wondered how wet the omega was. 

Oh, god, don’t think about that. 

The only reason he held back was the obvious confusion and pheromone drunkenness the omega was experiencing from Katsuki’s sudden flirtation. Once the omega had time to process Katsuki’s designs on him and get with the programme that Katsuki sought to claim him, Katsuki would have no reason to hold back. 

His grin, hidden in the curve of Izuku’s neck, was more than a little feral.

Izuku turning him down never even occurred to him. It wasn’t possible, Katsuki was the best possible alpha in the entire town. He was leagues above everyone in everything: in looks, intelligence, strength, wealth, and domination. Of course Izuku would want him. He had omegas wetting themselves wherever he went, not that he had cared to act on it. None of them were good enough, none of their scents or looks attracted him like Izuku did, with his intelligence and strength Katsuki had seen on that fateful day. With his fuck-me eyes and legs for days and sublime scent. From the second Izuku had entered his senses, Katsuki had known that they were destined. Katsuki would make sure that the omega knew that by the end. 

And if Izuku did refuse, well, some omegas liked to play coy. Katsuki wouldn’t mind a chase — in fact, he thinks he’d quite enjoy it. It would be fun to chase Izuku down and prove to him what a match they made. How well they fit together as alpha and omega in the basest sense. 

With one last lick directly to Izuku’s neck gland, Katsuki drew away and surveyed his work. Izuku looked wrecked; he was breathing heavily, blouse tugged into disarray by Katsuki’s hands, eyes hazy and dilated, neck covered in a thin sheen of Katsuki’s drying oils and saliva and cheeks blazing in his flush. He smelled like Katsuki. Mostly though, he smelled of arousal, both his own and Katsuki’s. Perfection. Almost too good to resist.

But Katsuki was a good alpha. He wasn’t a knot-head like those inferior beings of his gender at school and he would do this in the appropriate steps. He’d leave Izuku be, for now.

Still, he was only human. He couldn’t resist getting a hand in Izuku’s hair to pull his head back into the perfect angle for Katsuki to lean down and finally get his mouth on those perfect lips. Izuku gasped a little, hips bucking against Katsuki’s now fully hard length and he rumbled in response, pressing harder against Izuku’s lips. They felt so good on his. Soft and plump and more than a little addicting. Fumbling, a little, with both of their inexperience; he hoped it was Deku’s first kiss just like it was Katsuki’s. For the sake of the unfortunate bastard who would die if that wasn’t the case, mostly.

He kept it closed mouth – a monumental effort on his part – but it was a little more than the peck he’d been intending. Oh, well. Izuku would forgive him. Judging by the scent of pleasure-lust-want radiating off him, it wasn’t just Katsuki who was into this. 

He should leave before he gets too carried away. His cock throbbed and it was only a matter of time before his baser instincts to claim overwhelmed him with an omega as enticing as Izuku in front of him. 

“Goodnight, Deku. See you tomorrow.”

But hands pulled him back with far more force than he expected. A thrill ran down his spine, imagining Izuku putting him where he wanted him when he got too desperate for Katsuki’s cock. Fucking himself back on it, or putting Katsuki on his back and bouncing with those thighs of his. Katsuki had felt the muscle there; he knew Izuku could do it.

In the present, Izuku’s eyes were wild, the whites of them exposed. "Doesn't this feel… even a little bit strange to you? Unnatural, even. Like there's something in your gut saying you shouldn't do this, not with me." He said with a surprising amount of mental acuity. The way he spoke was almost like he was begging Katsuki to say yes.

"No," Katsuki replied, not even having to think about it. "Nothing has ever felt more natural. More right."

He left Deku behind, slumped against the wall, only taking the image of him panting for Katsuki’s touch to fuel him when he finally got a hand on his aching cock. 

In the safety of his room, wobbly-legged, Izuku collapsed against the floor. "Why?"

Because Katsuki was right; it did feel natural, and that was the most unnatural thing of all. 

"Oh my fucking god, my dad is trying to court me. Aggressively." 

Izuuku was going fucking insane.  

First of all, he didn't sleep well. He was too preoccupied trying to wrap his head around the fact that he had 1) time travelled and accidentally interrupted his parents' first meeting and taken his mother's place in said meeting; 2) subsequently erased himself from existence until such a time that he could unfuck his mistake and get his parents back together, as they should be; 3) was stuck living with his father and grandparents until such a time that he accomplished point 2; 4) the younger version of his father had fallen in lust with Izuku instead of his mother, putting a rather large dent in Izuku's whole 'get my parents back on track and in love/lust (Izuku frankly didn't care which at this point) and give birth to me so I don't implode the timeline and die' plan; 5) his father was making it very clear that he would in fact be courting Izuku with gusto, and Izuku didn't think he'd be able to convince him otherwise; and 6) Izuku … had liked it. 

He'd undeniably liked it when Katsuki had cornered him with the intent of showing him his rather fervent interest, and then some. 

Liked it so much his panties had been drenched by the time he'd gotten back to his room. 

That was his father. 

He couldn't even blame Katsuki. He was innocent in this, he didn't know what he was doing and who Izuku really was. It was evident that Katsuki had developed the same feelings he should have felt for Ochako when he saved her and took her under his protection to get treated. It was practically inevitable for an alpha to fall for someone who they'd needed to protect and then look after as it fed into their dynamic so well. There was even a name for the phenomenon it was so common: the Huntsman effect. 

For Katsuki, he was just confused by his alphas desires, which were probably amplified by the fact that Izuku was an omega in contrast to Ochako's beta; it was a temporary spate of emotion caused by a high-stress event, as evident by the fact that apart from the one time his father had fucked her, Katsuki couldn't stand Ochako and never had been able to. 

It hurt to think that Katsuki might come to think of Izuku in the same way. A mistake. A wobble where the instinctual part of his brain had overwhelmed the higher thinking part. 

And that was the problem! Izuku shouldn't feel disappointed that Katsukis feelings weren't true. He shouldn't like the fact that his father had been grinding up on him and had scented him as his. Not as his son in protection, but as a lover he'd fight others for the right to fuck and mate. 

Izuku shivered, and it wasn't out of fear. 

But, maybe Izuku's feelings were being affected by the same biological condition as Katsuki's were? Yes, of course! He'd been in the same stressful event, he'd been hurt and nearly assaulted, of course his omega was confused and latching onto the alpha that had saved him. He was probably just confused because Katsuki smelled slightly different and it was messing his senses up. 

Katsuki smelled similar enough to his future self to seem like protection and home and submission, yet different enough to also smell like a potential mate. They were both in a vortex of instinctually driven lust and arousal. It all made sense. 

It didn't change the fact that Izuku should know better though. He needed to hold Katsuki off at all costs. Not only because Izuku shouldn't feel this way, but because he needed to use his proximity to Katsuki to get him to ask out Ochako. His first priority is to make sure he was not erased from existence by the time he went back to the future. Simple. 

It was made less simple by Katsuki caging him against the counter as Izuku was washing up his cereal bowl. Katsuki's cock pressed directly between the crease of Izuku's ass as he ground against him, while his arms wrapped around Izuku from behind, trapping him and leaving no wiggle room for escape. The thin material of their pyjamas did little to hide the fact that Katsuki was half hard. 

"Goodmorning, baby. Your ass looks so sexy in those slinky little sleep shorts. I can't wait till it'll be the first thing I see when I open my eyes in the morning." 

It was too early in the morning for Izuku to have to deal with this. Instincts or not, Izuku had never realised his dad was so horny. 

"Kacchan, get off." 

"Oh I will, darling, if you help me out." 

You know what? It really was too early for horny fathers who aren't yet fathers trying to put the moves on their sons. Too early for all of it. Fuck it all. 

Izuku grabbed a knife out of the sink and held it as threateningly as possible to Katsuki's forearm. "Get. Off." 

"Such a feisty omega," Katsuki cooed, the bastard, calling Izuku's bluff and leisurely nuzzling against Izuku’s neck to reinforce his scent mark from last night. Only then did he release him. Izuku hated how much that small sign of domination — of only moving once he'd allowed himself to be moved — affected him. "You're gonna be a firecracker when I finally get you in my bed." Katsuki purred.

That's it. Izuku had to put a stop to this. "Listen, Kacchan. I appreciate you and your parents looking after me and taking me in, but this-" he gestured to him and Katsuki "-isn't going to happen. Ever." 

Izuku could have predicted many reactions from Katsuki. Anger, frustration, entitled screaming, maybe even laughter from Izuku taking it so seriously when it was just a fun game for Katsuki, or angry moping from not getting his way. 

He didn't expect the pussy-melting smirk that Katsuki tossed at him like a live bomb. 

"Oh, but it is. You're an unclaimed omega, away from your pack: no one can protect you from me. My parents trying to poach you has nothing to do with this, apart from the draw of our pack having a very desirable mate all primed for you." Katsuki grinned.

“Your parents are trying to poach me?”

“Yep, funny how you don’t deny the rest. But then, you'd know all about me being desirable, wouldn't you?”

Izuku opened his mouth to deny it, but Katsuki just went on.

“You haven't left yet, despite what happened last night, which must mean that you like it here. Whether it's because of the nest, my parents, or me doesn’t matter. Stay here, don't stay here. Avoid me while you're at home, if you'd like – and if you can. I'll still pursue you even if you leave. You being here just gives me more time and freedom to do things like this-" Katsuki snapped out and pinned Izuku to the floor, too quickly for Izuku to react. He wrenched apart Izuku's thighs so he could settle between them and rub his crotch against the damp heat of Izuku's core. "Oh yeah, you definitely like it alright, omega.”

Izuku couldn’t help it, he moaned at the friction against his folds and clit, at the torrential downpour of Katsuki’s molten scent. In response, Katsuki grinned, wide and unabashed. 

“So get this through your stubborn head. I want you, Daibaku Izuku, terrible-awesome name and all. You're it for me and I will not be deterred by a chase. I'll convince you that this-" he gestured between him and Izuku "- is definitely going to happen. And I always win, so you might as well give in now. Even just this much has you slicking for me, and that frustration will just build, because I assure you I will not be deterred. You'll drop if you keep trying to deny me, I can smell it. You like being under me too much to keep pushing me away and it will havoc your system to deny your omega what you want."

If Izuku was anyone else, he might have done the smart thing and retreated. But Izuku was, at heart, a Bakugou, and just like his father he couldn't let someone else have the last word. 

"Just watch me,” he spat, glaring up at Katsuki through the hair falling over his eyes. “I'll find someone else to fuck the frustration out of me if I have to."

Katsuki snarled. He shoved a hand down his own pants and, before Izuku could even react, brought the same hand up to Izuku's neck, dabbing something wet directly on Izuku’s glands. It smelled so fiercely of Katsuki and arousal that Izuku's thoughts clouded immediately, pussy gushing as Katsuki's pre-cum almost seemed to tingle as it was absorbed into Izuku's glands. "We'll see how you deal with that, Deku. I'll be justified in killing anyone who tries after I've scented you like that." 

"Now, let's get to school before the hag comes in here and tries to redo the courting stages talk." 

Okay, so Izuku hadn’t been doing so well with the whole ‘reject dad’ plan. And, if he’d thought he’d get a respite at school from Katsuki and his desire to turn Izuku into his personal cocksleeve, oh boy was he wrong. 

For one, Katsuki was in every single one of his classes. 

Two, Katsuki seemed personally insulted whenever Izuku tried to ignore him. 

It seemed fine at first. 

Or, maybe more correctly, it started with small things. Katsuki just schooched his chair right up to Izuku’s in class; put his jacket on the back of Izuku’s chair to denote territory and then put an arm around the back; he made Izuku take the inside seat so no one else could sit next to him; kept playing with Izuku’s hair; gave him extra workbooks and shared his books with him; asked him if he needs help - a furrow in his brow when Izuku said no.

There were longer breaks between classes than Izuku was used to. People often came in late near the beginning of class and sat in the free seats at the back, smelling strongly of each other and the teachers didn't even say anything. Izuku would ask Katsuki what they’re doing, but he got so tense through the day that he didn't dare.

Every time the bell rang for the end of the period, Katsuki materialised at Izuku’s side. He'd wait for Izuku to pack his bag, foot tapping impatiently, and then steal it once he was done. Izuku's bag in one hand and Izuku's hand in the other, they'd walk to their next class together. It always took them a ridiculous amount of time. Katsuki would slow down randomly in the hallways, agitation building each time Izuku would look at him questioningly and tug at his hand to walk faster. At first, Izuku thought Katsuki was just trying to escort him to each class. Maybe to make sure he knew where to go; maybe just to prevent any other alphas from approaching Izuku. 

On second thought, it was probably a mix of both. But every time they got to their new classroom, Katsuki looked disappointed. Crushed. And then angry, glaring at Izuku as though he’d done something wrong. The glare then increased in potency when Izuku would try to separate their hands and shift his chair further and further away from the clearly incensed alpha and his appalling lack of blockers, reinforcing the bubble of personal space that Katsuki kept disregarding every time they took their seats. 

Izuku was still trying to wrap his head around Katsuki’s behaviour, and this was not helping things. 

So he started paying attention. He watched where Katsuki would look to try and figure out if something else was pissing him off and Izuku was just being self-conscious in thinking it was something he was doing. He couldn’t feel bad about it though, it seemed everything Izuku did was something Katsuki had to know about and involved with in some-way.

The thing was, it was hard to tell what may be pissing Katsuki off, mostly because everything pissed Katsuki off. The bell was too loud. Another alpha was stinking up the classroom with their pheromones when they were helping a classmate with something they were stuck with, obviously elated by being able to provide help. The teacher picked on Katsuki to answer a question even though his hand wasn’t up. A beta picked up a pen Izuku had dropped and returned it to him. A couple that got in their path on the way to class earned a snarl and a shoulder check. Someone passed back the homework for their class and accidentally brushed their hand against Izuku’s wrist, which nearly made Katsuki attack them. A pair flirting slightly too loudly in the back of their next class earnt a withering glare and then a pen being chucked at them when they were too immersed in each other to see Katsuki’s death glare. Another teacher picked on Katsuki and he’d been so busy glaring at the couple that he didn’t have the answer and felt embarrassed. An omega sitting in her alpha’s lap at lunch time practically sends Katsuki into a fit. 

It culminated when they witnessed a courting pair scenting at their lockers. 

It was not the first couple Izuku had seen doing this today, but it was the first couple who he’d been so close to as they were doing it. Izuku blushed bright red and looked away immediately, because they were definitely not just scenting. There were hands in places that would’ve made the teachers in his time slap the two with so many detentions they would never have time to complete their courtship. But Katsuki — Katsuki took one look and threw a full-on tantrum. 

He stomped away, leaving Izuku alone for the first time since they’d met. He felt like he could finally breathe. However, he was also in the middle of the school when he had no idea of how to get to his next class. 

Well, swings and roundabouts and all that. 

They had history next so Izuku headed to where the humanities block was in the future and hoped for the best. The classroom numbers had all been changed and new buildings had been added in the future, but he recognised the bright red and pink hair of a pair of people who had been in their class earlier – the ones who had been flirting loudly – and headed towards them to ask for help. 

For once, without Katsuki as a buffer, Izuku realised how many people watched him as he walked. Other omegas and betas sent him piercing looks for hanging out with Katsuki while the alphas tracked his every moment predatorily. It made him shiver, suddenly wishing Katsuki hadn't left at all. 

“Yo, Deku, did you finally manage to ditch the guard dog?” Ashido called out once Izuku was close-by.

Kirishima elbowed her. “What she means is, where’s Bakugou?”

“No I didn’t. The bastard threw things at us for no reason.”

“Bakugou’s always shown his love in… different ways.”

“I’m pretty sure he was just being a bitch,” Ashido grumbles.

“I’m sorry about Kacchan's behaviour. He really shouldn’t have thrown a pen at you,” Izuku said as he rubbed the back of his head. He still had no idea what had gotten Katsuki so annoyed. 

Weirdly, Ashido’s grumpy look melted into a mischievous grin immediately. “Don’t even worry about it. It’s hilarious!”

“Hilarious?”

“Yeah, man,” Kirishima said, an identical grin on his face. “I never thought I’d see the day when Bakugo-fucking-Katsuki got all knot-tied over an omega.”

“Knot-tied?”

“Well, yeah? Haven’t you seen how jealous he’s been getting over all the couples who are further along in their courtship than you two? He’s hissing and spitting like a hopped-up, pent-up, territorial tom-cat with rabies. You haven’t asked him to come out of class once for relief – are you, like, rejecting him or something?”

“No judgement or anything,” Ashido said. “Bakugou is an… acquired taste.”

Izuku was really getting sick of only being able to ask for clarification. “What do you mean - come out of class for relief?”

“Like… relief,” Ashido said with emphasis. Her and Kirishima sent each other looks when Izuku still looked confused. 

“I was homeschooled?” Izuku said as an excuse for his lack of knowledge to something they seem to think should be obvious.

It was Kirishima’s turn to look at him weirdly. “Like, relief, y’know? Erm, to get the edge off? It’s already hard being so exposed to so many people, where there’s no territory markers and it’s all a no-man’s-ground. It’s hard to know how to react, right? And it makes everyone tense. But then, everyone’s exposed to everyone’s pheromones, and it’s especially hard when you’re got an omega you like and your instincts want… Well, you know what they want. But it’s hard for alphas and omegas to just sit through class all day like that. Especially alphas. So instead of stinking up the classroom with barely-contained horny rage like Bakugou’s been doing all day, we’re allowed to use the midmorning and mid-afternoon breaks to get some relief as long as we come into class quietly afterwards. Scenting or – well, other forms. Whatever you need.”

Izuku felt himself slowly turning crimson with embarrassment the longer Kirishima spoke. Sure, he knew – theoretically – that casual semi-public sex was practised in this time, but it still managed to catch him by surprise. He hadn’t realised how normalised it was and how much it factored in on a day-to-day. 

“Honestly, I’m surprised a teacher hasn’t sent him out of class yet with a volunteer.”

“Relief is okay, but planting your seed isn’t.” Ashido sang. Izuku remembered seeing the slogan in his history class. Vividly remembering it from how he and the only other person in his class who had been born from the result of a known baby-trap had been given the side eye by the rest of the class.

In these times anything that may knock a partner up without the intention of following through was heavily frowned upon. The relief Ashido and Kirishima were referring to mostly consisted of anything that wouldn't get an omega pregnant, not unless the couple was truly serious about their future. 

It was so weird to be experiencing it for real. In the present, while alphas and omegas were still held on a pedestal and allowed to do as they liked in most cases, schools, universities, and places of work were the exception. 

This is all very fascinating, but Izuku is forgetting something.

“What do you mean?” Izuku asks, thoughts screeching to a halt. “Why would Kacchan be jealous?”

He doesn’t know why he asks; he knows why. The reason had been very obviously explained and then demonstrated by Katsuki last night. 

“Well, he wants to get you into one of the closets so he can get his mouth on your-” Ashido was, thankfully, unceremoniously cut off by Kirishima’s hand.

“Bakubro just wants some of your attention.” Kirishima scratched the back of his head with his free hand. “He wants you pretty badly. It’s very obvious.”

It was this that finally made Izuku comprehend the fact that Bakugou Katsuki – the teenage version of his father – desperately wanted to fuck him. Maybe that was why he had asked a question he knew the answer to: he wanted a third-party to confirm, so he could know for absolute sure that this was real. It wasn’t a prank. It wasn’t Katsuki just jumping on a convenient omega in his house; no, he was actively, openly, and seriously pursuing Izuku. 

Kirishima carried on, flustered by Izuku’s shocked silence. Perhaps thinking he still didn’t understand. “If you’re not going to him for relief, you’ll have to go to someone else, otherwise the pheromones will agitate you. That’s probably driving Bakugou up the wall with paranoia. As an alpha, he’ll be both desperate to prove himself and going insane wondering who else you’ll go to if not him. If you’re not being receptive to his courting, he’ll be looking to take out any competition so you’re only left with one option.”

As if on cue, Katsuki appeared at the mouth of the hallway, moving towards them at speed. He was hollering before Izuku even got the chance to comprehend his sudden reappearance. 

“OI, SHITTY-HAIR, YOU ONLY GET ONE WARNING – BACK THE FUCK OFF FROM MY OMEGA.” Katsuki forcibly inserted himself between Izuku and Kirishima, snarling in the other alpha’s face and blasting his scent in a way that was just inviting a fight. 

Izuku knew Kirishima from the future; he was a pretty chill alpha and always has been. He must be, in order to be able to befriend Katsuki from such a young and ornery age, and then continue to keep that friendship into being adults. But even Kirishima had his limits and suddenly challenging him in front of Ashido, the omega he was courting, just for speaking to someone Katsuki was interested in, was apparently it. 

The alphas started puffing up, snarls racketing up as they entered into a promenade of strength to try and intimidate each other out of fighting them. It just made each other more angry. Kirishima was taller and thicker, but Katsuki was bulky too and was a lethal weapon of an alpha. He wouldn’t let sheer brute strength psych him out. 

“Oh, shit,” Ashido said.

“Oh, yes!” Screamed a nearby extra in the hallway. “ALPHA FIGHT!” 

A crowd quickly formed. The rise in competitive and bloodthirsty pheromones did nothing to calm the alphas in the centre. It was a powder-keg just waiting to explode. 

Izuku could tell from their eyes that they were both running on instinct. If Katsuki was going to fight for real he'd do some real and extensive damage, even if it was his best friend. He was too competitive, he’d need to get Kirishima belly up and neck in his teeth before he’d accept a win and Kirishima will not let him do that easily. 

“What do we do?” Izuku asked Ashido desperately. “We need to get the teachers. To-to stop this!”

“The teachers won’t get in the middle of an alpha territory fight. It has to be us. I’ll calm down Kirishima. If you can get Katsuki to stand down then he’ll stop.”

“How the fuck do I get that-” Izuku gestured to Katsuki, who looked half-feral - “to do anything?”

Ashido sighed like Izuku was seriously testing her patience. “Sorry for this, but I like my boyfriend alive.” 

“What?”

Ashido mercilessly pushed Izuku towards Katsuki without any remorse. “Are you an omega or not?! Soothe him!”

Even just that little push had gotten Izuku far too close to Katsuki for comfort. The crowd had forced a circle around them, meaning there was no way to separate the two alphas. Katsuki and Kirishima never broke eye contact for a second, their bodies eerily still as they waited for the other to make the first move. With no way out of the circle, Izuku would have to distract Katsuki completely in order to get this to stop. 

His heart thrummed in his chest. The air was awful, clogged with angry alpha scent and the bloodlust of the crowd. He hated every breath he took. It made him feel ill. He desperately wanted to be anywhere but here. 

He wanted Katsuki to take him away from here. 

The thing was, although Katsuki looked like he was about two seconds from going on all fours and mauling Kirishima where he stood, no matter what stood in his way. Izuku still wasn’t scared of him. It was so stupid, because this wasn’t his dad, but there was still a part of him that said that Katsuki would never, ever harm him. Even when he was like this. 

Maybe especially when he was like this. 

Katsuki was Izuku’s protector, he always had been, and Izuku really needed a protector right now.

So he approached Katsuki with his hands up, showing no threat. He was scared of the jeering crowd and how claustrophobic it made him; he was scared that Izuku’s presence here might mean his dad lost one of the few friends he had in the future – and the best of them to boot; but Izuku wasn’t scared of him. He wasn’t scared of Katsuki. 

Hand up, neck-bared, eyes diverted, Izuku pushed as much need and fear into his own scent as possible, aiming to distract Katsuki. He may have been making the high-pitched sorts of cries a pup made to their parent — or an omega made to their protector. Because if there was one thing Izuku was sure of in this universe, it was that if Izuku needed him, Katsuki would do whatever was needed to make him happy. 

Sure enough, Katsuki’s attention flickered away from Kirishima just for a second. Then again, when he recognised that it was Izuku in front of him, smelling scared and coming to Katsuki for help. He cocked his head and whined, as if confused why Izuku was worried but trying to reassure anyway, and then tried to move Izuku behind him, where he would be furthest from Kirishima and therefore best protected in Katsuki’s eyes. 

Izuku didn’t let him; once Katsuki’s hands were on him, he held them in place on his waist. “Kacchan.” He whimpered, radiating the silent message: ‘ defend me’. It made Katsuki freeze in place, focusing entirely on Izuku. Perfect. “Kacchan, I don’t want to be here.” 

Katsuki cocked his head again. But before Izuku could say anything else, someone from the crowd pushed into them and separated them. 

“LET THEM FIGHT.” 

“YEAH, GET OUT OF THE WAY, OMEGA!”

If their aim was to get Katsuki to fight Kirishima, they failed. Katsuki’s renewed snarls were aimed at the crowd and he shoved the person who had touched Izuku onto the floor, a foot on their chest to hold them down. He swiped at anyone close enough, snapping his teeth until the circle was much larger than it had been before as everyone rushed to get away from him. 

Katsuki would’ve gone after them, but Izuku latched onto his arm. 

“Kacchan!” He tried to get his attention, but it wasn’t working anymore. Katsuki was too keyed up by the crowd and the active threat they posed. “KACCHAN!”

No dice. He was too far gone, and the sight of everyone running away, inciting a chase, wasn't helping. 

Letting go of Katsuki for just a second, Izuku quickly shuffled off his jacket. Praying this worked, he stood on tip-toes to shade Katsuki’s head with it, holding it on either side of his face so that under its cover Katsuki had no choice but to only look at Izuku. 

“There we go, that’s better isn’t it, Kacchan? It’s just me and you.” Katsuki nodded, lost. His arms wrapped around Izuku’s waist. “Just bend down a little bit, yeah? You’re too freaking tall for me to hold this for long.”

Katsuki didn’t just bend down, he sank all the way to the floor, sitting cross-legged and tugging Izuku down so he was sitting pressed right up in his lap, chest to heaving chest. They were right in the middle of the corridor, Izuku could still just about see people around the sides of the jacket, but it was like the entire world was drowned out. The smells of the crowd couldn’t reach them here, Izuku’s jacket acted like a barrier and with the rate Katsuki was pumping out territory-claiming pheromones, it wasn’t long before the air they shared smelled exclusively of them. 

Katsuki’s eyes finally seemed to gain some lucidity. “Deku?”

“Yeah, it’s okay, I got you.”

“Are you okay? Did anyone hurt you? Did I-” Katsuki didn’t seem able to finish the question. 

Izuku smiled, shuffling his hands so he could brush a bit of Katsuki’s fringe out of his face. This seemed more like the Katsuki he knew. “I’m absolutely fine. You’d never hurt me.”

“I wouldn’t,” Katsuki agreed easily, leaning into Izuku’s hand. It was adorable and it made Izuku’s heart do a pathetic sort of flump. “But… thank you – for stopping me from going after Shitty-hair. The whinging would be awful, from Ashido and him both.”

“You can just say they’re your friends and you don’t want to hurt them.”

Katsuki snorted. “I never said they’re my friends. I just don’t want the detention that would come with beating him up.”

Is that all he’d get for mauling a classmate? Jesus.  

Katsuki shifted underneath him, reminding Izuku that he was sitting in Katsuki’s lap. Accentuated by the shadows underneath Izuku’s jacket, Katsuki’s expression shifted into something devious as he nuzzled their jaws together. “Such a good omega for me.”

Izuku flustered and tried to resist as Katsuki pulled him in closer. “Not your omega.”

“Deku,” Katsuki rumbled, nose skimming up the side of Izuku’s jaw all the way to his temple. “You’re mine.”

It was fucking boiling under this jacket. Why was Izuku still holding it up? “Well, that’s up for debate.” 

“No, it’s not. I’ll kill anyone else. Anyone who makes a move on you, or anyone you try and court, I’ll kill ‘em all.”

Izuku had heard Katsuki threaten to kill many people in his life; this is the first time he believed that Katsuki would absolutely follow through. 

“You shouldn’t. Kill anyone, that is. I don’t want you to.”

Katsuki chuckled. “Then why did you slick up when I said it, Deku?” His nose pressed into the ticklish place between Izuku’s neck and shoulder, inciting a whole body shudder that prevented Izuku from replying for a couple of seconds. In that time, Katsuki’s hands on his waist snaked around to flex on Izuku’s ass. “Mm, knew I’d get you in my lap sooner than later.” He groaned, fangs ginormous from up close. “God, you smell so good. I can make you do more than slick, if you’d like. There’s a relief closet real close by. Or we can stay right here, I’m not picky – we can give those chuckle-fucks the show they wanted.”

Shifting, Izuku realised he was sitting on something hard. 

His mouth watered. It was big.

“You arsehole. I was just trying to stop you from mauling your best friend and you’re completely taking advantage of the situation.” Izuku tried to pull away, but Katsuki held him down with barely any effort. If anything, Katsuki just pulled him closer so their crotches were rubbing right against each other, sending sparks. 

Katsuki’s breath was hot and damp on Izuku’s ear as he licked the gland behind his ear and then bit the earlobe in reprimand. Izuku tried to ignore how it made shivers race down to his very toes. “You came to me, nerd. You didn’t have to get involved, yet you did your duty as my omega and calmed me down with your scent. You came to me.” He repeated with such heartfelt joy that Izuku couldn’t find it in him to refute it. 

“You can deny it all you want, Deku. But you came to me for protection, you scented me, you calmed me down, you’re still keeping that jacket over our heads.”

This time, Katsuki didn’t stop Izuku as he pulled himself away. The hallway air was cool compared to the heat under the jacket. It was also blessedly clear, everyone else having gone to class. All that were left were Ashido and Kirishima, in a very similar position to Katsuki and Izuku’s previous position, minus the jacket. 

They also looked about two seconds away from fucking on the floor. 

When Izuku ran, Katsuki took chase.

The idiot had to screech to a halt once they got to the classroom though. Their teacher just gave them a knowing look at their late entrance and didn’t even pause in her lecture. 

Of course, Izuku’s luck didn’t hold out. That would’ve been too merciful of the universe. When they got home from school, Katsuki cornered him just before he tried to go and hide in his bedroom until dinner. 

Katsuki caught him by the wrist before he could enter his room. 

“Why are you being so fucking stubborn about this?”

“Because I don’t want you.”

“That’s a lie. I know you want me, so why are you insisting on this chase?”

Izuku was starting to get annoyed; no is no, it doesn’t matter why. But still, it was too good of an opportunity to get Katsuki to back off. 

“I don’t want an alpha like you, who just wants sex and maybe a trophy omega. I want someone who genuinely cares and looks after me. A proper alpha.”

Katsuki raised an eyebrow and something wicked and knowing crossed his face. “I see, so you want a daddy.”

“What? No!” Izuku squeaked in mortification. “N-not a d-daddy. I have a d-” 

“Yes, this mysterious daddy you’re always talking about. Tell me, do you think he could fuck you half as well as I could? Get you on your knees; get you sobbing for his cock?”

Something angry rushed through Izuku and he spoke without thinking. “He could fuck me better than you ever could.”

Katsuki smirked. “Is that a challenge?”

Screaming in inarticulate rage (and lust), Izuku slammed the door in Katsuki’s face. 

Through the door, Izuku heard Katsuki’s sigh. “And just for the record, I don’t just want sex or a trophy omega. I just want you. I’d do anything to be the kind of alpha you want, Deku. Anything.”

A moment later and Katsuki’s bedroom door clicked closed, leaving Izuku to thump his forehead against the closed door, wondering how this was his life. 

Chapter Text

The next day, as if to prove his words about being serious about wanting Izuku, Katsuki’s smothering got even worse. There wasn’t one moment of the day when he wasn’t in Izuku’s space, hands on any part of Izuku he could get away with as he tied his laces, carried his books, fed him snacks, or helped him with his work, all while trying to subtly scent him without Izuku realising. 

By lunchtime, Izuku had had enough. 

The now familiar feeling of Katsuki’s body pressed far too intimately to his spine triggered something in him. And that something was pure, unadulterated rage. How could the alpha be so brazen? Izuku was standing in the middle of one of the school's fields, surrounded by people. Izuku would die of embarrassment if Katsuki tried to pull one of his moves like he had done earlier. 

Enough was enough; Izuku had to do something to get it through this alpha’s stupidly thick skull that Izuku was turning him down. 

Katsuki’s voice rumbled as he said… something. Izuku wasn’t listening. All he registered was that the alpha was leaning over him. 

So Izuku did the only logical thing he could think of and he judo flipped him straight over his shoulder. But he knew his father and knew it would take more than a show of force to get him to agree to something: direct submission would be needed. So, to drive in the point, Izuku spun and sat directly on Katsuki’s chest as he pinned his arms down with his knees. 

It went pretty well, considering the ridiculous skirt he was in. It was voluminous, so it got a bit tangled and ended up flying everywhere as he sat down, but Izuku had gotten the alpha on the floor. He’d won. 

Okay, so maybe he’d kinda ended up covering Katsuki’s face with his skirt. It was still his win. He quickly uncovered Katsuki’s head, preparing his smuggest smirk for what would surely be a humiliated alpha. 

Katsuki’s red face was revealed to him, fangs bared, eyes dilated. But he didn’t look angry. No, the look he was wearing was one Izuku had become far too familiar with since he’d come to the past: Katsuki was aroused. 

Admittedly, Katsuki hadn’t expected to be flipped like a pancake by an omega who barely came up to his shoulder. 

His instincts surged to get off his back and out of the position of submission, but Izuku was too quick to pin him down with his legs on his arms and weight, preventing Katsuki from pushing himself up. It was a move so elegant and graceful that Katsuki had absolutely no doubt that every movement was planned in its entirety by Izuku. 

It was, in summary, hot as fuck. 

If it were anyone else, Katsuki would be pretty pissed off about the entire event. But here, like this, his head was literally buried under Izuku’s skirt – a position he was only too happy to be in. This little menace; Izuku had done it on purpose, he had to have. 

Because like this, if Katsuki angled his head just right, it gave him a perfect little glimpse at the utterly slutty underwear his future omega was wearing. 

Katsuki knew he’d seen the hints of lace bras under Izuku’s tops. The matching panties were everything he’d dreamt them to be: flimsy, sexy, enticing.

And wet. He could smell it. From arousal new and old. 

Izuku kept telling Katsuki to leave him alone, but there was no way he’d wear underwear like that unless he wanted someone to see. Specifically, to tempt Katsuki to the point of insanity. What a coy little thing. So direct and yet indirect with his flirting. And with such slutty underwear, no way could Izuku be a prude little thing. 

The way Izuku was sitting put the seat of his underwear right against Katsuki’s chest, and rubbed trace amounts of slick directly onto his clothes. Oh this omega was good at this. And Katsuki had thought he’d been bold; so obstinate in not taking no for an answer with his seduction. 

It all became so crystal clear to Katsuki that Izuku must have just been playing coy until now, like a good demure omega who had been raised not to look too desperate for an alpha’s knot. He must want to be pursued. After all, why would he wear underwear like that unless he wanted someone to see it?

The skirt was removed from his head – no, please, just give me a minute more – and Izuku’s face was revealed over him, the most triumphant look adorning his features. Of course he would be, after such a masterful courting move like that. The omega deserved this win.

Oh, Deku, Katsuki thought, I understand what you want now. 

Izuku’s look faltered, confidence suddenly disappearing now that his message had been received. So cute. So now both of them were blushing. 

Katsuki shifted as much as he could, his hard cock uncomfortable in his pants. He wishes Izuku would sit a bit further down, undo the button and zip of his trousers, slip those filthy panties to the side and just slide down on his cock. Hot and rippling around him as everyone watched and saw what a good little omega he was for Katsuki and Katsuki only.

Ah, fuck, even the mental imagery was too much. Pent up and desperate after the last few days, Katsuki nearly came. 

Panting and disoriented as he tried to calm himself, he couldn’t stop Izuku from running away – again.

Izuku felt like he was on the edge of a very dangerous precipice. One that Katsuki was doing his absolute best to push him off of, if only so that he could catch Izuku when he fell. So Izuku did like Zack Effron and he got his head in the game. He swore to himself that come hell or high water, he was going to push Katsuki’s attention onto Ochako – or literally die trying. 

He got this weird, churning feeling in his stomach when he thought about it too hard. He didn’t want to curse his Kacchan to over a decade of unhappy marriage, but he also wanted to exist, please and thank you very much. 

Once he got back to the future, he’d either fix his parents’ relationship, or he’d convince his daddy to move on to someone else. Because, based on his younger self’s behaviour, if Katsuki truly hadn’t touched anyone since Izuku was conceived then he must be pent up as fuck in the future. Izuku didn’t like to think of his dad that way, but he had become intimately familiar with how easily turned-on Katsuki could be over the last couple of days, so he felt he deserved some leeway. 

His attempts to get his parents together started like this. 

“Kacchan, aren’t you interested in anyone else?”

Katsuki paused in his attempts to get Izuku to sit on his lap in the common room. “No, why? Did someone say I was? Who was it – I’ll kill them. They’re a big fat liar, I only want you, Deku. I’ve only ever wanted you.”

Izuku’s brain melted, and he didn’t ask again for the rest of the day. 

He was so out of it, he accidentally allowed Katsuki to walk him to classes with his hand in Izuku’s back pocket all day. 

Then, the next day, Izuku tried something else.

“I’m obviously not going to accept your courting, so why not try someone else? Say… how about that girl over there? I think her name is Ochako.” 

Everyone always commented on how Izuku looked so much like his mother. Hopefully Katsuki would agree and move onto the more appropriate target.

Katsuki didn’t look away from where he was very obviously trying to peek down Izuku’s shirt. “Are you wearing a lace bra?”

He stopped looking when Izuku slapped his shoulder - hard. “Kacchan! I said, isn’t she cute?”

“Who?”

Izuku pointed. “Uraraka Ochako.”

Katsuki squinted in her direction for about 0.5 seconds before losing interest. Instead, he brought up a spoon to feed Izuku some of the lunch he was ignoring. “Not really. No one’s cuter than you, but I guess she’s got similar eyes to you. Not nearly as pretty though...” he trailed off, staring deep into Izuku’s eyes. “Yeah, not nearly as gorgeous.”

Izuku swayed, blushing up to his ears. Katsuki looked at him so adoringly that it made his heart hurt.

Flustered, Izuku accidentally let Katsuki feed him half his lunch as he plotted his next tactic to put the time-line to sorts. Katsuki's pack of friends at the table weren’t nearly as oblivious and there was much back-slapping and congratulatory looks sent Katsuki’s way that Izuku just completely missed. 

“Why do you look so smug?” Izuku asked at the end of lunch, when the bell shook him out of his thoughts.

“No reason,” Katsuki said, hoisting Izuku’s bag on his back along with his own. “Ready for maths?”

Izuku should probably be getting pretty sick of getting cornered against some hard surface in the morning while Katsuki scented him. 

“You know, I see Uraraka Ochako watching you in the hallways. I bet if you did this with her, she’d actually reciprocate.”

“You reciprocate plenty.” Katsuki smirked, and – using Izuku’s shorter skirt against him – stuck a hand underneath to just barely graze against the junction of Izuku’s thighs. Izuku squealed and pushed him away; Katsuki’s fingers still came away wet. 

Dazed, the alpha stared at his own hand for several long moments. His cocky confidence disappeared as dilated eyes stared at the sheen on his fingers, nose flaring to take in more of the scent. “You smell so good.”

Izuku tried to dart forward, desperately hoping he might be able to wipe it off Katsuki’s fingers, but Katsuki was quick to slap his hand against his neck glands, groaning and knees going visibly wobbly as he scented himself with Izuku’s slick. 

“Fuck. Fuck, please. Please give me more. Just a taste, I need to wet my throat.”

“Shut up. Just – shut up! Do you even hear yourself sometimes!?”

That evening they were watching TV on the sofa downstairs, legs tangled together. They were watching some early episodes of the All Might series and Izuku had been too busy geeking out about being able to watch them on their first air date to notice things such as Katsuki carefully pulling him close. He was too used to ending up in this position with his dad for Katsuki to register as a threat to his distracted mind.

They’d started with a good measure of distance between them, but somehow Izuku’s head had come to rest on Katsuki's chest as he half lay on him. Katsuki’s hand may or may not be on his ass. He swore he didn’t remember how this had happened, he was just too tired to argue about it. 

“It’s surprising you like this. Most omegas don't like All Might. Too much blood and gore,” Katsuki remarked during one of the ad breaks. His hand stroked up and down Izuku’s spine and it was making it hard to concentrate and not fall asleep.

“I think you’d be surprised,” Izuku replied. 

“Maybe. You’ve got me questioning everything, baby.”

“Maybe you’d be happier with one of those omegas. The ones who don’t like things like All Might.” 

“I never said I wasn’t happy, idiot.”

When the episode was over, Izuku turned off the TV using the remote. Through his half-closed eyes, he watched Katsuki’s expression. “Kacchan, why do you even like me so much?”

“You’re seriously asking me that?”

“I am.”

Katsuki hummed and shifted them so one of his hands could run through Izuku’s hair. “Believe it or not, nerd, I like how feisty you are. You took no shit from those betas that tried to assault you and would’ve won if he hadn’t gotten that lucky shot. Not to mention that you only got into those circumstances, despite the threat to yourself, because you wanted to help someone else. That's pretty admirable in my opinion.”

Izuku thought Katsuki would stop there. To him, he thinks it could only have been that one moment where they met that stood out to Katsuki because, apart from Katsuki’s bold attempts to fuck him, those are the only events that had stood out to him. But Katsuki continued.

“We’ve had so many conversations over the last few days. They may not have meant much to you, but they did to me. We have so much in common and you’re not scared to challenge me on what we don’t agree on. It’s infuriating, but at least you have your own mind. And then, the more I learn, the more I like. You get on with my parents; you’re hot as fuck; you know the All Might theme tune by heart and sing it every episode; you smell divine; you know every single answer to the questions the teachers ask at school, and I’ve seen your notebooks. You’re beautiful, intelligent, and strong. What kind of idiot wouldn’t want you?”

“Really?” Izuku asked, much more touched than he’d like to let on. “But you’re so focused on-”

“On fucking you? Well, yeah, I know what I want, and I’m not going to let a catch like you get away.”

“But there’s so many better choices for you at school.”

Katsuki snorted in disbelief. “Who?”

“Uraraka Ochako?”

“Who?”

“Oh, c’mon. We’ve talked about her before. The netball captain? The girl who sits behind you in geography.”

“Round-cheeks? How the fuck is she better than you?”

“Why don’t you try talking to her and finding out?”

“Hard pass. I’ve got everything I want right here.” Izuku’s world uptilted as Katsuki suddenly picked him up bridal style. “Just go to sleep, Deku, you’re obviously delirious. Maybe you’ll be thinking straight in the morning.”

True to Katsuki’s prediction, Izuku was dead asleep by the time they hit the landing. He tried not to feel too self-satisfied as he let himself into Izuku’s room. For all his talk, the omega obviously liked Katsuki enough to trust him to take him into his nest and get him ready for bed. No omega lets just anyone see them sleep, it was a mark of deep trust usually reserved for family and mates. Especially to allow an alpha to see an omega in such a state of vulnerability; it was actually one of the later courtship steps and it buoyed Katsuki like nothing else that Izuku was skipping to it. This courtship had been so backwards and forwards, but he had been enjoying how his omega kept him on his toes. 

It fed something in him to have Izuku asleep in front of him. Katsuki was careful to not disturb the omega as he laid him in his nest. 

Now, theoretically, Katsuki could leave it there. However, Katsuki had never done the minimum in his life and he was certainly not going to start with his omega, not when they’d reached such an important milestone in their courtship. 

Izuku had washed and brushed his teeth earlier at Katsuki's demand. It paid off now as he didn’t have to wake up to do it. All Katsuki had to do was ever so carefully strip off Izuku’s clothes. 

Each layer was more exciting than opening a present. First to go was the orange blouse, warm from Izuku’s body heat and slippery to Katsuki’s touch; taking it off revealed a dark lace bralette underneath, supporting the small swell of Izuku’s breasts. Hmm, Katsuki may have overestimated his own resistance. He was already imagining fucking his cock between them, and he was always more of an ass guy. 

Still, he carried on. As Izuku’s alpha, he was entitled to see what Izuku wore under his clothes. He left the bra on – he’d take it off last – and stripped off the skirt.

Katsuki groaned, too loud for the silent room. Matching lace panties, sheer and showing off the curves of Izuku’s pussy lips. They were just ever so damp at the crotch and the smell of Izuku drifted up to him. 

Mostly because Katsuki’s nose was suddenly much closer than it had been before. When had he fallen to his knees? 

Whatever, it doesn’t matter. In his unclothed state, Izuku started shivering and Katsuki had plans about how to warm him up. 

Much later, Katsuki left with Izuku’s slick lingering on his tongue and with a pair of wet panties in his pocket. Behind him, Izuku was tucked up nice and tight in his duvet, cheeks still flushed from the orgasm Katsuki had teased him to, so pretty as he responded to Katsuki's desire even when asleep.

It was ridiculous that Izuku thought that there could ever be another person Katsuki would want more than him, when Katsuki was convinced that no one else could satisfy him like this. Izuku brought out urges in him that Katsuki simply hadn’t experienced with anyone else. 

Well, Katsuki would just have to show Izuku the truth, wouldn’t he?

Rejecting Katsuki had obviously not worked like Izuku expected, so, after Katsuki's surprisingly heart-felt declaration last night, he had taken to stalking Ochako in the halls. 

Unfortunately, he had his own stalker. One who didn’t appreciate him stalking someone else.

Izuku was at his locker when Ochako walked past while talking to someone else. He forgot what he was doing, too focused on following her with his eyes. He needed to speak to her: maybe he could convince her to approach Katsuki and fix the timeline that way. Surely, there must be some way to push them together. Even if Katsuki seemed reluctant to even look at anyone who wasn’t Izuku right now, there must have been a reason he’d fallen in bed with her in the original timeline. It couldn’t have been all instincts. 

Izuku already knew what the draw was for Ochako. He had seen her watching Katsuki over the past week and, despite Izuku’s presence and Katsuki’s attempts to court him, her eyes had been those of someone eying up a target. She wanted access to the Bakugou fortune and she liked that it came with such a good-looking and powerful alpha. 

She wasn’t even remotely worthy of Katsuki. It prickled at Izuku that he was trying to set them up, but he had to if he wanted to exist. 

And to do that, he needed to approach her. 

Izuku tries to follow Ochako around a bend in the corridor, but a hand slams into a locker right next to his face. It honest-to-god dents under the force.

“Oi, stop ignoring me! Why do you keep following that fucking beta extra?” Katsuki’s quick to follow though, encasing Izuku between himself and the locker to his back. “You talk about her all the time.” Then, as if in realisation. “You said she was cute… Do you like her? Do you want her to court you?” Katsuki looks murderous. “Are you trying to sneak off with her to get some relief? I’m losing to a shitty beta — are you fucking kidding me?” 

It’s quite impressive, really; Izuku has never met anyone else who can jump to conclusions like Katsuki. 

“Deku, stop ignoring me!” Katsuki’s definitely whining now. He ducks down to get even closer to Izuku’s face until he is all he can see. “There, that’s how it should be. Keep your shitty wandering eyes on me, okay, nerd? Aren’t I the best-looking alpha you’ve ever seen?” Katsuki starts flexing his chest and biceps and Izuku feels his thoughts go a little fuzzy. He’s so close to Katsuki’s face that he can see how his nostrils flare, just slightly, in response. “Yeah, that’s what I thought. Stay just like that.” 

Katsuki emits his scent, engulfing the space between them with honey-thick warmth and desire; promises of pleasure and protection and a strong ability to provide anything Izuku needs until his head starts to feel heavy under the influence of such raw, undiluted desire and need. Izuku licks his suddenly dry lips and Katsuki’s gaze drops immediately. 

He doesn’t look away. 

“Er-” Izuku forgets what he was about to say, too distracted by the slick pink of Katsuki’s lower lip as it gets bitten between pearly white teeth. “Are you getting closer?”

Indeed, Katsuki’s close enough that Izuku can feel the brush of air as he huffs lightly. “Obviously, Deku.” 

“Right, yeah.” For some reason, Izuku thinks he should be alarmed by that. He can’t think quite why though, at the moment. Katsuki is arresting at any distance, but from this close it’s like it’s all Izuku can think about. “Kacchan is so pretty.” Fuck, he hadn’t meant to say that. 

Katsuki’s nose runs up the side of his cheek and Izuku’s eyes flutter shut involuntarily, breath hitching in anticipation. The softest of kisses is pressed to the outside corner of Izuku’s eye and he can’t smother the needy whine trapped in his throat. His hands clench where they’re fisted in Katsuki’s jumper, he can’t remember when they got there. 

“Kacchan,” he says. A whine, a demand for more. 

“Deku.” Katsuki’s mouth trails down, hovering over the corner of Izuku’s mouth for a second before kissing there too, and Izuku has never wanted something more in his fucking life. “Can I- mmph!”

Later, Izuku will rationalise to himself that he just had a brief moment of insanity, brought about by Katsuki working him up all week. He’ll think that it’s just because he’d been exposed to so many pheromones at school and at home, and it was only natural he broke eventually. He’ll stew over the fact that of course he chose Katsuki: it’s only natural to want the best possible partner. 

But in that moment, all he’s thinking about is how he fucking needs Katsuki’s mouth on his or he’ll fucking die. 

He grabs the collar of Katsuki’s jumper and pulls. It’s all a rush, but he’s pretty sure Katsuki meets him halfway because there is no hesitation or shock when their lips meet. It’s ferocious from the get go. Both of them are too pent up and frustrated for soft and savouring. They’ve been hurtling towards this inevitable end, winding each other up all week, and it comes out in the kiss as they practically devour each other. 

Katsuki kisses with his entire body. Hands everywhere as he shoves Izuku up against the locker with such force that the entire row rattles, pressing him there like he’s trying to merge them together. It’s probably painful, but fuck if Izuku notices, too distracted by how hot it is. Katsuki’s kiss presses with the same urgency. Tongue is introduced too quickly and Izuku buckles to the first wet lick across his bottom lip; then loses his mind when the slightest hint of teeth gets introduced.

Vaguely, he thinks he hears a bell. Definitely hears some chatter of people passing by, but whatever. He’s got Kacchan’s tongue in his fucking mouth, why would he give a shit about anything else when he could be listening to the rumbles coming from Katsuki’s chest?

Izuku may be small, but he’s strong too and he’s not going to let Katsuki push him around without giving something back. He probably shouldn’t but he rolls his hips up against Katsuki, groaning when Katsuki uses it to shove his way even further into the space between Izuku’s legs, one thigh pressed at the perfect angle against his pussy. The static shock pleasure keeps his hips rolling, chasing that feeling, and he’s not the only one.

To Izuku’s vocal displeasure, Katsuki breaks the kiss with one last bite to his tingling lower lip that stings so good. “Fuck, Deku,” he rasps. “C’mere.”

Katsuki’s mouth trails down to Izuku’s neck, bending his knees so that he can get closer. His hands skim across Izuku’s clavicles, thumbs rubbing into the hollows of his neck before running down, circling Izuku’s tits - and oh, they need to come back to that. Soon.

Like that’s not enough, Katsuki’s hands come down and physically prise apart Izuku’s thighs, pulling until he wraps his legs around Katsuki’s hips and it’s literally only Katsuki’s weight against his that’s holding him up. 

Izuku wants him so bad. Why haven’t they taken their clothes off yet?

The final warning bell rings, just barely registering in the melted mush that is Izuku’s brain. 

Oh yeah, because they’re in public. They probably shouldn’t be doing this here, but this isn’t the worst thing Izuku’s seen in the corridors this week and Katsuki gets the angle just perfect so that he can slot his trapped cock right against Izuku’s mound; he makes the most perfect, growly sort of “ah” right in the shelter of Izuku’s neck and he thinks he’d be insane to stop now. 

He wants to hear Kacchan making more of those noises and to know it’s because of Izuku that he made them. 

Nosing at Izuku’s neck, Katsuki tries to smother his own little noises of pleasure by sucking marks against Izuku’s neck. Katsuki gets to this spot just under and to the side of Izuku’s chin and he’s quick to bare his neck, practically flopping back against the locker as he gives Katsuki free reign to do whatever he’d like to him, just as long as he keeps making Izuku feel so good. 

“Fuck, yeah. You taste so good, baby-boy.”

This, somehow, is what slaps reality and sanity back into Izuku’s wanton body. 

Baby-boy: it's something his dad calls him when he’s especially affectionate. 

“Wait–” Izuku tries to say. He loses every track of what he was thinking immediately; Katsuki grinds against him, the skirt Izuku’s wearing doing nothing to protect his pussy from the rough friction of Katsuki’s trousers. Nonetheless, the material slowly gets wetter and wetter. Some of it is Izuku, some of it is Katsuki. 

It's rough and desperate, but there’s only so much it can do for Izuku. Katsuki, on the other hand, stills after a few minutes. Panting into Izuku’s neck as he goes tense and growls and shivers. 

“Did you just come?”

“Fuck,” Katsuki drops Izuku’s legs, still crowding him against the lockers. “Fuck, that was so good. Here, let me–” Izuku’s thoughts are still only operating at half-speed, so it takes him a moment to understand as Katsuki fumbles at Izuku’s skirt, and manages to get his hand underneath.

“Wait, Kacchan–”

Fingers slide against his clit and any protests fly away. 

“God, you’re so wet. Wanna feel it on my tongue, drink you down.” Katsuki groans, his body sliding down like he’s about to get on his knees right there and then in the corridor. Completely willing to kneel in front of Izuku for everyone to see. 

Izuku thumps his head back in defeat, feeling the heat in his belly getting stronger. The dull pain doesn't do much for his rationality. 

Fuck it. FUCK IT. 

He’s close, it’ll only take a minute or two.

There’s not a massive amount of people left, but there’s still enough that Izuku can’t just forget about them, no matter how fucking much he needs to come. Izuku stops Katsuki from going anywhere, using his legs to keep him in place. “You want them all to see me fall apart? Want them to see me come?” He taunts. “Do you think they’ll watch and imagine themselves doing a better job?”

The snarl Katsuki makes isn’t made for the human throat. Bass and guttural, he shoves back up to tower over Izuku, covering his entire body so no one can see him behind the broadness of Katsuki’s body. A finger slides into his pussy and crooks just right. It’s a lot, but Izuku takes it easy, his pussy wanting something much larger. 

Slick dribbles down his thighs, ticklish and distracting. “Stop looking at other people when I’m right here, omega. Do you think I’d let anyone even imagine doing this?” Katsuki's forearm slams into the locker above Izuku's head, and his finger pulls out of his pussy just long enough to line up two fingers before slamming back in with a splatter of slick. “In your fucking dreams, you’re mine.”

Close. He’s so close. Tight and wet around Katsuki’s fingers, the stretch just slightly too much so quickly, all while Katsuki's thumb teases his clit: it makes sparks skitter down his spine. Izuku didn’t know it was even possible to get this wet. Sweat gathers on his temples, his spine, his knees as he hovers just at that precipice. 

Katsuki bites at Izuku’s ear suddenly – when did he close his eyes? “Keep your eyes open, Deku. Look at me. I want to watch you fall apart.” Gasping, Izuku opens his eyes to see Katsuki watching him. Unblinking, eyes dark and intense: a predator waiting for the perfect time to snatch up their prey. “That’s it, good boy. Come for me, Deku.”

Izuku comes. 

Katsuki strokes him through it and then licks his fingers clean when he’s done. “Fuck, I can’t wait to get you sobbing on my cock. Soon, baby. Soon.”

Chapter Text

There was only one way to resume your day after something like that. 

Izuku took the memory of his daddy fingering him against the lockers, crushed it up really small, and buried it down in some deep part of his psyche to never look at again. Despite that, the feelings of shame and failure plagued him. He’d so easily fallen to Katsuki’s seduction and it couldn’t continue. 

Katsuki didn’t seem to get the memo and walked around with a swagger for the rest of the day. 

The gods, or whichever sadistic higher-being watching this travesty, took pity on Izuku. In biology they were forced to do a group project and Ochako was incidentally a part of his and Katsuki’s group. 

(Izuku and Katsuki hadn’t originally been in the same group, but Katsuki had thrown such a tantrum the beleaguered teacher had just thrown her hands up and switched them out.)

It worked well for Izuku’s plans in this case as it allowed him the opportunity to interfere with Katsuki and Ochako’s interactions, so he didn’t tell Katsuki off for it. Something he somewhat regretted since the alpha had been far too smug ever since; it was like he thought Izuku was happy with him for overpowering a poor, hapless teacher who was definitely not paid enough to deal with unsuppressed, teenaged alphas. 

They had decided to work on the project in their free period. All five of their group gathered in a nearby coffee shop to work on the comfortable sofas there. They managed to commandeer two loveseats set either side of a low coffee table. Ashido and Kirishima, their other project mates, were quick to take one and promptly zoned entirely out of the discussion. They seemed much more fascinated in discovering how far they could fit each other's tongues down their throats. 

Izuku and Katsuki observed them while still in line to pick up everyone's drinks. Well, Katsuki observed, Izuku looked anywhere but them. Instead, he watched Ochako, who was waiting on the opposite loveseat just as he had planned. There was only space left for one person to sit next to her and he was going to make sure it was Katsuki. 

Best case scenario, Katsuki and Ochako would be a copy paste of the other couple by the end of this project planning session. Meanwhile, Izuku would be going back to the future before someone could even ask him to contribute to his part of the presentation. 

“How come you’re not yelling at Kiri and Ashido, Kacchan? You seemed pretty upset at them the other day just for flirting.”

Katsuki, hand in Izuku’s back pocket and squeezing like his ass was a stress-toy, clicked his tongue. “It’s too beautiful of a day to be upset.” He sang. Sang. Who the fuck was this? “I’d be more upset, but, honestly, them not contributing will probably be better for our overall mark anyway.”

Izuku quickly detangled himself from Katsuki’s grabby hands and a rapidly darkening frown made its way onto the alpha’s face. “Oh look, your drink is ready. Go sit down and I’ll join you all in a second.”

“You go sit down. I can wait for your dri-”

“Go sit down, Kacchan.” Izuku smiled at Katsuki sweetly, but he could feel how his eye twitched. 

“Jesus-fuck.” Katsuki actually backed away a couple of steps, neck slightly bared before his pride kicked in and he ducked it back down again.

“Good boy.”

“I-” Katsuki choked. He blushed crimson all the way down to his neck. Blotchy and very wide-eyed, Katsuki turned around jerkily and left. 

Holy shit. His dad had a praise kink. 

Why was Izuku thinking of all the ways that could be used against him?

Izuku very carefully took the piece of knowledge he had just learned and he locked it away somewhere very deep down to never be analysed again. It was right next to the locker incident that never happened. And this entire foray into the past. 

Meanwhile, Katsuki, still flushed to his ears, sat down next to Ochako.

Izuku almost felt a real tear gather in his eye. He had finally made progress. Katsuki refused to look at her; in fact, he might have snarled at her briefly when he sat down for whatever reason, but they were still in proximity. He’d take the win. 

“A chai latte for Deku!” 

Izuku accepted his drink and slowly approached the group, hoping not to be noticed. It didn’t work. The second he was close, Katsuki snapped his head around like some sort of horror movie creature.

“Here, Deku, sit in my lap.”

“Not happening. I’ll just go grab a chair.”

Katsuki sighed like Izuku was so very frustrating. “Just take my seat, nerd.”

“N-no, it’s alright, thanks.” But Katsuki had already stood up and moved out of the way and the group were watching. “Fine.”

At least he hadn’t been forced to sit on Katsuki’s lap; Ochako might have taken it the wrong way and thought Katsuki was unavailable. Thank god for small mercies. 

Izuku sat. 

Instead of pulling up a chair like a normal person, Katsuki promptly sat on the ground between Izuku’s legs and leaned his head against Izuku’s knee. “Great, let’s get started so we can get this finished as soon as possible.”

What. 

Izuku tried to move his legs away, but Katsuki gripped them by the ankles, keeping them either side of him. And then he started stroking the bones of his Achilles. 

“Ha! You just want this over with so you can spend more time getting rejected by Deku,” Kirishima crowed. 

Under his arm, Ashido laughed. “Have you even gotten under his clothes yet, Bakugou?”

“I bet he hasn’t. He’s been way too aggressive on the field for him to be getting any relief elsewhere.”

Their laughter cut off abruptly when Katsuki growled at them, slow and serious. “My courtship is progressing perfectly. Shut the fuck up, extras.”

“We’re not courting!” Izuku protested with a frantic look to a keenly listening Ochako next to him. 

He became aware of a deathly silence. 

Izuku’s skin prickled as he gulped and looked down to meet Katsuki’s glower. 

“Care to repeat that, Deku?” He sounded dangerous and deadly. His voice was so low that tectonic plates grinding against each other sounded less gravelly. His eyes just dared Izuku to act out and suffer the consequences. 

A curl of heat coiled in Izuku’s stomach. He shifted as his thoughts turned liquid.

Katsuki sniffed, and the venom in his expression morphed into something much more dangerous. One of his hands came up, in what seemed like slow motion, to fiddle with the edge of Izuku’s skirt. Like he was contemplating flipping it up, there and then, and–

“I NEED TO GO TO THE BATHROOM!” 

“I’ll come with you,” Katsuki said quickly. It came with a lick of pink lips and bared fangs. 

“No! You – stay!” Izuku practically screamed, pointing Katsuki down. 

Izuku wasn’t proud of it, but he shot up and ran to the omegas bathrooms. 

He left silence in his wake. 

“Isn’t he cute?” Katsuki mused to the rest of the group. “One day he’s gonna learn it’s not good to incite an alpha into a chase and I’m really looking forward to teaching him.”

“I’m so happy for you bro, he really is perfect for you,” Kirishima said.

“Yeah, you need someone to knock you down a few pegs,” Ashido agreed.

Ochako didn’t say anything.

It took a solid ten minutes and two very compressed mental breakdowns (what can he say, he’s had a lot of practice over the last few days) but Izuku finally convinced himself to come out of the bathroom. 

Katsuki was missing and Ochako was sitting in the spot Izuku had previously been sitting in.

Wow, maybe Izuku should have breakdowns in public bathrooms more often, if this was the result. 

Only, as Izuku watched from the other side of the cafe, Katsuki came back from the tills, a plate of carrot cake – Izuku’s favourite – in hand. The alpha stopped in his tracks when he saw Ochako in Izuku’s previous spot. 

Maybe he was overtaken by lust and rightness? The feel of destiny finally getting back on track. 

Katsuki stopped. And then moved in sudden motion, as if to make up for the time he had wasted by standing still. He stormed up to Ochako, standing right over her and casting a shadow. 

“Get the fuck out of my omega’s seat, you pebble.”

Of course Izuku wasn’t that lucky. 

But – a pebble? As in, a pebble in his path? Why would Katsuki consider Ochako any sort of obstacle at all? A pebble in his path to what?

“Why? He said you’re not courting. Don’t you want someone more open to your advances?” Ochako said. She remained sitting, and, for the first time, Izuku almost saw where his own attitude was inherited from. 

“We are courting. And he is very much not available, not to the likes of you. Nor will he ever be, so back off, bitch.”

Ochako looked confused for a fraction of a second. “He’s not available to the likes of me?” Then she just looked angry. “Maybe I’m not available to the likes of him!”

This somehow just incensed Katsuki more. He placed down the cake to start rolling up his sleeves, as if he was going to fight (or fuck, Izuku thought somewhat hopefully) there and then. “As if you’d ever be so lucky.”

“Maybe I want an alpha to show me what I’m worth,” Ochako said.

This somehow took the wind out of Katsuki’s sails. He stilled and his snarl dropped in a second. “Well… good.”

“Good?” Ochako asked with hope. 

“Yes. Good. Very good. You should go work on that. Yes, get a nice alpha and go bother them. Betas shouldn’t be concerned about omegas, anyway. Just get out of Deku’s seat.” Katsuki made a shooing motion. 

Izuku had officially lost track of the conversation.

It appeared that Ochako had too, because, although looking very bewildered, she stood up and took her previous place. Katsuki quickly took Izuku’s spot on the couch and practically started rolling around in it to re-establish his scent marks. 

Izuku was still so distracted trying to work out what had just happened that he didn’t even notice walking back over. Nor did he notice Katsuki dragging him to sit on his lap, hands kneading his thighs and brushing under his skirt, wrist scent glands brushing on his bare skin. Then, when the alpha took over writing the project, Katsuki carefully urged Izuku down to sit between his thighs, head resting on one.

Instead, soothed by the hand drifting through his hair, Izuku drifted. 

By the time their free period was over, all he knew was that he had failed again

It all fell apart a few days later during P.E. 

The entire day Izuku had been jittery. He could barely concentrate in class. Everyone smelled so loud, and they were all so close and invaded the territory of his personal space all the time. It drove him to the edge of his patience and he snapped out a lot more. Strangely, it was only Katsuki who was exempt. Him and his delicious, familiar, beloved scent. 

When they got to PE, Katsuki had made Izuku change in a toilet stall while he guarded the entrance. Then, he tried to make Izuku sit on the side-lines, “Just watch me, okay?”

Ha, like fuck Izuku was just going to watch. He needed to move, to work out some of this energy. He needed to run. 

Now, without his father’s permission, Izuku had joined the cross-country and rugby teams in his own time. He played against alphas on the regular, so he knew what he was capable of. The fact that none of them would have neutralised scents didn’t faze him. 

It was P.E. and they were playing rugby. Izuku had forced himself on the team instead of doing whatever alternative sport the school thought appropriate for omegas and betas. Mostly only going out of his way to do so because he had a lot of frustration after the last few days and dismantling some alpha egos by proving that they were not immune to getting their legs swiped out from under them by a 5” 5 omega would satisfy some of his excess energy. 

The coach and Katsuki had both tried to refuse, but Izuku had been raised by Katsuki and Mitsuki. Stubbornness was in his goddamn blood. Obstinacy, a weapon he wore at will. He got what he wanted.

So here he was, on one of the school fields, trying to pass off the ball to anyone on his team. 

Unfortunately, as captain of the school’s rugby team, Katsuki had first pick of players when assigning teams and he’d chosen Izuku before the other captain could even blink. Katsuki was also proving far more interested in preventing anyone from either team from even getting close to Izuku instead of taking the ball and scoring a point. It was driving the coach to hysterics; his star player was violating pretty much every rule while also refusing to be pulled off the field for bad behaviour. 

“BAKUGO, IF YOU PLAY LIKE THIS AGAINST ALDERA I’LL PERSONALLY MAKE YOU REGRET BEING BORN. YOU’LL BE DOING BURPEES UNTIL YOU THROW UP, HEAR ME? UNTIL YOU BLOODY THROW UP!”

Katsuki wasn’t listening to his coach, so Izuku elected to ignore him too. It wasn’t his problem if Katsuki got booted off the team.

“You know, Kacchan, you’re meant to be trying to take the ball off me, not prevent everyone else from the other team tackling me.”

Izuku couldn’t go forward, blocked by a line of the opposite team. However, the opposite team was blocked from tackling Izuku by the fact that every person who had tried so far had been sent to the nurse from Katsuki-induced injuries. And he couldn’t pass to Katsuki for the aforementioned ridiculous reasons. 

Honestly, fuck this. Why couldn’t Katsuki have been on the opposite team? Then Izuku would’ve had an excuse for kneeing him in the balls ‘accidentally’. Katsuki wouldn’t be physically able to make a pass on Izuku if his testicles had retracted back where they came from. 

“You’re welcome to go sit on the side if you don’t like how I play the game, Deku.” Katsuki took that moment to swipe out at someone from the opposite side who got slightly too close. He left 5 pink lines on the other player's arm, but no blood. How generous of him. 

Izuku rolled his eyes. “You’re not playing the game. You’re ruining everyone else's fun. Why couldn’t you have been on the other team?”

Katsuki looked at him out of the corner of his eye and smirked. “You want me on the other team? Want me to tackle you to the floor? I can do that. I’ll get you down on your front and hold you there until you tap out. Does doing it outside do it for you, Deku? Or is it the audience? I can-”

“This isn’t wrestling!” Incidentally, Katsuki is also captain of the wrestling team. “You can’t tap out of rugby. And stop making everything sexual!”

Finally, someone else from their team got close enough and Izuku passed it to them, sick of the entire ordeal. 

“You know, if you want to protect someone then I’m sure someone else wouldn’t mind it. In fact, look over there.” Izuku pointed to where Ochako was with the betas and omegas doing gymnastics. She and some others had stopped what they were doing and were getting surrounded by some passing students. “Ochako looks like she’d appreciate a hero right now.”

“Really? She looks like she’s quite enjoying it to me,” Katsuki said. “Look, she’s flirting with that green-haired extra from our maths class.”

“Green hair?” Izuku casted his eyes around. “Who has green hair?” 

“It’s not nearly as beautiful as yours.” Katsuki ducked down so he was pressed cheek-to-cheek with Izuku, one hand on his shoulder and the other pointing to Midoriya Inko, future mayor of their city. Sure enough, she and Ochako were smiling at each other and Ochako had a hand on her forearm. It did look pretty friendly. 

“She knows Midoriya Inko?” In all his memories Izuku’s mother had never expressed any kind of friendship with the mayor. In fact, they barely talked beyond what polite small talk was necessary when the mayor came for dinner at the Bakugou’s. Was this just another change in the time-line due to Izuku’s presence? 

Maybe with Katsuki’s attention elsewhere, Ochako had moved onto the next target. That was bad; it meant Izuku was running out of time. 

Only, why would she choose Midoriya Inko? As advertised everywhere in the future, Inko was a self-made alpha, and she didn’t come from money. At this time in her life, she wasn’t at all financially stable. Or at least, not enough for Ochako’s life-plan. 

“Why are you so upset?” Soothingly, Katsuki nuzzled into Izuku’s cheek, his hands coming to wrap around either side of him to clasp together on his tummy as he back hugged him. 

Distracted, Izuku nuzzled back. “I didn’t know they knew each other,” he murmured. 

“What’s it to you? Aren’t you happy for her? She’s got the alpha she wanted, it’s admirable.” There was a mind-boggling hint of respect in Katsuki’s voice; it was the first time Izuku had heard him do so while talking about Ochako. 

“OI, BAKUGOU, IF YOU’RE NOT GOING TO PLAY, GET YOUR OMEGA OFF THE FIELD!” The coach interrupted. 

It snapped Izuku out of his thoughts and he shoved Katsuki off with a hiss. “Stop doing that!” He glared and ran off to re-join the game. 

Left behind, Katsuki stomped his foot with frustration; he’d finally been getting somewhere. He glared at the coach with such vitriol that the portly man hid behind his clipboard. 

Katsuki ran after his wayward omega, basking in their shared scents on his skin. 

Eventually, the other team manages to get their hands on the ball, and Izuku finally gets his chance. 

Before Katsuki can understand what he’s about to do, Izuku makes a flying tackle for the alpha. In a collision of limbs, they go down. 

For just a moment he leans in and sniffs him. It’s like his brain goes blank for a second. All he smells is alpha and sex, and he wants more. 

“Fuck!”

“Ha! Get wrecked, Daiki. Taken down by a little omega.”

Before Izuku can assess who just signed their own death warrant, he’s being pulled bodily off Daiki and swung over a shoulder. 

It’s Katsuki, because of course it is. He’s growling and huffing, a hand holding Izuku in place on his shoulder by pressing down on the curve of his buttcheek. Incidentally, Izuku has a pretty brilliant bird’s eye view of Katsuki’s own derriere from this angle. 

Hmm, maybe being thick ran in the family. 

“Put me down, Kacchan!” Katsuki growls at him. Izuku can’t see his face, but his scent is livid. “For god’s sake, why are you so angry now?” 

The coach looks relieved when Katsuki takes them both off the field. No one protests that they’re leaving the game. Izuku honestly hadn’t expected them to. 

“How dare you touch another alpha like that.” 

Out of nowhere, a hard spank is placed on Izuku’s arse and he squeaks in surprise. “Kacchan?!”

“Don’t ever get your scent on another alpha, do you hear me?”

Katsuki’s footsteps thunder underneath them as he stomps from the field and onto concrete, heading towards the changing rooms. Katsuki refuses to say anything else despite Izuku’s concerned noise; it occurs to him that whatever Katsuki is planning, it’s serious. 

He stops moving. Stops wriggling around. He lays flat and submissive in Katsuki’s hold, but it doesn’t soften the alpha at all. 

The walk into the changing rooms lasts an eternity. Izuku cannot remember any of it.

In the empty room Katsuki drops Izuku down into the central bench. 

“I promise not to get my scent on another alpha, Kacchan,” Izuku says, trying to appease the furious alpha. He watches Katsuki from under his eyelashes, neck bared instinctively. 

“No, a promise isn’t enough. You’ve been driving me crazy, and I've tried to be patient, but you went ahead and scented another alpha.”

“Accidentally!”

“That’s no excuse. There’s only so much I can stand. Just lie there for me, I’ll make it all better, for both of us.”

“What do you mean?”

Silent, Katsuki pushes Izuku down onto his back and then kneels between his legs, pulling at his shorts. Izuku’s eyes widen. “Wait, Kacchan–”

“No. No more waiting.” Izuku’s pushed back and held down with a hand on his sternum, his shorts are ripped off, and Katsuki’s hand holds Izuku’s thighs apart. Izuku can’t see his face, but he feels how Katsuki runs his nose along the seam of Izuku’s dripping panties, the movement of air as he inhales greedily. 

Katsuki could order Izuku to stay down and stay still, and yet he doesn’t. He doesn’t need to: Izuku stays where Katsuki puts him, shock holding him captive.

“Did you just sniff me?” Izuku asks weakly. This is all going too fast.

"It's not like it's the first time." 

"Wha- Kacchan, you've done this before? When?"

“I know it's good manners to ask but I just needed to taste your slick, baby. You know how alphas are." 

“You… tasted me?”

“Mmm, I gotta say, you’re just as delicious as I imagined. It wasn’t enough though, barely enough to quench my thirst." 

"When was this!?"

Savouring it, Katsuki inhales again. It’s like he doesn’t even hear Izuku. “I’m done waiting, I need to get my mouth on you.” Fingers pull down his panties. “These are so pretty and wet. Think I’ll save them for later.”

“Kaccha-”

“It’s okay, Deku, I understand. You haven’t come to me once for help during breaks. You must be so frustrated by this point. It’s making you act out; making you get your precious scent on someone who isn’t your alpha. You need it so bad, don’t you? Don’t worry, I'll sort you right out. Give you the orgasms you’ve been denying yourself all this time. All of them.”

Katsuki sits up so Izuku can see his face. He’s grinning hungrily. “Don’t get confused, Deku. This is a punishment. I’m going to eat you out until you can’t even think about refusing me in the future without getting wet.” 

Izuku hears the words, hears how Katsuki’s voice drops an octave as he says them, but his poor overheated brain doesn’t have the time to compute their meaning before Katsuki ducks down and licks thick and wet through the centre of his folds. Izuku’s groan is echoed by Katsuki’s. Hands come up to hold his lips apart as Katsuki takes a deep breath and gets to work. 

One of Izuku’s hands flies out to clutch the side of the bench, the other curls into Katsuki’s hair. But once they’re there, he doesn’t know what to do. He needs to rip Katsuki away from him. Needs to get away. This is his dad. 

Katsuki's tongue curls around his clit and sucks.

Shrieking, Izuku’s legs curl around Katsuki’s shoulders, pulling him closer. His hand fists in Katsuki’s hair, not allowing him to move away even if he tried. 

“Fuck! Fuck, do that again, da- Kacchan. Do that again.”

“Do that again, please,” Katsuki mocks. Izuku can feel his lips moving against his cunt, ticklish and not enough compared to what he was doing before. 

“Please! Please, do that again.”

Katsuki’s lips curl into a smile and then he’s back, suckling at his clit until Izuku’s legs start shaking. He isn’t ready for it when Katsuki’s tongue turns firm and pushes into his hole. His moans bracket up; this shouldn’t feel as good as it does. 

Izuku only has one moment to realise he’s close to orgasming, tight and warm in his tummy, when Katsuki pushes a finger in and he’s already shaking apart. White flashes behind his eyes and he clenches down so tight that it makes Katsuki swear under his breath.

Finger still inside, Katsuki licks him through it. And then keeps licking, even when Izuku starts wriggling in overstimulation. He pulls back for just a second, only for one finger to become two. Izuku grunts and whines at the stretch as Katsuki’s thick fingers fill him much faster than his own. Katsuki can’t seem to decide where to look, his gaze flicking rapidly between where his fingers fill Izuku and his face, drinking in his reactions, breath hitching when he crooks his fingers and Izuku mewls.

“Shh, shh, it’s okay. That was so fucking hot, I can't wait till you come on my cock. You're just so tiny down here. Gonna have to put some time into stretching you out enough to take me,” Katsuki croons. “Shit, it’s like you’ve never had anything in here before.”

“Haven’t-” Izuku pants. “First time – go slower!”

“You haven't been claimed by an alpha? Didn't your precious daddy help you out during your first heat?”

“My dad?” Izuku’s heartbeat starts rising. He blushes red hot and cringes when he can feel himself get even wetter. "W-why would daddy help?"

"Don't all good sires help their omegas through their first heat? I know it's falling out of fashion, I always thought it was a bit weird too, but then-" Katsuki licks slick-covered lips, he looks starved. "If my omega son looked like you, I wouldn't be able to resist.”

Izuku, like, needs to sit down or something. More than he is already, he means. There’s just so many things wrong with what Katsuki just said. He needs five minutes to an hour to process what he means; he doesn’t think he’s going to get it.

"No?” he says, almost questioningly. 

"Well, he missed out. All the better for me, eh?” 

Already frazzled, Izuku doesn’t have the mental strength to hold in his moans and gasps when Katsuki quirks his fingers, fucking them in and out as his tongue resumes its goal to turn his brain to goo. 

“Too much,” Izuku sobs. 

“You can do it.” Katsuki’s fingers brush against something that makes Izuku’s core turn liquid, legs shaking uncontrollably.

“Da-” Izuku cuts himself off. “Kacchan. There. There!"

“Yeah, feels good, doesn’t it, baby? In the future, you will not deny yourself or me. Understood?”

Izuku bites his lip to stop the instant agreement.

“Understood?” Katsuki bites high on his thigh, fangs hovering on the edge of breaking skin.

Izuku gasps. “YES! Yes, I understand.”

“I understand, alpha.”

“A-alpha.” He feels like his brain is melting out through his pussy. 

“Good boy. Now, let’s see if I can make you cry.”

Three orgasms later and Izuku can’t feel his legs. He thinks he may have started crying, he can’t really remember right now. All he knows is Katsuki. All he feels is Katsuki’s voice, his tongue, his fingers. 

“Damn, baby, I really thought you’d have squirted by now. Gonna have to practise, I guess. I’ll be wringing them out of you in no time, you’ll see. This is a good start though; you’re being so perfect for me.” 

A warm glow lights in his chest. He’s good for alpha. 

He so desperately wants to be good for alpha. His alpha is the best, so he should naturally have the best omega. Izuku wants to be that omega. 

“Bet you’d let me fuck you right here, wouldn’t you?”

He would. Can’t think right now why he ever protested in the first place. 

“Soon, baby. Real soon. Gonna make sure it’s special for our first time. We’re already so off-schedule. C’mon now, come for me, one last time.”

Eyes rolling to the back of his head, Izuku does as his alpha commands. 

“Good boy. So perfect. C’mon-” Katsuki hauls Izuku up in a princess carry, the omega’s legs are obviously too weak to hold himself up- “let’s go shower off. The rest of the team will be back soon and I’ll kill someone if they look at you right now.”

Thankfully, the school has invested in separate stalls in the changing rooms, with lockable doors and everything. Grabbing their clothes, Katsuki hustles them to a shower stall and puts Izuku on his knees. The omega sits on his haunches, gazing up at Katsuki with a soft look in his eyes that makes Katsuki’s heart melt. 

Izuku is so close to a daze. He’s not quite there, but he’s close. The omega makes grabby hands at Katsuki’s shorts, using them to pull him close and then pulling them down. Doesn’t hesitate until he’s got the weeping head of Katsuki’s cock in his mouth, moaning like it's the best thing he’s ever tasted. 

Katsuki’s knees go weak when Izuku swallows around him, throat bobbing around the girth of his cock. He has to lean against the tile wall to stay upright. Fuck, his mouth is perfect. Why haven’t they done this yet?

He can hear the rest of the team filter into the changing rooms. He knows that everyone can probably hear Izuku slurping as he sucks him off. Not to mention the smell of slick permeating the room. 

There’s not a lot of skill involved, yet it feels so euphoric that Katsuki barely lasts five minutes once Izuku’s mouth is on him. But it’s not about that, it’s about seeing Izuku with cum across his face and a glazed look in his eyes as he stares up at Katsuki. It's about how Izuku leans into him as Katsuki showers them off and changes them into their clothes. It’s about walking out with an omega into a locker room of people who would steal Izuku from him in seconds if they could, all while the omega smells and looks like Katsuki’s contended, fucked-out whore. 

Katsuki can’t wait until next time. He thinks it will make an even bigger impression if Izuku has his cum sliding down his thighs. With his skirts, they won’t be able to see it, but they’ll be able to smell it. 

Though, maybe Katsuki will roll up Izuku’s skirt anyway. 

Izuku doesn’t protest when Katsuki pulls him into a relief closet. For once, Katsuki just pulls Izuku into him and cuddles him close until he’s broken his doze. That half-hour is the happiest and most content he’s ever felt and by god is he going to make sure it happens again. 

Already his fingers are tapping, restless, as the craving for Izuku’s honey-sweet slick reignites; just as strong as the need to shove his cock so far down Izuku's throat that it bulges. Izuku had finally capitulated to the need Katsuki sees clear in Izuku’s eyes, which must mean this chase he’s been initiating is finally over. Katsuki had won; Izuku was his. 

So what else would he let Katsuki do?

Chapter Text

Okay, so Izuku might have fucked up. BIG time. 

After the… unfortunate blip of reasoning in the locker room, it’s like some sort of dam breaks. Katsuki is all over him, all the time. And Izuku, shamefully, lets him. 

He doesn’t know what happens, he goes in thinking that today is the day he’ll reject Katsuki and get him to go after Ochako, and then he finds himself in the throes of ecstasy in a relief closet, unable to think past the next orgasm and Katsuki’s tongue on him. Or on his knees, looking up and watching Katsuki fall apart as he shoots down Izuku’s throat. 

Each time, all Izuku can think is… what does it hurt to indulge?

He's already fucked up Katsuki and Ochako’s meeting and nothing he does gets Katsuki interested in her. And now she’s gone and found a different alpha, one completely different. If it's all screwed anyway, why can't Izuku indulge in the little desire that he's always had to hide? Katsuki wants him, and Izuku’s on birth control, what could be the harm in falling just once? Why shouldn't Izuku take what he wants? 

Maybe, by giving in and giving Katsuki what he wants, he’ll lose interest.  

Just do it once, to get it out of his and Katsuki’s systems. Then, Katsuki can get over his strange fixation and try to get Ochako’s attention like he should. Similarly, Izuku can go back to the future and never think of his dad like this again.

His fucking dad. It’s taboo. He shouldn’t feel like this towards his father.

And yet, it never feels wrong in the moment. Not until he opens his mouth to pant Kacchan’s name because it just feels so good, and instead says, “Da-” 

He manages to catch himself in time, but he knows what was about to come out, and it makes it too real. So instead, he’s been going with the much safer, “Alpha,” which drives Katsuki crazy.

Because that’s the thing: it doesn’t happen just once. Nor twice. Not even just thrice. 

By the time Katsuki manages to shove Izuku into some dark corner twice in one day, Izuku accepts that he’s got a problem.

Eventually, as Izuku should’ve expected, Katsuki starts to push the boundaries. He still puts Izuku on his knees, or falls to his own in front of the omega, but eventually it doesn’t seem enough. Sometimes, when he’s fingered or eaten Izuku out to the point of incoherency, he starts rutting between his thighs. The thickness of his cock cleaving smooth and huge through his folds, temptation at its finest. Each time it gets harder for him to push Katsuki away. 

It happens when Izuku’s on his belly, recovering after having Katsuki edging him all day only to come home and make Izuku come back to back to back on his tongue and fingers. They had made it up to four fingers and Izuku is a worn out puddle on the bed. Behind him on the bed, Katsuki still watches every ripple of muscle in his back like a lion before a wounded antelope. 

Too tired to protest, Izuku lets Katsuki fuck between his cheeks. His ass is something the alpha is not quiet about appreciating, and Katsuki has gotten off on this before. Izuku gets too comfortable with complacency. 

That all comes to an end when Katsuki pauses in his rutting to test the push of Izuku’s hole with his cock.

"Kacchan, stop," Izuku demands. "You said you wouldn't."

"I'm not going to, I just want to see what it looks like." Izuku squeaks when Katsuki's thumbs suddenly frame his slit and spread it apart. "It's a good thing we've been fingering you so much. I'm gonna have to spread you so wide before you take me, let alone my knot."

Katsuki feels it when Izuku shivers beneath him. The omega had liked that. Katsuki starts thrusting between his warm folds, steadily getting wetter.

"You’re so wet and eager for it – I'm going to split you apart on my cock, and then break you with my knot. It's such a sweet picture. I'm big, baby. Real big. Even more than you've already taken. It's gonna be a lot but I'll mould your insides to my shape if I have to. You'll be gasping for it, trying to spread your legs wider and wider but it won't be enough to help. And then, just when you think it's over, there'll be the knot. You'll be sobbing by the time I settle it in you, so thick it'll just make you crack a little. You’ll do that for me, won’t you, baby? Go a bit cock dumb, like a good omega. Only able to think about how full you are.”

Izuku’s strung tight beneath him, but Katsuki is drugging himself with his own words. More talking for himself than Izuku, imagining it all. He wants it so bad. Wants to be in Izuku so badly, to fill him up, claim him. 

His cock, drenched in Izuku's slick, knocks against Izuku's slit again, notching in just the slightest bit. 

It would take just one push. One push and he’d be Izuku’s first and only. 

Izuku squirms, fruitlessly trying to get out from under Katsuki's weight pinning him down. "Kacchan, no." 

Katsuki pushes in just the slightest bit. "Just the tip, Deku. Please, just let me feel it. Just a little bit." 

He doesn’t wait for the answer. He does what alphas do: he takes. 

It takes more force than he expected, but the mushroom head of his cock pops past the tight clutch of Izuku's pussy. And, oh god, it’s perfection. His cock is inside Deku. It’s everything Katsuki had imagined and more. It’s a heat-pressure-wetness around the sensitive head of his cock that goes beyond bliss and straight into a different reality of experience. Katsuki comes there and then. 

"W-what?! Did you just come in me? Kacchan, did you just fucking cum in me!?" 

Katsuki doesn’t reply, he can’t hear shit. He’s too busy being propelled to another fucking stratosphere of pleasure. His heart may have stopped beating for a second or two. Surely he’s died and gone to heaven.

All the while, with the extended orgasms alphas were known for, even while unknotted, Izuku is trapped under Katsuki’s heavy weight, unable to shift away or disconnect even as he panics. 

"Oh shit, I can't believe you came in me." And then, quieter and muffled in the pillows, so that Katsuki wouldn't have been able to hear it even if his soul was present in his mortal body, he whispers, agonised, "My daddy just came in me."

Contrary to his whispered horror, his pussy gets even wetter, clenching as it melts around the too-thick head splitting him apart. His hips tilt in an even deeper arch as he tries to present and his mouth parts on a silent scream. If Katsuki had been present in his own body, he might have felt the orgasm for what it was. 

He doesn’t, but he sure does notice when the wetness of Izuku's cunt, the way it relaxes slightly afterwards, the tilt of his hips, means he slips forward just the slightest bit deeper. Katsuki follows the shift of their bodies, lip caught between his teeth. Even though he just came, his balls are tight and heavy.

"Kacchan, get out. Get out!" Izuku groans through the aftershocks of his orgasm. The overstimulation of Katsuki’s cock cleaves through him, spreading him further and in ways he's never been before, catching him in the space between pain and mind-numbing pleasure. 

“Oh fuck. Oh fuck. Your pussy feels so fucking good. Gah, squeeze like that again. Oh, fuck, I need more. Just a little bit more okay, baby?"

Despite his begging for permission, Katsuki never stops moving. A slow, inevitable slide that lets Izuku feel every goddamn curve and vein of his cock. It carves its own, aching, space inside Izuku, shaping territory and occupying every inch until he can feel his pussy throbbing. His mouth bites tight into a pillow over the relentless domination and teary eyes roll to the back of his head. It feels too good. 

"W-why aren't you stopping? You said – said only the tip," he sobs.

Katsuki’s hips never stop moving for a second. It’s a glacial pace, but that just makes it feel even more intense. Every second a new feeling, a new crackle of nerves stimulated as flesh parts at the very core of him, Katsuki’s come mixing with Izuku’s slick to smooth the way. "I've already come, baby. It's too late. Why don't I just feel the rest out anyway? I won't move. But I just want to feel what it's like to be in you while I soften." 

Izuku calls bullshit. Katsuki must surely be overstimulated as hell, but the alpha isn’t acting like it. He’s acting like he hasn't even come yet. Izuku isn’t even sure if he has softened, because if this was what the alpha feels like while soft then Izuku doesn’t know what he’ll do.

But then Izuku realises exactly what is wrong with that sentence: Katsuki is an alpha. Evolutionarily built to come inside an omega and then stay plugged inside until he’s ready to go again. He won’t get completely soft until he is satisfied, especially when he hasn't even knotted. Short refractory periods and resistance to oversensitivity are an alpha’s tools to ensure a proper, thorough breeding.

Katsuki groans: he's just had the best idea. "I'll get you off with my fingers and then I can feel what it's like when you come on my cock. C'mon, it's a good idea. You'll be able to practise taking it for real, and so will I. That way, if I get used to it,  next time I'll last longer. Don't you want me to give you the fuck you deserve? To be able to keep you coming and coming on my cock while I fuck you through it, until you can't even think straight." 

"No, I've gotta get your come out of me." 

Katsuki frowns; that’s the opposite of what the alpha wants. "Just till I go soft. Please, Deku?" He bottoms out with a groan and a little buck of his hips that he’s unable to resist when the head of his cock nudges up against something deep inside that makes Izuku moan and kick out his legs a little. Katsuki is maybe lying a little bit: he won’t go soft as long as Izuku is here with him, but Izuku feels so good that Katsuki doesn’t think he has the mental fortitude to not at least show Izuku how good they feel together when the omega is right there for the taking, turned on and so sweetly taking what he has to give.

It's not like Izuku can deny him, anyway. He loses his words with the final push of Katsuki's hips. His cock so deep it feels like it’s shoving organs to the side to make room for itself. Paralysed and hilted to the brim, instincts taking over and in the prime position for breeding, all Izuku can think about is the cock inside him. All he can feel is the cock inside him. It’s too good to be real, every slight vein and curve light up nerves that make his toes curl, his back bend, his pussy wet. Sweating with how hot and turned on he is. His omega purrs over his accolade in attracting the most perfectly endowed alpha. 

Futilely, Izuku tries to think past the cock that is stretching him asunder, too big and too deep inside. Even the ache feels good, like an accomplishment that he has taken it all and made his alpha proud.

He'd always known his daddy was big. Had been mortified over the recurring dreams he’d had featuring it breaking in his virgin cunt that had him waking up soaked and desperate; dreams a lot like what is happening now. The reality of it feels better than he’d ever imagined. 

He gasps wetly at the realisation that while his daddy has stolen his virginity, Izuku has also taken Katsuki’s. Izuku is his first. 

Katsuki pulls back slightly and it’s like Izuku has surfaced for air after the brink of suffocation. 

"Get it out. Get it out," he cries, thoughts too fuzzy to articulate past that. If he just accepts this, he'll go back down and forget why he absolutely can’t let Katsuki fuck him under any circumstances. He’ll forget why it’s wrong, no matter how good it feels.

But this isn’t his daddy from the future who does whatever Izuku asks; this is Katsuki and he finally has Izuku exactly where he wants him. "You've gotta get used to taking me. This is for your own good, I promise. Look at what you’re like after just having me in you while I’m soft. Can you imagine if I was fully hard? Your cunt needs to be broken in to take me properly, otherwise it'll hurt when I fuck you and I might not be able to knot you. Don’t you want my knot?"

Izuku buries his head in his pillow to silence his desperate objections. Of course he wants the knot. Wants to know how it feels to be stretched out like that, tied to Katsuki in the most intimate way possible, to feel the heat in his belly and know how much his daddy wants to own and breed him–

Against every desire within him, Izuku shakes his head in a ‘no’ he can’t get himself to say out loud. 

Katsuki tuts, scorching hot hands settle on the peaks of Izuku’s hips and grip tight, keeping him in place. “I think you lie, omega.” 

For just a second, deep down, Izuku is relieved; Katsuki obviously isn’t going to let him off his cock any time soon. But then the alpha starts to draw back his hips, withdrawing from Izuku inch by inch. As he does, Izuku panics and instinct takes over. 

Without conscious thought, he gets his knees under himself and presses back as Katsuki moves. His wordless cry gets muffled in the pillow his head is still buried in, cunt clamping tight down on Katsuki, hips thrusting back to get back everything that has been taken from him until his ass meets Katsuki’s pelvis. He squeals at the mind-melting friction, thighs shaking as slick leaks out of his burning hole and drips onto the bed. It’s like he’s forgotten how thick Katsuki is and how taking him quickly when Izuku still isn’t used to the girth is a bad idea.

Chuckling, Katsuki settles himself back where he had been. One of his hands clutches Izuku’s hip, the other pets his aching tummy soothingly, lingering over the curve that he finds there. Katsuki feels his own cock kick against his palm; it’s beyond arousing to know that he’s filled Izuku so completely that it’s visible. “I knew it. What a silly little omega, denying what you so obviously need. But then, I guess it’s the alphas job to make those decisions for a reason.” The hand on Izuku’s tummy slips down to circle around Izuku’s clit, making him jolt as his indignancy for Katsuki’s words is exchanged for the desperate reminder that he needs to come. It seems like a good enough reason to indulge in this madness for a while longer, in Izuku's horny brain. “Just relax darling, you won’t get used to it if you’re so tight.” 

Easier said than done. With Katsuki’s fingers slowly warming him up again, Izuku tries to move as much as he’s able to in an attempt to make the stretch more comfortable. He pops up his hips, spreads his legs; anything to make it more comfortable. "Why are you so big?" He whines. 

Katsuki scent shows his pleasure, like he thinks it’s a compliment. It’s not. Honestly, Izuku would take anything smaller over the monster that was trying (and succeeding) to break his brain and cunt at the same time. 

"Shh, I'll make it all better."

Katsuki’s fingers find Izuku's clit dead centre and he officially loses all higher thought past the need to come.

Izuku comes on Katsuki's cock as the alpha wanted, enjoying the novel feeling of having something to squeeze around as he comes. 

Katsuki shares his pleasure. His hips buck and he groans into Izuku’s ear as they ride out the spasms together. “Yes, just like that. So fucking tight on me, how can this feel so fucking good? No wonder alphas kill for this. God, I never want to leave this pussy. You're gonna have to get used to my cock soon or you're gonna be limping around, ‘cause I’m gonna fuck you open every single day, every minute that I can, no matter what. You were made for me, baby.”

Beneath him, head buried in his arms and pulling his own hair, Izuku cries as he comes the hardest he has ever done so in his life. He barely even comprehends Katsuki’s words, too busy trying not to fuck himself back on his father’s cock as it fully hardens once again inside of him, proving that Izuku does still have space left within him as it expands just slightly further, sending his nerves haywire as it grinds relentlessly against every sensitive point within him, extending his orgasm to the point he feels lightheaded. 

Before this trip to the past, his orgasms had always seemed unsatisfactory, his cunt too empty even as he tipped over that edge. His daddy had never allowed him to get a dildo, and even his Nana didn't dare go against Katsuki in that regard. This entire encounter is beyond anything he has ever experienced. 

By the time he’s finished coming, Katsuki is fully hard once again. He doesn’t seem too upset about it, even starts talking about how they might as well go all the way and fuck for real. But Izuku, blessed with post-nut clarity and starting to feel the alarming stretch of what could only be a knot, finally gets the adrenaline-fuelled strength to flip them over, pull himself off Katsuki’s cock and run away, come dripping out of him. He feels achingly empty, like a part of him has been cored out.

He tries to ignore the feeling that if he had stayed even a second longer, he would have let Katsuki do whatever he liked to him. 

When he gets back to his room, the first thing he does is stand in front of the mirror and pull apart his pussy lips, watching as thick globs of his father's cum steadily pump out of his swollen folds. 

Something inside Izuku fractures, hanging on the very edge of breaking completely.

The second thing he does is finger himself to completion using Katsuki’s cum as lube and then lick the combined taste of them off his fingers afterward, eyes fluttering with pleasure at the taste.

The third thing he does is cry himself to sleep, frustrated beyond belief, because it still isn’t enough to sate the heat inside. 

The fourth thing he does is wake up in the middle of the night and creep out of his room to Katsuki’s, sliding under the sheets and into warm arms.

“Baby?” Katsuki says groggily.

“Shh,” Izuku coos, “Shh, it’s me. I need you.” He turns them so that Katsuki’s on his back with Izuku kneeling over him. A hand down Katsuki’s boxers wakes him up much more quickly. If he’s surprised by Izuku coming to him for the first time, he gets over it quickly; Katsuki always has been quick to press any advantage. 

Pumping him to hardness, Izuku doesn’t flinch when rough fingers slip under his nightdress and straight into the clutch of his pussy where Izuku is wet and dripping. Whatever madness has stolen over Izuku is determined to get what he wants even if it is his daddy underneath him. 

Especially if it’s his daddy underneath him. It’s time that Izuku stops denying that this is what he wants. That Katsuki – his father – is who he wants.

Even with sleep clinging to him, Katsuki is quick to get up to three fingers and that’s enough. The conjoined noises of Katsuki’s fingers in his pussy and Izuku slowly pumping pre-cum over the cock in his hand is so filthy that it makes Izuku glad the room is dark so that Katsuki can’t see how much he’s blushing and biting at his lip. He’s so eager it’s almost humiliating. Izuku might just die if he has to wait much longer. Or, worse, he’ll start to feel guilty. So he knocks away Katsuki’s hand and his reprimanding, “one more finger,” and positions himself over the slick cock pulsing in his hand, so thick that Izuku can’t quite get his fingers to meet and framed by a proportional set of balls. The cock only gets thicker further down at the base, but he refuses to think about that just yet. One thing at a time, he can barely comprehend that it’s going to go inside him at all. 

With the head of Katsuki’s cock at Izuku’s entrance, he leans down to whisper in the alpha’s ear. “Would you still want me, even if you knew you shouldn’t?”

Katsuki’s hands clutch at Izuku’s hips, not moving him but holding tight; perhaps even Katsuki senses that Izuku needs to be the one in control at this moment. “I’d want you even if I knew it would kill me.”

“This isn’t right, what we’re about to do.”

“So be it. If this is wrong then I don’t want to be right. Please, baby.”

“You want me?”

“More than anything.”

Like he could no longer control himself, Katsuki pushes up on his elbows to catch Izuku’s mouth with his. It starts soft and reassuring before quickly turning harsh and relentless. Katsuki’s mouth devours him until he’s not sure where he ends and Katsuki begins. 

Izuku sinks down, just enough to take the head of Katsuki’s cock and gasps. It’s immense and all-consuming.  It’s almost like Izuku had forgotten how large it was in the last few hours. It’s too much. It burns. It’s so overwhelming he wants to cry. It’s too much, maybe. Izuku throws his head back and shudders through it. 

Katsuki gasps. “Fuck, I need to get the lights on. I need to see your face for this." His arms are just long enough to pull the cord for his bedside light. Izuku keeps his eyes closed, red behind his eyelids. While Katsuki is presumably still blind and adjusting to the light, Izuku immediately sinks down another inch on the cock inside him until it’s pressing against something that makes him go molten inside. 

Oh. Oh that’s good. Izuku wants more. 

Hands cup at his face, pulling him forward. “Open your eyes. I need to see you.”

The bedside light Katsuki turned on isn’t very strong, but it paints Katsuki in warm shades of orange and dark shadow. He’s beautiful. Katsuki is looking at Izuku so adoringly that it makes him want to close his eyes again, he looks at him exactly like how his daddy does: with overwhelming love and awe, shadowed with a darker possession and greed. 

A hand holds his. “C’mon, slow and steady. Take breaks when you need to, okay? I’m going to make it feel even better.” Katsuki’s second hand slips down to feel around where they’re connected and then swipes over his clit. Whining through his teeth, Izuku rolls his hips into it, chasing every touch and bucking into the stretch. He’s so full already but he needs more. It’s all he can think about.

Katsuki doesn’t help. “That’s it. You’re doing so well. I can feel you flexing around me, feels like fucking heaven on earth. This pussy was made for me so I know you can do it. Bet not many omegas would be able to take all of me on their first go but you did, didn’t you, baby? Took it all so well, just like a good omega. By the time I’m all in I’ll be knocking right against your womb. I won’t let you run away this time, you’re gonna take my knot; gonna milk me through it all until you're swelling up with my come. You were dripping earlier with just one load, but with a knot or two you’ll be gushing. You want that so badly, don’t you? I know I do. I want to see how full I can get you.” His running commentary of filth makes Izuku shudder around the cock inside him, taking it faster than perhaps he should, if only to hear how it makes Katsuki’s voice stutter and then turn even more gravelly. 

“Just like that. You look so sexy like this, fucking yourself so desperately on my cock, writhing back and forth. It feels good, doesn't it baby? You have no idea what this is doing to me. God, if you only knew what I wanted to do to you.”

Every little increment more inside him feels like he loses just a little more of himself. He’s a tool for Katsuki’s pleasure. He almost feels scared, like he’s losing his sense of self in the realisation that this is it for him. He would never feel this with anyone else. His sense of self twists and he knows he’s starting to get off on this, starting to anticipate the stretch, enjoying feeling something so deep.

By the time Izuku’s bottomed out he’s practically sobbing with need, with the feeling of being almost too full, so close to coming that all it takes is Katsuki leaning forward to suck his nipple into his mouth and he’s gone. 

Cotton in his ears, he hears Katsuki click his tongue against his teeth. “Still haven’t made you squirt properly,” he says under his breath. He’s panting and he clutches Izuku’s hand in his, looking visibly agonised as he tries not to come to the feeling of Izuku squeezing around him. Somehow he still sounds disappointed. “I came out of my mind the first time I was in you.”

“Yeah, I remember. It was only like three hours ago.” And then, because Izuku can’t help himself. “Didn’t even make it all the way in, didja?”

Katsuki doesn’t appear ashamed in the least, like it was only natural to come that quickly when it came to fucking Izuku. Admittedly, the confidence it gave Izuku was pretty staggering. “Fuck, it’s just as good now as it was then. Don’t think I’m ever going to get used to how fucking perfect you are. So tight and wet around my cock. Once you learn to come on it properly, it’s going to feel even better.” 

Izuku clenches around him as much as he can, shivering at the pain-pleasure ache it brings. Fuck, Katsuki is just so fucking big. “That’s if you last long enough to get me off for real this time.” 

Katsuki glares and suddenly sits up completely so that Izuku is sitting in his lap. Izuku buries a scream in Katsuki’s neck as his cock is forced just that much deeper. “Don’t worry, baby, I’m gonna fuck you until you can’t remember your own name, let alone what it was like to not have my cock so deep inside. Only able to scream my name as you squirt around my cock. Your filthy cunt drooling endlessly as you beg me for one more load.”

“Fuck, da- alpha, please. Need you,” Izuku moans, starting to wriggle his hips. He can feel the beginnings of a knot already and he wants it more than he wants air. 

A slap on his ass makes him gasp. “Get going then. You started this; you better finish it.”

“I didn’t start any of this. It’s always been you driving me crazy,” Izuku disagrees obstinately, but nonetheless starts bouncing. The pace is slow to begin with as he settles into the pull and push of having a cock spear into and out of him. The friction and stretch that burns so good. Katsuki goes so deep inside that it feels like Izuku can feel it in his stomach, pushing at organs to carve its own space, and, when he pauses, he swears he can feel the faint, rapid throb of what he thinks is Katsuki’s pulse. 

It lights every nerve on fire: crackling lines of dynamite slowly burning as the flame slowly heads towards a greater explosion, all at once and overwhelming. 

Izuku’s second orgasm has him biting into Katsuki’s shoulder to hold back the scream. He gets no reprieve; Katsuki flips Izuku onto his back with an impatient growl, contorts Izuku’s legs over his shoulders until he’s practically folded over himself, and starts pistoning away. He pants into Izuku’s mouth, his moans just as loud as Izuku’s as he hammers his way to breaking Izuku’s sanity in half. Izuku swears he can feel his cock knocking against his womb, can definitely hear the slap of Katsuki’s balls against his slick covered ass. 

Then Katsuki shuffles slightly and changes his angle so that every thrust brushes against that place inside that lights up every nerve in Izuku's body. “C’mon, baby, one more time. One more time, for me.”

Above their heads, Katsuki changes his grip to hold both of Izuku’s hands in one of his own and rubs his thumb against Izuku clit with the other, making small circles, all while thrusting away so hard that Izuku’s amazed the bed isn’t breaking. Katsuki’s knot is filling out, Izuku can feel it tugging every time he pulls back, the resistance when he pushes. The pop and wet squelch every time Katsuki grinds it in with aborted little swivels of his hips against his g-spot that make Izuku fucking sob. Already, the stretch is immense and Izuku cannot comprehend that it’s going to get bigger inside him, yet wants it so desperately. Even as it keeps swelling and swelling far past the point of comfort as Katsuki relentlessly drives it past the resistance of Izuku’s cunt.

His stomach winds tighter and tighter, more than he’s ever felt, so intense it’s frightening as he hurtles towards his orgasm. Izuku can’t get his mouth to form words, but if he could he’s pretty sure he’d be saying, “Stop, I’ll break.” He’s crying, face screwed up and unattractive, old and new tears staining his cheeks, clawing at Katsuki until the alpha has to hold down his hands with his own, and yet Katsuki looks at him, unblinking, face lined with desperation, like it’s all he could ever want. 

The tension in Izuku's body reaches a crescendo – and then releases all at once. 

The next time the knot fucks in, Izuku shatters apart as he comes and then keeps coming. His eyes roll to the back of his thrown-back head. Back arching as he falls apart to a litany of Katsuki’s fevered praise. Underneath him, the sheets stick to him, sodden and filthy.

Katsuki actually made him squirt.

“Yes! Just like that. Keep squeezing just like that,” Katsuki growls into his neck, sucking and biting marks so close to Izuku’s scent gland that it makes the hair on the back of his neck raise. “Fuck, I’m coming!”

Izuku whines, the faintest hint of panic clawing at him as the knot pops in one final time, swelling more and more to the point of pain as Izuku futilely tries to clench around the too-wide mass splitting him apart. It feels like he'll burst. It’s far too much, far too fast. Until, at the last moment, just before he breaks entirely, something deep inside him surrenders and locks down tight around the knot, seizing around it so hard Izuku thinks he blacks out for a second. The pressure in his cunt inescapable against his g-spot as Katsuki’s comes with a roar, clutching Izuku tight and futilely trying to fuck his hips in further. His come fills Izuku, hot, thick, endless and sating instincts he’s never felt before as it shoots inside him, deeper than even Katsuki's cock can reach. Right into his womb, where it should be, so that daddy can breed him full. 

The red-blooded desire that curls through him at just the thought makes Izuku’s toes curl, mouth open in a silent scream as his cunt clamps tight. Encouraging heavy pumps of cum from the knot as he milks the knot for all it can give him as his own come splatters against Katsuki’s pelvis. Above him, crooning encouragement and dripping with sweat from his temples, Katsuki grinds his hips as much as possible with the same goal.

Izuku thinks something inside him breaks entirely. He thinks it might be his self-restraint. It might just be his sanity. 

This is his daddy; he should feel guilty or ashamed, but he doesn’t. Instead, that thought just makes him feel even hotter.

In the knot-locked aftermath Katsuki is careful in pulling Izuku’s legs off his shoulders, kneading the muscle to help the ache he already feels there. He pulls Izuku close and nuzzles into his neck, purring like a goddamn chainsaw in his contentment. Kisses Izuku everywhere he can reach and then comes back to his mouth like he can’t get enough. The pace is less frantic but every deep lick and suck feels like it takes a piece of Izuku’s soul. It doesn’t help that Katsuki keeps rolling his hips as much as he’s able, fucking his come deeper as he comes and keeps coming. A hand on the new curve of Izuku’s tummy where he feels so full. Katsuki won’t stop coming until the knot unlocks and that's impossible to predict. It could take hours.

Stuck underneath him, Izuku’s mind goes numb in favour of overwhelming pleasure. The only coherent thought he has is that he just fucked his fucking dad and he already can’t wait until they do it again.

Oh he’s so totally screwed. There’s no coming back from this. 

Maybe it’s time he stopped trying. 

When the knot starts to deflate, Izuku starts wriggling around, complaining about oversensitivity. Katsuki’s a little disappointed; he'd wanted another round before Izuku inevitably turned skittish again. The omega coming to him had been the stuff of dreams, but Katsuki doesn’t anticipate it lasting long. Izuku keeps flipping back and forth between pulling him in and pushing him away.

When Katsuki pulls out, he leaves a little gape for Izuku to remember him by when he inevitably runs away to sleep alone, aching and empty and pretending like he hadn’t instigated what they just did. A gape accompanied by a pussy full of cum that was quick to follow his cock on its journey out. Thick white gathers at Izuku’s sodden hole and quickly cascades down his thighs. 

And here Katsuki had thought Izuku’s thighs couldn't look even more fuckable.

Now that was an idea… 

"Deku, clench your thighs together for me. I've had an amazing idea." 

If Izuku does run after this, Katsuki will just chase him down. He refuses to give this up, not for anything. But until then, he’s going to milk this for all it’s worth. 

Literally.

Chapter Text

Health class is… different in the past. 

Safe sex is very highly valued, and the teacher goes into excruciating detail about every single sex act and how to perform it properly and protected alongside demonstrative clips that can only be classed as porn. By the time she’s done, Izuku is shifting in his seat and he’s not the only one. 

Katsuki’s hand rockets into the air as soon as she opens the discussion to any questions the student’s may have. He doesn’t wait to be picked before calling out his question.

“Miss, is it true that non-pregnant omegas can be made to lactate?” 

Like his intentions aren’t obvious enough, Katsuki sends the filthiest leer in Izuku’s direction who shivers at the look in his eyes. Izuku shifts in his seat, throat dry as he tries not to imagine Katsuki suckling at his breasts, groaning in ecstasy as Izuku shares with him something that’s meant for their pups.

What the fuck is wrong with him? Ever since the night that Katsuki stole his virginity, it's like he can't get his mind out of the gutter.

Needless to say, Izuku has not made much progress in rejecting Katsuki since then. In fact, from the amount of times he's been knotted in the last couple of days, he's probably doing even worse than before. But it's like he can't stop. 

Worse, it's like he doesn't want to. 

He shakes himself out of his ridiculous thoughts just in time to hear the teacher’s response. 

“Yes, however, it heavily depends on a variety of things. It takes time, patience, alphan pheromonal strength, compatibility, and can often only happen at certain times of an omegas cycle. For example, some omegas will produce milk during their heat, as a way of soothing and calming particularly… demanding rutting partners. It can be stimulated by an alpha rubbing their ejaculate into the areolas, which sometimes can trigger a hormonal reaction. But like I said, it takes time and repeated–”

Izuku is no longer listening. He’s sweating too hard, pussy uncomfortably wet under his skirt as Katsuki tracks him growing lust plain on his face. 

Katsuki sniffs, and Izuku knows it’s all over. He’s got him belly down on a desk before Izuku can even comprehend. 

"Bakugou Katsuki, what do you think you're doing?" The teacher screams, and Izuku thinks someone is finally on his side. "No sex in the classroom! Take him outside."

"But Miss,” Katsuki honest to god whines, “we'll miss class, and this is important. Can I at least bring him back in once we've knotted? I’ll make sure he’s quiet and everything." 

Her eyes soften. "You're such a good student, Bakugou. I wish you could, but the new law changes mean that couplings cannot happen in the classroom itself. It's stupid and discriminatory, it just means alphas and omegas all miss class occasionally, but there's nothing I can do about it.”

“Urg, fine.” Katsuki hauls Izuku over his shoulder and leaves.

“Come back to get your homework, boys!” The teacher calls after them. 

Thankfully, there’s a relief room right next to the classroom, otherwise Izuku is pretty sure Katsuki would have shoved his cock down Izuku’s throat there and then against the classroom door. As it is, he gets them in the privacy and comfort of the room before putting Izuku on his knees on one of the provided pillows. 

Izuku doesn’t try and fight it. He opens his mouth and suckles at the head of Katsuki’s cock, precum salty and perfect on his tongue. He needs this too. He’s so damn wet just from the thought of Katsuki coming on his tits, getting them to swell under the demand of the alphas will. Of the first drop of milk, and how he imagines Katsuki’s eyes slitting at just the smell, feral for a taste, and then so docile and happy once he gets his mouth on them. Purring, mouth wet and warm, suction so tight and arms around Izuku’s waist holding him still as he tries to get every last drop Izuku can give him, and then moving on to the next once he’s finished with the first. Maybe he'd keep his cock warm in Izuku while he suckled, idly thrusting as each suck makes Izuku clench down on him. 

Izuku keens; it would feel so good. 

Katsuki must be thinking something similar, because Izuku’s only just got his cock deep in his throat when his balls draw up tight, his eyes hooded. At the last moment, he pulls out with a terse, “Pull up your top, baby. Gonna get you nice and wet.” 

Panting, drool and pre-cum smeared around his mouth, pussy throbbing, Izuku pulls up his top and bralette as quickly as possible, baring his chest and pebbled nipples. “Here, alpha, please.”

“Fuck yes, you’re going to give me exactly what I want, aren’t you, omega?”

“Anything for you, da- Kacchan”

Katsuki comes, ropes of come spilling across Izuku’s chest and neck as Katsuki fists his cock, making sure it lands where he wants it to. “God, you look so good like that. Why haven’t I done this yet? You smell perfect just like this.”

All Izuku smells is the overwhelming pheromones of Katsuki’s come. 

As soon as he’s finished coming, Katsuki pushes Izuku on his back, kneeling over him as his hands rub the come in. “Lay back, overwise it’s all going to run off.” He tweaks Izuku’s nipple and laughs when he twitches. “You like this a lot, huh? You’re already so sensitive here, can you imagine what you’ll be like when these start leaking?” 

When, not if.

Izuku wants to move his leg up to brush against Katsuki’s still hard cock and taunt him about not being the only one who’s far too into this. Instead, he spreads his knees as part as far as he can go. The air is cool on his cunt, still slightly loose and gaping after Katsuki held him down and knotted him that morning before school, but even that feels good. “Kacchan, need you inside.”

Katsuki glances down. “Shit, you’re so wet for me. Need my cock that bad?”

“Mmm!” Obviously, shithead.

“Okay, but anything that comes out goes straight on your tits, got it? No whining about feeling empty.”

In the aftermath, cum drying on his tits, Katsuki still playing with them and discovering all new ways to make Izuku shiver on the knot shoved in his cunt, Izuku’s pretty satisfied with the situation.

“You’re so sensitive, Deku. Pretty sure you came because I was playing with these–” Katsuki flicks a nipple and watches how it makes Izuku’s hips move instinctively– “instead of because of my knot. I’m almost insulted.”

Izuku wasn’t listening. Katsuki talked after sex for himself; Izuku was always far too fucked out to fully listen.

“I wish we could go back to the old times so I could sit you on my cock during class. All these new rules are fucking barbaric. It’s downright impossible to sit through class when you’re right there. I mean, what else am I meant to do if I get hard during class? Can you believe that my dad says there's a faction of betas that are trying to put even more rules in place to prevent alphas and omegas seeking relief from each other in public at all. No more relief closets. It'll never pass of course, not when there's no good way to stop the need, but can you believe betas would try and control our actions like that?”

The bell went. “Fuck, we’re going to miss English.”

Mitsuki is the first to notice. She sniffs one day at dinner and then spears Izuku with her eyes. “You’re going into heat.”

“He is,” Katsuki affirms. His chair is so close to Izuku’s that they’re practically sitting on the same seat. The fact that his nose is practically shoved into Izuku’s hairline does give the impression that he’d be the first to know. Why he hadn’t brought it up is another matter.

“I am?!” Izuku exclaims. He seems to be the only one surprised. 

“You are. I wasn’t sure yesterday – what with my son practically spraying you in his scent like a skunk – but I’m sure now. Time to get to your nest.” Mitsuki shoves a hovering Katsuki forcefully out of the way and points at him with a severe expression. “Stay.”

Katsuki snarls unhappily at her, but stays behind, branding a spot into the back of Izuku’s neck with his stare as Mitsuki leads him away.

Meanwhile, Izuku is on the verge of hyperventilating. Suppressants haven’t been invented yet in this time period and he has never gone through heat unsuppressed. Not since his first one, where all he remembers is writhing in agony and begging for an alpha that wasn’t there. His nest cold and empty while his daddy was in fucking Paris for a meeting.

He’s going to have to go through this one without suppressants, without sex toys, and without an alpha. To use Katsuki’s phrasing: like a fucking barbarian. 

“What about school?” he asks Mitsuki. In his own time, the combination of suppressants and scent blockers meant omegas could still attend while in heat. Katsuki normally takes Izuku out for the entire week anyway and has him home-schooled over Skype so he doesn't fall behind, but that’s just daddy being daddy.

He honestly can’t tell if he’ll still be forced to go to school while smelling like he needs sex to survive. After the last few weeks in this time period, it wouldn’t surprise him. 

“You’ll take the week off until it breaks, of course.”

Oh thank fuck. 

Mitsuki leads him into his room and then disappears and returns with armfuls of nesting materials and bottles of water. She shows him how to deadbolt the door and tells him not to open it for anyone but her, as she’ll make sure he’s fed and cleaned. Last but not least, she gives him a new dildo in its package and a book with a shirtless, muscled man and very curvaceous smaller man twined together on the front cover and leaves before he can get himself together. 

Flushed from both embarrassment and encroaching heat, Izuku sits on his bed and starts cursing out every god he knows the name of. Then he cracks open the bodice-ripper and gets reading. 

By the next morning, Izuku is full on sweating as his heat approaches on swift heels. There’s an itch he can’t scratch and it's driving him crazy until every little thing makes him frustrated. He can tell that within a few hours he’ll be in the thick of it. 

Outside his bedroom he hears a clatter. “Bakugou Katsuki, stop hovering outside his goddamn door and go to school.”

“But, ma-”

“No. He hasn’t asked you to stay with him, which means you can’t go in.”

“He wants me there.”

“Has he asked you?”

“...No.” Even through the door, Izuku can imagine the grumpy look on Katsuki’s face.

“Go to school, Katsuki. I’ll drive you there on my way to make sure.”

“You’re leaving him?”

“Believe me, he doesn’t want a witness for what comes next. He’s got what he needs and there’s an en-suite in his room. He’ll be fine.”

Izuku hadn’t thought Katsuki would want to spend his heat with him. It was quite involved to spend a heat with an omega. Now he knows Katsuki wants to be with him, he weighs his options: to go through this alone, or to have Katsuki with him.

In a moment of insanity, he opens the door.

“Kacchan?”

There’s no answer. When Izuku unlocks the door and pokes his head out, the corridor is empty. They’ve gone. It should be a relief.

Frustrated as the itch kicks back in but worse with just the lingering sweetness of Katsuki’s scent, he storms back to his nest.

He forgets to lock the door. 

Fuck being an omega, it fucking sucks. Nothing is worth this. How come betas get off scot-free while Izuku is here, fucking himself with a dildo that is doing exactly nothing to take the edge off? 

Why isn’t his alpha here? Izuku hasn’t been abandoned, the omega is far too secure to ever think so, but he is very confused and very annoyed that his alpha with his lovely throbbing cock and delicious cum isn’t here when he needs him. The alpha hasn’t stopped trying to have sex with him over the last few weeks; why is it that when it’s Izuku who needs him, he’s not here? It's infuriating.

There is a part of Izuku who knows it’s because he didn’t ask Katsuki to stay and help him through this, but that part is buried under the overwhelming need and demands of his instincts. Heat isn’t for higher thinking; heat is for breeding and making babies and he can’t do that on his own. 

Izuku is on all fours, fucking himself back on the measly dildo, practically crying with need and frustration, when he feels body heat behind him. 

“That little thing doesn’t look like it's doing much to help. Why don’t I take over?” Katsuki says. He draws the dildo out of Izuku with a wet suction noise and throws it across the room. It had been doing fuck all to help but Izuku cries out with the loss anyway. 

“Kacchan?”

“Shh, it’s okay, I know you want me here. You were chanting my name – I could hear you all the way from downstairs. Sorry I wasn’t here earlier, baby. The hag made me leave before I could come to you.”

Izuku doesn’t really give a shit about his reasons as to why he’s in his nest without Izuku’s permission, to be honest. Words mean nothing to him right now, all he knows is that Katsuki is here and he can finally do his job and fuck Izuku into a cum-filled puddle. 

Katsuki evidently agrees; he flips Izuku onto his back, revealing Katsuki in all his naked glory. There’s a part of Izuku that wishes he got to watch him undress, the majority is just pleased that the alpha is finally sensing the urgency of the issue. 

But then Katsuki pauses.

“What a naughty omega. Putting something other than your alphas cock in your pretty little pussy, stretching it out before I even got here. This–” Katsuki swipes his fingers through Izuku’s sodden folds from clit to slit, soaking his fingers in slick and making Izuku twitch– “is mine. What do you say after touching something that isn’t yours?”

“Sorry, Kacchan.”

Katsuki starts using his wet hand to slowly jerk himself, his cock plumping up quickly from the strokes. “I’m afraid that’s not good enough. How many times did you cum without my permission?”

“None!”

Katsuki hums. “Well, I suppose that’s something at least. But you’ve still displeased me.”

“I’m so sorry. Please, I’ll be so good for you. Just need you inside-”

“See, the thing is, I want your full submission, De-ku,” Katsuki interrupts, eyes slitting as he too starts to react to the pheromones Izuku is pumping out.

Izuku hiccups a whimper. “You have it, alpha.”

For most, that would have worked. The majority of alphas get off on their omegas addressing them as such. It was the ultimate sign of submission, as it recognised them at the top of the hierarchy in their play. Not just an alpha, but their alpha. 

The thing is, Katsuki doesn’t just want Deku’s submission, he wants Deku’s everything. And he has the feeling that for Deku, specifically, there is another title he subconsciously associates with the top of the hierarchy. The most dominant; the one who makes the decisions and leads; someone so domineering and overprotective, who had held Deku’s hand for his entire life and would continue to do so in the future. Katsuki wants that title. Wants to take it and replace the current holder in Izuku’s head, the one he was so wholeheartedly devoted to. He has for a while and he knows that with Izuku in heat, he’ll be able to get what he wants.

“I think you lie. I think, for you, ‘alpha’ is not the title you’d give to the person in your bed. No, I think it’s something else.”

“I don’t know what you’re talking about.” For a second, even through the heat, a hint of defiance enters Izuku’s eyes and Katsuki leaps on it.

“You know exactly what I’m talking about. You probably haven’t noticed, but there’s something I keep hearing you muttering to yourself when I get you real worked up. When you’re too fucked out to keep it in.”

Izuku shakes his head. “No, I–”

“You called me ‘alpha’ far too easily for it to mean what it should. I’m not stupid, I know you’ve been holding out on me. Do I need to fuck you stupid before you say it? Lay you out on my lap and spank your ass red until you ‘fess up? Eat you out, never putting anything in your greedy cunt, until you’re sobbing and too overstimulated to take anything anyway? I’ll do it, Deku. You know I will.”

“No, alpha, please.”

“Nu-uh, what should you be addressing me as?”

“Alp-”

“Deku, I’m not going to fuck you, let alone give you my knot, until you give it to me.”

Izuku’s chest heaves under the force of his breaths, tears trickling out from the corners of his eyes. For a second, Katsuki thinks he’s not going to break. Or, at least, break in the wrong way. For a second, he thinks he might have gone too far. 

A whimper. Hands curl into the bed. “Daddy.” Izuku’s voice cracks on his whine as he starts sobbing. He looks at Katsuki like he’s a fucking god. 

It’s the most beautiful thing Katsuki’s ever heard. He groans and finally sinks in, electrified up to his ears with sheer elation. “That’s right, call me daddy, slut. I promise that your cunt is going to be wetter with my cum than your slick by the end of this.”

Their first time is fast and brutal. Both of them are too affected by the heat and worked up to last long. That’s fine though, Katsuki’s got a week to do all the things he’s been planning. 

Before he pulls out, Katsuki rearranges Izuku onto his back and places a new, clean pillow under his lower spine. He folds Izuku until his knees are up near his head; his cock gives a valiant twitch at how easy it is. “Keep your legs up like this.”

“Why?” Izuku moans as Katsuki pulls out with a wet noise. Despite his obvious confusion, Izuku does as he’s told and Katsuki purrs at the image he makes, eyes fastened on the mess he's made of Izuku's pussy. Maybe it’s a bit underhanded but he'll take whatever means possible to tie Izuku to him, even if it means fucking a baby into him. Normally it was alphas being baby-trapped by omegas or betas instead of the other way round, but Katsuki wasn't going to dismiss the method just because of that. Katsuki is nothing if not a feminist.

Izuku may be in heat but he isn’t dumb and it’s very obvious what this position is for, even he can't be that oblivious, so he must realise what Katsuki was trying to do. Yet, he obediently keeps his legs up anyway. 

“Alpha is weird,” Izuku mutters. Katsuki clicks his tongue and Izuku is enough of a brat to roll his eyes. “Daddy is weird.”

Maybe in the future, Katsuki should invest in stirrups or ropes so he can hold Izuku in the exact position he wants to. Physically tied to his bed and unable to leave.  

Hard again, he fucks back into Izuku’s loose hole with a loud squelch he revelled in, knowing it came from having so much of his come inside. 

“Gonna be such a good dam, aren’t you, Deku. I’ll have to get a nanny to look after the kid while you look after me just like this. No way am I letting our brat steal your attention from me.”

When he looks up, expecting some sort of reaction, he realises that Izuku has passed out. Katsuki shrugs and doesn’t stop. The omega will sleep better with a knot inside, anyway. 

Katsuki perhaps loses his head just a little bit the longer he’s subjected to Izuku’s heat pheromones. To be fair to him, this is his first time sharing a heat with an omega. Moreover, he’s trying to make sure he manages to knock him up in the time he gets with his fertile little mate. 

Izuku's parents will be coming home soon, which means that Izuku will no longer be living with Katsuki in his house and he doesn’t think he’ll be able to take it. Not after having access to his omega 24/7. He doesn’t think he’ll be able to sleep without Izuku, let alone relax. 

What if Izuku’s unworthy parents don’t approve of Katsuki and then try to take Izuku away? Katsuki can’t risk it. He needs to make sure Izuku is his. And if the omega is going to refuse a bite, there’s only one way to do it. 

Admittedly, Katsuki would’ve been trying to breed Izuku tight little cunt anyway, but this was just extra incentive. 

Katsuki made sure to keep his omega’s hips tilted, just like all the books advised. He made sure to knot his omega for as long as possible and keep him plugged on his cock, even while sleeping. And whenever they showered, Katsuki was quick to replace whatever was lost.

As the heat wore on, Izuku would sometimes make urgent protesting noises once the knot locked. It was always a bit much for the omega, but it's not like Izuku could exactly do anything about it anyway. Katsuki was quick to sooth him into compliance on his cock. 

It took three knots back to back for Izuku to not heed Katsuki's word. 

To be fair to him, Izuku's tummy was looking pretty bloated, but Katsuki hadn’t been exaggerating when he said his knot was thick and balls heavy. Over the years, locker rooms of flaunting alphas and betas had shown him that he was always the superior alpha. Not to mention that his alpha was very keen to breed this omega. It wouldn't surprise Katsuki if his knot flared up more and more the looser Izuku got, forcing his cunt to keep the maximum amount of cum in there.

Maybe if Izuku wasn't as small and tight as he was, some might have leaked out and given him relief. But Izuku barely came up to Katsuki's sternum and was half his width: his pussy was too small.

No, that was wrong – his pussy was perfect. Izuku just had to power through. 

Still, three knot-loads seemed to be his limit. It was an awfully small amount to Katsuki. He was the best alpha, providing all this virile come and he knew he could keep going. As the best omega—which, as his omega, Izuku surely was—Izuku should be in raptures over receiving it. Not complaining and wriggling around; didn't he know that would just make it worse?

In the lead up to Izuku's heat, researching the most effective ways to guarantee your omega gets pregnant, Katsuki had read that some omegas need to be broken in just a little during their first heats to accommodate an alpha, pushed past the point of discomfort until the fullness triggered their breeding instincts and they only felt the pleasure and desire for more. He'd thought Izuku wouldn't need that, but it seems he was wrong. A shame for Izuku, Katsuki would prefer not to have to cause any significant discomfort, but he would do what needed to be done for Izuku's long-term benefit. 

"Kacchan, it's too much," Izuku cried when Katsuki's cock gave another extended spurt.

Katsuki softly rubbed against the swell of Izuku's stomach. "Shh, it's okay. You're being so perfect for me. Look at this, you're taking it so well." 

Izuku shook his head "I'm so full." He wriggled in place and then did it again. 

Katsuki tried to stop him, unsure what exactly Izuku was trying to do—it wasn't like he would ever be able to pull off of Katsuki's knot, but Izuku refused to be soothed. 

The wriggling got more urgent and Katsuki didn't think Izuku realised it but it was making his cunt do interesting things over his cock. Maybe Izuku was knot-dumb because he actually started to try to pull himself off Katsuki's cock. 

He managed a fraction of an inch when Katsuki simply bucked his hips and pulled him back by the drag of his knot. "Don't be stupid, that's never going to work." 

Izuku wasn't deterred. He tried again, wiggling and bucking his hips in an attempt to prise himself off the plug. He didn't seem aware of his own shallower breathing and how his cunt clenched and flexed as he basically rocked himself back and forth on the thickest part of Katsuki's knot. Katsuki noticed. 

Izuku's rim strained around the curve of the knot and agony lanced through him at just the beginning of it spreading his hole, but he was determined to follow through. His rim stretched beyond capacity, a trickle of cum escaped his hole, and he felt the beginnings of triumph. 

"No."

Katsuki pulled him back by the hips, forcing his cock as deep as it would go. He changed his grip to Izuku's ass to spread him wide and pressed his pelvis as tight as possible. Just as Katsuki had hypothesised, his knot flared ever so slightly bigger, refusing to budge even an inch as it brutally pressed on Izuku’s g-spot with overwhelming pressure. Izuku cried out, almost seeming like he might start trying to crawl away. 

Katsuki didn't even need the lock to come this time, he always had the last, but Izuku's cunt obediently worked over him in renewed enthusiasm anyway and he let it milk him for the fourth time, body going lax with intense bliss even as Izuku cried and writhed above him. Katsuki would've felt concerned if it weren't for the splatters of come drenching his hips as Izuku comes with a wail, insides spasming around his cock until Katsuki was convinced he'd reached nirvana.

By the time Katsuki finished his first, most intense, orgasm, Izuku was unconscious. Tears glistened on his cheeks and a hand protectively rested on his swollen stomach even in sleep. He looked pregnant already and it sent a thrill of success through Katsuki. There was no way his omega would ever be able to leave him after this. Even if he wanted to, once his pregnancy was confirmed, the law would force Izuku to marry him. 

Eyes alight with victory, Katsuki thrust through his own overstimulation, instincts demanding to add at least one more load to make sure, riveted by how every push made Izuku’s swollen stomach shift slightly. Despite Izuku’s tears, a fresh puddle of slick had gathered beneath them and it continually dripped from his thoroughly broken-in pussy. Katsuki's mouth watered. His knot pulsed strongly and he could see in real time as Izuku’s stomach, just very slightly, expanded.

"That's why you don't try and force yourself off a knot, idiot."

Still, he kind of hoped Izuku would try again anyway.

Izuku’s omega is very happy with how this heat has been going. He aches with how perfectly full Katsuki keeps him, stomach and cunt swollen from how relentless his alpha has been. And though he might just die on Katsuki’s knot, what a way to go. 

Katsuki keeps up with his voracious appetite for sex without even blinking, never tiring, never pushing Izuku away because it’s too much. Not even when Izuku wakes him up already bouncing on his cock; no, instead, Katsuki just slaps his ass and tells him to go faster, squeeze tighter, and “If you want a knot, you’re going to have to work for it.”

Then Katsuki pays back the favour and fucks him into a blackout so he wakes up with Katsuki fucking into him. 

The only thing that seems to annoy Katsuki is the fact that every time he tries to bite Izuku, the omega pushes him away with a hiss. It should be because the very small, sane part of Izuku that still has a tiny iota of control knows he definitely can’t get mated to Katsuki in the past, but it isn’t. 

“Daddy hasn’t finished his courting,” Izuku’s omega obstinately denies. “Hasn’t earnt a bite.”

Slamming into Izuku from behind, where he’d hoped the omega wouldn’t be able to tell until it was too late and Katsuki already had his fangs in him, Katsuki snarls. “Fucking hell, what else do you want me to do, I’m already trying to fuck a baby in you. What else do you need to finish this courting?”

If Izuku had the ability to turn his nose up while being fucked into a mattress, he would: Alpha wouldn’t be able to breed him so the point was moot. Alas, he has to settle for conveying how unimpressed he was via tone. It probably didn’t work, what with how every word was interspersed with breathy moans. “Daddy didn’t even help me make my nest.”

Katsuki groans. “I couldn’t, baby. The hag locked you away.”

Izuku shrugs, unconcerned. That’s not his problem. His daddy, the one Izuku’s omega was waiting for to mate him for real, would’ve found a way. 

“So fucking stubborn.”

It’s okay, the omega isn’t cruel. He makes sure to massage his alpha's cock as he comes, despite how full he is already, milking him for as long as possible while Katsuki sulks in the aftermath. 

In Izuku’s saner moments, when he regains a faint bit of lucidity and fuzzy memories of his dips into heat, past the embarrassment of how he’s been acting, is confusion. Every time Katsuki pulls out, he gets Izuku to tilt his hips up until Katsuki is ready to plug him up with his cock and knot again. The omega part of him delights in it for some reason, understanding the aim intrinsically. Izuku just presumes Katsuki has a come kink and likes seeing him full; he talks enough about it after all and never once lets Izuku try to empty himself. 

He also seems to have a pretty strong breeding kink. What's worse is that despite knowing he’s not ready for kids and is incapable of having them at the moment, Izuku also seems to find the idea of it pretty hot. Because he keeps finding himself squirting while Katsuki mutters about how beautiful he’ll look, round with Katsuki’s claim. Barefoot and pregnant and locked away in Katsuki’s house until he’s ready to pop, the alpha providing for every hormone-driven need before it ever even arises. The alpha always looks a little unhinged as he goes off on these tangents and Izuku is so embarrassed by how it makes him gush slick. 

(Under the skin of Izuku’s bicep is the tiny implant his daddy took him to get once he presented. He’s so secure in the knowledge that he can’t be impregnated that Izuku forgets that this Katsuki doesn’t also have this knowledge.)

(.... This is knowledge that Katsuki would probably find quite important.)

Knotted deep and still throbbing with release, Katsuki takes the time to play with Izuku’s tits. He grins ferally every time it makes Izuku shiver both externally and internally. Izuku whines: he’s tired and wants a nap in his daddy’s arms but Katsuki seems way too excited to allow for that.

“I wonder if these will swell up for real soon. It’s kind of a shame, I wanted to see if I could make them do it myself. You’ll be fat and leaking from more than your pussy –  I can’t wait. I wonder if your milk will be as delicious as your slick.”

Some of the things Katsuki says should be illegal. Izuku groans at the imagery. He wishes he had milk to give Katsuki right now; he pants as he imagines Katsuki suckling at his chest as he gushes with milk under his alphas demands and how docile the alpha would be. Maybe it would calm Katsuki down a little bit and give Izuku a little bit of rest from this marathon of debauchery. 

Shouldn’t Izuku be the insatiable one when he’s in heat? How come it feels like Katsuki’s the one enjoying himself the most?

“Where’s your mind at, baby?” Katsuki’s mouth attaches to one of his nipples and Izuku cries out, hips jerking. It pulls at the deflating knot, pressing it right against his g-spot and just like that it’s like he can’t stop. He wants his knot back. “That’s right, focus on me. You want to stay plugged and perfect for me, don’t you?”

Izuku nods frantically. “Yes, yes, daddy please!” Izuku scratches at Katsuki’s shoulders when he hits just the perfect angle so that every movement presses with perfect accuracy against his g-spot. Moaning in tandem, Katsuki’s hands squeeze his hips and help direct him as he undulates above him, mouth attached to his chest and then neck when the angle is too strained to hold for long. 

Every nip and suck makes Izuku tingle all over. He knows he’s already covered in marks, from his neck to his chest, his hips, thighs, and his ass. He delights in the new ones Katsuki sucks high on his throat, where no collar could possibly cover them. Katsuki’s covered in a bloom of matching colour across his neck and a multitude of scratches across his back and sides. Izuku watched him admire them in the mirror when he left the nest to clean and feed them: Katsuki preens every time he sees them. 

“Gonna be the perfect dam. All round and perfect and mine,” Katsuki jerks his hips up, meeting Izuku’s movements with his own until their hips are pounding together wildly. “No one else can make you feel like I do. I’ll kill anyone… I won’t ever let anyone else even see you like this, all spread wide open and loose for me, like a proper little slut. I’m the only one allowed to touch you like this. To fuck you like this. You’re mine.”

Izuku comes first, biting new marks into Katsuki’s neck to muffle his scream, and Katsuki follows with his head thrown back in a perfect arch, mouth wide open on a silent roar. He’s so perfect. Izuku wishes this would never end. 

In the sleepy aftermath, knot buried deep and heat finally broken, they drift off to sleep with Katsuki’s hand possessively draped over Izuku’s stomach.

Chapter Text

The fact that Katsuki had been there for the entirety of his heat meant that Izuku hadn’t fallen so deep into his instincts that he was actually able to remember quite a bit of it. Some of it is hazy, but it still makes him want the earth to swallow him from embarrassment. 

And yet, on Izuku’s first day back to school after his heat, he doesn’t make it to any of his morning lessons. 

Instead he’s got his back against a wall in a relief closet, his knees over Katsuki’s elbows holding him up, and is getting his back blown out all over again as if he didn’t ache enough after the weeklong marathon he’d just been subjected to. It’s like his body has been conditioned to react to Katsuki’s desire. 

“We should go, Kacchan, we’ve got-” teeth nip over his scent gland, and he momentarily loses focus entirely. “We’ve got… classes.”

“Fuck class. I’ve got the top grades in the year and a job lined up with my dad when school’s over. I’m a sure thing, baby; I’ve got the best goddamn prospects in this shitty town. You don’t need to go to class, or to school at all. I can look after you.”

Involuntarily, Izuku sees his father in his mind. The one that wore Daibaku -branded suits and rolexes and who commanded every room he stepped into, even over other alphas. The flash of his cufflinks when he spoke with his hands, the hard edge of his rings when he took Izuku’s hands that juxtaposed with the gentleness of his hold. The way he constantly watched over every step and breath Izuku took, possessive and controlling in the best of ways. Carefully monitoring him to make sure he was okay. His shadow that Izuku did not care to live without. 

Just the thought of him makes Izuku slick even wetter, burn even hotter. His hips roll against Katsuki, feeling the hard length of him. 

“I like class,” he gasps into the nook behind Katsuki’s ear. They’re plastered so close together that the shudder it sends through Katsuki’s body trembles through Izuku too. Katsuki clutches him even tighter, growling as he comes with an unfurling of warmth in Izuku’s tummy. Yes, Izuku thinks. Yes, yes, yes, he thinks again when Katsuki pushes him back against the wall and drops to his knees, wrenching Izuku’s legs apart. Shouldering between them. 

“You like my mouth more,” Katsuki says.

“Fuck—yeah, I do,” Izuku agrees. 

They don’t make it to class. 

A few days later, Katsuki is literally balls deep inside him when he suddenly jolts.

“FUCK!”

About five good strokes away from coming, Izuku slaps at his sides and pulls in with his legs around Katsuki’s waist to keep him moving. “That’s the general point, get the fuck on with it.”

But Katsuki stops moving entirely and pulls himself out with a drizzle of slick and pre that Izuku can feel running down the curve of his arse. 

Izuku nearly starts fucking bawling. He wants his fucking orgasm. He had let Katsuki squirrel him away to the smaller rose garden at home with the pretence of having a picnic for dinner while Katsuki’s parents were away. Needless to say, Izuku and Katsuki had very different definitions of dinner. But if they stopped now then Izuku would just be all worked up for nothing and he refuses to let that happen. If Katsuki wasn’t going to satiate the lust he had unlocked in Izuku then he shouldn’t have fucked him in the first place. 

He tries to flip them, intent on riding out his own orgasm if needed, but Katsuki resists. “Deku, just wait one minute. I need to ask you something.”

Izuku snaps his teeth at him. Katsuki just laughs, the fucker. 

“Will you go to prom with me?”

Izuku stops cold. The summer prom is the night that originally led to his conception. In his original timeline, Katsuki and Ochako got together during the after party. If Izuku goes with Katsuki instead, he’s as good as given up entirely on keeping that original timeline alive. He can’t do that. He can't. 

Izuku may have been defeated in his quest to fix the timeline, he may only be savouring these last few moments out of sheer denial of what he’s fucked up, but he can’t bear witness to the last chance he has of his own survival. He can’t take that last, silent hope away from himself. The hope that somehow, some way, this all resolves itself and he gets to go home. 

Home. Tears spring to his eyes at just the thought. He wants to go home so badly. He misses his dad so much. Katsuki would know exactly what to do to fix all of this.

“Kacchan, I’m sorry but I can’t.”

“Why not?”

“I just can’t, I need you to accept that.” And then, because he can’t help himself. “Why don’t you go with someone else and enjoy the night? I won’t mind.”

“Not this again - I’d mind. Why won’t you just go with me? Do you always have to be difficult?” Izuku crosses his arms and refuses to look at Katsuki. He knows he won’t be able to bear the sad, pleading look he’s wearing. “Please, Deku. It’s the night before your parents return from their business trip, we won’t be able to spend nearly as much time together after that. Don’t you want just one last night together in the same bed?”

The urge to cry just grows stronger. Only Izuku knows it will be their last day together at all. He’ll have to go back to the future that night, the failsafe won’t let him stay any longer than that and will drag him into the future kicking and screaming at the stroke of midnight no matter what. 

Deku and Katsuki will never see each other again, and there's no telling if Izuku will still exist at all. 

“Please, Deku. Just one last night.”

Katsuki has no idea just how powerful his words are. 

“Alright, Kacchan.” Izuku closes his eyes, already knowing it was a bad idea. “One last night. One last night before it’s all over.”

There’s only two days to the ball, and it’s all the school will talk about. 

After Katsuki asked him to go, Izuku has been trying to get a moment alone to mope and just breathe for a minute. He gets his chance when Kirishima corners Katsuki into giving him some advice on what to wear. 

“-- WHAT THE FUCK DO YOU MEAN, CAN YOU WEAR CROCKS? NO. NO, YOU CANNOT WEAR FUCKING CROCKS, YOU HEATHEN. ARE YOU INSANE ? IT’S A FORMAL EVENT.”

Izuku sneaks away and internally prays for Katsuki’s blood pressure when Ashido and Kirishima get married in the future and the groom wears black crocks to the ceremony with bow-tie decals, while the bride wears pink sparkly ones. Izuku’s seen the photos: Katsuki looks like a bomb waiting to go off in all of them. There’s a video of Katsuki finally having enough and stealing them at the reception, only to blow them up with the fireworks kept in reserve from the ceremony. It makes Izuku laugh so hard every time he sees it.

His levity lasts all the way to the school field, where the empty space leaves him nothing to think of but his own fuck-up. He’ll never be able to see that video again. He turns the corner to go to the little hideaway nook between the hedges where everyone comes to smoke or makeout, not wanting a teacher to get on his case. 

His thoughts get darker and darker: Izuku won’t be able to see anything beyond the next two days–

Huh. 

The nook is occupied. By Uraraka Ochako and Midoriya Inko. 

Very occupied. 

Izuku stands there, too shocked to move. They too, stare back. They attempt to jump apart, but well–

They’re knotted together. Midoriya looks like she’s two seconds away from snarling at Izuku to get out of her mating space. Beneath her, Ochako covers her face as if that will prevent Izuku from identifying her. 

“Erm, sorry!” Izuku finally gets the brain cells together to swivel around, clutching his bright red face in his hands. “Sorry! I’m just going to – go. Sorry!”

He runs. 

This timeline is so fucked.

Time goes in fast forward, and it’s the night of the dance and Izuku had thought that he could be brave. He thought he could do this.

He is sitting in Katsuki’s car. They are parked outside of the school hall. There are people streaming past, arm-in-arm, laughing merrily. The faint sound of music comes from the building. All Izuku can smell is Katsuki and the leather interior of the car. Katsuki’s hand is resting on his thigh. He’s asking if Izuku is alright. 

Izuku is not alright. Izuku had been wrong. He can’t do this. 

He absolutely can’t do this.

He shrugs it off. “Yeah, everything’s fine. Let’s go in.”

Let’s go back for a moment, to the start of their last day together. 

Izuku had woken up in Katsuki’s comforting embrace to the feeling of kisses being pressed into his nape. He had been pleasantly sore after he’d made sure their last night together was one to remember. 

The entire time, all he’d been able to think about was that this was the last time he'd get to feel Katsuki between his legs. The last time his daddy would come in his mouth, his pussy. Izuku would never get to feel that just-slightly-too-much stretch. The taste of salt and musk and his father’s claim. The last time he’d be forced to take it with honeyed growls of, “My good baby boy. My pretty fucking slut, taking it so fucking well. Born to take my cock.”

Instead of getting to have a reprise of the night, Izuku was forced out of bed by the calls of Mitsuki and he’d barely seen Katsuki for the rest of the day. 

Once Mitsuki had learnt that they were going to prom together, she had been fussing like nothing else. Izuku’s dress had been ordered weeks ago, when he first came, like she had been anticipating this exact event, but he never got to see it until today. She’d whisked him away this morning with the premise of a ‘spa day’ in her rooms. She had not mentioned the pair of beauticians hiding in said rooms, who she promptly sacrificed him to.

They massaged him until Izuku was little more than a puddle of limp complacency, and then they had done everything under the sun to primp, pluck, buff, and preen him until he glowed. Make-up applied and curls woven into an elegant half-up, half-down style, Mitsuki had brandished her last gift.

“Is that a fucking corset?” So sue him, Izuku had been spending too much time with Katsuki and the cursing had rubbed off on him. 

“It’s a fucking corset.” Mitsuki beams brighter than Izuku’s newly waxed skin. She had it wrapped around him before Izuku could even ask when she’d had it made. “You said you’d wear one for a formal event, and what do you know, you’re going to prom, a formal event.”

Even Izuku couldn’t argue with that logic. 

It wasn’t too severe of a corset, anyway. Mitsuki would never do that to him without preparing for it. 

“It’s simply to support the dress and make sure it hangs right,” Mitsuki explained. “It’s not like I want to change your natural figure.”

When Izuku saw the dress, he felt breathless for a reason much different than the increasing cinch of his waist.

Mitsuki saw his reaction. “I told Katsuki I’d kill him, right? I always deliver on my promises. You’re going to look sublime.”

Practically deaf to her words, Izuku nodded.

Dressing was an experience in oversensitivity. The cool silk glided over Izuki’s exfoliated skin so smoothly it sent shivers down his spine. Cream white, cool to the touch, and only the slightest of rustling as it flowed over itself. Floor length but form fitting. Laces at the back pulled it tight over his chest so that the material clung to his waist and thighs/ass, before gaining more movement around his knees. He couldn’t wear underwear underneath, the material was so fine that the lines it would surely show; all he had was the corset and the lightest chemise underneath. 

The dress had no shoulders. Two thin straps held it around his neck in a halter, and it left his shoulder blades exposed. Freckles that usually went unseen on full show. Every breeze made him shiver. The sleeves were attached in the barest form of the word. They fell at mid-bicep, clinging tight until his elbow, where they fell in a waterfall of fabric that was nearly as long as the dress. 

When he swayed side to side, the dress flowed like water around him. 

He felt like a damned princess. 

“No one will be able to take their eyes off you,” Mitsuki said, pride suffusing her words. “Just one last touch.” She opened a jewellery case and slipped something out of it. She approached where Izuku was standing in front of the mirror and slipped something over the top of his head to fasten it around his neck. 

When she moved away, an intricate but thin silver necklace remained, encrusted with clear crystals that shimmered under the lights. 

“There. My masterpiece.” She almost sounded reverent. 

Izuku couldn’t take his eyes off himself. It was a very natural look: his curls had been pulled back into a chignon and only a few shorter pieces had been allowed to frame his face; his makeup was light, darkening his lips and eyes; the dress was simple and unembroidered or patterned; and the necklace and some drop earrings were his only jewellery. But altogether it made something magical. He had never felt so beautiful. 

“Thank you, Mitsuki,” he said, fanning his eyes to try and prevent any waterworks. “I’ve never – I look-”

She simply smiled. “It’s my pleasure. I hope you have a night you’ll never forget.” And then, “Let’s go show Katsuki. I bet Masaru fifty bucks on him falling on his fucking face when he sees you, and by god am I going to win.”

Izuku laughed, but obligingly followed her onto the landing. He didn’t dare look over the bannisters to see where Katsuki was, he wanted to see Katsuki’s face when he first saw him. 

“BRAT, WHERE ARE YOU?!” 

“WHERE I’VE BEEN FOR THE LAST FIFTEEN MINUTES – AT THE FUCKING DOOR. WHERE HAVE YOU BEEN? WE’RE GOING TO BE LATE!”

“I’LL SHOW YOU LATE WHEN YOU HAVE TO GO TO THE HOSPITAL TO GET MY SLIPPER OUT OF YOUR GODDAMN ASS.”

“OH YEAH? BRING IT ON YOU WASHED-UP HAG, I’LL KILL YOU – holy shit.”

At the top of the stairs, Izuku looked down at Katsuki and smiled. “Hi, Kacchan.”

He was amazed he managed to even say the words. Katsuki looked like a dream and it made Izuku overly aware of his tongue in a way he normally very much wasn’t. Katsuki was wearing a suit for the event, the blazer and trousers midnight black and crisp, the tie mysteriously missing. He’d left the top few buttons of his satiny bottle green shirt undone, revealing the dips of his clavicles, a shine of a necklace, and just a hint of pec that made sirens whir in Izuku’s head. 

He looked so much like his future self that, for a second, they overlapped in Izuku’s brain. 

He was entirely certain that the slack, hungry expression on Katsuki’s face was reflected on his own. 

He needed to be closer. 

He took a slow step down the stairs, skirts held in his hands, trying to be careful so he didn’t trip, fall, and die before he got to touch Kacchan while he looked like that. In the same moment, Katsuki jerked forward to get to the bottom of the grand staircase where he could wait for Izuku. 

Only, he caught the edge of a rug a few steps in and stumbled forwards before he got his balance back. When he looked back up, his entire face was flushed, from his cheeks to his ears, and then his face contorted into a glare. “You didn’t see anything.”

Repressing his giggles, Izuku turned behind to look at Mitsuki. “Does that count?”

Her smirk was diabolical when she looked at Masaru, who was patiently waiting by the door with the camera and was looking pretty exasperated. “You bet it does. Ice cream on me tomorrow, darling.”

Izuku’s smile faltered. I won't be here tomorrow.  

Before he could say anything, they were at the base of the stairs. Recovered – or perhaps distracted – from his embarrassment, Katsuki took Izuku’s hand and kissed the back of it with a heated look. 

“You look beautiful. There’s no words strong enough to describe my feelings right now.”

Heart thumping, Izuku felt the heat blazing on his cheeks. “Thank you. You look… well, you look like something from my dreams, really.”

“Oh, yeah?” Katsuki asked, flashing a crooked smile. “Naughty ones, I hope?”

Mitsuki, forgotten to the sidelines, whacked the back of Katsuki’s head. “Brat, do you have no shame?”

After a month of Katsuki, Izuku can attest that he absolutely had no shame whatsoever. 

“None. Now go away, hag. I’m busy admiring your work.”

It was the closest Katsuki would ever come to a compliment, and Mitsuki took it as such. Mollified, she went off to talk with Masaru. 

Now they were alone, Katsuki used the grip he had on Izuku’s hand to encourage him to spin. He groaned when he saw the open back of the dress and the way it clung to Izuku’s hips and ass. “You’re gonna fuckin’ kill me, Deku. How am I meant to last through an entire evening when you look like this?”  

Light-headed on Katsuki’s attention, Izuku completed his spin and sashayed closer into Katsuki’s space. He looked up at the alpha from under his eyelashes and slipped a hand to cover Katsuki’s racing heart, fingers just barely brushing his bare chest where the buttons revealed it. His other hand curled around Katsuki’s nape, encouraging him to bend down. “You’ll have to be good for me, I suppose.”

Katsuki’s head ducked closer, eyes dilated. He very purposefully did not touch Izuku with his hands. “Careful, Deku, my restraint is on a bit of a thin chain at the moment.”

“Who said you need to restrain yourself?” Izuku pressed closer, placing his other hand on Katsuki’s hip so he could dip his thumb just under the belt of his trousers. 

Katsuki’s hips jerked, just slightly. He looked up at the ceiling as if asking for strength. When he looked back down, it didn’t look like his plea had worked; he looked wild. “You’re playing with fire, omega.”

It shouldn’t be legal to be this turned on by someone. Fire coursed through his veins and Izuku whined quietly into the small space between them, nose tucking in to whisper over Katsuki’s neck. “I’ll be good for you, if you’re good for me,” he said, not even knowing what he meant. He couldn’t think past the alpha in front of him and how much Izuku wanted to bite at his neck.

“God, who put a cock-whore like you in white? I’ll be so good for you. I’ll give you exactly what you want. Fill you up with cock and come until you’re choking on it. Is that good enough for you, omega?”

Finally, Katsuki’s hands settled on Izuku’s hips and pulled him in. Izuku’s mind was just an endless chant of yes-yes-yes-yes–

A cough interrupted them. 

Katsuki didn't let Izuku spring away. He held on to him even tighter, the tight circle of his arms tucking in close as he glared over Izuku’s shoulder. Izuku pressed close, shaking with desire he couldn't repress.

“Relax, brat. You need to leave soon, you’re going to be late.”

“Whatever, we’re going. Save the pictures for tomorrow, dad.”

“Katsuki!” 

“If we don’t leave now, we’re not leaving at all. Let’s go, Deku.”

Izuku’s legs wobbled as he followed Katsuki out to the car. Only Katsuki’s arm around his waist kept him standing. “Don’t worry,” Katsuki said as soon as they were out of his parents’ hearing range, “I’ll fuck you exactly as you need as soon as this ridiculous thing is over.” Izuku’s legs nearly gave out. All he could do was whimper, inciting a lust-thirsty leer. “I bet you’re soaking for me under that dress, isn’t that right?”

Damn him, but it was. 

His lust lasted him all the way through the drive to school – admittedly, the hand Katsuki placed on his thigh didn't help – and through them parking and making out in the quiet of the car. 

Then, for one still moment, Izuku realised he couldn’t do this. 

He thought he could. He was wrong. 

He looked at Katsuki. He breathed in. 

He had to do this. 

“You ok, Deku?” Katsuki asks.

“Yeah, everythings fine. Let’s go in.”

They entered the school hall, which had been decorated for the occasion to have some sort of flower theme. Something that actually looked quite nice, the school's high budget coming through. Everyone they passed sent him looks as he entered on Katsuki’s arm and Izuku let it distract him. He put it out of mind, sipping on the drink Katsuki collected for him, and he forgot about his doubts entirely when Katsuki pulled him onto the dance floor and used the excuse to pull him obscenely close. 

And then Izuku’s on the dancefloor and he’s having the time of his life with the love of his life. The strobe lights, the humid air, and the drench of Katsuki’s pheromones makes him feel like he’s flying. He’s incandescently happy. This is what he’s always wanted. Katsuki is what he’s always wanted, and – in this life, in this time – he gets to have him. 

Katsuki leads him, laughing, through every song that comes up. They swing around, they sway in place, they gyrate. Through it all, Katsuki looks just as happy as Izuku does. He’s radiant in his joy, and it makes Izuku feel like he’s going to die with happiness. Katsuki looks at Izuku and it’s weird how it’s so similar to how his dad usually looks at him. 

It knocks the breath out of Izuku, just for a breath. For a second, he remembers. 

Katsuki’s fingers flex on his hips, and Izuku pushes it all down. He doesn't want to miss a moment of this. The music is soft and dreamy, and Izuku loses himself in it. For a moment, they’re not in the middle of a dancefloor, surrounded by people. They are utterly alone. Just him and Katsuki, dancing so close together that their lips brush.

Katsuki inhales, pulls him close. “I want this,” Katsuki whispers into his ear, nosing at the shell of it, before pressing a kiss there. “I want this, always.”

It's a direct echo of Izuku’s thoughts. “Me too,” he says, because why shouldn’t he? It’s the truth. “I want you, always.”

He doesn’t resist when Katsuki kisses him. His lips tingling as Katsuki opens him up for his tongue. Wet and hot, and so demanding that Izuku’s hand has to hold something, so he clenches at Katsuki’s shirt and probably destroys a few more buttons. 

Good. he wants it gone. He wants Katsuki to back him into a wall, push up his skirts, get his legs around his waist, and fuck him here and now. He wants to be destroyed until all he can think about is Katsuki and how good he makes Izuku feel. 

Katsuki breaks the kiss, and Izuku whines, high and beseeching. Get back here.  

“Fuck, how are you real? How are you mine?”

Which is very sweet and all. It makes Izuku soar inside, in fact. But Katsuki is still motionless and so very far away. Izuku’s eyes flutter open, ready to glare and tell him to ‘come back here or so help me god’, but over Katsuki’s shoulder he catches a glimpse of Ochako and time goes still. 

She’s sitting alone at her table, glumly watching the dance floor. Her eyes meet Izuku’s and he remembers. 

He abruptly remembers what, exactly, he is fucking up by being here. 

He pushes Katsuki away. 

He can’t do this. 

“I’m not yours,” he spits. There’s a vague outline of one last plan forming in his head and he grabs at it with desperation. One last shot at ensuring his own existence. “How many times do I have to tell you? I’ll never be yours.”

Katsuki flinches from him, hurt. But Izuku doesn’t let himself see it. If he sees it, he won't be able to carry this through to fruition. 

“What? Deku, what are you saying?” Everyone is watching them, so Izuku pulls Katsuki away to the hallway outside. The least he can do is spare his alpha a greater humiliation.

The short walk lets him form a resolution for his plan. He needs to break Katsuki’s heart. Maybe, then, Katsuki will look for the person who he is truly destined to be with tonight. Maybe, that way, Izuku will live and they will be able to meet again in the future. Even if Katsuki will never recognise Izuku as his first love, only as his child. 

This isn’t just Izuku being selfish, either. Once the clock strikes midnight, Izuku will be whisked away, no matter what. Left behind, Katsuki won’t understand why the omega he’s been courting has just disappeared into the ether. Izuku and Katsuki’s future is doomed to end in heartbreak, no matter what Izuku does. Even if Katsuki and Ochako don’t end up conceiving him tonight, Katsuki cannot have feelings for Izuku beyond this point.

The best thing he can do for his Kacchan, the Kacchan that will have to remain while Izuku disappears into the future that he’s blown to bits, is ensure that the alpha is not left with a heartbreak he’s never able to get over. He needs to break things off with Katsuki, so cleanly and absolutely that he will never look for Izuku again. He will not allow Katsuki to pine for him. 

Izuku couldn’t bear it if it was because of his fuck up that Katsuki never finds love again. At least, in the original timeline, Katsuki had been happy and fulfilled being a father. In this one, Katsuki will likely have nothing after this night. 

Izuku's heart aches for his father who is never going to meet him. Katsuki had always said that being given Izuku as a son was his greatest blessing in life. He’d taken the greatest joy in being Izuku’s father. 

Izuku had always had this little whisper of doubt about that. There’s a part of him that’s sure that there must be some doubts in Katsuki, some wishful thinking for what if. Always aware that Katsuki hadn’t fully chosen the path he’d been put on. But as Izuku’s grown up, he’s learnt that it’s true: Izuku is Katsuki’s greatest joy, and he wouldn’t change anything in his past, even if he could. 

Izuku has just this one chance to hopefully fix everything for them both.

The hallway is refreshingly quiet and cold compared with the dance floor. Almost too quiet. The sudden lack of noise is almost jarring. 

“Deku,” Katsuki says, achingly soft as he reaches for him. It's the quietest Izuku has ever heard him. 

“Don’t touch me!” Izuku can't let the fog of Katsuki’s presence sway him from his objective. He can’t afford to be soft. “Bakugou Katsuki, I reject your courtship, and I reject your claim. Let us be nothing to each other.”

He says it all at once. Rips off the plaster, leaving only the aching wound below, open to the pain of the world. 

Katsuki’s bewilderment doesn’t last for long. His long legs get him up in Izuku’s space quicker than he had anticipated. Hands settle on his shoulders and shake. “What is this and where is it coming from? You were — you were happy just a second ago. How did I fuck up this fast? Tell me what’s wrong, Deku, we can work through it.”

“It’s nothing you did. I just changed my mind.”

“Bullshit, tell me what I did so that I can fix it.”

Izuku sniffles, trying to hold back his tears. “I changed my mind. I don’t want yo- you as a mate.”

Katsuki rears back. “No. No, don't say that. Nonononono-” His breaths are short and violent, and he keeps running his hands through his hair and pulling, like he’s breaking apart at the seams. His eyes squeeze shut; he’s holding back tears. “No, please, Deku.” He reaches forward again, but Izuku dodges back and Katsuki whimpers. 

It’s a bullet to Izuku’s heart. He wants to comfort him so badly, but he forces himself to stay right where he is. To only watch as Katsuki wraps his arms around himself in self-comfort as tears gush from his eyes. 

It’s the most pathetic Izuku has ever seen him. Red-eyes, anguished, and falling apart. He still looks beautiful. 

“Goodbye, Katsuki. My parents are coming back tonight, and they’re taking me to live in a different city. Don’t look for me.” 

He turns, unable to watch for even another second, and runs away. 

“NO! DEKU, PLEASE DON’T GO. PLEASE, I LOVE YOU. YOU'RE MY ENTIRE WORLD. I LOVE YOU, DON’T LEAVE ME. PLEASE – PLEASE, DON’T LEAVE ME.”

Izuku ducks around a corner, sobbing. He can hear Katsuki footsteps as he runs after him, but Izuku has a head start. 

He doesn’t look at the photo tucked into his corset before he presses the button on the preprogrammed watch that will take him back.

Just one press, and he’s gone. 

A moment later, Katsuki skids around the corner and runs past where Izuku would have been standing. “DEKU! PLEASE COME BACK. I LOVE YOU SO MUCH, BABY PLEASE- ”

Izuku appears in the same hallway of school, panting, heart in his throat. It’s exactly the same, only it’s midday and the trees outside are bare. 

It is winter, it is Saturday, and the school is, luckily for Izuku’s forgetfulness, shut. There is no one around to see him appear from no-where wearing a ballgown.

But, most of all, Izuku is somehow alive, and he can still hear the echo of Katsuki’s desperate shouts.

He sinks to his knees and wails.

Chapter Text

Katsuki keeps running even though he’s long lost the trail of Izuku’s scent. He’s not sure he ever even had it, but his thoughts are all jumbled. Izuku must have left a scent trail, Katsuki is just too frantic to smell it.

He bursts out the doors to the parking lot and wildly casts around, trying to catch any glimpse of his wayward omega. 

I’ll never be yours!

There’s no one around to take the shot, but Katsuki flinches like he was hit anyway. 

Where is he? Deku had to be here somewhere. He couldn’t just disappear into nothingness, and he’s wearing a dress and heels, there was no way he could get that far. 

Yet, despite all of this, Katsuki cannot find him. 

It is summer, it is nearing midnight, and the school behind him is filled with the sounds of life and joy. Katsuki turns deaf to it. He’s listening for any footsteps, for a breath or a whimper or a scent from a person he would know with all his senses taken from him. 

But it is useless, all he can hear is his own laboured breathing. Deku is gone and he does not intend to ever come back. 

Katsuki is alone. 

He sinks to his knees and wails. 

He’s found by… someone. Probably Kirishima, because he somehow ends up at an afterparty at someone's house. Katsuki is unresponsive when they talk to him, only muttering, “Gone. He’s gone. Gonegonegone.” 

Because they are teenagers, instead of calling for the police or a doctor for an alpha clearly on the edge of going feral, someone shoves a plastic cup full of some sort of alcohol in his hands, slaps him on the back, leaves the bottle nearby, and disappears. It’s so stupid. 

Katsuki drinks but doesn’t taste it. His glass empty, he looks at the bottle. He’s heard alcohol can turn off thoughts, or numb pain, or just cause a blackout. Katsuki wants all three. 

Before he can reach out, someone sits on the table in front of him and blocks his access to the bottle. “Hello, Bakugou. Would you like some company?”

He recognises her. It’s the one he thought Izuku was going to leave him for. The one with a round-face. The rage is too far out of his reach for him to feel it.

The strap of her dress slips off her shoulder. She doesn’t fix it. Her scent is boldly broadcasting exactly the sort of company she’s offering. If he wasn’t dead inside, his total derision would be showing on his face.

He doesn’t want her company. He doesn’t want anyone's company, no one but Deku. 

It’s only ever been Deku. 

The thought makes his chest feel like it’s being compressed. 

Up close, she really does have very similar features to Deku, if a bit softer and rounder, but the colour is all wrong. She’s all wrong. The wrong person. Katsuki thinks that’s a good thing, right now. 

Deku is never coming back, and Katsuki needs to stop thinking about that fact before he goes insane. Alcohol isn't going to cut it, he needs a distraction.

“Bakugou? Are you okay? I asked if you wanted some company?”

He finishes his drink in one gulp.

“Yeah, alright then.”

He lets her ride him there on that couch. And then, when that doesn’t work, he flips her around so he can’t see her face. It’s not her he’s imagining under him, it’s Deku. 

But if it were really Deku, there’s no way he’d fuck him this publically; he never wanted anyone else to see Deku in a state that only Katsuki should ever get to see him in. But with Round-face, Katsuki just doesn’t care. They’re not even the only pair fucking in the room. Just one of the many.

There’s a condom in his back pocket. His mum slipped it there earlier despite the fact that Katsuki hasn’t been using them with Deku, not even during his heat. It’s very obvious what Katsuki had been trying to do (and if he thinks about it too hard, he thinks he'll crack and start sobbing or raging over the fact that it hadn't worked. Katsuki is such a fuck up of an alpha he hadn't even managed to breed the most perfect omega while he was in heat, and now Deku is gone forever). 

But right in this instant, Katsuki isn’t thinking, and he forgets the need for protection. 

It hadn’t worked on Izuku, the most perfect and breedable omega to exist, so why would it happen with this random beta?

In the end, the alcohol probably would have worked better to numb his thoughts. But the sex worked for a moment, and then everything just came back to him, worse. He's disgusted with himself, with the thought that he let someone else other than Deku touch him. 

Katsuki only finds that out too late.

Deku will never come back to him now. 

No wonder Izuku left him. He's pathetic.  

A few weeks later, Uraraka comes to him with 9 different pregnancy tests. They are all positive.

Despite his desperation, Katsuki still hasn't even managed to find even a whisper about where Deku and his parents went. His days have been filled with half-feral rage outs and frantic searches for where his omega could have gone. By the time Uraraka comes to him, he just doesn’t care about anything anymore. 

Their parents arrange the wedding to save face. Or, Mitsuki hires someone to arrange it anyway. She’s too pissed at Katsuki to do it herself. She’s also too busy working on her new design business. Fashion for omegas, she tells him eventually.

Katsuki stops asking, after that. He knows who inspired her. 

Katsuki would protest the marriage, but there’s no way to fight it. Everyone saw him and Ochako that night. Everyone knows they fucked, and Ochako hasn’t been seen with anyone else. The only person who could have fathered it is Katsuki. 

It’s whatever. They get married in a small little ceremony that Katsuki barely remembers, but it doesn’t change much. There’s just another person in his house who Katsuki doesn’t speak to. He tracks the pregnancy with the same interest with which someone would track a snail making its way across a leaf. 

And then, eight excruciating months later, Katsuki is standing in a hospital and he is staring down at a baby sleeping in a cot. His baby, he is told by the nurse standing to the side as she hands it to him. 

He wasn’t present for the birth. This is the first time he’s holding it, but it smells healthy and well cared for. He can tell it’s an omega from its scent too. It’s wearing a little cap and onesie Katsuki’s mother must have made to keep it warm. It’s just him and the baby; Ochako and his parents are … somewhere. Katsuki hadn’t really cared to track where they went.

It wiggles. Squirms and yawns as it wakes up from its nap. 

Katsuki… feels. 

“He might be hungry when he wakes up,” the nurse says. “Shall we take him to his mother?”

“Just one minute,” Katsuki says. He cradles the child closer, securing it against his chest. He wants it to stay just them for a moment more. He doesn’t want to let go of the child just yet. “If he cries, we’ll take him to her.”

As if in agreement, the baby curls his hands into Katsuki’s shirt. Katsuki strokes it, marvelling at the tiny little fingers and even tinier fingernails. The hand transfers its hold from Katsuki’s shirt to his finger and curls around it with unprecedented strength. 

Katsuki hasn’t cried in nine months. He starts to, at this moment. 

His child is nothing in his hands. So light and small; he needs protecting. It’s a harsh world out there, and Katsuki is the only protector this little bundle has.

His baby wiggles again, mouthing against Katsuki’s shirt. The cap falls off, revealing a shock of wavy green hair underneath.

Everything — stops. 

Green eyes flicker open. They turn blurry; Katsuki can’t see through his tears, but now he’s looking, he thinks he sees the faintest hints of freckles on his baby’s cheeks.

Katsuki doesn't care how or why, not when he’s holding a miracle. A gift from the universe. A cosmic correction giving Katsuki a baby who looks just like his lost love - the person who should've given birth to his pup.

“Katsuki?”

He looks up. His mother is standing opposite the incubator and she looks so very sad. Behind her, Ochako is watching him warily. 

“He’s beautiful,” the nurse tries to smile at Katsuki, speaking with the sort of practised softness that suggests that people breaking down while holding babies happens all the time and not to be embarrassed. “You’ll have trouble keeping the alphas away when he’s grown up.”

Katsuki snorts and holds his baby closer. “No, this time for sure, I’ll make sure to keep this omega safe.”

She smiles indulgently at yet another overprotective parent. “Have you thought of a name? Your wife said that you both still couldn’t choose between –”

“Izuku,” Katsuki says. For the first time, he doesn’t flinch at the name, he just stares both his mother and Round-face down when they open their mouths to object. “His name is Bakugou Izuku.”

Chapter Text

For the first time in a month, Izuku turns on his mobile phone. Luckily, he’d stuffed it down his corset before he’d left for the dance, and he uses the last bit of battery to call Mei to come help him get out of school without setting all the alarms off.

He ignores the plethora of missed calls and messages from ‘Daddy <3’. He can’t even look at them for too long.

Mei answers, frantic but happy she didn’t kill him either with a malfunctioning device or with the inherent risks of time-travel, and tells him to meet her in the wood-crafting studios. She’d long since made a copy of the woodtech teacher’s key so she could sneak in whenever she wanted.

By the time he gets there, she’s already arrived and gotten the doors open.

She runs towards him, manic-eyed. “You’re alive! My baby!”

He opens his arms for a hug – he really fucking needs a hug – but she blows past him to tackle the wristwatch off of him, muttering about all the data she can retrieve from it. Izuku is left with his arms outstretched, so he lowers them awkwardly.

“Did it work? Did you end up in the right time-period?” she asks him, eying his dress.

“Yes.”

“How long were you there for?”

“The entire month.”

“Izuku,” she admonishes, “I told you only to stay for 30 mins tops. Do you know how risky that was?”

He looks her dead in the eye. She seems to notice for the first time the redness of his eyes and how pale his face is. “I erased myself from existence. I had to stay to fix it. I didn’t think it had worked, but I ran out of time…”

She gapes at him. “You erased your existence? How are you still here?”

“I don’t know. But you should really destroy that thing. It’s… dangerous. Time shouldn’t be messed with.”

“What happened?”

“I don’t want to talk about it. I just want to go home.”

She nods slowly. “Okay, but first you should come home with me and get changed… maybe take a shower too. You smell…” she sniffs and a perplexed look shoots across her face. “You smell really strongly of an alpha and sex — Izuku, who the fuck did you bang to smell like that? It’s like you’ve been claimed.”

Izuku snorts. It turns into giggles, which turns into full-fledged, side-splitting laughter, which turns into sobs.

“Oh, you’re never going to believe me.”

Mei takes him home with her, and he makes her keep the dress. He doesn't want to even think about what would happen if Katsuki or Mitsuki saw it. He hasn't decided whether or not to tell anyone apart from Mei what happened.

Freshly showered with industrial grade scent neutralisers, new scent blockers on his neck, and in a spare pair of Mei’s joggers and a hoodie he’d left behind at hers once upon a time, Izuku could almost convince himself that the last month was just a dream.

Unwilling to let Izuku drive, Mei drives him home in silence. Izuku doesn’t mind; she’d taken his entire story much better than he’d thought she would. It wasn’t exactly taboo for alpha fathers to show the ropes to the omegas under their care, of course, but it was still an old, dying-out practice. And even that was much different to what Izuku had done in the past.

The car journey allows him the time to puzzle over her words when he’d asked her why she wasn’t more shocked.

“Well, your dad has always toed the line anyway. It makes sense, to be honest, that without the boundaries of being family he'd be all over you.”

Those words echo in his ears, closely followed by Katsuki’s cries.

I LOVE YOU. PLEASE, DON’T LEAVE ME.

They turn into the drive up to his house, and it all suddenly becomes very real. His father’s cars are all in the driveway, so he’s definitely home.

“Good luck,” Mei says when he gets out. “He’s been blowing up everyone’s phones looking for you for the last few hours.”

“Fantastic,” Izuku groans. He had forgotten entirely about the argument that had led to him going to the past. Just what he needed; it had only been a few hours since then in this timeline, but Katsuki must be going out of his mind with Izuku’s disappearance.

“Remember, everything that happened, happened over sixteen years ago for him. It’s your choice whether to tell him.”

Izuku bites his lip and nods before closing the car door. She drives off before he can even wave goodbye.

Behind him, the front door slams open. “WHERE THE FUCK HAVE YOU BEEN?”

Kacchan. He sounds angry, but Izuku knows that's just a cover for his panic. Katsuki never could handle it well when he didn’t know where Izuku was.

Izuku closes his eyes. Don’t cry. Don’t cry. Don’t fucking cry.

“OI, LOOK AT ME WHEN I’M TALKING TO YOU.” A hand on his shoulder, large and hot, spins him around. “You’re in so much trouble – baby, why are you crying? Hey, hey, it’s okay, I’m here. Open your eyes, baby-boy. Why are you so upset? Did something happen?” Izuku doesn’t open his eyes but he does start sobbing in earnest. He can’t bear to see this grown up version of the man he loves. “Shh, no, it’s okay. I’m not mad. I promise I’m not mad, I was just worried. Please just stop crying – you know I hate it when you cry. Are you hurt?”

“I’m not hurt,” Izuku lies.

He’s gathered into strong arms, one hand stroking his back. “Then what’s wrong, darling?”

“I just —” a fresh wave of sobs. He feels so safe. He feels like he’s exactly where he’s meant to be. “I just missed you so much, daddy.”

There’s an audible hitch in Katsuki’s breath. “Oh, Izuku, I missed you too. I was so worried.”

“I’m s-so sorry.” Izuku says through the blockade of tears in his throat, speaking to the younger version of Katsuki he left behind. The one who grew into this person who Izuku loves with his entire heart and would do anything for. The one who lost Izuku and then had to get married barely a month later to someone who only wanted his fortune. “I’m so s-s-sorry. I’m so sorry, Kacchan. Please, I’m sorry. I’m-”

Katsuki nuzzles into his neck. He’s bewildered, Izuku can hear it in his voice, but he still assures Izuku, over and over. “It’s okay. It’s okay. Shh, it’s okay, baby. I’ve got you. I always do.”

They sink down, Izuku ending up cradled in Katsuki’s lap right there on the driveway, arms wrapped around each other as he attempts to calm him down. Eventually, Izuku cries himself out, and Katsuki picks him up like he's a baby.

“You’re gonna have to explain why you don’t have our pack scent marks on you tomorrow. But just sleep right now.”

Izuku is lowered onto a bed. It’s Katsuki’s. He can tell just from the scent. He snuggles into a pillow, already half-asleep.

Katsuki’s weight shifts, and Izuku’s hand snaps out before he can stop it. “Stay, please. Don’t leave me, daddy.”

“Never,” Katsuki says. He slides under the duvet and curls up to Izuku’s spine, his arm coming around to fasten them together. “I’m never going to leave you, pup. Never, I promise.”

So, yeah, Izuku absolutely tanks his first attempt at being casual. Like, he really just blows any chance of his dad not realising something is up to smithereens.

To be fair to him, how are you meant to be casual about sleeping with the younger version of your father, falling in love with him while also realising you’re kind of maybe very in love with his future counterpart, breaking his heart, and then coming back to the present day and being faced with him, who - yep, you love. If anyone has any tips on how to deal with this entire clusterfuck without sobbing, Izuku is just dying to hear them.

On his first morning back in the correct time period, Izuku blearily wakes up to a semi-illuminated room as the sun peers around the edges of the closed curtains. There is a hand stroking up and down his spine, and his nose is pressed against a chest.

The air smells overwhelmingly like Katsuki – spice and heat. Not just because they’re in the alpha’s den, but because the scent marks Izuku had been missing have been very thoroughly re-established at some point in the night. For just a second, he thinks he’s back in the past, and it’s just another morning in Katsuki’s bed.

But no, the figure watching him as he sleeps is older than Izuku has gotten used to seeing him, yet so familiar and beloved that Izuku just smiles. The faintest crows-feet. A chiselled jaw and slightly wider face. A dusting of stubble. But still so beautiful it makes Izuku’s heart hurt.

His father looks at him the same way he always does. Love, adoration, a weird element of fear and something else. Something darker and more heated that Izuku has never been able to classify. Something that has only appeared in recent years. Something that now he’s seen, he can't unsee. Something he’s come awfully familiar with seeing in Katsuki’s face since he went to the past, to the point he almost passes over it because it’s become his new normal.

Izuku sees desire in his eyes.

No. He’s delusional. The current version of Katsuki and his younger version are overlapping in Izuku’s head. Izuku can’t let his own wild fantasies fuck up his relationship with his dad. He can’t project his own feelings onto his own father.

“Morning, daddy” Izuku whispers, unwilling to break the serene quietness between them.

It's easy and habitual to call this version of Katsuki daddy, but saying it now makes Izuku flustered in a way it never has before. Since his time in the past, its use has been associated with a different connotation that he can't forget. More than that, his blast to the past must have driven him crazy, because he swears he sees Katsuki’s eyes dilate in response to the title.

The hand on his spine stops moving, settling over his nape domineeringly. “Why did you wash all your scents off yesterday? You know that’s dangerous.”

Oh, fuck, he’s pissed. Izuku can hear it in his voice. “It’s not important.”

The hand flexes. “What are you hiding from me? Where did you go for so long? What scent – whose scent did you want to hide so badly from me?”

“No one’s!” Panic makes Izuku’s voice go high. He takes a breath. “I wasn’t hiding anything. I just spilt some chemicals on myself at Mei’s lab and had to take a shower to get it off?”

“With industrial grade scent neutralisers?” It’s clear Katsuki doesn’t believe him. Izuku nods anyway.

I need to get out of here before I slip. Izuku is phenomenally bad at lying to his dad, and right here, in his den where his scent is the strongest and Katsuki is casually asserting his dominance, it takes far too much effort to go against Katsuki’s unsaid demand for the truth.

Thankfully, Katsuki only watches with a dark look on his face as Izuku gets out of bed to go wash up. Neither of them say anything.

When Izuku comes out of the bathroom, Katsuki is gone.

In retrospect, it’s very easy to see why Izuku took so long to understand that the Katsuki in the past had been courting him. Perhaps it’s because of the shock of Izuku’s crying fit, but Katsuki is reluctant to even spend a moment away from him. Despite the way he’s clearly pissed at Izuku, his dad still makes him his favourite breakfast. Still comes over to stand behind his stool at the counter to nuzzle behind Izuku’s ear. Spends a few minutes just standing like that, arms around his waist, while Izuku eats.

His dad has dismissed the cook and the maid that usually tend to the house, and Izuku is glad because it means neither of them are around to see how he blushes in his dad’s arms.

The line between what his dad usually does and what Katsuki did in the past is getting harder to decipher. Izuku can’t tell what is usual behaviour and what isn’t. Is getting confused because they’re both so similar and that just can’t be right.

“Do you want to watch a movie later? I’ve got another conference in a few days. I want to spend as much time with you as possible before then,” Katsuki asks.

This is another surprise. Before his trip to the past, Katsuki had been spending an increasing number of days at work, or travelling to go to the other offices of their family’s company. He was still just as attentive to Izuku, just as adoring, but the amount of time they’d gotten to spend together had been decreasing.

“I’d like that,” Izuku says, because he really would. “Your pick?”

“All Might?”

Izuku perks up. “The silver age movie?”

“Duh. I got the Blu-ray version for you. There’s a director's cut too.”

“But they never released that!”

“I pulled some strings with their company. We’re doing their costumes for their new Vigilantes movies, so I know the creative lead.”

Izuku swivels around in his chair and leaps at Katsuki. “Oh my god, thank you– you’re amazing, daddy! Let’s go and watch it right now, c’mon! Stop walking so slow! We’re going to have to marathon the entire series so we can see how it affects the story. I can’t believe you kept this from me.”

Dragged behind his little omega, a red-eared Katsuki just smiles indulgently. The heated look he sends Izuku goes unseen.

“How about you set up a nest for us and I'll make some snacks? If we’re going to be watching all 15 hours, then we might as well be comfortable.”

He earns a beaming smile, much better than the tears from last night. “Good idea! I’ll go get my stuff. You get the movie set up in our den, okay, daddy?”

“Sure, baby.”

Katsuki walks away, mouthing ‘our den’ to himself with a dark, satisfied smile.

Watching an All Might movie with his dad should be as relaxing as it gets for Izuku. Yet, here he is, cuddling in a nest with his dad and overthinking every single interaction they have.

It is normal for Katsuki to suggest Izuku build them a nest, and Izuku has one set up on Katsuki’s bed before he can even think through the consequences. It is normal for Izuku to end up half on top of Katsuki while they watch the movie, snuggled together and legs tangled. It is normal for Katsuki's nose to be buried in Izuku’s neck, hands petting his spine and legs. They have always gained comfort from each other's presence. Katsuki had even peeled off Izuku’s scent blockers to get at his pure scent underneath; Katsuki’s own scent is unblocked and steadily dominating the air around them: it makes Izuku's thoughts sluggish and hazy.

Is it normal? Should it be normal?

After his journey to the past, Izuku is hypervigilant to every movement Katsuki makes. The only difference between then and now is that Katsuki isn’t trying to use this position to lick at Izuku’s glands, or trying to get him to warm his cock. But Izuku is so aware of that fact that he could.

Just the thought of it has Izuku so highly strung that Katsuki eventually starts releasing comforting pheromones in response, pushing up Izuku’s hoodie to rub them directly into the skin of his spine and nape with his wrist, while his neck radiates them directly into Izuku’s face.

At the unexpected move, Izuku mewls, high and needy, and he feels how Katsuki tenses up underneath him. Instinct takes over. Izuku would be concerned about what his scent is broadcasting, but Katsuki’s pheromones are intense and they have been fogging his head up since they got into the nest together. The extra rush of them sends him into overdrive until he can’t think straight.

He’s on Katsuki’s lap, in a nest he made in Katsuki’s den, and Katsuki is scent drugging him. So, surely, Katsuki is about to fuck him? In Izuku’s foggy, instinct-driven brain, it seems like the only option.

The omega sniffs and knows he’s right.

Izuku wants it so bad. It’s barely been a day since he’s come back in time, and yet it feels like he’s been deprived of something essential. There’s a gaping emptiness inside him that only Kacchan can fill.

“Shh,” Daddy says and settles a heavy hand on his nape so that Izuku quietens. He’s pulled fully onto Katsuki’s chest, legs splayed either side of the alpha’s body. There is something hard underneath him that he wants more of. “Such a good omega, but it’s time to go to sleep.”

Izuku sleeps.

Izuku wakes up in his nest in Katsuki’s bed. Katsuki is peacefully sleeping on the other side, his back turned to Izuku.

He can’t remember what happened, but he must have been so tense and distracted that he’d fallen asleep without even watching one movie.

“It’s okay, you must have been really tired to miss All Might,” Katsuki assures him later when Izuku apologises for falling asleep so quickly. “We’ll just have to watch it again another time.”

But all good things can’t last forever.

Mitsuki comes back home, and with her she brings an updated contract for Izuku to look over. She wants to move him into the adult line of models. All that will change is that Izuku will be wearing clothes geared towards 16-19 year old omegas, instead of the 13-16 year olds as he has been doing so far. As he’s recently turned 17, it makes sense.

Katsuki doesn’t seem to agree. He freaks out.

Instead of Izuku bearing the brunt this time, Mitsuki is there to take point on the argument and she has always been much better at shouting Katsuki down. Izuku isn’t allowed out of Katsuki’s den, the alpha makes him stay in there while he and his mother fight downstairs. Izuku can still hear their voices.

He’s curious though and it is about him, so he sneaks down the stairs to listen in. It doesn’t work, he’s somehow spotted by his grandma and dragged into the argument.

“Izuku, tell your father that this is something you want.”

“He only wants it because you’ve been encouraging him!”

“Of course I’ve been encouraging him, he should have moved to the young adult section years ago. You’re deluding yourself Katsuki. He’s not a child anymore!”

“I know he’s not! I’m not an idiot and I’m not deluding myself, there’s just no reason why anyone else should see him like that.”

“Like what? Like he’s seventeen years old and not ten?”

“No, like he’s—like he’s-”

“Like he’s presented? He presented three years ago, you can’t hold him back forever, Katsuki.”

“I’M NOT HOLDING HIM BACK!”

Izuku cringes the louder and more vehement they get. He hates that they’re arguing because of him. He doesn’t like confrontation and he doesn’t want to be here, he just wants it to stop.

The thing is, Izuku recognises this. He sees what he never saw before in Katsuki’s angry fumbling and how he covers his lack of argument with just louder denials. His father is possessive and protective, Izuku has always known this about him. It’s something he’s come to accept, that Katsuki views Izuku as his, even if it isn’t exactly how Izuku wants to be so. But this is new. This isn’t just possessiveness or protectiveness: this is jealousy. This is Katsuki desperately hoarding Izuku to himself, like a dragon with his treasure.

This is Katsuki thinking that letting Izuku do this will somehow make him lose him, and he’s desperate to stop it.

“I won’t do it.” It takes a second for Izuku to realise it’s him who said that. “I won’t move up to the young adults section.”

“Izuku honey, what are you saying? You can’t model things for teens forever just because your dad is too insecure to let others see you as an adult.”

“Shut up, Hag!” Katsuki roars.

So it’s only Izuku who’s been ignorant about the real reason Katsuki hadn’t wanted him to move. Good to know.

“I don’t want to do it if it will make daddy angry at me.”

“Baby, that’s not-”

“I don’t want you to think of me as a slut!” Izuku cries. He still remembers his dad’s accusations when he found Izuku’s panties, which – without his interlude to the past – would’ve been a few days ago. “If it bothers you so much for me to just wear clothes aimed at my age group then I won’t do it! Just stop shouting, please! I only wore those underwear in the first place because Nana wanted my opinion on the comfort and functionality."

Katsuki’s face was the embodiment of remorse. “Oh, darling, I didn’t realise–” he sweeps Izuku into a hug and cuddles him close. “I didn’t mean what I said before. I just got so angry, I’m sorry. It’s no excuse, it’s just… I just can’t stand the thought of alphas seeing you like that. You don’t understand how disgusting and lustful they all are. They only think with their knots.”

Katsuki gathers Izuku up like he’s a pup and sits back on the sofa so that he can cuddle him close. He smells like contrition and regret.

Meanwhile, Izuku is going through intense vertigo as he remembers everything the younger and hornier Katsuki had put him through while in this exact same position.

“I think I’ve got some idea,” he says.

Under him, his dad goes very still. “What does that mean?”

“Nothing!”

They sleep in the same bed that night.

Izuku’s not sure how. He’s pretty sure he’d been heading up to his own room, but Katsuki had somehow herded him into his den. So now Izuku is lying under a duvet that smells of his dad while the real thing pulls him as close as possible so that Izuku's back is to Katsuki's chest.

“You’re close with the alpha next door,” Katsuki says, apropos to nothing. Every time he speaks his breath brushes against Izuku’s scent gland and it is very distracting.

“Yes,” Izuku mewls and squirms a little at the feeling. Katsuki places a heavy hand on his hip to hold him in place.

“Is he the one?”

“What?”

“Are you… dating him?” There’s a growl in the timbre of Katsuki’s voice and it makes Izuku’s entire body shiver. He feels like he’s going supernova.

Don’t slick. Don’t slick. Don’t fucking slick.

“I’m not dating him, daddy. He’s just my friend.”

“Hn. You’re not to be alone with him from now on. Or any alpha. Better yet, with anyone. Understand?” Izuku attempts to pull away and flip over to protest, but he’s suddenly pinned down by the weight of Katsuki’s body. Katsuki’s entire front is plastered to Izuku’s as he practically lays over him. “Understand?”

An alpha command. But not just that: the hard edge of teeth run over the nape of Izuku’s neck as Katsuki asserts the full weight of his authority over him as alpha.

“Yes! Yes, I understand.”

Izuku’s winces when he shifts. He’s wet.

His dad doesn’t say anything even though he’s got to be able to smell it. He just rubs Izuku’s tummy with one heated hand, wrist glands leaving trails of scent. “Good boy. Sleep now, baby.”

Izuku sleeps, still pinned under his father's heavy weight.

The bed is empty when Izuku wakes up the next morning. He shuffles and groans when he feels that his panties and loose bed shorts are soaked like he'd had a wet dream in the night. He's been so pent up since coming to the present that he's not even surprised, especially considering he was sleeping in Katsuki's bed. He just hopes Katsuki had already left before it had happened or at least hadn’t smelt it.

It's strange though, the most overwhelming scent on him is Katsuki and not himself. It must come from being in Katsuki's den. His fully grown pheromones were even stronger than his younger self's.

Blushing, Izuku quickly showers and creeps downstairs to the kitchen where the smell of pancakes originates. His dad must be in a good mood.

Only, when he gets there, the air in the kitchen is rife with tension. It’s easy to see why: Ochako has come home and she and Katsuki are engaged in a good old-fashioned glare-off over the kitchen island. Izuku isn’t entirely thrilled with the way Katsuki is holding the knife in his hand, so he rushes to intercede.

“Mum!” Izuku goes in for a hug, which she allows, although she brushes him off after barely a second of contact. “What are you doing home? I thought you were in Japan for…” one of her lovers' birthdays. “How was Japan?” He tries to recover.

See, Izuku and his mum don’t exactly not get on but they’re not very close. She spent most of his youth with her parents or out, living a decadent life on the Bakugou fortune. A young child hadn’t fit into that life, so, more often than not with Katsuki away at university getting his degree and masters, Izuku had been left with his grandparents. Katsuki had visited often: Ochako hadn’t.

It’s why Izuku had started to call Mitsuki ‘Nana’. He’d been confused and upset when he wasn’t allowed to call her mama, because he didn’t know who else was meant to have the title.

These days, Ochako pops back up when she feels like it. He doesn’t hate her but there is some form of resentment there. Mostly on behalf of his dad.

Because, the thing is, Katsuki and Ochako despise each other. They always have, for as long as he can remember.

Izuku honestly doesn’t know why they don’t get a divorce. The law had changed since they’d gotten married, which meant they didn’t have to stay together anymore. They already lived in different houses, and – although she kept the affairs well hidden – Izuku was sure Katsuki knew she was cheating on him. He just didn’t care.

So, more specifically, Izuku doesn’t understand why his dad hasn’t filed for one yet; Ochako wouldn’t get one unless it was financially beneficial for her to do so.

“Izuku,” Ochako says, eyes staying on Katsuki, “let’s go shopping together. Mother-son bonding time, yeah?”

Katsuki growls. His grip on the knife starts looking dreadfully threatening. “You just want to use his card. Maxed out your own already, bitch?”

She smiles with glossy pink lips. “Well, his allowance is five times larger than my own. Not that he would ever need to use it with you around him all the time. Isn’t that right, Katsuki?”

Ah, so that was the issue of the day.

“Izuku-baby, sit down and eat your breakfast. Bitch, get out of my kitchen.”

Ochako’s hands curl around Izuku’s shoulders as he obediently sits down. “Still just as controlling as ever, Katsuki. You’d think you’d have learnt better after the first time.”

Izuku has been hearing these sorts of taunts all throughout his life. Only now does he understand the origin and sees how it makes Katsuki flinch.

Oh, daddy, he thinks. Is my past self still such an open wound?

“Mum, go wait in the car. I’ll be right out, yeah?” he says. He just wants to get Ochako away from Katsuki.

“Okay, baby.”

That gets Katsuki to react. He snarls at Ochako for using his pet name for Izuku, low and threatening. “Get. Out.”

She holds up her hands, laughing. “Jeez, I’m going. I’m going.”

As soon as she’s gone, Izuku’s on Katsuki, nuzzling under his chin until the alpha relaxes with a sigh that ruffles the hair on Izuku’s head. “Sorry, darling. I know I said no more fighting. I just hate her so fucking much,” Katsuki murmurs.

Then why don’t you divorce her? Izuku doesn't bother asking, despite his intense curiosity. Katsuki has never answered before.

“I’ll keep her out of your hair, don’t worry,” Izuku says.

Katsuki’s arms come around to latch onto him, pulling him tight to the alpha’s chest. “I don’t want you around her. She’s toxic.”

“Only to you.” Not quite the truth but not entirely false either. “You know what she’s like, she’ll be gone in a day or two.”

“She’ll keep you away from me for all that time.”

“Well, she is my mother. She has a claim over me, just like you.”

It’s obvious that Katsuki doesn’t like Izuku categorising his parents’ claims over him to be equal in the muted growl and territorial scent he releases, but mulish silence is the only answer he gets.

Well, there goes any hope Izuku had of fixing their relationship. It’s clear they were never going to get on.

He ignores the tiny feeling of relief it gives him, and just focuses on how nice it is to be held in his daddy’s arms before he has to go and deal with Ochako.

After a full morning of Ochako gleefully using his card to shop, she finally relents and lets Izuku drag her into a restaurant. Of course, she demands that it be a five-star restaurant, but he had expected that.

The maître d', Sasaki-san, straightens up as soon as she spots Izuku entering, and they’re seated within moments in a little private nook. The tip he slips her has Sasaki’s smile perking into something much more real.

“Keep the wine coming,” he murmurs out of the corner of his mouth as she pulls out his seat for him.

She does. By the end of the meal, when he knows the waitstaff will no longer approach until one of them signals for them, Ochako’s cheeks are even pinker than normal. She’s on another diet and so had only ordered a salad, but she’s had most of a bottle of red to herself. It’s the perfect time for Izuku to ask the question he’d agreed to go on this shopping trip for.

“Mum, why do you and dad fight so much?” he asks.

Ochako takes a large sip of her wine, finishing off her glass. A waitress silently refills it with the last of the bottle and then backs away.

“I’m not the partner he wants, and he won’t ever let me forget it. He hides it from you – he doesn’t want you to see him as anything other than perfect – but it’s not just me instigating things. Believe me, Izuku, the hate is mutual.”

Izuku has to ask. He has too. “Why don’t you love me?”

She looks away. “I do–”

“Please don’t lie.”

Her hands fiddle with the stem of the glass. “You’re my child, but you look… you look just like Katsuki’s first love. He and I conceived you when Katsuki was mourning the end of their courting. You were born with all the same features, same colour eyes, same hair, same freckles even. Katsuki used to think you were some sort of miracle child – like the universe had given him the child of his true love to make up for taking him away. He even named you after him, did you know? It’s like the original Izuku is haunting me for stealing his alpha.” She looks so sad. “I’ve always been in his shadow.”

Izuku takes a gulp of the glass of wine Ochako had allowed him. Guilt hangs over him like a shroud and doesn't allow him to speak. But, a moment later, he regrets giving her the time to continue.

“Do you know how it feels to hear your future husband chanting the name of someone else, who just so happens to have the name of your future child, as he fucks you?”

Well, then.

“He adores you because you look like his first love. But even then, to begin with, he was no better than me at being a parent. For years he couldn’t stand to be in the same room as you because it hurt too much. It wasn’t just me that left you with your grandmother. He’d swing between being there for your every step and not being able to bear even looking at you.”

That hits exactly where she wants it to, because Izuku can't dispute it. Katsuki visited extremely often considering how busy his work had kept him, but he only became Izuku's main guardian when he was around 12 years old. Izuku just hadn’t known why. He hadn’t understood why his father looked at him so wistfully when he’d been growing up. It’s only now that he knows that Katsuki was lamenting a lost love.

Ochako looks like she’s finally tired herself out with her vitriol, so Izuku gestures to the waitress.

“Please can we get a bill, and can you order a taxi for my mother to the XYZ hotel. I think she needs to rest.”

The waitress spares a glance at Ochako, who’s slumping over her plate. “Right away, sir.”

Izuku makes sure that Ochako gets back to her hotel room safely. For the last few years, she’d taken to staying in the same one when she came to visit, as Katsuki never welcomed her into their house. If they’re lucky, she won’t pop up for another few days.

“Sweetheart!” Mitsuki calls as soon as he steps through the front door. “Just in time, I got the cook to make your favourite.”

Izuku sighs. If Grandma is here, it can only mean that his dad is staying late in the office to avoid any risk of running into Ochako. Sometimes, his parents acted just like 10 year olds in regards to each other.

Still, he’s glad to see Mitsuki. She gathers him into a hug and he collapses into it, breathing in her soothing smell. It calms his instincts to see her, like all the tension comes out of him. To the inhuman part of his brain that operates purely on pheromone memory, she is, for all intents and purposes, his primary parent; the one he goes to when everything is going wrong. And by god is everything going wrong.

“Hi, Nana,” he chirps into her neck. “Missed you.” He means it more strongly than she would ever be able to understand.

“My sweet baby, what’s wrong?” she asks.

He doesn’t try and fob her off by acting fine, she’s always been able to see right through him. “Nothing, just… parent drama.”

Her arms tighten. “They’re such shitheads aren’t they?”

“Yeah.”

“I hate that they get you involved like they do. Tugging you back and forth like a toy. You should come home next time they get like this. I’ll keep them both out.”

By home, she means her and Masaru’s house; the house Izuku had grown up in before Katsuki bought this place.

“Can I come back with you tonight and stay for a few days?” he asks. “Daddy will probably go off on some conference soon anyway.”

He just needs space. In the best of ways, Katsuki has been smothering these last few days, and it’s barely given Izuku time to process everything that’s happened. He needs time away from it all to sort himself out. Not just Ochako and her words, he needs time away from Katsuki.

Mitsuki pauses after Izuku’s question, her eyes flashing as she takes in the signs of Izuku’s weariness. Anger starts to cloud her features. None of it is directed at him: her voice is soft when she says, “Of course, sweetheart. You’re always welcome. Come eat dinner and then I’ll take you home.”

She seats him at the dining room table, waving away the servants in favour of privacy.

“I have to ask, did something happen?” Mitsuki asks as she serves them both.

Izuku plays with his fork instead of looking at her. “I went out shopping with Ochako today.”

“I heard. Katsuki was moaning about it until he left. Did the bitch say something to you again? If she did, I’ll–”

“It’s not like that,” Izuku cuts her off before Mitsuki can get going. “Just…” he can’t contain his curiosity. “Nana, why do you hate Ochako so much? Is it because she baby-trapped daddy?”

Mitsuki is so surprised by the question she actually puts down her cutlery. “No, sweetheart. That’s not why.”

“Then why?” he asks. ‘Weren't you the one who forced them to get married?’ he wants to say.

She hesitates for several seconds while Izuku waits. He knows she has more to say.

“I don’t hate her for baby-trapping Katsuki. I could respect a beta who secures herself such a prospect of an alpha in that way in order to ascend the hierarchy and secure themselves a better life. Katsuki should have been more careful. Don’t look at me like that, Izuku – he was aware of the risks and he had condoms on him when it happened.” Mitsuki takes a deep breath. “I don't like her because, despite bringing you into the world to get the lifestyle she lives, she has not given you one iota of care since then. You are undoubtedly her child, but if it weren't for me, you wouldn't have a guide at all. No one to teach you the ways of life for someone who’s not an alpha and to make sure you were safe and cared for.”

Izuku nearly cries. It’s like all the fractures in his family are orientated around him. Yet, he still can’t help but be so grateful that Mitsuki cares so much about him to be so offended on his behalf.

"But don't you feel at least a little bit angry that she took away daddy's choice like that?" he says.

"Not really.” Mitsuki shrugs. “You have to understand that it was a different time and that sort of thing was considered a common practice, if not basically encouraged to secure a good mate. Besides, it would've been hypocritical: Katsuki was trying to do the same thing, after all."

Izuku chokes on his drink. "Kacchan wanted to baby-trap Ochako too?" He splutters.

"Oh god no." Mitsuki laughs, finally starting to eat. Izuku copies her, barely tasting the food. "Not her. You remember how I used to tell you that before Ochako, Katsuki was in love with someone else?" Izuku swallows: he remembers vividly thank you very much Nana. "Katsuki tried his absolute best to knock that one up before he could get away." Izuku starts choking again, this time on his own spit, though Mitsuki doesn’t seem to notice. She’s too caught up in old memories. "Even fucked him during his heat. He was so unbearably smug afterwards, he thought he had him locked down for sure. No dice though, unfortunately. Funny that, it only took once with Ochako, and that was outside of heat and with a beta to boot."

Izuku brushes his fingers against his implant and sends a silent prayer blessing modern science for effective contraception. He remembers the swagger in Katsuki's footsteps in the days after his heat, he'd just thought it had been the week long marathon of sex getting the alphas mood up; so secure and complacent in the effectiveness of his implant that he’d cast aside even the possibility of a pregnancy. It had never occurred to him that Katsuki’s dirty talk might have meant more than just talk.

His cheeks flush with the knowledge that Katsuki had wanted to fuck a baby in him from the get-go. A part of him wonders if that’s why Katsuki had such a hard time meeting Izuku's eyes in the present, before rationality beats it back down.

"Ochako says that daddy resented me back when I was younger, ‘cause I remind him of his past love.”

“Oh, sweetheart, don’t listen to her. She’s got her own interpretation of the story and it’s skewed by bitterness. She tends to impose her own reactions and rationalisations as Katsuki’s. It's been so long that none of us, not even Katsuki, can even remember the previous Izuku’s face clearly. He had green hair, green eyes, and freckles, and we only remember that because those are the immediate traits we were able to compare between the two of you.”

On a side note, Izuku is so glad he’d had the forethought not to allow any photos in the past.

“The truth is, you were Katsuki’s greatest joy from the get-go,” Mitsuki says, and the gravity with which she says it compels Izuku to believe it. “Katsuki loves you for you. You brought him back to life after Deku left.”

“Really?” Izuku knows his voice is small and vulnerable.

Mitsuki laughs. “Really. You might as well have hung the sun and stars for how much he adores you, sweetheart.”

Izuku blushes. She just smiles when she sees it and goes back to her food.

“How much he adores you is the problem,” she mutters under her breath.

Izuku gets one entire day to himself at his grandparents’ house before Katsuki turns up, demanding his son back.

In that time, Izuku has had time to think. Not enough, but better than none.

The ache of leaving Katsuki in the past still hurts. He is a version of Katsuki that Izuku will never see again.

Don’t get him wrong, Izuku is so thankful that he is back in the correct time with his family, but he still mourns the boy in the past he fell in love with.

Mourns him even more, knowing the pain Katsuki went through as a result of Izuku leaving, and the scars it has left on him that linger even today. It tears his heart apart that he did that to Katsuki. Even as a small, guilty part of him revels in knowing that Katsuki loved him so much after just a month.

Now he’s back in the present and that romantic relationship is making him re-evaluate his relationship with his dad. Everything that he’d taken for granted, all the things that make up their relationship, Izuku can’t help but see through the lens of knowing that there is a version of Katsuki that performed those same things with the intent of mating Izuku. More than that, Izuku had reciprocated.

(Deep inside, unvoiced and ignored, Izuku knows that he still would reciprocate with the current-day Katsuki)

He’s only been back for a few days and it’s fucking with him. He doesn’t know where to go from here. He knows his daddy doesn’t want him like that; Izuku is just deluding himself with his own hope and he can’t let that continue. In the past, he promised himself that he would make sure that Katsuki was happy in the present with a partner who loved him and who Katsuki could move on with, even if it took fixing his parents’ relationship himself.

Even after one day of seeing them together again, Izuku can tell that it’s going to take a lot of work. And there is a part of Izuku that needs to be crushed, because it is happy about that.

It’s untenable. He owes it to Katsuki to make sure that he finds someone he can be happy with, because, even if Katsuki were remotely interested in Izuku like how he was in the past – which he isn’t – that person is not Izuku in the long-term.

Now Izuku knows it was him, he can’t help but keep remembering all the times that Katsuki used to stroke his face with a wistfully sad look on his face, while saying that Izuku reminds him of someone he used to know. Izuku owes it to the younger Katsuki to find him someone he’s happy with in this time. Even if it’s someone else.

There must be some reason Katsuki refuses to divorce Ochako. It’s the only hope Izuku has: there must be some spark of fondness left in that relationship. He’s going to make sure that spark blooms into a fire.

(Even if it’s for someone else)

“Katsuki, go home,” Mitsuki is near yelling at her son. “He’s upset, and he needs some time away–”

“Fuck off, hag,” Katsuki snarls back. They’re both trying to keep their voices down as to not alert Izuku that they’re fighting, again. “That’s exactly why he should be with me.”

“You and Ochako-”

“That bitch won’t get near him-”

“That’s not what I’m worried-”

“Izuku is happiest with me, how dare you steal him away-”

“Katsuki, you’re smothering hi-”

“It’s okay, Nana. I want to go home,” Izuku says, standing on top of the steps. Looking down at them reminds him too much of the prom from a couple of days ago, so he quickly runs down, his backpack thumping on his back. “I’m feeling better now.”

It’s a lie, but they’re not paying enough attention to him to catch it. They’re holding an entire silent conversation with their eyes above his head. Izuku hates it. It feels like more secrets are being kept from him. Before going to the past, he’d never realised how much his family hid from him.

“Okay, if that’s what you want. You know you’re welcome back anytime,” Mitsuki says, with a hard look in her son’s direction.

“Why the fuck would he need to come back to this shithole?”

Izuku’s sick of their arguing, so he shoves on his shoes and grabs Katsuki’s hand to pull him out of the front door and down to the car.

“Bye, Nana! See you on Thursday for family dinner!”

“Daddy, can you do something for me?” Izuku asks after knocking softly on the open office door.

Katsuki puts down his pen to survey him, sharp eyes raking down from the cold-shoulder soft-green jumper Izuku’s tucked into his A-line skirt and long socks. After a moment, he opens his arms and Izuku doesn’t hesitate a second to snuggle onto his lap. “I’d do anything for you, you know that.” Katsuki tucks his nose into Izuku’s shoulder where his jumper had fallen down and his eyes flutter shut, content.

“Go on a few dates with Ochako.”

“No, don’t want to,” Katsuki says immediately.

“Please, Kacchan? Just a few dates. I really think you guys should try and patch up your relationship.”

It’s on the tip of Katsuki’s tongue to say no, Izuku can tell. But Izuku pulls back from their hug to fix Katsuki with the saddest, most beseeching look he has. “Why not? Please, for me?”

His daddy has never been able to deny him anything.

He sighs heavily, already looking like he's regretting what he's about to say. “Fine. But you’re staying here while I work to make up for all the time I’m going to have to waste on her.”

Izuku can’t believe that it worked so easily. “Ok, deal,” he agrees, trying to pull away to sit on the couch in front of the fireplace in the office – the place where he usually does his homework while Katsuki works in the evening – but Katsuki doesn’t let him pull away. “Daddy?”

“On my lap, Izuku. I can barely smell you when you’re over there, what would be the point?”

“Oh, ok,” he says meekly, shifting to sit in a more comfortable position. His knees are either side of Katsuki’s legs, but Katsuki moves him so that Izuku’s weight is more firmly pressed on his thighs and Izuku blushes, acutely aware of the position they’re in. He wraps his arms around Katsuki’s neck and buries his face there, so that Katsuki can’t see his face and wonder why Izuku is so embarrassed.

Behind his back, Katsuki picks his pen back up after a few moments and continues to write. Then puts it down and starts to type.

Hmm, Katsuki smells so good. Warm and comforting, like a blanket.

In no time at all, Izuku falls into a doze. He’s awake, but only just. Therefore, he feels it when Katsuki shifts his weight and moves Izuku just slightly, just enough that the press of Katsuki’s hard cock under him becomes apparent. Izuku hadn’t realised it before, but with his short skirt the only barriers between them are his panties and Katsuki’s trousers.

Katsuki groans in the back of his throat when the heat of Izuku’s pussy settles over his cock, so guttural that Izuku can feel how it rumbles in Katsuki’s chest, purr-like. Abruptly, all he can think about is how it would feel to sit in this position with nothing between them, cockwarming Katsuki like a good little omega wife while he worked. Dozing while he kept his daddy’s cock warm and wet inside him, clenching over it, slicking around it. Maybe Katsuki would knot him, spilling come and keeping Izuku still so he could feel each and every spurt that made him swell with Katsuki’s claim while he continued his work. The thought gets him so hot he fears Katsuki will feel him burning up.

“Fuck,” Katsuki groans quietly. “Fuck, baby.”

Sleepiness and incredible luck are the only things that prevent Izuku from jerking in shock when Katsuki picks him up by the bum and places him on the desk, leaning forward to slowly lower Izuku’s back onto it and unlacing his arms from around Katsuki’s neck.

Katsuki moves away, but not very far, so that he’s hovering over Izuku. With his eyes closed, Izuku can’t see a thing, but he hears the sound of a zip being undone, and then a drawer being opened and something liquid being squirted.

From the slick sounds that follow, it’s pretty obvious that Katsuki is jerking off. Right there, looking at Izuku’s sleeping form. Only by some godly act is Izuku able to feign sleep and not blush.

Okay, so maybe his knees fall apart just a little bit. In a totally natural way.

“Fuck, baby. You look so good. How am I meant to even look at anyone else when you’re right in front of me looking like this all the time?”

The slick sounds pick up.

“I should come on you so those loser alpha extras from your school know to stay the fuck away. None of them are good enough for you; you must think I’m an idiot if you think I don’t realise something is up. No way am I going to lose you like this.” Izuku almost thinks Katsuki is actually speaking to him, but then. “God, sweetheart, I almost wish you were awake to see how hard you make me. You’re the perfect omega, how can I help myself? I’m only human.”

Thankfully for Izuku’s continued sanity, Katsuki doesn’t say much else. He doesn’t come on Izuku either, though he thinks it was probably a close thing from the hasty sounds of tissues being pulled out the box following a low groan that makes Izuku’s core throb.

He almost jerks when a thumb rubs across his slit, pressing against and then briefly under his sodden underwear.

“What a good omega, getting wet for me in your sleep. Always been so receptive to my pheromones, haven’t you darling?” The thumb retreats. “Taste as good as always, too.”

You’ve done this before, daddy?

Once he’s done, Katsuki doesn’t do anything else. He even goes back to typing, until he eventually shuts down his computer and picks up Izuku to take him upstairs to bed.

Katsuki takes Izuku into the alpha’s den and lays him down. Izuku waits until Katsuki has left to go shower, and then he flips over, flops face down on a pillow, and screams.

Was Katsuki attracted to him, or is it a further extension of his possessiveness? It was almost casual how easily Katsuki eased from working to jerking off over him. Was it just a case of him feeling horny and not caring that Izuku was there, or just using him as convenient eye candy to get going?

Fuck, alphas are so hard to understand.

Chapter Text

It is very obvious that Katsuki is not happy about having to take Ochako on dates. He heads out to each one with the look of a man on the way to the guillotine, but he still goes. That’s the important thing. 

Izuku isn’t as happy as he thought he would be, either. Between Katsuki’s busy job and the dates, they’ve been seeing each other much less. On the one hand, it’s been giving him time to himself to mourn and accept what happened in the past; on the other, Izuku really fucking misses spending time with his daddy. And he hates that it’s Ochako who gets to do it instead. 

It’s actually quite upsetting that Katsuki hasn’t been trying to balance his workload so as to spend more time with Izuku, just because he’s got someone else he can spend time with now. He never calls him into his office again. Instead, Izuku’s been eating alone for breakfast and dinner for the last week, only seeing Katsuki when he comes home from work and then leaves to go on dates. He hears him when he comes home though, drunk and stumbling. 

Out of some sort of petty feeling, Izuku has kept his bedroom door locked. Satisfied when he hears the distinct sound of an alpha thumping against it when he discovers Izuku’s not in his den. The beseeching whines that Izuku ignores, because every time he so much as approaches the door, all he smells is what feels like an entire bar-full of different omega and beta scents, overlaid with blood and alcohol, and it infuriates Izuku that Katsuki would dare approach him and his nest while smelling like that. 

Katsuki must have been going to Ochako’s parties with her. Izuku knows full well what happens at ‘all-natural parties’, as they were called. A remnant of ancient times where instincts are left to go riot. Fucking, fighting, even fleeing in the form of simulated mating runs could be conducted at these parties, where claim marks are ignored in favour of getting off with as many partners as preferred. It seems Katsuki and Ochako had finally found some common ground. 

Well, good for him. Izuku knew Katsuki had a high sex-drive. Maybe this would be good for him. Izuku was obviously nothing special, just a convenient omega in his house: something pretty to look at and smell or taste while he got off. It wasn’t like Izuku didn’t already know Katsuki found him sexually attractive. It just apparently wasn’t a hard bar to hurdle.

He fumes for an entire week. It all culminates when he watches as Katsuki leaves for yet another party, dressed like sex on legs and barely glancing at Izuku as he passes.

Something inside him snaps.

Fuck it. Fuck doing the right thing. Izuku wants what he wants, he’s already accepted that once. Coming back to the correct time period doesn’t change anything. Katsuki wanted him once, Izuku can make him want him again. Even if his daddy will never want him like that, Izuku has to try.

Ochako just isn’t good enough for Katsuki; maybe Izuku has been deluding himself into thinking she ever could be. 

The next day, Izuku calls Mitsuki and asks her to bring the contract for the 16 to 19 years old line around. 

“And, Nana,” he says at the end of the call, “I want to model the lingerie too.”

Her excited babbling cuts off. “... Are you sure, Izuku? Your dad-”

“Daddy doesn’t matter. This is my choice. Please send me some pieces ahead of time, I want to get used to wearing them… And send me the same pieces for Ochako too. I want to give her a gift.”

“... Okay, darling. I’m going to trust you to know what you’re doing.”

Izuku couldn’t have timed this better if he tried. He’s trying on a strappy red bralette/boyshorts duo made of silk lace that Mitsuki sent him when Katsuki slams open the door to his bedroom, a contract scrunched in his hand. He’d obviously just gotten home early from work, suit immaculate, but hair dishevelled as if he’d been running his hands through it.

Izuku’s heart slams in his chest in anticipation as he waits for Katsuki to react to what he’s wearing. 

But Katsuki barely even seems to notice. “What the fuck is this shit?” he roars, waving the contract in his fist. “Trying to sneak a contract past me at my own goddamn company?”

Izuku’s heart plummets. And then, just as fast, he gets angry. Katsuki could at least look at him properly. “This is my decision, Kacchan.”

“No, it’s not. I’m your alpha, which means any contract like this needs my approval – and I certainly do not give it.” Katsuki turns as if to leave. “Do not try this again, Izuku. You won’t like what happens next time.”

No. This wasn’t happening. The contract was meant to make Katsuki focus on Izuku, to see how desirable he was and how much Katsuki didn’t want him to slip away. Katsuki was meant to see that Izuku was moving up an age bracket, was starting to market to alphas; he was meant to come in and see Izuku in his lingerie and realise that Izuku was grown up now, was a desirable omega who could make his own choices.

This wasn’t meant to happen. 

Izuku sprints and catches Katsuki around the waist before he could close the door behind him, burying his face in Katsuki’s shoulder blades. “Daddy, please!”

Too fast for Izuku to comprehend, Katsuki swivels in his grasp and hauls Izuku up over his shoulder, walking into the room to throw him down on the bed. The springs creak as Izuku bounces once, twice, and then Katsuki is there, pressing him down into the duvet. 

“I will give you anything you want, Izuku, but I will never let you go on camera like that.”

“I’d do it well, I’m not a little omega any more! I’m over the age of presentation. You’ll have to let me go sometime!” 

That had been a slip of the tongue. Izuku had only meant that he’d have to model clothes for older omegas eventually, but it came out all wrong with the stress of arguing with his alpha.

Predictably, Katsuki doesn’t take it well. His hands slam either side of Izuku’s head, Katsuki’s face hovering so close their noses brush. “I will never let you go. I don’t care what I have to do, you will always be my little omega, understood?”

That’s not a normal thing to say to your son, daddy. Izuku squirms, thighs rubbing together as he bares his neck in submission even as elation runs through him: Katsuki must feel something for him that isn’t purely familial. “Yes, daddy. Sorry, I didn’t mean it like that.”

He gets a savouring lick over his scent gland in reward. “Good boy. Forget about modelling in the future, we don’t need the money anyway, I’ve got more than enough. I’ve let that hag get away with showing you off for too many years now.”

Izuku frowns; that was the opposite of what he wanted. “I like doing it though? And I’m the face of the company.”

“We can get someone else,” Katsuki dismisses, and it's a hit on Izuku’s pride in a place that he hadn't realised he holds in such esteem. It wasn’t easy for just anyone to be the face of a major fashion house, especially one like Daibaku, and it isn't something Izuku wants to just give away. He takes pride in doing what he does. 

“I’m not stopping.”

“Izuku,” Katsuki growls.

“No, Kacchan. I’m continuing it. You may think I’m easy to replace or whatever” - and doesn’t that hurt? – “but I like doing it. I like the independence it gives me. And I like the confidence it gives me too. I won't let you take this away from me just because you’re – I don’t even know your angle here, but I’m not going to let you stop me.”

It's a bluff. Katsuki very easily can stop him if he truly wants to, but Izuku is prepared to throw the hugest tantrum in human records if he tries. And he’d also tell on Katsuki to Mitsuki. She wouldn’t let him take away the face of her fashion house. 

Judging from the irritation on Katsuki’s face, he can already predict what Izuku’s plans are if he tries to force the issue. Finally, after glaring at each other for what feels like minutes, Katsuki slumps. “Fine.”

He gets off of Izuku, much to the omega’s dissatisfaction, and only then seems to comprehend what Izuku is wearing. 

Katsuki’s eyes go wide and he stops breathing. Izuku preens. 

“Do you like it? I was practising for the shoots – not that it’s going to happen now, seeing as apparently I’m not good enough to model them for Daibaku,” Izuku says with spite. And then an idea comes to him. “Ah, well, I’ll just have to wear them for someone els–”

“Finish that sentence and you’ll be home-schooled for the rest of the year.”

Izuku’s mouth snaps shut.

With his back to Izuku, fists clenched at his sides, Katsuki says, “For the record, I didn’t want you to model them because I knew you would look too good in them, not because I thought you wouldn't suit them at all. And I was right, you look more enticing than sin like that, my darling." 

“Daddy-”

“I’m going out tonight. Keep the doors locked and don’t leave the house. The maid will make you dinner before she goes home.”

With that, Katsuki strides away. Soon, the rumbling of his Jaguar can be heard as he rockets down the driveway. Izuku just knows he’s off to one of those all-natural parties to fuck away his stress. He punches his pillow with frustration.

Izuku can’t decide if he’d won or lost that argument. 

He wonders what Katsuki will do when he sees Ochako in the same pair of underwear tonight. He selfishly hopes Katsuki thinks of him. 

After all, it’s why he gave them to her.

Perhaps it’s not surprising that Izuku’s heat comes on quicker this month. 

He’s alone in the house when he first notices the signs. After their fight, Katsuki’s been gone for days on some sort of business trip, and Izuku has been coping by nesting in his den with any scrap of clothing he could find that smelled like Katsuki. He’d thought it was just the usual moodiness from being separated from his dad that had him so down. He should’ve known better. 

He should call Nana to come and look after him like he always does, but that’s a lot of effort for someone who just wants a coke can-sized cock in his pussy as a matter of urgency. Izuku thinks about it until a wave of cramps hits him and he’s in too much pain to think about much else. 

Up till now, Izuku has always spent his heat in his own bedroom, not that he can’t leave, considering blockers and suppressants, but he prefers to be close to his nest if possible. It’s specially kitted out to block any pheromones from escaping and contains everything he’d ever need during his time there. The room includes a mini-fridge of water and snacks that his dad usually tops up when he knows Izuku’s cycle is coming. 

Usually, Katsuki tracks Izuku’s heats with the fervid attention to detail of an astrologer in ancient times using the stars as a prediction for the whims of the gods. It means Izuku doesn’t really need to pay as much attention as he otherwise should; even if he didn’t track the days between cycles, Katsuki is so attuned to Izuku’s scent that he can usually smell his heat coming within days of it starting. It means he can take his suppressants before the main symptoms even have time to emerge. 

It’s a sign of how busy Katsuki has been that he’s completely forgotten about Izuku’s heat. 

School is closed for the holidays, so luckily he has the rest of the week off anyway. No home-schooling needed. It’s probably for the best, Izuku doesn’t think he could focus on anything other than getting as many fingers in himself as possible anyway. 

Heat isn’t usually like this for him. Perhaps he should’ve realised it would feel different after sharing his last heat unsuppressed and with an alpha. 

Miserable, he forces himself to swallow some suppressants. It’s a little too late for them but with no-one around to help him he hopes they’ll alleviate the heat just enough that he can retain his mind and not go into an instinct-driven daze. He curls up in his nest in Katsuki’s den and knows it’s useless. Already, he can feel himself slipping. The scent of alpha is too much. Especially the scent of the alpha who last took Izuku through his heat and who Izuku would very much like to be here for this one. 

Riding his fingers, Izuku cries for his alpha. Desperate for his knot. 

Katsuki doesn’t come. Neither does Izuku – he can’t.

Izuku’s mind slips. 

The omega feels the bed dip. A hand curls into his hair and Izuku chirps as he curls into the hand, scenting at the wrist. Daddy. 

“My poor baby. Why didn’t you call?” 

Izuku's exhausted and doesn’t feel like speaking, so he’s glad when he hears the rattle of the suppressant bottle as Katsuki picks it up. 

“Got them too late, huh? I’ve been neglectful, I should’ve known your heat was coming. But I’m here now.” Izuku’s duvet is pulled away from him and he hisses in response. “Shh, you need to drink something, darling.” A straw is pushed against his lips and he guzzles down the water. Daddy rubs his wrists against his jaw as he drinks, occasionally slipping down to feel how Izuku’s throat contracts as he swallows. “Good boy. Did you take a little tumble into your instincts?”

In response, Izuku finishes the bottle and starts pulling Katsuki further into the nest, mewling. Now that he’s drunk something the heat starts furling under his skin again and very quickly his entire body flushes. His daddy is here now so he can do his job and make it better.

He flips over onto his tummy and tries to get his knees under him to present properly. Daddy won’t be able to help himself if he sees how Izuku’s slicking for him, wet and open and so ready for his knot. The camisole and little soft sleep shorts he’s wearing will barely get in daddy’s way; he can just pull them away. 

Daddy groans when he sees what Izuku’s trying to do and pushes him down flat on the bed before he can get to his knees. “None of that, you little minx. Maybe it’s a good thing you won’t remember any of this. You need to stop tempting me before I’ve gotten everything sorted out.”

Sorted out? 

Izuku should probably care what he means by that, but all he can process is that, for some godforsaken reason, Katsuki is denying him. 

“No, no, baby, please stop whimpering like that. My heart won’t be able to take it. Fuck, I should’ve sent mum. I’ve resisted for years, I can’t break now.” As if to prove his resolve Katsuki backs away entirely until he’s almost as far from the bed as possible. 

Devastated, Izuku turns on his back. He reaches out for Katsuki with both hands. Katsuki looks tempted, but doesn’t approach further. So, quick as anything, Izuku pulls his own shorts off and spreads his legs, using his fingers to spread his lower lips and show daddy where he’s dripping for him. He can feel how his pussy contracts around nothing. Katsuki can’t look away and Izuku is sure he’s got him. 

“Fuck, this isn’t fair,” Katsuki growls around a mouthful of fangs. He’s drooling, venom leaking down his chin. He doesn’t seem to notice. He’s wearing his usual suit, looking flawless and powerful if it weren’t for the obscene tent in his trousers. 

“Daddy,” Izuku whimpers. He can make words if it’ll get him a knot in reward. “Daddy, I need your cock. It hurts.”

Katsuki’s face twists into something savage. He starts to creep closer. “I know you do, baby. You must feel so empty. You need daddy to make it better, don’t you? Need me to hold you down and fuck you until you can’t even scream anymore.”

“Yes! So badly.”

“You’ve never even had a cock properly inside you and yet you think you can take my knot first time?” Izuku vigorously nods his head. He knows he can. “Oh, baby, you have no idea how badly I want to. It’s been hell these last few months. Don’t know how you haven’t noticed.”

Why is he talking so much? Izuku doesn’t understand why he doesn’t have a knot in his pussy yet. “Daddy, please help me, I’m so hot inside it hurts. I’ll be so good, promise.”

“You’re always my good little boy, aren’t you?”

“Mmmh!” Izuku rolls his hips in the air. Slick drips from him under Katsuki’s watchful eyes and his fingers slip from where they’re framing his hole. One finger just slightly penetrates him and the relief is instantaneous and yet not nearly enough. It just makes him burn hotter, his entire abdomen feeling like it's melting, his cunt thrumming with need. “Please!”

Katsuki catches himself just before he’s close enough for Izuku to snap out and trap him with his legs. His eyes are molten. “I really wish I could, but you’ll be able to smell me on you for sure. Once I start, I won’t be able to stop, and I can’t hide a whole belly-full of cum from you. Even you’re not that oblivious.”

“Daddy!” Izuku whines. He’s not listening, he’s just burning. He starts sobbing with frustration and need. “PLEASE!” 

“Fuck — fuck it.” All of a sudden, Katsuki is on all fours above him. He rips out Izuku’s fingers and replaces them with two of his own. They’re so much thicker than his own but with how wet and mouldable he feels right now, Izuku takes them easily with a relieved groan. They feel so much more satisfying than his own. It only takes a couple of thrusts, a crook of fingers, and Izuku is shuddering and squeezing as he comes. 

When he forces his eyes open, Katsuki is watching, enraptured. “First time on my fingers. It was just as pretty as I imagined.”

“Daddy,” Izuku croaks. He still feels so empty; the orgasm was about as fulfilling as a sip of water after not drinking for days. 

“You asked me once before why I went away for your first heat. You’re about to find out.” Katsuki hurriedly sheds his trousers and shirt, revealing acres of tanned skin and defined muscles. Izuku salivates and can feel a trail of slick leak from him. “Well, not that you’ll remember. I really wanted our first proper time to be when you’re coherent, but you just had to tempt me like this, didn’t you?” The head of Katsuki’s cock is guided to Izuku’s slobbering cunt and he can’t help his eager whine. “I promise I’ll make this up to you, darling. I just need to fuck you once or twice before I die of blue-balls. You’ve always been so bad for my self-restraint.”

The head pushes in, thick and fast. It occurs to Izuku that he hadn’t managed to catch a glimpse of daddy’s cock, too dazed and anticipatory. Oh well, it doesn’t matter. No matter what, he’s got a feeling daddy will make him take it anyway, there’s no use in worrying about the size.

It definitely feels bigger than it was in the past, as impossible as that is. It fills him so absolutely and completely that Izuku writhes in place until Katsuki has to hold him down, wrists held above his head with one of Katsuki’s. Katsuki’s other hand flexes around his waist, holding his hips still and not allowing him to draw away. “Halfway there, darling. You feel perfect around me, like I knew you would. You were made for me.”

Every vein and curve of Katsuki’s cock is both perfect and too much all at once. Izuku comes again before Katsuki is even fully settled, his legs squeezing around his daddy’s hips. Katsuki’s eyes flutter as he feels how Izuku quivers over his cock, pushing in faster as he forgets to pace himself, so fast it starts to burn. “You’re doing so well, my darling. One last inch and you’ll have all of me.” 

Izuku screams as he takes the last – it wasn’t an inch, it couldn’t be just that little. Daddy’s cock is immense, veiny, curves slightly up, and there's a bump at the base where his knot starts. It hasn’t even inflated yet and it’s already stretching Izuku that little bit further. His pussy pulses as it tries to adjust to being held open by something so large, the tickle of Katsuki’s pubes against his lips and clit just that much more sensation. Izuku comes again and feels how the space where his and Katsuki’s pelvises are pressed together becomes soaked. 

“Holy shit, did you squirt just from me putting it in?” Daddy sounds so proud. He rewards Izuku with little nips against his scent glands. “That’s so hot. That’s three orgasms before I even started fucking you for real. I guess I’ll have to pay back the favour. Two or three knots should be just about enough to hold me through the next few weeks.” A thumb brushes thoughtfully over the raised bump of the implant on Izuku’s bicep. “I can’t breed you for real just yet, so you’ll just have to give me the next best thing.”

And then something strange happens. 

A tingle at Izuku’s chest that he hadn’t been able to feel over the assault of taking daddy’s cock reaches a climax of some sort. It’s uncomfortable, but the pressure releases quickly and he can feel the tickly sensation of liquid dripping over his chest. 

“Oh, baby. You’re gonna fucking kill me,” Katsuki rasps like he’s dying. “Holy fucking shit, you’re so perfect, making heat milk just for your alpha. Daddy’s been hoping and trying for this for so long.” Katsuki’s mouth on his chest feels so good that it makes Izuku cry out. It’s like there’s a direct line of stimulus from his tits to his cunt, every suck on his nipple makes his insides go squirmy around Katsuki’s cock. His tummy feels like its melting and, unconsciously, his hips start to buck as much as he’s able, fucking himself incrementally on Katsuki’s cock. The feel of it stutters between pain and pleasure like a candle in a breeze until, slowly, the burn transforms into a pleasure so sublime that he briefly feels like he’ll faint from the headrush.

Nursing Katsuki like this, having the alpha worship his tits with each suck and corresponding pleasure-filled groan while he warms his hard cock, feels so right.

Still suckling, Katsuki hips start thrusting shallowly like he can’t help himself. “You’re delicious, baby. Better than I ever imagined. Could just stay here forever, cock warm in your cunt and sucking your tits, but I don’t think I’m going to be able to hold myself back. I’ll have to come back to these later.”

Unknowing of Izuku feeling like he’ll float away if he feels much more sensation, Katsuki pulls out until just the bulbous head of his cock is inside and then immediately thrusts back in, making them both wail. He keeps the pace, the rock of his hips so strong that the entire bed moves and the headboard knocks into the wall, surely alerting everyone in the house about what is happening, if the loud moans weren’t enough of a clue. 

As if he had been searching for it, Katsuki changes his angle just enough that the head of his cock brushes against Izuku’s g-spot with every thrust, and the world splinters. 

Izuku releases a strangled scream, his body a line of tension. At some point, Katsuki had let go of his wrists, and the omega takes full advantage of this. Feeling like he’s going crazy, camera-flash spots popping in his eyes, Izuku wraps his arms around Katsuki’s sweat-slippy shoulders and holds on for dear life, clawing and biting at him like a wild thing. Heedless of this, Katsuki fucks like a machine, all indomitable strength and relentless energy, predatory grin hidden with Izuku’s face stuffed in his neck, and it’s too much. It’s too much of a good thing. Heat makes omegas sensitive, but Izuku thinks that even without it he’d be going insane. 

Just when he thinks it can’t get worse, his entire body jolts as the quickly inflating knot pops into the tight clutch of his cunt. Grunting, Katsuki doesn’t let the extra width hold him back as he immediately rips it back out of Izuku's sloppy pussy and then back in, his pace speeding up as he hurtles towards his end. He draws himself out of Izuku’s arms and straightens up, hands on Izuku’s hips slamming the omega down on his cock, red eyes gleaming almost sinisterly as the alpha watches himself fuck Izuku with his knot, obsessively tracing every agonised twitch of Izuku’s face. 

“Daddy,” Izuku sobs, "it's too much." The rim of his cunt burns, and yet slick sluices out of him endlessly and coats the growing knot. He tries to turn on his side, as if to claw himself away.

Katsuki gets a hand on the nape of Izuku’s neck, instantly turning him limp and he whines, scared. “None of that now, baby. You asked for it, so take daddy’s knot like a good boy. This is for your own good.”

Helpless, the omega just has to lie there and take it, scruffed into forced total relaxation as his cunt leaks around something far too large to comprehend. Katsuki doesn’t seem to mind pushing past the resistance of Izuku’s body, too intent on fucking his knot in and out, a stuttering growl rumbling from deep within his chest.

Stars behind his eyes, heartbeat pounding in his ears, Izuku comes to a screaming orgasm. 

The knot pops once more –it’s so big. It hurts. Daddy why aren’t you stopping?– pressing against a band of muscle deep inside his cunt, searching for a lock, and Izuku – slips. Retreating even further into his instincts in an attempt to protect himself. 

The omega doesn’t remember what happens after that. 

Moments slip through.

A cock so deep in his pussy he’s sure it’s pressed right up to his aching cervix; a hand on his nape scruffing him and forcing his limp body to accept a pulsing knot endlessly spurting come, so gargantuan that he thinks he might have blacked out to protect himself from how it makes his sanity fracture with pain turned pleasure; his cunt somehow successfully locked around it, suckling and squeezing for more as a thumb rubs relentlessly against his clit and a mouth nurses his nipples; thunder under Izuku’s chest as daddy rumbles a list of commands straight into his ear. The omega listens carefully, committing each to the type of subliminal memory that belongs to instinct and not thought. 

“You will not let anyone else touch you like this.”

“You will not let any other alpha fuck or knot you.”

“You will not seek out anyone else as your alpha or daddy.”

When daddy finally seems pleased and starts rolling his hips again, the demands turn to questions. 

“Would you let daddy fuck you when you’re not in heat?”

“Would you let daddy knot you when not in heat?”

“Would you let daddy claim you when not in heat?”

To each question, the omega nods frantically.  

There’s a roar, teeth at his throat that are ripped away at the same moment, and then Izuku is fucked back into the mattress, screaming his delight alongside Katsuki. 

He's knotted again as reward for his obedience to daddy’s commands. A hand around his throat as Katsuki pumps him back and forth around the thickest swell of his knot until it finally latches in. A hand smoothing down his belly, whispers of awe at his beauty and perfection that make his omega preen, proud of being so good for daddy. A mouth nurses at Izuku's tits, slurping and sucking so strongly that Izuku can't help but clench down on the knot inside with every suck, massaging spurts of come into his swollen belly until his tits run dry and Katsuki is crooning and nuzzling their slight swell in disappointment, his eyes glazed over and pupils dilated massively. Despite this, the alpha is notably more docile than earlier, the milk doing its job to gentle him and give Izuku's body some respite between rough cycles of fucking. 

A heavy weight presses Izuku into the mattress as he sleeps, still knotted under his alpha’s body weight. He likes it, the feeling of being covered completely and protected. Like this, he instinctively knows that no one would be able to steal him from daddy without Katsuki being alerted immediately. 

He wakes up in a different position to the one he fell asleep in, a half deflated knot being pumped in and out of his messy cunt with wet sounds of frothing come and slick. From the rawness of his pussy, Katsuki must have fucked him when he was asleep, and is now ready to go again. The almost gentle cuddle fuck would've sent him straight back to sleep if it wasn't for how the soreness and fullness from their previous session of sex made every deep roll of Katsuki’s hips light him up inside with pain masquerading as pleasure. Izuku’s heat-stricken mind doing its best to make sure that the drive to breed feels good. 

Too oversensitive and fucked out to contribute, Izuku can do nothing but lie there and take it submissively. Katsuki’s teeth scruffing deep into his nape to make him lie limp and floaty makes him think the alpha wanted full control anyway. 

Afterwards, knot locked deep inside and tummy starting to strain around the come daddy was continuously pumping into him, Izuku listens deliriously to Katsuki’s fevered mutterings. 

"So good for me. My perfect baby boy, so pretty on my cock, sucking me in so deep, milking my knot insatiably. It's like your pussy never wants me to leave, it grips me so tight. You want your daddy in you all the time, don't you? I raised you so well, such a needy little thing. Been dreaming of taking this pussy for years; I wonder what you'd do if you knew all the things I've done to you when you were sleeping. Don’t know how you expected me to resist, falling asleep so trustingly in my den. But you know that daddy does these things for your own good, don’t you, baby? You need me to look after you. Just like how I’m taking care of your heat now when you were silly enough to forget your suppressants."

A hand reaches around and starts to massage his bloated stomach. “This is going to take some work to hide. Can’t have you too suspicious until you agree to be mine, but I think I deserve some leeway for resisting for so long… Go back to sleep, baby, daddy will fix everything after he’s done.”

Content, the omega falls back to sleep.

He stirs just enough later, aching all over, to register being lowered into a steaming bath that smells alarmingly like nothing. His nose curls at the novocaine numbness of scent neutralisers but he’s forced in regardless. Daddy’s holding him by the thighs in a full nelson that he can’t remember being forced into but likes anyway because only a strong alpha would be able to hold him so easily. His chest feels raw, his tummy achingly full and his pussy is plugged with a giant knot that doesn’t let even a little bit of come out. Unfortunately, it slowly deflates. The omega fusses when daddy forces his swollen folds apart and fingers cum out of him, slow and careful and paying special attention to his clit as Katsuki palpitates his swollen womb, until the omega feels like he’s coming every minute or so. Slowly, his furiously sore body relaxes into the heat of the bath, head lolling back on daddy's shoulder.

A kiss is pressed to his throat, and he feels the scrape of fangs. “Shh, baby, it’s okay. I’m sorry, I know you want to keep my cum inside like a good omega; believe me, having to take out all my hard work is painful for me too. I promise I’ll give you all this and more soon, but for now I need you to go to sleep.”

The omega knows this command and has been conditioned to respond, and so he does as daddy says and goes to sleep. 

When he woke up from his heat, Izuku felt like he’d been hit by a goddamn tank. 

He flushed with the memories of some of the delirious dreams he'd had featuring his dad during his heat. Hazy dreams of knots and animalistic fucking, over and over again until Izuku was little more than a cum-stuffed knot toy. He couldn’t believe how filthy his imagination was. He must have been so pent up after coming back from the past.

He groaned as he forced his eyes open. It took way more energy than it rightfully should’ve. His entire body ached fiercely, but nowhere near as much as his pussy. It felt like he’d been cored out. He shifted onto his side and groaned again, sounding like a zombie as he forced himself to sit up, the duvet falling down to his waist as he stretched his arms. 

There was something inside of him.

He was in his nest in daddy’s den, naked. The nest smelt fiercely like them both as a consequence of the entire basket of his dad's dirty laundry he'd stolen for his nest, but most overwhelmingly like his own slick. Empty water bottles were scattered on the side, wrappers of heat bars that had only half been eaten, and, when Izuku lifted up the covers, there was a large orange dildo still half inside of him, covered in slick. 

Izuku had never owned a dildo before.

When he looked back up, Katsuki was leaning against the door frame looking suspiciously like he was trying not to smile and Izuku quickly pulled the duvet back down. There was a strange smugness to Katsuki. He was also only wearing an apron over his workout leggings and Izuku had to consciously swallow his saliva. His pussy gave a valiant throb around the dildo – oh, that hurts – at those biceps and pecs. “I thought I heard the moans of the dead coming from here so I figured your heat was over.”

“Daddy? When did you come home, I thought you were at a conference?”

Katsuki crossed the room and squatted down at the side of the bed to run his hand soothingly down Izuku’s back, lingering just above his buttocks. Izuku shifted and then stilled, overly conscious of the fake cock that Katsuki didn’t know was inside of him and how much Izuku wanted to pull the alpha down into the slick-sodden nest with him to replace it with the real deal. 

How could Katsuki act so normal when everything smelled so strongly of Izuku’s slick mixed with Katsuki's territorial scent? 

Izuku wondered how Katsuki felt seeing a nest built out of their shared belongings, somewhat embarrassed by how needy he seemed. He hoped that Katsuki just thought it was a case of an omega needing any safe alphas scent for their heat and not that Izuku desperately wanted his daddy's cock shoved up him until his stomach showed the outline.

“We finished early, luckily. I got back about midway through your heat, do you remember?”

Izuku cringed but shook his head no. “What happened?”

“It was too late to suppress, so I got Nana to come and get you the stuff you needed to get through it.” 

Well, that explains the dildo. She's gone for a bigger size than the one she got him in the past.

“Ah, tell her thanks. And sorry for taking your den, daddy. I didn’t realise it was coming and by then it was too late to get to my room.”

Katsuki smiled; there was just a hint of fang. “Don't apologise, I wasn’t put out at all.” He ducked his head and stood, walking towards the door. Izuku gulped as the rippling muscles of Katsuki’s back were revealed, only the laces of the apron covering it. Then he felt a cold kick of rage when he registered livid red lines clawed into his shoulders. 

Katsuki had been to one of those fucking all-natural parties, fucking someone else, when he could’ve been with Izuku while he was in heat and needy for him. The bastard.

“I’m making dinner. You should go get showered before coming to eat. You reek.”

“Thanks, Kacchan,” Izuku deadpanned, barely holding in his anger.

As soon as Katsuki was gone he pulled the dildo out slowly, groaning into a pillow that smelled of Katsuki as his pussy tried to cling to the too-thick width of it. He ached horrendously, and he supposed he must have gone too hard with it during his heat, especially when, once it was out, it was followed by a thin stream of weirdly thick, congealing slick. He didn’t dare breathe in too deeply; the room was already making his head spin with the strength of his heat pheromones and Katsuki's scent on the clothes he’d stolen. 

He headed directly to the bathroom. He was filthy, after all. There was a crust of dried slick all over his thighs and fresh wetness gushing out of his gooey folds. Moreover, a shower would give him a good chance to let go of his rage before being faced with Katsuki again. 

He spent a long time in the shower, turning the pressure up so high on the rainfall showerhead that he was about two seconds away from disintegrating into the water. The massager heads Katsuki had installed after Izuku’s first heat had him swaying in place from sheer relief. 

When he emerged, he realised he’d forgotten to get a towel or anything to change into. However, there was a dark orange one laying on the side, along with some clothes. Katsuki must have come in at some point to leave them for him. 

Izuku blushed, glad he hadn’t decided to masturbate or something. The only thing separating the shower from the rest of the room was a clear glass wall. Katsuki must have come in when Izuku’s eyes were closed. 

How long did he stay in here? Izuku wondered. Was it wrong that it turned him on to think of Katsuki watching an oblivious Izuku washing himself? Covetous eyes tracing wet limbs and flesh his father had of course never touched. Mouth dry, imaging Katsuki coming into the shower with him and running soapy hands up and down, over his strangely sensitive nipples, down and over his ass, gripping and squeezing, before going for his pussy. Getting two fingers in his swollen, leaking folds and stretching…

Izuku buried his face in the towel. Jesus, has he always been this horny?

But even that attempt at a reality check didn’t help. The towel smelt overwhelmingly of Katsuki. Had he accidentally left his own out for Izuku to use?

Not wanting to read too much into it, Izuku dried himself, shivering at how it put a trace level of Katsuki’s scent on him, and started to pull on the clothes. 

Wait a fucking second.

Izuku held up the flimsiest pair of open-back, blood-red panties he’d ever seen. They were accompanied by a loose pair of soft shorts and what was definitely one of Katsuki’s massive hoodies. Underneath, previously hidden, were a pair of long socks. They looked like thigh highs and were accompanied by a garter belt that they could clip onto that matched the panties. 

Okay, what???

For several moments, he just stood there holding the panties in one hand and the jumper in the other. Even from this distance, he could smell that the hoodie was practically saturated in Katsuki’s scent. The only way it could be stronger was if Katsuki had come on the damn thing. 

Izuku didn’t want to read into things and if the panties and garter weren’t there he wouldn’t be questioning it at all, it was an outfit Izuku would normally wear at home, but all together it was a little suspicious. 

But the more he thought about it, the more he thought he might be overreacting. The hoodie could be explained by it being Katsuki’s favourite and so heavily worn by him. Or perhaps it was meant to be in the wash and Katsuki didn’t realise how strongly it smelt in favour of giving Izuku something soft and comforting to wear. Or, even, an alphas scent could help calm an omega after a heat.

The panties though… the garter… Izuku was having a hard time logically rationalising those. 

Nonetheless, he put the outfit on. Daddy wanted him to wear it, after all. The jumper was soft and the scent made his instincts melt into a compliant puddle. So much so that Izuku had to fight the heaviness of his eyes when he went searching for his dad. 

He found him making dinner in the kitchen.

“Daddy?” Izuku yawned, covering his mouth with a sweater-covered hand. 

Katsuki glanced at him out of the corner of his eye, before looking back at the carrots he was cutting. If Izuku didn’t know him so well, he wouldn’t have been able to tell that Katsuki had tensed after looking at Izuku. But Izuku knew this man more than anyone. 

“Mmm, what is it, ‘Zuku?”

Now Izuku was here, he found himself fiddling with the edge of the hoodie. It went past midthigh on him, covering the shorts and leaving just the bare inch of skin between where it ended and the thigh-highs started. It was such an awkward question, but he couldn’t bear not knowing. “Why did you… why did you leave me the–” he was blushing. “The – the panties.” He whispered, face nuclear-warning red. He picked at the soft straps connecting the garter to the thigh-highs. “I thought you didn’t want me wearing… things like that.”

Katsuki’s shoulders tensed even more. The thuds of his knife started getting louder, as if he was putting more force into his chopping than necessary. “I don’t.”

“Then why–”

“I don’t want you wearing them for photographs, for other people to see,” Katsuki says, chopping getting even louder. The carrots were starting to look like mush under his hands. “If it’s at home, with me, then it’s fine. You want to wear them, so you can. I’ll get you as many as you want.” He stopped chopping. “But only when you’re at home, understand? They’re not for you to wear on dates. You’re not old enough. Promise me, Izuku.”

The successive commands were completely over the top, and he definitely was old enough to date, but still, “I promise.”

“Good boy.”

Weak-kneed, Izuku sank down onto one of the stools at the kitchen island to watch as Katsuki finally stopped decimating the carrots and moved onto some parsley.

“Here, taste this.” Izuku was going to approach, but Katsuki was somehow already in front of him. Izuku swivelled around and opened his legs on habit to let Katsuki get as close as possible, an invitation that the alpha took full advantage of. A spoon was thrust into his face. “Open.”

Izuku opened his mouth, and Katsuki maintained eye contact as he spoon fed Izuku the contents.

Fuck, why is this hot?

“How is it?” Katsuki asked. 

For the life of him, Izuku couldn’t remember even tasting it as it went down. 

“Er… it needs some more salt.”

Katsuki clicked his tongue. “Thought so.” 

Izuku thought that might be it, he might just get away with this, but Katsuki didn’t retreat. He placed the spoon down on the side, eyes raking slowly over Izuku’s outfit. “You look adorable, baby-boy,” he said in the tone of voice that Izuku had come to associate with being dragged into some private nook and coming out with come running down his thighs or chin in the past. 

ABORT. ABORT. ABORT. Izuku screamed internally.

“Well, you did choose my outfit,” he tried to say as casually as possible. His voice treacherously wobbled.

Katsuki’s hands landed on Izuku’s thighs, fingers plucking at the straps of the garter as he crouched down to get in his space. “I guess I did.” His hands roamed up, under the hoodie to toy with the loose hem of the shorts, fingers slipping under and moving dangerously close to the direction where Izuku was starting to feel wet and volcano hot. “How are the panties? Comfortable?” His long fingers reached the vee of Izuku’s pelvis, feeling the straps. Izuku didn’t dare to squirm, it would take just the slightest move to the side and Katsuki would be touching his mound. “They’re not too small? Straps digging in?”

Izuku had to bite his lip to keep in the whimpers. “No,” he mewled. 

“Do they make you feel good, baby?”

“Y-yeah.”

“How do they make you feel? Daddy chose them specially.”

“They make me feel…” 

“Make you feel…?” Katsuki prompted as his fingers ran up and down the junction of Izuku’s thighs, so close to where Izuku wanted him that it was driving him insane.

“Sexy. They make me feel sexy, daddy.”

“Mmm, good, baby-boy. That’s perfect. Will you show daddy? Let him see how sexy you look in the things he got for you?”

Izuku was nodding before he even thought about it. In this moment, he’d do anything Katsuki asked of him. 

Katsuki didn’t give him time to think about it. Quick as a flash, he had Izuku hoisted up on the countertop, his shorts pulled down and off. Jumper pushed back until his nipples were exposed, erect and aching under Katsuki's gaze and pheromones. On his back, staring dazedly at the ceiling fan, Izuku tried to close his legs in retrospective shyness, but Katsuki pulled them apart and got between them before he could. The alpha’s eyes were ravenous as he stared down at him. 

“You look even more delicious than I imagined.”

This time, Katsuki didn’t touch him. He just looked. So intensely it made Izuku’s skin prickle; the cold countertop to his back didn’t help. Nor did the fact that he could remember a younger Katsuki fucking him just like this in the past. 

There was a part of him that desperately wanted to spread his legs further, pull his knees up and whine at Katsuki to fuck him with his giant cock and knot until Izuku couldn’t scream past the hoarseness of his own voice. It’s all he’s been able to think about over the last few weeks.

Katsuki’s eyes were no longer looking at Izuku’s entire body. Instead, he was staring straight at Izuku’s core, where he could feel himself clenching and relaxing in turn. He wondered if Katsuki could see the slightest gape left over from the dildo after Izuku’s heat, the way he was still trickling with that weird, thick slick, even heavier now with his body heated.

Katsuki swallowed heavily. “Turn over. I need to see how the back fits you.”

“Daddy?”

“Do it, Izuku. These are going to be marketed to mated omegas. I need to make sure that the view their alphas will get is adequate.”

The sirens blaring in Izuku’s head got louder.

Despite his doubt, Izuku flipped over. Then, the wickedest idea popped into his head. 

Katsuki appeared mostly unaffected so far. By contrast, Izuku was slicking so much he was sure that it was visible. Was probably making the material stick to his pussy lips and displaying to Katsuki just how much Izuku liked being under his eyes. How much he needed something in him. 

He wanted Katsuki to feel even just one fifth of the desire Izuku felt. To know that this wasn’t one sided, even if it was just a fact of their natures that Katsuki would react to him.

So he flipped over and he bowed down into full presentation. Hips up, spine curved, head resting to the side so he could look Katsuki straight in the eye while he was bared fully to the alpha. “Like this, daddy?”

Katsuki’s eyes turned to slits. “Just like that, darling.” His voice was guttural, and Izuku wanted to nuzzle into his throat and hear it rumble from his chest from up close. He’d lie down in that voice and roll around in it if he could. 

As if he were unable to help himself, Katsuki’s fingers slid up his thighs. He pushed Izuku’s knees out further and forced him to curve his back even more. The alpha pulled at the strings of the underwear, forcing it even tighter between Izuku’s folds, until he was sure Katsuki must be able to see every detail. “These fit you so well. I’m going to have to get you more. This filthy cunt of yours is going to slick through them quickly if you’re always like this when you wear them.” His voice turned a little mocking. “Or are you going to say you’re only like this after your heat?”

“I-”

“If you’re always this messy, then as your alpha, it's my responsibility to do something about it. The best way to stop an omega leaking has always been a good knotting. What do you say, darling? I could watch you squirm on my cock. Get one of those neat kitchen countertops for needy omegas with a nook in it for you to lean over while I’m preparing our food. Let you do the only thing you’re good for and keep me warm and ready to go while I provide for us both. I think an omega with a pussy as insatiable as this needs something like that. Am I right, Izuku? You’d do that for daddy, wouldn’t you?”

Where the fuck was this coming from? That’s really not something you say to your son, daddy. 

Izuku wanted it so badly though. Just the thought of providing pleasure for his daddy while his daddy provided for them both had him slicking even more. 

Unfortunately, Izuku was quiet for too long and Katsuki seemed to catch himself. He backed off before Izuku could reply. Suddenly cold, Izuku whined at the space between them. 

When he looked back up, Katsuki was back at the stove, furiously stirring at their dinner. With him angled away, Izuku couldn’t read his expression or body language at all. “Dinner will be ready in thirty minutes. Go and relax, I’ll call you when it’s done.”

Nearly crying at the dismissal, Izuku slinked off the counter and ran to his room. 

At dinner time, Katsuki wouldn’t look Izuku in the eye. Instead, he served him his food and the usual milkshake he made for Izuku after his heats. It was full of omega proteins, designed to help omegas recover all the minerals and nutrients they lose during their heats.

Still a little frustrated, Izuku sipped at it through the thick straw, holding in his relieved sigh at the taste. It was meant to be salted caramel flavour, but Katsuki always made them so much better than Izuku could. Thick and sweet and just this side of too salty. Something almost malty on his tongue that made his entire body relax. It was perfect. 

Too engrossed in his meal, he didn't see the intense look on Katsuki’s face every time Izuku took a sip of the thick liquid. The way his hands clenched over his cutlery every time Izuku’s cheeks hollowed and his throat bobbed, a feral possessiveness in his eyes.

No, Izuku was too busy thinking about his next plan of action. 

“Daddy, can I have another milkshake after dinner?”

“Of course, baby. I’ll make it for you whenever you want.”

Chapter Text

In the days following Izuku’s heat, Katsuki takes to fussing over him. After not having had Katsuki’s full attention for days due to him spending all his free time with Ochako and her parties, Izuku flourishes under the attention like a parched plant under water. It’s euphoric and he milks it for all he’s worth. 

He gets his dad to watch movies with him and they have long debates about their favourite shows and characters. Katsuki helps catch Izuku up with his homework he’s behind on due to forgetting the bulk of his topics with his month-long interlude to the past. The milkshakes keep coming, now; Katsuki says that he needs to drink them more after an unsuppressed heat to balance all the fluids and electrolytes he lost, and Izuku guzzles them down, the salty maltiness of them getting stronger and more satisfying. Katsuki even helps massage out the tension and stress in Izuku’s heat-fatigued body, hours of time spent under his dads calloused hands while relaxing in the comfort of Katsuki's den. The fact that Katsuki’s scent gets rubbed all over him is just a happy coincidence.

Perhaps Izuku gets a bit spoiled, because when Katsuki announces that he can’t spend the next few evenings with Izuku as he’s going to spend time with Ochako, Izuku goes a little crazy. 

Not to Katsuki’s face. No, in front of Katsuki he accepts this betrayal with a wooden smile and quickly excuses himself to go scream in his pillow. 

Is Izuku not good enough for him? Is he not as exciting or is he missing something that would mean Katsuki would prefer to spend time with Ochako of all people? 

Unacceptable. 

The last time he’d gotten close to getting Katsuki to crack lingers in Izuku's memories, as it has done so for the last few days. So Izuku pulls his head out of his pillow, goes into his dressing room, and pulls out the nondescript brown box that Mitsuki sent him not so long ago. 

Inside, wrapped in Daibaku-branded tissue paper, is his magnum opus. 

Now, the thing about lingerie is that, in a lot of cases, the main focal point of the entire ensemble is the boobs. And Izuku gets it, boobs are great. He understands the draw. A great pair of tits are just… Well, they’re one of life's greatest gifts. 

To understand why he’s drawing attention to this, you have to understand that Izuku is about as close to flat-chested as it gets. They’d weirdly gotten a little bigger after his heat, but he’s got little A-cups with dusky pink areolas that he personally has learnt to like (he’s heard too much complaining from Momo about back pain to be anything but grateful to be spared). Even with a push-up bra, he gets only a little hint of cleavage. It’s whatever. 

(It should be noted that Katsuki, in Izuku’s professional (read: horny) opinion, has a great chest. Really just 10000000000/10. Would motorboat them any day.)

Anyway, the point is, Izuku does not have tits.

This would be annoying for his present goals if he didn’t know that Katsuki was about as much of an ass-and-thigh man as it is physically possible to be. And not to boast too much, but Izuku has a plump but tight ass that has the nicest bounce, with a fat pair of thighs that Katsuki rests a casual hand on far too often for it to be a coincidence.

Izuku knows this because when he was in the past, before Izuku succumbed to penetration, Katsuki used to flip him over and wank off over his ass, or between his cheeks, or while rubbing between his thighs, or just with a hand squeezing a cheek just about every single time Izuku had mildly bent over. Slapping at his ass just to watch it jiggle, or biting at his thighs until they were covered in marks. The filth that spewed out of Katsuki’s mouth at these points still, to this day, makes Izuku slick up on the spot.

So when Mitsuki had asked him what he wanted from their upcoming catalogue, Izuku had decided to weaponise this knowledge. 

With Katsuki’s recent busy schedule, the only time Izuku gets to see him consistently is in the morning when Katsuki grabs his coffee on the way out the door to work. He’ll come in, whack at the machine until it spits out some of the strongest smelling roasted bean tar known to man or god, add about half a litre of milk and a few shots of low-calorie caramel syrup until it wouldn’t cause a heart attack or numb lips on first sip, grab a bagel and a packed breakfast to eat in the car from the Chef, kiss a groggy Izuku on the forehead, snuggle up behind his back to renew his scent marks while Izuku ate, and then run out to his Land Rover because he was inevitably late. 

They had a system. One that Izuku decides to take a pick-axe to. 

Katsuki had nearly fucked him in the kitchen last time; Izuku isn’t going to just let him get away with not following through. 

That morning, Katsuki grumbles his customary greeting as he wanders into the kitchen and makes a bee-line straight to the coffee machine. As if scripted, the staff take a glance at his grumpy face, then at Izuku, and hurriedly find somewhere else to be. The dark circles under Katsuki’s eyes are even worse tonight after spending several days on ‘dates’ with Ochako. He smells and looks immaculate in his Daibaku suit and Rolex, hair swept back alluringly to display his undercut, but there’s a lethargy to him that makes Izuku’s lip curl.

Katsuki whacks a few spoonfuls of the specially-roasted, hand-ground, single-origin imported beans that Izuku knows costs an astronomical price in the machine, he swats at the buttons and growls at it when it dares to ping at him angrily for some setting he’s accidentally selected. Katsuki growls racket up as the machine continues to deny him his coffee and then he just starts hitting it until it finally gives up and gives him what he wants. 

To this day, Izuku has no idea how Katsuki has so many problems using the machine. There’s literally two buttons to press to make espressos, and yet every morning Katsuki fights it like it's personally trying to make his life miserable. He could even ask someone else to do it for him, but Katsuki refuses.

Coffee in hand, Katsuki finally quietens down and stumbles over to come bother Izuku. 

Only, he rounds the kitchen aisle and just… freezes. 

“HRRGG,” Katsuki says, eyes wide. He drops his coffee with a splash as the travel mug bounces across the tiles. He doesn’t seem to register it, even though some definitely splashed on his leg.

Fighting a victorious smile, Izuku spins around on his stool, thighs spread in a V-shape. “What’s wrong, daddy?” he asks innocently. 

He doesn’t think Katsuki even hears him. Red eyes are too busy gobbling up the lacy front of the silk chemise slip Izuku is wearing as pyjamas. It’s soft in the front, thick lace straps delicately glossing over his shoulders and gradually getting thicker into triangular cups to join low over the faint swell of his tits; eventually they attach to the short skirt at the front, which barely comes up to his midthigh, and even then is made of translucent lace. 

Izuku stands up, sashaying closer to where Katsuki is still frozen, but remains just out of reach. He can feel a cold draft on his back, but that’s not surprising. 

“Do you like it?” Izuku asks. “You did say I can wear whatever I like as long as I’m at home. The back is even nicer, do you want to see?” 

Izuku doesn’t wait for his answer. He twirls, gathering his hair in his hands and holding it up high so that Katsuki gets an uninhibited look at his unmarked neck. There’s a choked off noise from behind him and Izuku doesn’t have to hide the smile this time. There is no way Katsuki is looking at his face. 

The skirt of the slip is really more of an apron, almost: it doesn’t join together at the back, only connects together via a little bow tied at mid-spine, leaving the fabric to part just slightly either side. Edged in lace, it parts like curtains over his ass, revealing the dark orange thong Izuku is wearing underneath.

Shameless, Izuku makes sure to perk out his bottom. He’d tested poses, and he knows it makes his ass look even thicker like this. 

Katsuki keeps making cut-off noises like he’s growling, only to sound like he's asphyxiating, and then back again. Izuku can’t help himself, he’s so nervous and excited, he does a little wiggle. 

Hands slam onto his hips, stilling the motion. Izuku’s entire body shakes with anticipation. 

In this moment, Izuku is damned sure that Katsuki is thinking of no-one but him. He’s not thinking about his job, or his responsibilities, or Ochako and those thrice-cursed omegas at the clubs he’s been visiting. The only thing Katsuki is seeing, thinking, smelling, touching is Izuku. 

Izuku is sure they can add tasting in there too.

“Do you like it, daddy?” Izuku asks, but it comes out breathy. “I tried to pick something just for you.”

“Stop. Talking.” Katsuki gets a hand on Izuku’s nape and pushes, until Izuku is slowly forced to lean over the kitchen counter. His hands come out to brace against it, the marble shockingly cold under his sweating palms.

Yes. YES. he chants internally. His skin is made of static, going even fuzzier under Katsuki’s blistering hands. 

Izuku widens his stance, preparing for the onslaught. The younger Katsuki had made sure Izuku knew how to take it in this position, it was one of his favourites when they were rushed in the morning. A quick (or not) knot while they ate breakfast before school. Sometimes it had lasted long enough that Katsuki had to carry him out to the car still knotted, all while Izuku avoided eye contact with the unbothered chauffeur. Izuku is sure that the older version of Katsuki will be even more satisfying. 

Izuku has no doubts about Katsuki’s satisfaction. Izuku is the best and only omega worthy of Katsuki’s knot and come. He’s sure that no one else can even take it all, let alone stretch and lock around it like he can. He’s not going to let Katsuki run away this time.

The hand on Izuku’s hip lets go to play with the partings of the skirt, pulling it away to bare Izuku’s ass cheeks. 

“You look delicious, Izuku. But you know that, don’t you?”

Hesitantly, Izuku nods. 

“You picked this for me?”

Another nod. 

“You’re evil, baby. How can you put such ripe fruit in front of an alpha and not expect him to bite?” Katsuki's voice goes into a register that makes the fine hair on Izuku’s neck rise. “So mean to your poor old daddy. Making him look when he can’t touch.”

Izuku whines in his throat. He wants to beg Katsuki to touch him, but the alpha’s order not to talk is still in effect and he can’t get the words out.

“Or is that what you wanted? Is scenting not enough for you anymore, do you want me to touch you? Get my fingers under this little slip of a thing as I get you off right here at the breakfast table?” 

Izuku whines go higher pitched. He does want that, but it’s not all he wants. 

“No, it’s not just my fingers. I think my baby-boy wants his daddy to get him stretched out and nice and loose for his cock, hmm? Wants to be a good traditional little omega and start the day off with a tummy full of daddy’s knot and come, isn’t that right, Izuku?”

Desperate, Izuku nods. Tears nearly spilling out from how much he wants Katsuki’s hands on him. 

“Well, I suppose you are coming up to that age,” Katsuki says consideringly. He stands petting up and down Izuku’s spine soothingly, going from nape to cheek and squeezing each end. Izuku squirms each time, until Katsuki has to use one hand to keep him still. “Have I been neglecting you, darling? Not giving you the knot you’ve been needing all this time?”

Izuku nods. He’d agree to anything right now if it meant getting Katsuki’s cock in him. 

“Is that why you keep trying to leave me?” Katsuki continues, quieter this time. 

Wait, what? The part of Izuku that isn’t drunk off need tries to focus on that question and what the fuck it could mean, but the next moment there’s a finger breaching his sodden folds and he has much more important things to be focusing on. 

He mewls as the first, thick finger pushes inside his cunt, wiggling his hips to try and get it deeper with no success. Not with Katsuki’s other hand on his hip and pressing him into the cold surface of the counter. It contrasts pleasingly with the warmth of Katsuki’s front pressing into his spine, mouth hovering just over Izuku’s nape. Every breath making shivers race down his spine.

“I never knew my baby was such a greedy slut.” Katsuki chuckles. “You certainly didn’t get that from my side of the family.”

Blatant lies, but Izuku isn’t exactly in a position to say that right now. 

One finger becomes two, Izuku gasping as they slide in, just a hint more of a stretch while Katsuki’s thumb circles his clit in a way that makes his core feel molten. He should be unused to taking anything after the last few weeks, but he quickly gets back into the rhythm of it, his body conditioned to react to Katsuki’s overwhelming pheromones, and he relaxes around Katsuki’s fingers until there isn’t the slightest burn. The copious amounts of slick he’s leaking helps. If he looks below him, he’s sure he’ll see more than a few splatters on the ground. Katsuki’s hand must be covered. He feels bad for the maids that will have to clean up after them.

“That’s it, baby-boy. So tight, but you’re taking them so well. Such a greedy pussy, taking everything you’re given. First time having anything inside and you’re stretching so easy for your alpha. So good for me, aren’t you?”

The question finally unlocks his voice, and Izuku uses it to scream. “Yes! YES, daddy! Feel so good! Right there!”

“Fuck, you feel so good around my fingers. Can’t believe you’re taking them so well. Thought it would take ages to stretch out your tiny pussy enough to take my cock outside of heat, let alone my knot, but you might be able to do it first try.” Katsuki shifts his weight, pressing his heavy erection to the back of Izuku’s thigh. Even trapped behind his trousers, Izuku thinks it might be even bigger than in the past. 

He salivates. He wants it in him now. Wants to feel the heat in his core, the inexorable stretch of the knot, and the relief as his body relents and locks around it. That monster is going to make him come so hard he squirts, he just knows it. It’s happened before, after all. 

Let’s see another omega even try to touch Katsuki when he’s got Izuku’s claim on him like that. 

“Daddy, daddy, I need your cock so badly. Please. Please give it to me.”

“One more finger. Don’t want to break you too early.” A fourth finger pushes against Izuku’s rim, before slowly sliding in with the others. “Just like that.” Katsuki growls into the curve of Izuku’s neck, seems to go a little feral because he slips into his alpha voice. “Are you looking forward to your first knot, omega?”

“Not my first knot,” Izuku says before he can stop himself, unable to lie straight to his alpha like that. 

Katsuki goes very still, the fingers withdrawing with a wet squelch, and Izuku gasps.

FUCK.

“Somebody else has knotted you?”

Izuku physically can’t not respond. 

He nods. It’s technically correct; this adult Katsuki has never knotted him. 

The body plastered to Izuku’s back shakes, getting stronger until a truly hideous snarl rumbles through Katsuki’s entire body. 

The room is freezing against Izuku’s back when Katsuki rips himself away and bursts out the kitchen so powerfully that the door is knocked off its hinges. 

Left face down on the kitchen table, Izuku knocks his forehead against the counter. 

He’s fucked. 

Katsuki doesn’t stay away for long. He comes back and tells Izuku he’s grounded and to not even think about going back to school – ever. He’s officially being remotely home-schooled. Then the alpha locks himself in the study to fume, seemingly unable to look at Izuku’s face.

An overreaction, but Izuku had somewhat expected it.

Just to escape the stifling air of the house, Izuku sneaks out and runs down the drive and next door to Shouto’s house. He leaves a note for Katsuki that he’s going to Nana's, and makes sure she’s also ready to cover for him. There’s no use in making Katsuki even madder at him. 

Shouto meets him at the front door before he can even ring the bell. From deeper within the house Izuku can hear the raised voices of Todoroki Enji and Touya, and Izuku winces at how dead inside Shouto looks. 

Shouto looks Izuku up and down, and his dead look is exchanged for concern. 

“Hey, Izuku?” Shouto says slipping out of the door and twirling a set of car keys around a finger. “Do you want to go for a drive? Just… to get away from everything for a while.”

His face is flat, but his eyes are kind and a little desperate. More than anything, it’s that desperateness that makes Izuku reply. “Yes, please.”

They end up at the top of the Drop, a high hill covered in forest where there’s lots of walking spots. There’s a little clearing at the top of the Drop where everyone goes to watch the fireworks on new-year’s eve, and they end up parked on the edge of a cliff-face, watching the sunset. It’s beautiful here, the clearing is right next to the road, but far enough off that it’s surrounded by grasses and flowers, before it suddenly cuts off at the cliff. A metal fence that’s long since been eaten by the shrubbery prevents anyone going too close to the edge. 

Kids at school call it Lover’s Fall: it used to be a popular make-out spot. Izuku has to forcibly stop himself from thinking about the times Katsuki had taken him here in the past. Still, the ghost of his memories watches the sunset with him at his shoulder, a phantom kiss pressed to his cheek from behind. 

“My dad will kill you if he finds us here,” Izuku says idly, elbow on the door and chin propped on his hand. He rubs his cheek, eyes downcast as he tries to scrub away the feeling of lips on his skin.

Todoroki scoffs. “Your dad could find us together in the middle of a crowded room and he’d still probably go ape-shit.”

Izuku concedes that one to him with a hum. It’s not improbable. 

“Is your dad still giving you issues about taking over the company?” Izuku asks. 

“Ye-p.” Todoroki pops the p. “Touya is right there and enthusiastic, but no~, a beta couldn’t possibly take over. It’s bullshit. But that’s old news, what’s been going on with you?”

“Nothing.”

“Please try that with someone who hasn’t known you since you were five.”

“It’s nothing, I’m just trying to… understand some things. I guess.”

“Like what?”

Izuku sighs. “I think my dad wants to fuck me.”

“And grass is green. Tell me something I don’t know.”

Izuku looks at Shouto out of the corner of his eye. “I think I want to fuck my dad.”

A blue eye rolls. “I said something I don’t know.”

“You’re taking this all very well.”

Shouto shrugged. “He’s your alpha. It’s nature, it happens all the time.”

“Not just heats, Shouto. I mean like mates.”

“Ah.” Finally, Shouto’s mouth drops open in the shock Izuku has been expecting. In terms of the magnitude of Shouto’s microexpressions, that was basically the equivalent of a gasp and double take.

“That’s not even all of it,” Izuku says, and then he finally describes everything that had happened in the past. Once the dam has been broken, everything just gushes out all at once. 

Shouto takes it remarkably well. But then, he’s always been a bit looser with his adherence of social mores, and he’s good at rolling with the punches. Not to mention, Shouto’s alpha instincts are stronger than most, so if anyone was going to understand on that level it’s him. 

“So, in conclusion: you’re broken-hearted from leaving Katsuki in the past; are happy because you’re alive and in the right time; are confused because you’re still in love with the present Katsuki; are even more confused because your dad seems to be still carrying out those same courting steps; and are jealous because in an attempt to make him happy with someone he can actually mate, you set him up with Ochako, which means he’s spending more time away with you and with other people; so now you’re acting out to get his attention, but have accidentally revealed to your very conservative, traditionalist, possessive father—who, by the way, is probably in love with you too—that you’ve fucked and been knotted by someone else?”

“... That just about sums it up, yeah.”

“And that someone else was him but in the past?”

“Yep.”

“Yikes.”

“Tell me about it.”

A pause, and then they both burst into laughter. 

“Only you, Izuku,” Shouto says once he’s recovered.

“Believe me, this time, even I’m amazed by this clusterfuck.”

“Quick question – and I mean no offence by this, I’m genuinely curious – how do you know it’s love you feel for him? Couldn’t it just be the natural attraction of an omega for their alpha? He’s the head of your pack hierarchy and he’s always been so devoted to you, couldn’t you be getting confused?”

Izuku considers it. “I guess it’s possible. I don’t know how I could test it out though.”

“Want to kiss me and see if it feels anything similar?”

“Shouto, what the actual fuck?”

“No, I’m serious, hear me out. I’m the only person in this entire city who’s alpha is as strong as Katsuki’s, and if you were ever going to leave your family pack for another, it would be to join mine – let’s be real.” Reluctantly, Izuku nods. Deep down, he knows that this fact is the exact reason why Katsuki despises Shouto. “Try kissing and scenting me, it might show you if what you’re feeling is just an omega thing for the strongest alpha closest to you, or if it’s what you want.”

Izuku thinks about it. “I hate that you have a point.”

“You always do.”

“All right. Fuck it, let’s do this. Get over here, gimme your face.”

“Jeez, how romantic,” Shouto deadpans. 

“Shut up, this was your idea. Get over here.”

“I’m coming, I’m coming. God, you’re eager.”

“Can you just shut the fuck up and - good, yes, right. Tilt your head a little bit more.”

Eyes closed and leaning over the console with duck lips, Shouto’s face has never looked more hilarious. Izuku cannot imagine kissing him without laughing in his face. 

“Can you not leave me hanging like this? It’s so awkward and the gearstick is approaching places it shouldn’t.”

“Sorry, yes.” Izuku leans in slowly, breathing in deep to pick up Shouto’s scent to the max. It’s warm and homey, just like always. 

He rubs his cheek against Shouto, scenting him. It feels intimate and loving. His heart definitely melts a little bit. But it doesn’t race. There’s no butterflies. He just feels happy to be so close to his best friend. He’s filled with fondness. 

He's pretty sure he already has his answer.

Slowly, despite his gut protesting, he connects their lips. 

The car door is ripped open and Shouto is pulled out roughly. Izuku opens his eyes to an enraged Katsuki – fangs out and snarls ripping from his chest – slamming Shouto against the side of the car.

“Oh, shit.”

Izuku flings himself out of the car and around the hood, but he’s still too late to prevent Katsuki from sending the first punch. He winces at the heavy thud and the chorus of snarls from both Katsuki and Shouto, tussling as the younger alpha is pinned in place and unable to fight back. 

Katsuki’s arm pulls back for the second hit, so Izuku gathers up all his training in dealing with rutting alphas and tackles Katsuki before it can hit. 

Katsuki barely even wobbles. Conversely, for Izuku, it’s like running face first into a wall.

Jesus Christ, how did he forget that Katsuki is built like a brick shithouse? Izuku barely has the effect of a gnat on a hippo.

… Why does he find that kind of hot?

Katsuki would be able to pick up Izuku no problem. Throw him around as and where he liked, and there would be nothing Izuku could do to stop him. Hmm – Izuku needs to focus. 

The (attempted) tackle does switch Katsuki’s attention from Shouto to Izuku and that’s good enough. Izuku slides between them before any more punches can be thrown, feeling Shouto duck down behind him. Smart. 

Katsuki, just like Izuku thought, simply picks him up and moves him out of the way. Easy peasy. 

Yep, Izuku was right. That’s hot. 

It also gives Shouto just a split second to slide back into the car while Katsuki’s back is turned and slam the door shut. The locks click into place. Just before the door shuts, Izuku nods towards Shouto’s frantic look and he nods back. Shouto shouldn’t get caught up in this, this is Izuku’s mess to deal with. Having Shouto there would mean Katsuki would never calm down. 

The car squeals as it backs away at high velocity.

Katsuki slams his hands against the car as it peels away, chasing it until it’s going too fast to keep up, screaming, “DIE. DIE DIE DIE DIE DIE. COME BACK HERE AND DIE YOU MOTHERFUCKING POACHING PIECE OF SHIT. THIS ISN’T OVER. I’LL HUNT YOU TO THE ENDS OF THE FUCKING EARTH FOR TOUCHING WHAT’S MINE. I’LL RIP YOUR GOOD-FOR-NOTHING KNOT OFF AND SUFFOCATE YOU WITH IT.”

“Daddy, he’s gone.”

“YOU!” Katsuki whirls on him, angrier than Izuku has ever seen him. His eyes are slitted, cheeks red, and venom and spit fly from his mouth. “HOW DARE YOU! YOU - YOU-” Katsuki’s fists clench and unclench as he loses his words. He screams and kicks at the ground, muttering angrily.

“I’m not a child, I can kiss whoever I-”

“YES YOU ARE. YOU’RE MY BABY, AND YOU’RE ACTING LIKE A WHORE.  I DIDN’T RAISE YOU LIKE THIS.”

“I AM NOT A WHORE.”

“OH REALLY? SO YOU’RE NOT KISSING AND DOING GOD KNOWS WHAT WITH RANDOM ALPHAS IN THEIR CAR THE MOMENT MY BACK IS TURNED?”

“IT’S NOT WHAT IT LOOKS LIKE!”

“OH, I KNOW EXACTLY WHAT IT IS. I CAN’T BELIEVE YOU. I WOULD NEVER HAVE DONE SOMETHING LIKE THIS AT YOUR AGE.”

This.

Goddamn. 

Liar.

"FUCK YOU, DADDY. YOU WERE WORSE. YOU WERE THE ONE WHO PULLED OVER IN THIS EXACT PARKING SPACE TO EAT ME OUT IN THE BACK OF YOUR CAR. THRICE!”

They both stop dead. 

Fuck, Izuku thinks.

“Bakugou Izuku, what the fuck do you mean by that?”

“Nothing!”

“Izuku.”

Chapter Text

With the desperation that can only come from openly admitting that you may have had sex with your father 17 years in the past, Izuku does the only thing he can do.

He deflects like hell. 

“How did you even find me?” Izuku says. 

“I have a tracker on your keys, wallet, and phone,” Katsuki admits far too easily. “What did you mean by saying I was worse? When have I ever pulled over here and eaten you out in my car, let alone three times?”

“I was lying, Kacchan, obviously.” Izuku laughs unconvincingly. “Just the heat of the argument. You were saying something about Shouto and how you caught us kissing?”

Izuku’s lame attempts to redirect Katsuki’s attention do not work even slightly. Katsuki doesn’t get distracted, his expression is one of deep concentration. 

“The only person I’ve ever eaten out in my car is…” Katsuki flinches a little, and then his eyes flick to Izuku as if suddenly seeing him for the first time. “But that’s not possible.”

Izuku cringes. Like a shark, Katsuki catches the movement and smells blood. 

“Izuku, is it possible?”

Izuku doesn’t know what to do. To admit the truth, or hide it for eternity? 

“Bakugou Izuku, is it possible for you to have gone back in time?”

“Yes!” It’s torn from him and it’s like a weight is taken off his shoulders. He hates keeping things from his dad and it’s a relief to not be the only one who knows what they did.

Katsuki stumbles backwards, blood draining from his face. “That was you,” he whispers. “You’re my Izuku. Both of them.”

The world stops spinning.

Izuku feels lightheaded. His thoughts are a mess; he wants to be able to deny it and run away but he is frozen in place. He doesn’t know how Katsuki can so easily connect the dots and then accept that Izuku time-travelled, but this is it. This is what will drive Katsuki off. After all, Izuku has just admitted to going back in time and allowing his father’s younger self to have sex with him, only to then break his heart and doom him to a loveless marriage. 

Instead, “You let me fuck you. No, not just a fuck. I took your virginity-” Katsuki runs his hands through his hair, wild-eyed. “And you let me try to breed you. I bred you on every surface in my parents' house. In every nook and cranny of that school. I bred you during your heat - or, I tried to… the implant, fuck, of course it didn’t work. But you let me try. You liked it. Begged me for it, even… and you called me daddy, even back then. Got off on it; called out for your daddy when you were the most turned on. I thought it was just a kink, but…”

Izuku waits for the shame. Closes his eyes to it. 

When he opens them, Katsuki is breathing heavily, open-mouthed. His trousers are tented. 

“If you don’t want this, baby-boy, then you better start running. Fast.”

Oh.

The world starts spinning again.

Flying high on adrenaline, Izuku maintains eye contact and very slowly backs away. Step by step, he retreats. His knees knock softly into the hot metal of the bonnet of Katsuki’s car and, smirking, he jumps onto the hood. Luxuriating in Katsuki’s total captivation, he spreads his legs and leans back on his hands. 

A cheshire grin spreads slowly across Katsuki’s face. “Oh you fucking slut. It’s like that is it?”

“I’m not a slut, but it’s like that, daddy.” Izuku bites his lip and looks down with hooded eyes just to watch how it makes Katsuki’s jaw clench. “We never did manage to make it out of the backseat, way back then. Seems like a shame to me.”

“I couldn’t agree more.” Katsuki stalks towards him, slow and predatory. He licks his fangs as he shrugs off his suit jacket, completely unconcerned as it falls onto the grass. “I’m going to make you scream so loud it’ll fucking echo.”

“I’d like to see you try. I’ll warn you now, you’ve got a pretty high bar to meet, old man.”

“If I didn’t like hearing your voice so much, you’d be gagged for that, baby.”

“Oh I’m gagging for something alright.”

Katsuki pauses, lips twitching. Momentarily, his entire countenance softens as he laughs throatily. “That’s a terrible line.”

“Do you not remember the lines you used to come out with when you were younger? Your dirty talk would make a nun weep.”

“Strange, I distinctly remember you being very into it.”

“I never said I didn’t like it.” Katsuki’s close enough that Izuku can reach out and tug him closer by his shirt, so he does. Face to face, Katsuki in-between his thighs: it’s a familiar position. Izuku presses himself up Katsuki’s front, cursing Katsuki’s suit and his own shorts and crop top for getting in the way. He wants as much contact as possible; it feels like he can’t get Katsuki close enough. He’s been deprived of this for what feels like an eternity and now he’s got it back, he’s not letting it go for anything. “In fact, I distinctly remember you promising to fill me up until I never felt empty again and I think it’s about time you follow through. It has been 17 years, after all.”

Katsuki growls, slamming his hands either side of Izuku’s thighs and leaning in until there’s only a breath between them. From this close his scent engulfs Izuku: full-bodied, filling his lungs with lust and darker possession and love. It smells like home. “You know I’ll always give you anything you want, my darling.”

Eyes closing, Izuku leans in to finally get the kiss he’s desperate for but a finger on his lips stops him. When he opens his eyes, Katsuki’s face is intent. “One last question. When you said that you’ve been knotted before, was that only my younger self you were talking about?” Katsuki asks, voice suddenly menacing. His eyes are so dark Izuku can only see a hint of red. 

“Yes.”

“And when you came back home covered in scent neutralisers, was that when you came back from the past and you needed to get my scent off so I wouldn’t realise that I’d somehow slept with you?”

“Yes.”

“And all this time you’ve been acting out, it’s because you had one taste of my cock and since then your greedy little pussy has been craving it so badly that it’s been making you act irrationally.”

“Well, I wouldn’t say irrational-”

“Izuku.”

“... Fine, yes.”

“Thank fuck.” Katsuki’s mouth crashes into his. It’s fierce from the get go. Katsuki braces his hand on Izuku’s nape and he uses it to control the kiss entirely; pressing them together, never letting Izuku even retreat to breathe without his say so. Izuku’s entire face tingles with the force of his blush as Katsuki licks into his mouth with a muted growl and an insistent press of his tongue. A nibble of teeth on his lip actually makes Izuku mewl. It's wet and messy and there’s saliva on their chins but he has never gotten worked up quicker. Katsuki kisses like he’s trying to imprint his very essence on Izuku’s soul. 

Never breaking contact, Katsuki slowly lowers Izuku down onto the hood until his back is pressed to the engine-warm metal and he’s covered by the hulking alpha. Katsuki breaks the kiss. His lips are swollen and bitten red; his irises are eclipsed by black; and yet, looking down at Izuku, he softens with what can only be described as adoration. The hand that was on Izuku’s nape slides around to cup his jaw and Izuku leans into it, pressing a kiss to his wrist. Katsuki’s eyes scrunch with what almost looks like pain at the gesture.

“I’m in love with you,” Katsuki says it like it’s being ripped from his lips. “I love you so much, Izuku. I can’t even describe how much. It’s always been you. Of course it’s always been you.”

Izuku starts crying. He’s falling apart; he’s never felt so happy and complete. This is too much. How did he ever get this lucky?

“I love you too, daddy.” A sob. “So so much. Both then and now.”

A tear slides down Katsuki’s cheek and Izuku wipes it off. An echo of Izuku’s earlier movement, Katsuki leans into it, cups his other hand to Izuku’s and turns his head to press a kiss to his ring finger. “Both then and now,” Katsuki agrees. “I would’ve waited forever for you back then. And now, well, we both know I would do anything for you, baby. You've got me wrapped around your little finger.”

“Part of me wanted to stay,” Izuku admits. “A bigger part of me was desperate to come home to you.”

Izuku presses a trembling kiss to Katsuki’s lips. One, and then another. And then a longer one. Katsuki’s hand on his jaw starts stroking his cheek and the kiss quickly heats back up. 

Half-mad with need, Izuku’s legs flail as he tries to find some purchase to grind up. He locks his ankles around Katsuki’s waist and it gives him just enough to roll his hips. Grunting, Katsuki backs off. He unlocks Izuku’s legs and backs away just enough to get the space to pull off Izuku’s shoes and shorts in seconds. For a second, self-consciousness creeps up on him; he’s very aware that he’s half naked and laid out on his daddy’s car where anyone could drive past or park, while Katsuki is fully dressed and looming over him, eyes fathomless and hungry as they rake shamelessly over Izuku’s exposed body. But then the next second Katsuki’s back, hand stroking over the damp crotch of his sheer silk lace panties, right over the top of his slit, and all thoughts fly out of Izuku’s head. 

“You’re going to drive me mad, baby. I thought I told you that you’re only allowed to wear those at home, not on dates.”

“Are you really going to complain right now?”

Katsuki opens his mouth to reply but Izuku gets his hands on his belt and that seems to distract him enough. When Izuku shimmies down his trousers and boxers he’s met with the familiar sight of Katsuki’s fat cock and heavy balls, thick and gloriously intimidating. It pulses eagerly in his hand, pearls of precum already dripping from the head; the smell of it makes his mouth water. “Oh, I’ve missed you so much,” Izuku says. Pausing, he tilts his head. “You’ve grown.”

“Stop talking to my dick, it’s weird.”

“Excuse me, we were having a moment.”

“Have it later. I’m going to show you exactly how big he is – I mean, I am- fuck.”

This is fun and all, but Izuku’s getting impatient. Heedless of how public they are, he pulls his shirt off, exposing his silk bra underneath, strappy, delicate and matching his panties. He spreads his legs and Katsuki audibly swallows. 

“I want you to fuck me, daddy,” Izuku demands.

Shuddering at the term of address, Katsuki leans his elbows on the hood, pressing fluttering kisses from Izuku’s neck, down to the cleft of his tits, down his abdomen and tummy, until he reaches the edge of his underwear. “I raised you to ask for things more politely than that, baby.”

Izuku’s hands have nothing to grip on the car, so one lands on Katsuki’s shoulder and the other winds into the spikes of his hair. It does absolutely nothing to ground him against his anticipation. “Please fuck me, daddy!”

“That’s more like it.” Katsuki slides the silk of his panties to the side, face so close to his pussy that Izuku can feel his breaths. “Hello beautiful, I’ve missed you.”

“Stop talking to my pussy, it’s weir- ahhh!” 

Katsuki pulls away from where he’d been sucking his clit. “What were you saying?”

“Please, more! Just like that, daddy!”

“That’s what I thought.”

Katsuki eats Izuku out so skillfully that, overwhelmed when fingers are introduced, Izuku scrambles to get his hands on something to hold and pull on that isn’t Katsuki’s hair. The only thing he finds is the raised edge of the window wiper on the car window. When Katsuki crooks his fingers just so with the lightest nibble on his clit, Izuku clenches so hard with his entire body that he accidentally snaps it clean off. 

“... Did you just break my Bentley?”

Izuku throws the widow wiper as far as possible. “No.”

He gets a spank right to his clit for the bold-faced lie. Once, twice, thrice. Izuku shrieks as he squirts through an orgasm and it echoes a little. Katsuki looks unbearably smug with cum running down his chin.

“I think someone liked that a bit more than expected.” 

Izuku would have snarked back, but Katsuki gets three fingers back in him and suddenly it’s not as important. So much pleasure on the back of an orgasm has his thighs twitching uncontrollably. 

“You always have liked having something in your cunt.” Katsuki’s fingers hit deep and curl. Izuku gurgles. “But then, I guess that’s my fault for raising you into such a cock-hungry whore. I should take responsibility and keep you full of cock and come.”

Izuku nods vigorously. “Yes, yes! Please!”

“You’d like that, would you? Sat on my cock whenever I wanted you, keeping me warm until the next time I needed to empty my balls. A traditional little cocksleeve of an omega, only good for keeping their alpha happy and sated, too full of cum to think straight. You’ve always been a disaster in domestic work, so it’s good that I can afford a chef and maids; it gives you more time to do your real job and keep this hungry cunt ready for me, locked to my shape, tits leaking even outside of heat and without pups.”

Izuku should be denying it furiously, but Katsuki pulls his fingers out, leaving an aching emptiness that forces a whine from his throat. His entire body jerks as Katsuki pops the head of his cock in, quickly followed by a good few inches more, cleaving through Izuku’s hot insides with a groan. Izuku had forgotten this feeling of being held down and forced to take it, only able to leak around the burn. Now he’s got it back he doesn’t understand how he’s lived without it for so long.

“Yes, I’ll be so good for you.” Izuku throws his head back and Katsuki is quick to latch on to his throat. Presses bruising kisses to try and distract from the feeling of being spread so wide in his very core. “Anything for you, daddy.”

“That’s right. Just for me. You’re mine, aren’t you, baby? The only person you’d let do this is me. Not that alpha next door or any of the other multitudes of unworthy knot-heads at school, you’re mine.”

“Yes, I’m only daddy’s. I’ve only ever been daddy’s!”

“That’s right, baby, you’re daddy’s little slut.”

Izuku moans and burbles vaguely protesting gibberish as Katsuki grinds in with short rolls of his hips, slowly working into the tight confines of his cunt. Each additional inch of cock steals more and more of Izuku’s brain cells until he’s more fucked-out mess than human. 

With a curse, Katsuki pulls back, petting Izuku’s sides as he protests. “Turn around for me darling, it’ll be a better angle I promise. I’ll be able to get deeper. You always take me better from the back.”

How does Katsuki remember that when, for him, it's been over a decade since they've done this? Something there throws a red flag up, but Izuku can’t muster the coherency to think it through.

He whines, but he does as he’s told. Shakily and with much help from Katsuki, he manages to get on his feet, grass between his curling toes as he props his forearms on the hood. He genuinely starts to wonder if someone designed this car with the thought of people fucking on it, because it’s the perfect height for him to bend over into a facsimile of presentation. 

Katsuki doesn’t waste any time. Hands on Izuku’s hips to steady him, he thrusts back in until Izuku is keening. Katsuki was right. This time, he manages to bottom out with a grunt and a broad lick up the back of Izuku’s nape, covering his inflamed scent gland with claiming pheromones. It feels like he gets impossibly deep in this position, taking up all the room and then some inside Izuku.

The feel of Katsuki's shirt and trousers on Izuku's back and thighs just reminds him of how Katsuki is nearly fully dressed while Izuku is basically naked and displayed underneath him to anyone who may come to watch the sunset. It's a simple type of domination, but Izuku can't stop thinking about it. He's got a feeling it's going to be a common occurrence in the future.

“You’re mine, baby. I’m never letting you go. Even if you run, I’ll just hunt you down and chain you to my bed. Keep you in my den, locked away so no one but me can ever see you, cunt plugged and dripping with my come, round with pups and unable to escape until you forget why you ever wanted to.”

Underneath him, Izuku pants with exertion, sweaty forehead resting on the hood. The threat both chills and excites something in him. And yet, he still wants this dangerous alpha desperately.

He sobs when Katsuki starts moving. Small grinds of his hips lead up to a heavy pistoning; each thrust carving him out and filling him in the same breath. Katsuki pants, “Mine. Mine. Mine,” into the nook behind his ear and it makes Izuku tingle. 

In the corner of Izuku’s mind is a little locked box he’d promised himself never to open. But memories don’t actually work like that and, in a eureka moment, he remembers something very special he’d learnt in the past and told himself to forget. 

Katsuki has a praise kink. 

His throat is so dry that it takes a couple of swallows to wet his throat enough to be able to make more than raspy groans. “Feels so good, daddy.” Izuku doesn’t usually speak during sex – Katsuki does enough of it for both of them – but he tries his hardest to be sexy. “Fucking me so good, I can feel you in my tummy.”

“Yeah?” Katsuki sounds wrecked. “I can feel me in your tummy too.” His hand slides to feel over the definite bump of his cock just under Izuku’s tummy button. Izuku covers Katsuki’s hand with his own, pressing it down tighter and making them both groan. “Does that feel good, baby?”

“So fucking good. Reaching so deep, spreading me so wide. You’re too big daddy – can’t think about anything but your cock breeding me so well that I’m gonna leak come for days. Everyone will be able to smell it on me and– and know I belong to you.” He loses focus a bit when Katsuki gasps and his pace picks up impossibly faster, his entire body jolting with the force of Katsuki’s thrusts, balls slapping against his clit until it verges on too much. “Y-your cock – ah! – used to make me – uh! – gape in the past, but I don’t- don’t think I’m ever going to recover from this. I think you’ve b-broken me. You’ll just – ah! – be able to slide right in whenever you want.”

“My perfect omega, cunt locked to my shape.”

“My most amazing alpha, filling me like no one else ever could. You’re so – ahh! – fucking hot, daddy. Makes my pussy wet whenever I see you. So – fuck – amazing and strong, providing everything I need and want. Spoiling me rotten. Fuck, I love you. I love you. I’ve always loved you the most-” 

Katsuki shudders, pace breaking as his breaths grow ragged. “Stop. I can't-”

“Break me on your knot – please daddy, I want it so bad – want to feel the stretch as you're tied to me. I need your come locked deep inside me. Want to feel you inside, want you to breed my pussy till everyone knows that the most perfect daddy is mine.”

“Yes, I’m yours. All yours baby. Your alpha, your daddy, your everything -” Katsuki’s knot flares so fast that it makes Izuku scream, eyes rolling into the back of his head as Katsuki fucks it into him with a filthy slurping sound, a practiced hand flying to Izuku’s nape to scruff him limp and force him to take every mind-destroying inch. The alpha grunts and growls as he comes, more noisy than Izuku’s ever heard as he devolves into something feral, near howling with triumph when Izuku squirts on his cock.

In the sweat soaked aftermath, locked together, Katsuki bends Izuku's leg close to his chest and twists him around on his knot so that they're face to face. The sunset has evolved into a glorious vista of golden light and pink-purple clouds that reflect off Katsuki’s hair like a halo, contrasting deeply with the fucked-out look of dark satisfaction on his face as he watches the light glimmer off Izuku’s sweat and cum-soaked form. For his part, Izuku lies back on the bonnet, wiped out, and allows Katsuki to do what he wants as he tries to remember how to move his own body. 

Katsuki takes full advantage of this. He spreads Izuku's pussy lips with his thumbs, eyes dilated as he gently strokes where his slit is stretched taut around the base of his cock. "You're beautiful, baby. Made perfectly just for me. If I was even a little bit bigger I don't think you'd be able to take me. Well, not so easily anyway. I would find a way."

What part of this is easy? Izuku thinks. Katsuki's cock breaks him every time. His daddy is just lucky that Izuku is into that.

Katsuki pecks a panting Izuku on the nose, wiping the drool softly off his chin and then licking into his mouth once again, laughing when he rubs against Izuku's nipples and he jerks, groaning when it jostles the knot.

"Daddy, I'm tired."

"Not too tired, I hope, not with all the things I want to do to you," Katsuki says with a smirk. "But that's alright, daddy's got a plan."

Katsuki picks him up and carries him to the front seat to wait out the knot in comfort. Then, when it deflates completely, Izuku tries to pry himself off, but Katsuki tuts and holds him down. 

"Nu-uh. You’re not going to drip perfectly good cum on my leather seats. You're going to keep me warm."

"But the pedals-"

"But nothing, you don’t even come up to my chin and it’s a short drive. Just sit pretty for me."

Katsuki drives slowly and carefully, thankfully not passing anyone on the way. But Izuku thinks he takes great care to drive over every single pothole and speed bump on the way there, and he’s treated to the sensation of Katsuki getting harder inside him every time they’re jostled. 

“Whoops,” Katsuki says after a particularly hard bump, poorly suppressed humour and lust in his voice as it makes Izuku bounce in his lap. 

Hidden in his dad’s neck, Izuku rolls his eyes. 

By the time they're home, Katsuki’s cock is all the way back to hard and he doesn't wait any longer than that. He fucks Izuku on the porch, heedless of the way the curtains twitch as the maids peep out to see where the noise is coming from.

And then he fucks him on the stairs. 

And then on the landing. Twice. 

And then against the bedroom door. 

By the time they actually make it to the bed, Izuku is out cold as soon as his head hits the pillow. 

(The last thing he remembers: “Baby, please, not yet. Please, I’ve been waiting for this for so long. Let me keep going.”

“... You can keep going, daddy.”)

Katsuki fucks him on the bed. Thrice.

So sue him, he’s been a little pent up.

Izuku wakes up alone, luxuriating in the feel of his well used body.

When he shifts, he realises there's something inside him. His fingers travel down and encounter the base of what can only be a plug. Katsuki must have put it in him before leaving the bed.

It's so presumptuous and assholish, but Izuku finds it so hot he starts playing with it anyway. His tummy is tight and round, like he’d only ever seen it after his heat in the past. It should be uncomfortable, but Izuku likes it too much for it to bother him.

Daddy bred me well. 

He leans up on his elbows to find Katsuki watching him from the door, a tray of breakfast in his hands. He’s only wearing a short, lazily tied white robe with the sleeves rolled up, which should be illegal: Izuku is too young to be having heart problems like this. 

Well, Izuku can repay the favour. 

He spreads his legs, showing off his plugged cunt and swollen belly. That’s all it takes. 

Later, locked on Katsuki’s pulsing knot, the alpha feeds him his breakfast by hand. He carefully places broken off pieces of pancake and fruit on Izuku’s tongue, fingers lingering, licking any stray droplets of syrup off his lips and chin, or just licking into Izuku’s mouth for the hell of it as he comes inside Izuku again and again. Not a lot of food actually gets eaten, but it’s the happiest Izuku’s ever been. It’s all he’s ever wanted. 

And he will never let anyone or anything take it from him.

Chapter Text

“Bakugou Katsuki, what the fuck are these?” A thick packet of papers are thrown down in front of him, scattering across the glass coffee table and narrowly missing tipping over his mug. 

Katsuki had been contently sipping tea in the conservatory, half his thoughts centering around how Izuku had looked with his come running down his thighs earlier that day after he serviced Katsuki in this very room. Kneeling docilely, head on Katsuki's thigh and cock heavy in his throat while the alpha completed some work, spit and precum running down his chin messily, only getting messier when Katsuki had enough and got a hand in his curls, pushing him down deeper until he choked. Fucking him back and forth to the sounds of Izuku's wet inhales and needy whines. When he'd gotten close to knotting, Katsuki very generously gave Izuku the choice of mouth or cunt, already knowing the answer. Izuku had shakily sat himself on Katsuki's lap, back curved as he took his cock, riding him until they locked together. The fact that the maids had been around hadn’t even made him hesitate. 

It was something Izuku had started doing after he came home from school. He said it helped his focus with his homework to do it in his daddy’s lap and it was hardly something Katsuki was going to discourage. He hadn’t been conditioning Izuku for years to seek out Katsuki for comfort and for every minor issue for nothing. And now that he didn't need to hold himself back, he could finally stop taking on so many projects as an excuse to stay out of the house and instead delegate them to his department heads, giving him much more time to spoil his baby.

That contentment had abruptly ended when Ochako stormed in, fuming. Katsuki dearly regrets letting her keep her own key, he should’ve taken it away from her years ago. 

He glances at the papers on the coffee table disinterestedly. “You went through my office,” he accuses. He’d be more pissed if this had happened even a week ago, but his plans had progressed faster than expected, so this was fine. Still annoying though.

“Why do you have signed divorce papers on your desk, Katsuki?”

“I really do think it should be obvious, no?”

Her fists clench. “Why now? After all these years.”

Her anger is delicious. He’s almost glad she snooped so that he gets to see this reaction, instead of his lawyer serving them to her where Katsuki can’t watch. 

“Just felt like it was time.” He shrugs just to see her jaw flex with withheld fury. “Izuku’s no longer a child, it won’t affect him so much.”

“So it’s all because of your precious Izuku. What, did you finally get sick of pretending you don’t want to fuck him? Do you think getting rid of me will remove some sort of obstacle to your sick obsession with your own son?”

So she had known and she had still left Izuku with him alone in this house for years. 

Katsuki would be the first to admit he isn’t a good man, though he tries to be for his precious son, and he's honestly surprised that he lasted this long before claiming Izuku. If he were any less of an alpha, he would've had Izuku chained to his bed, forcing him to take his cock and knot years ago. He'd long thought that Ochako suspected this, but she'd still left them together anyway. Even if her lack of interest had been to Katsuki's benefit, and even if he may have encouraged it by making sure she knew she wasn't welcome in his territory or near his child, she deserves everything he’s got coming for her and more. 

“Not really, you’ve just lost your usefulness,” he says.

“My usefulness.”

“Mmm… you know, I’ve gotten plenty of evidence over the last few weeks of your rampant infidelity, recreational drug use, and excessive drinking. Enough that any court will not only pass a divorce with no issue, they’ll let me have full custody.” He relishes how her eyes widen with every word.

Izuku may have asked him to attend those parties in some wholly flawed and self-sacrificing attempt to make him happy, which was – in retrospect – adorable, but Katsuki had his own reasons for attending. His private investigator had been having issues getting into the exclusive events to get evidence so Katsuki had been forced to pick up the slack himself. It had meant a repulsive few weeks of suffering a multitude of rank betas and sly-eyed omegas in his space as he pretended to enjoy himself, sacrificing his precious time with Izuku, but it had been worth it for this moment. 

Also worth it for the reaction of his darling when he was deprived of Katsuki’s attention for any amount of time. Katsuki hadn’t known Izuku was the type to get jealous before this and it was delicious watching his baby acting out for his attention. Some of Izuku’s actions were misguided – the alpha next door was lucky to still be alive – but the overall result more than made up for any infractions.

Ochako starts to pace, heels clicking on the wooden floors, and Katsuki wishes he had some good whiskey instead of tea to sip as he enjoyed watching her fall apart. Perhaps it was cruel but this was a long time coming. Although she gave him the greatest gift of his life, he will never forgive her treatment of both him and Izuku. 

Nor would he ever accept the very real claim she has over Izuku as his mother. A claim that threatens his own.

“You won’t get full custody. Not even then,” Ochako says.

“I definitely will.”

“No, his true alpha will get custody.” Whatever she sees on his face makes her start to laugh hysterically. Cackling loud and proud. “That’s right, he’s not even yours! His sire is Midoriya Inko and the DNA tests will prove it.” She stopped laughing abruptly. “You take away my life and I’ll take away yours. I suggest you forget any notion of divorcing me. In fact, I think you should start thinking about doubling, no—tripling my allowance.”

Calmly, Katsuki leans forwards, picks up his mug, and takes a sip. 

Ah, perfect temperature. 

“Do you think knowing he’s not mine–” Katsuki’s hackles raise at his own phrasing and he corrects himself– “not my blood will stop me from divorcing you? You stupid bitch, do you really think I didn’t know? He looks nothing like anyone in my family.”

Ochako looks like she’s been slapped, shocked her trump card hadn’t worked. “You knew? And you didn’t say anything?”

“Of course I didn’t. If it was revealed he wasn’t of my blood that early, then we’d have gotten divorced and you’d be able to do what you’re threatening now, only a lot more successfully. I wasn’t going to let you take my child away from me.”

“I can still take him away from you. His rightful sire has the greater claim. I have the greater claim.”

Katsuki’s eyes flash. “He’s mine. I raised him. You and your pathetic little teenage lover have no claim to him. I’m his rightful sire, blood or not.”

“But now he’s all grown up, you want more than that? You disgusting freak.”

“What’s disgusting about it? Any alpha will tell you the same thing – that I’m a goddamn saint for not fucking an omega unrelated to me by blood when he’s been living and having heats in my goddamn territory for years. Betas are always trying to control the wilder dynamics, but the law and a court of my peers will be on my side. Alphas and omegas are paired for a reason. Any other alpha would have snapped him up already.”

“Then why now? Why wait until now to divorce me, when I’ll still take him away… Oh my god, you’ve been waiting until he's old enough to mate, haven’t you?”

Katsuki smiles meanly. “He’s unrelated to me by blood, he presented over two years ago, he’s past the age of consent, and now he will agree to being mine. I can claim him in the eyes of the law with no repercussions. I can marry him publicly. Hell, I can fuck a baby in him if I want to and be praised as a hero for being such a good alpha, holding off for so long with such a tempting omega in my household for years.”

It was that last item of the list – Izuku’s approval of their relationship – that had been the thing Katsuki had planned for taking the longest to obtain. Truthfully, even Katsuki has been surprised by how quickly things have progressed in terms of their sexual relationship. Especially, after the panic of having Izuku come home to him devoid of his scent-marks and refusing to answer where and with who he'd been, keeping secrets from Katsuki when he'd never done so before. Katsuki had gone a little insane, full of dread and thinking Izuku was trying to leave him for another alpha. It had made Katsuki a little... unrestrained in his behaviour. A little too impatient to make Izuku fully his.

But, luckily for him, Izuku's time in the past had made him so deliciously receptive to Katsuki's slightly reckless behaviour. Before he’d learnt about Izuku’s trip to the past, the sudden responsiveness to Katsuki’s presence and heightened awareness of his actions had befuddled Katsuki. He hadn’t anticipated them getting to where they are now for several more months, he’d thought he’d have to ease Izuku into it, get him unconsciously addicted to what only Katsuki could give him, but he wasn’t going to look a gift-horse in the mouth. 

Learning that Izuku’s virginity was already taken – even by a younger version of himself, and even though the memories of the occasion were imprinted into his psyche – had been a tough blow to take, but worth it for the accelerated outcome of a cock-desperate Izuku who couldn’t go a day without Katsuki coming in him. 

“You won’t get jack-shit if his sire forbids it,” Ochako says, effectively killing the half-chub Katsuki had been beginning to develop and bringing him back down to earth.  

“Ha! I know for a fact that your pathetic little love-affair with Midoriya Inko ended as soon as you refused to marry her and went after me at that party instead. She doesn’t know that she’s Izuku’s sire either.”

Katsuki has checked this very thoroughly. Midoriya Inko and him run in the same circles, and it had been her who had drunkenly confessed about her and Ochako’s secret love story back in high-school. Teenage lovers and a whirlwind romance that ended with a rejected proposal and devastation when Ochako had very quickly moved on to the next target. An affair Midoriya has long gotten over and had been very open in reminiscing to Katsuki about, even if she still seems somewhat confused and sad over its sudden end. Katsuki had put two and two together. 

He had also made sure that Izuku had always been conveniently staying at Mitsuki’s whenever Inko and her mate needed to come visit their home. He couldn’t risk her seeing their similarities. 

Ochako’s eyes widen, seemingly shocked by the amount of information Katsuki has. Then they narrow. “She will. I’m going to tell her and she’ll take him away and slap you with every restraining order on hand. She’s nearly as influential as you are. You’ll never see your precious baby again.”

Katsuki nearly kills her. He’s honestly amazed when he opens his eyes and she’s not lying in a puddle of her own blood, throat ripped out and crushed in his palm. 

The only thing holding him back is the knowledge that he can’t claim Izuku if he’s in prison for murder. Probably. He’s got more than enough money and influence that he’s sure he could get it passed off as a case of an alpha succumbing to their instincts when their pack is threatened and not get sentenced. But that’s a lot of hassle when he could be using that time to fuck his son into every mattress and hard surface he owns. 

He’s waited too many years to mess this up now, when he’s so close to getting everything he wants. 

He stands and stalks forward, forcing Ochako to step back until she thumps into the wall behind her. “Try it, bitch. You won’t like what happens. Not to you, nor to that poor excuse of an alpha. Just because you were willing to give up on love for an easier future doesn't mean I am. I will have Izuku, even if I have to burn down your entire world.”

“This isn't love, it's obsession. You’re fucked up, Katsuki.”

“On the contrary, there is no one else who loves Izuku as much and as purely as I do, and there never will be.”

“You’re deluded.”

“And if you know what’s good for you, you’re going to sign those papers, get out of this house and never come back.”

“Have you told him? Does he know you’re not his true sire?”

Katsuki’s fists clench. “I am his true -”

“Does he know that his real name should be Midoriya Izuku?”

“No.”

She signs the papers, hand shaking. “He will. I already messaged him about it.”

It truly is a miracle that she’s going to leave alive. Depending on Izuku’s reaction to this news, maybe Katsuki will have to correct that in the future. “So be it.”

Long after Ochako has left, Katsuki finally moves to the lounge. He sits calmly, sipping his whiskey (he’d needed something stronger) as he listens to the birds and watches the sun set. The maid comes in to set up the fire as the air chills and he waves her away once she’s done. Under his calm veneer, his hands shake with residual rage. The alpha is a storm of wild emotion, hissing like a cornered animal. 

In truth, he has no idea how Izuku will react to this news. He’d always wanted it to be him who revealed it to Izuku once they were more settled into their relationship; not over text from his harpy of a blood-mother. Compared with revealing that he wanted to mate his son, surely revealing that they weren’t actually related should be easy and a relief. It means their relationship can be openly celebrated. 

Strangely, there’s a part of Katsuki that hates it. Like some sort of link to Izuku has been stolen from him. Most of the time it’s soothed by knowing that he’ll be able to flaunt that his precious and perfect Izuku is his mate. The rest of the time though, it raises his hackles like nothing else. 

It’s Izuku’s reaction he’s worried about. Not that he’ll leave him romantically because of it (Katsuki won't let him), but that he’ll want to get to know his true blood-related sire. Family is important to Izuku, what if he leaves and joins another pack in order to learn more about this extra, unneeded sire? Even just for a little bit. What if Izuku prefers the pretender? What if Katsuki is no longer his chosen daddy, or even his chosen alpha? What if he has to share? 

Just the thought makes Katsuki feel a little murderous upset. Katsuki doesn’t want to, and isn’t going to, share Izuku with anyone. The fact that Mitsuki has as much of a claim on him as she does is bad enough. 

He hears keys in the lock on the front door. The door opens and closes as Izuku comes home after visiting Mitsuki. 

“Kacchan?” he calls. 

It’s already begun. His darling child is already not calling him daddy, even after all the work Katsuki has put in to make sure that the treasured title remains his. Katsuki feels his heart start to shred itself to pieces, letting the dark possessive void at the core of it free piece by piece. His world wavers, something red and hazy encroaches on his vision.

Katsuki has spent years manipulating every situation into driving Izuku towards him, taking the slow way to ensure that their union was of Izuku's choice, even if heavily influenced in ways that the omega will never know the full scope of. If Izuku rejects him now, Katsuki knows he'll fall apart. He can't lose Izuku: not again. It's what he's been trying to avoid from the very start. Even just the thought of it makes panic claw up his throat. 

Izuku walks through the house and freezes when he sees Katsuki sitting like a statue in the armchair in front of the fireplace, whiskey in hand. The flickering light casts eerie moving shadows across the room. Neither one of them moves, measuring each other up as they try to guess at each other's reactions. 

“She told you?” Katsuki asks just to be sure.

Izuku’s steps are silent as he pads bare-foot across the plush carpet to stand on the rug in front of the fireplace. He blocks Katsuki’s view of the fire but that’s hardly important. “Was she telling the truth?”

“Depends on what she told you.” 

His baby looks so solemn, as if he can see the turmoil writhing inside Katsuki. He probably can. In many ways, when not blinded by his lack of self-confidence, Izuku can always guess Katsuki’s emotions better than Katsuki can guess Izuku’s. 

But, at heart, Izuku has always been a little shit. 

He looks at Katsuki, presumably sees how he’s a hair's breadth from going feral with alpha possessiveness, and decides he will not be handling him with care and sensitivity. “So it’s true. You're not actually my daddy. You have no claim over me.”

Katsuki has him pinned on his back on the rug before he can blink. The fire is warm to their left, far enough away to be safe, but close enough to illuminate Izuku’s victorious face with light and shadows until he looks more creature than boy. The omega’s wrists are clutched in one of Katsuki’s hands as he holds them above a squirming Izuku’s head and forces his body heavily over top of him and between his spread thighs. It’s a direct reflection of how he held Izuku down and fucked him during his heat a few weeks ago and his cock twitches, eager to join the events unfolding and show his baby his rightful place. 

“You think that deadbeat alpha would have stuck around for that gold-digger you call a mother when a scandal like that would have ruined her career? No way, she would have run for the hills and you'd have grown up alphaless. Desperate for someone to take care of you the way you need. The universe made you for me, baby; I would have found you, taken one look, and known you were mine. I'd have ripped the head off anyone who tried to step into that role. My role. So, no, no matter what happened, it would have always ended up like this. I would have always been your daddy, one way or another. I will always have the greatest claim over you.”

“She’ll take me away,” Izuku says, the veneer of cocky smugness melting away to reveal the all-encompassing fear underneath. “I don’t want her, or anyone else. I want you. You’re my daddy, my alpha, and my sire. It will only ever be you.”

The confirmation soothes the wounded beast in Katsuki’s chest. “I know, darling. I won’t let her take you away.”

“How?”

Katsuki lets Izuku’s wrists go, pleased when the omega keeps them above his head anyway. He traces the thudding pulse of Izuku’s unmarked neck and circles his scent gland with a finger. The fire crackles and pops, one ignition inciting another. “Well, usually, when an unmated omega as beautiful, wonderful, and clever as you wanders into an alphas territory, there’s only one outcome.”

Izuku’s eyes spark with understanding, the fear gradually receding now that he knows Katsuki has it all sorted, as always. “Only three compliments? If you’re trying to seduce me you’ll have to try harder.”

Katsuki bites Izuku’s ear in reprimand, laughing when it only makes the omega’s hips roll against his. His baby is so sensitive. The laugh is short lived; Izuku smells delicious and as always it knocks Katsuki sideways with want. “How about breedable?” he breathes into Izuku’s ear. “Claimable? Fuckable? Breakable?”

Izuku throws his head back and moans, arching his neck in an invitation too sweet to resist. Katsuki latches onto the inflamed swell of his scent gland, already surrounded by dark marks, and lavishes attention. He introduces a little bit of teeth, grinning as it makes Izuku’s thighs squeeze around Katsuki’s waist. He’s fully hard and he knows Izuku can feel it as he rolls their hips together. 

“Daddy, fuck me. Please.”

“If I fuck you, my darling, I’m not going to hold back anymore. I thought we’d have more time. Once the divorce was finalised, I was going to take you somewhere where I could have you to myself for days on end when I finally gave you my bite, but this is forcing me to speed up my plans a little. I’m not going to be able to spoil you like I wanted.”

“I don’t fucking care,” Izuku snaps. He fumbles with Katsuki’s belt, rips it off and pushes down his trousers to get at his cock. Katsuki sighs with relief as he’s freed, jerking as Izuku’s dainty little hands slide over him, already slick with precum. “I would’ve let your younger self bite me in the middle of a classroom months ago. I probably would’ve let you do it before that even. I just want you.”

“You’ll always have me.”

Katsukis soul vacates his body and it leaves only the beast behind. He rips Izuku’s leggings out of the way and fucks his cock in one single stroke, making Izuku shriek and scratch a line of welts down Katsuki’s sides. The pain just elevates the pleasure. 

His skin feels too tight for his body. They’d had sex just a few hours before and Izuku is still wet, a little sloppy, and just tight enough around his cock to make the slide heavenly, even though he has a little bit of a semi-permanent gape going on with the constant knottings he’s been subject to. It makes Katsuki preen with alpha-smugness every time he sees it. 

He’s savage as he fucks into Izuku’s body and doesn't give him time to adjust. Trusting the omega to be good for him and just take it as and how Katsuki gives it to him. Like the perfect omega he is, Izuku does; his mouth falls open on a silent scream, face screwed up and tears gushing from his eyes as he’s subjected to Katsuki at his most animalistic, but the way his cunt locks up and sprays on Katsuki tells the alpha everything he needs to know. 

The omega is wet with more than just slick. Old and new come froths around his cock with every thrust, slick joining it in a pheromone-laden cocktail that has Katsuki’s fangs dropping in seconds. 

He wonders if he’ll ever get over how glorious it feels to fuck Izuku. He doubts it.

He slaps Izuku's thigh, knowing the exact force that makes the omega tighten on his cock. "Make daddy proud and keep your hips up for me, baby." When Izuku isn’t able to manage it, laying limp and pliant beneath him, Katsuki hauls his hips up himself, spreading his knees and setting Izuku’s thighs over them so the omega is draped across his lap. He uses his grip on Izuku’s hips to fuck him up and down his cock like a fleshlight. Watches the little bump of his cock under Izuku’s tummy button and loses his head in the knowledge that every time he bottoms out, the head of his cock kisses up against Izuku’s cervix. He can feel it, and he can tell Izuku does too because his breath hitches each time. When he knots, his cock is forced up against that tiny little nub deep inside Izuku, his come directly filling the omegas womb until it bloats under everything Katsuki has to give; it always gives Katsuki a little kick of alphan pride when he sees how thoroughly he fills his omega, until it's all he can do to add more.

Katsuki pulls back and the head of his cock slips from the tight clutch of Izuku’s cunt with a wet slurp, a string of slick connecting them still that quickly breaks. Izuku whines at the sudden loss, confused as he blinks up at Katsuki with wet eyes. 

“Whose pussy is this?” Katsuki smacks his wet cock against Izuku’s swollen folds for emphasis.

“Yours,” Izuku says with no hesitation. 

“Whose?”

“It’s daddy’s pussy.” 

“Good boy.” Katsuki had made sure that sentiment was indelibly worked into the part of Izuku’s brain controlled by his omega during his heat; the proof that it worked still pleases Katsuki immensely and he kisses Izuku in reward. Lips tingling and neglected cock starting to throb insistently, he pulls just an inch away so he gets to see Izuku chasing his lips. The omega whines when he pulls away further. 

“Hush, daddy wants to admire his pretty pussy before it gets too ruined.”

Ignoring his own arousal for now, he dips his thumbs into Izuku’s pulsing slit and pulls it apart like two sides of a peach, breath catching in his chest when semen instantly bubbles up; white and frothy and even more plentiful than the copious amounts of slick Izuku is leaking, soaking the cute curls of hair surrounding his sex. 

Pleased, Katsuki sinks back in deep with a growl and endeavours to fuck some more come in, until it gushes from his son in an undeniable mark of Katsuki’s claim. Katsuki had been the first to own this pussy, and he’d kill to make sure he was the last and only. 

Some time in the future, if Izuku’s ever ready for them, he’s going to breed his little omega so well. 

Or maybe not. Katsuki’s feelings on the matter flip-flop erratically. As much as it appeals to some base part of himself to imagine Izuku round and fat with his seed, he’s not sure he wants some little brats stealing Izuku’s attention, not even if they’re Katsuki’s brats. Knowing his luck they’d be just like him and would demand all of Izuku’s time and attention. Katsuki wouldn’t like that. More importantly, he doesn’t think that Izuku would like not being Katsuki’s only baby.

But that’s a future issue. Right now, he’s got more important things to focus on. Like making sure his son can’t walk for the next few days without a limp. 

“You’re mine, Bakugou Izuku. I’m never going to let you or anyone else forget that. You’ve been mine since before you were born.”

He slows down his thrusts, grinding in precise angles against where he knows Izuku’s g-spot is, leaning down until he can hear every little hitch of Izuku’s breath as he writhes on his cock, tears leaking so prettily down his cheeks, making dark eyes sparkle in the firelight and undoing Katsuki in his entirety as they stare directly into his soul. Katsuki loves him so much. His gorgeous little baby, so perfect and lovely; so sublime in his defilement.

“You’re mine and I’m yours,” Katsuki whispers, he wonders if Izuku is beyond comprehending words at this point. It’s a possibility. Izuku’s arms wrap around Katsuki’s shoulders, one hand in his hair and the other cuddling him close as they approach the fall; it’s so unbearably tender and it’s everything Katsuki’s ever wanted. “I’ve never wanted anyone like I want you. Nobody else could ever drive me to the very edge just by being in the same room as me like you do. You have no idea how fucking crazy I am about you, baby. I’d kill anyone who even touched you. I’ve driven away every single alpha, beta, or omega who’s so much as looked twice at you. I’ve marked you in ways you’d never forgive me for if you knew. I’ve made sure everyone knows exactly who owns you since you presented. I’ve done everything in the book and then some to make sure that this was always guaranteed to happen. Maybe it makes me an awful human being, but I promise I’m going to make you so happy. I’m going to give you everything you could ever want. Just please never leave me. You don’t understand how much I… you don’t know… fuck.  I’d die without you, Izuku. If someone took you away from me I’d burn the whole world until I got you back. I love you so, so much, darling.”

The confession is mumbled so quickly and quietly that Katsuki doubts the words are understandable. All the while his hips gyrate in wet sloshes, Izuku gasps every time his cock presses in, the fire crackles. He doubts that Izuku heard him, but he needed to get the words out before his love choked him. He’s been holding back his feelings for so long that he doesn’t know what to do with them all now that he can freely express them. He knows he’s a lot, knows that he’s needy and protective and so goddamn overwhelming, but he doesn’t know how to stop. Sometimes, he’s still so fucking scared that he’ll drive Izuku away again. 

But then, “I love you too, daddy.”

Katsuki makes a low, wounded sound at the back of his throat, face contorted with the force of his emotion, fangs throbbing in his mouth. He would walk on fiery coals, would pull kings and gods from their thrones, as long as he got to hear that over and over again for the rest of his life. 

“Say it again.”

“I love you, daddy.”

“Again.”

By the time Katsuki’s knot starts inflating, Izuku’s eyes are hazy. Instincts in full control as his sharp omega fangs drop in preparation. Katsuki is perhaps a little too eager to get his son’s teeth in him. He’s wanted it for so long. Even longer than he himself realised. 

The knot pops and Katsuki’s fangs slice through the skin around Izuku’s scent gland. Pheromone-rich oils coat his entire mouth and tongue as he comes, burning his throat and nose until he’d know his mate's scent anywhere. In the same moment, Izuku’s fangs close around Katsuki’s and his entire body shudders and melts. Their pelvises stick together as Izuku squirts and locks around his cock, growling deep in his throat.

Blissfully, he flops down over the omega, lazily sucking at the gland in his mouth until the shakes die down. 

When he finally gets the strength to pull back, the sight of Izuku, his baby, his darling, his omega and son with the indents of Katsuki’s teeth around his gland and Katsuki’s come gently rounding his stomach is nearly his undoing. He’s wanted this for so long that he can’t quite believe it’s really happening. One moment, his fingers trace the sluggishly bleeding marks and then the next he’s biting at the gland on the other side. Just to be sure.

Izuku is his forever. No one can take him away from Katsuki, not even Izuku himself. 

He’ll have to tell his personal assistant to pull some strings to get the divorce processed quicker and move up their wedding date. As much as he likes Italy in autumn, the backup spring wedding he’d planned in Japan surrounded by cherry-blossoms will be just as lovely. 

He hopes Izuku won’t mind that all the details have been decided already. But then, his baby has always preferred Katsuki to make the decisions. It’s Katsuki’s job to make sure that they’re good decisions, and this is one that he’ll make sure Izuku never regrets.

Chapter Text

It turns out, fucking your dad doesn’t change much about your general daily routine… If you’re Izuku, that is. 

Maybe it’s a little different for Katsuki, who’s had such a large gap between their time together openly in the past and the present day, but for Izuku it just feels like getting back into a routine. 

More often than not he wakes up in the morning, encased in solid arms pulling him tight to an even more solid body, to savouring kisses being pressed down his nape. Half the time, Katsuki’s still inside him after the night before and he eases out with a deliciously wet flop of his semi-erect penis. Sometimes, he pumps back in again, slick with his own release, and Izuku’s swollen insides are plundered anew; sometimes Katsuki heads to the shower, late for work and - as Izuku suspects - having already taken his pleasure before Izuku wakes up. Katsuki’s gotten into some bad habits in that way.

Either way, cum always leaks out of his gaping pussy, thick and lurid, making him rub his chafed thighs together from the ticklish sensation. His tummy distended and heavy where it should be only slightly plush.

This morning it’s the latter and Izuku wakes up hot, needy, and thrumming, but so swollen he aches before he’s even opened his eyes. He glares balefully at his dad as Katsuki eases out his cock with a shhhlup noise and gentle drizzle of frothed cum that he wipes off on Izuku’s thigh. He heads off to the bathroom with a cheery whistle without even a compromising fiddle with Izuku’s clit, discarding him on the bed like a used up, leaking fleshlight. Katsuki’s wet dick lightly smacks against his thigh with every step, the signs of a deflating knot enlarging the base more than usual. 

Bastard. 

Katsuki really had gotten too used to taking Izuku in his sleep in the time before they officially got together. Just because his dad naturally wakes up much earlier than Izuku doesn’t mean that he should get to leave Izuku gaping open in a puddle of slick and cum with no conscious orgasm to show for it, like Izuku is just a bedwarmer, a fuck toy for his father to use whenever he wants.

He moans quietly into a pillow at the thought, hands skating down over his newly heated body, past pebbled nipples to his well used hole to feel how it leaks and contacts. Just a brush of his labia up to his clit and sparks shoot across his entire body, but Izuku stops before he gets lost in the motion. 

It would feel better if it was dad's rough fingers touching him.

Grumbling, he tries to stand on wobbly legs to limp into the bathroom. He’s got a bone to pick. 

He fails. He flumps back onto the bed almost immediately, a frustrated huff escaping his chest when that just sends more aches shooting up his spine. His pussy throbs. 

“Dad!” he calls. “Come help me.”

His exaggerated irritation must be audible, because Katsuki appears in the next second. He carefully eases Izuku into sitting up, fussing all the while, and picks him up onto his hip, disregarding the sodden mess between Izuku’s thighs that trickles down his hip in favour of getting one giant paw on Izuku’s ass cheek and squeezing. Katsuki uses his free hand to pull away the strands of hair clinging to Izuku’s face, freeing up his forehead for a kiss and a nuzzle. An inhale near his temple as Katsuki checks Izuku’s irritation is only faked and not an indicator of true pain or discomfort. 

That’s more like it. Izuku snuggles back into the coddling, letting loose crackly little irritated purrs, just so Katsuki knows he’s not off the hook yet. He’s kind of tempted to grind his pussy against Katsuki’s hip, but he hasn’t got the right leverage to do so and so hangs there, dripping and unsatiated.

“Sorry baby, I won’t do it again,” Katsuki lies as he hugs him close. It’s not the first time he’s promised this. “I just couldn’t wait. You looked so cosy and soft, like a little sleeping princess. I couldn’t bear to wake you up, not when you need your sleep. I was just gonna rub against you but you were so wet and open that my knot just slid right in.”

Hidden in Katsuki’s neck, Izuku rolls his eyes. 

The bathroom is hot and humid when they enter. The filled bathtub waiting for them sinks into the floor, more mini-pool than bath with its size. To enter it Katsuki has to take steps down into the basin. 

It's already prepared, steaming and fragrant-smelling. The water is lovely on Izuku's aching body – Katsuki must have added the special bath salts to help revitalise a fatigued omega – and he fully relaxes into it as Katsuki sits down behind him in the excess of space, legs bracketing Izuku and chest pressed to his back. He leans back and lets Katsuki take his weight. 

Katsuki lets him relax for a little bit before starting to wash him. He scrubs off each limb so carefully and worshipfully that it feels like its own form of foreplay. Eventually, when Izuku is butter-soft with contentment, Katsuki’s hands creep up to lather his nipples with teasing strokes until Izuku’s shifting and squirming, pressing into his hands. The fire that had calmed down roars back to life and he mewls with the need for more. Chuckling, Katsuki cups his breasts with warm hands and pulls Izuku back firmly against his chest as he pulls and pinches Izuku’s nipples with more force, sending shocks and shivers straight down his spine to his throbbing pussy. 

He’d be slightly more embarrassed about how slutty the moans he releases sound if Katsuki's reciprocal hard on wasn’t pressing insistently against his spine.

When he's on the cusp of complaining, Katsuki's hands get lower and lower, until he’s running both palms down Izuku’s bruise-dotted thighs, squeezing and groping the soft flesh. 

“Spread your legs for me darling.”

Izuku does, but it doesn’t seem enough for Katsuki. He shifts them so that both of Izuku’s knees are hooked around the outside of Katsuki’s so that the alpha can keep him spread open to his liking; only then do Katsuki’s fingers creep down and dip in between his gooey, overly sensitive folds. The first touch makes Izuku twitch and flinch with a moue of discontent that Katsuki kisses away. He does want to cum – believe him, he desperately wants to cum – but his slit is too sensitised to use straight away. 

“No more,” Izuku complains between kisses. “Just my clit, daddy. Please.”

Katsuki’s eyes are two black, hungry voids, barely any red to be seen. “Shh, daddy will touch your clit, baby, I just need to clean you out too. Hold still for me.”

Minutes later and Izuku pants heavily as Katsuki’s fingers pump languidly in and out, paying special attention to his g-spot and the band of muscle that ties around the knot, brushing against them continuously while the other hand expertly rolls his clit between gentle fingers, working together to wind Izuku up into a desperate mess. The water between his thighs has long since turned cloudy.

“You’re not getting deep enough, Daddy,” Izuku whispers silkily, lips brushing the stubble of Katsuki’s jaw. 

“I’m not?”

“You bred me too well. You need something longer to get it all out.”

Katsuki spreads his knees apart, pulling Izuku’s with him. His fingers delve deeper and sluice through his insides. “I think you might be right,” he teases, pulling his fingers out to show off how they glisten with a thick layer of cum. He offers them to Izuku and growls when he diligently cleans them off. “I think I’ll need to use something more effective on a pussy this greedy. Good thing Daddy has something perfect for the job.”

He stands them both up and presses Izuku down to bow over the edge of the pool-like bath. 

“What is it?” Izuku feigns innocence, dizzy with more than just the scorching heat of the bath. His well-trained cunt slicks with anticipation, sticky dribbles of old cum and new arousal trickle down his swollen lips, their path avidly observed by hungry red eyes. Izuku tips his hips up and falls into presentation on habit, bracing himself on the edge. 

His moan echoes against marble tiles when Katsuki notches the mushroom head of his cock into Izuku’s fluttering hole and then slowly slides home inside him. Displaced cum oozes out around his cock and plips into the clouded water as he savours the hot, rippling walls that cling tightly to him. Katsuki doesn’t stop until he’s crushing up against the resistance of Izuku’s cervix, completely filling him. He pushes in a little deeper, testing that hard ridge, and feels how Izuku’s entire body throbs around him with his flinch and low moan.

“Is that getting deep enough?” Katsuki growls huskily, almost purr-like with his pleasure. His cheeks and neck are flushed red. Muscles, covered in a fine layer of glistening steam and sweat, clench and relax as he restrains the impulse to fuck in and in and in. To pull that svelte figure back on him by the arms or hips until Katsuki once again swells and releases inside the tight, wet orifice that belongs to him.  “Is daddy getting deep enough inside his son’s filthy pussy this time?”

“I’m – I'm not s-sure, daddy.” Izuku's thighs quiver traitorously, on the verge of losing strength. “I think you need to get – nngh! – deeper than that.”

Katsuki's unseen smile is menacing. “Anything to make you happy, darling.” 

One day, once Izuku’s a little more experienced, Katsuki’ll carry through on that promise. He knows it’s possible for him to go deeper. To test and push past the inner limit of the cervix in a way only a very few, very rare omegas are able to allow. The ultimate show of submission to their alpha and breedibility, to directly fertilise the womb in such a way that the minimum amount of gifted cum is lost.

Either way, he vows to make it possible. 

He wasn’t planning on going that far today, but the idea is in his head. Testing, he holds Izuku in place as he saws his hips; pushes that little bit deeper; and Izuku rattles out the sluttiest moan he’s ever heard as Katsuki bullies his cervix. His entire body shudders, feet slipping a little as his thighs give out, muscles too busy squeezing around the cock inside.  

Katsuki laughs a little at himself internally at his own previous doubts. Of course my perfect little boy would be the one in a million. 

Still, practice makes perfect and Izuku needs to start getting used to it. Katsuki pulls Izuku’s arms behind his back and uses them to pull his son’s shaking form back on his cock, bucking his hips as he sets a heavy rhythm that presses against the gulping throat of Izuku’s cervix. 

Barely a few deep thrusts are all it takes. Izuku comes, wet and wailing underneath him, bucking like a wild-broncho. Katsuki holds him in place, whispering praise in his ears as he continues his pace to reach the end. But, contrary to his expectations, Izuku isn’t entirely satiated with just that. 

“Need a knot! Daddy!”

“No, darling, there’s not enough time.”

“But-!” 

Katsuki doesn’t let Izuku finish talking, he fucks in deep –the deepest he’s gone yet, a tight, pulsing grip around the tip of his cock– and groans from the chest as he cums and cums. “ Fuck. Shit – you feel so good baby… Shh, don’t cry. Daddy decides if you get a knot or not. Just be good and take it.”

“Daddy! Daddy!!” 

Katsuki doesn’t knot, much to Izuku’s vocal disappointment. And Katsuki’s own, if he’s honest. He has to hold a sobbing, hissing Izuku down as he scrapes out the newest load to get him properly clean for school, forlorn as clumps of his cum are removed. What a waste.

He pulls the plug, letting the filthy, clouded water release down the drain, and starts up the shower head to properly rinse himself off, leaving Izuku to sulk in the corner. Instead of doing the mature, fatherly thing and insisting that Izuku come over and rinse properly, Katsuki stays quiet and lets him do as he pleases. If it’s because he likes the idea of Izuku covered in a fine layer of Katsuki’s cum from head to toe while they're separated, that’s his business. 

In the face of Izuku’s teary pout, Katsuki chuckles. “As much as I love knotting you, we need to actually eat at some point this morning. You have school soon, and I have work. You can't sit on my cock all day.”

Well, not every day at least.

Izuku frowns briefly before he goes back to pouting pitifully and Katsuki has the briefest thought that he may have spoiled his son somewhere down the line. 

“Call out today for me, please Daddy? Want you so bad.”

Katsuki lightly swats at Izuku’s side and pulls his needy baby out of the bath to get him dried off and dressed. “You still have school.”

“You never seemed to care about that before. What happened to ‘you don’t need school, baby, I’ll look after you. I’m a sure prospect’”?

“What happened to ‘I like going to class’?”

Huddled in his towel, skin flushed from the heat and sparkling with a fine layer of cum-infused water, Izuku’s adorable pout is amplified to the max. Katsuki flicks him on the forehead and kneels to help him put his underwear and thigh highs on. He heroically resists the urge to give Izuku's pussy a quick lick while he's down there. 

But he just smells so good. Thick and heady with sweet, salty arousal. Tantalisingly close. Katsuki’s mouth waters, tongue wetting his lips. Izuku watches him with a knowing look in his eyes and pops a hip, purposefully opening himself up just a little so more of that delicious scent peeks through from the crack of his thighs. 

Later, he promises himself. If he gets Izuku's slick on his tongue he won't be able to stop drinking him down until he finally loses feeling in his legs.

“C’mon, darling, don’t be like that. It breaks daddy's heart when I can't give you what you want. You know that I would keep you with me and give you all the orgasms you wanted if school wasn't for the best.”

Because Katsuki raised him well, Izuku doesn’t put up more of a fuss as Katsuki dresses him, choosing a cold-shoulder crop top and skirt that Izuku changes into as Katsuki dresses in his customary suit. Izuku chooses Katsuki’s cufflinks and tie in return: a pair with green emeralds that Izuku had gifted him for fathers’ day last year, and a silk tie that Izuku thoroughly wipes against the scent glands on his throat before handing over.

It's a test of Katsuki’s restraint to not bend him over there and then at the show of possessiveness. 

Katsuki should’ve known the good behaviour was just Izuku biding his time. They take breakfast at the kitchen island sitting side by side and Izuku cajoles Katsuki into cutting up and feeding him his pancakes, taking each bite with a teasing pink mouth and tiny kitten licks to pick up any flecks of syrup. Katsuki’s breakfast sits forgotten to the side, the owner mesmerised instead by shiny, oil-covered lips and the little satisfied moans Izuku keeps letting out.

There are strawberries accompanying the pancakes. Katsuki hand feeds them to Izuku, a clench in his gut when Izuku takes them delicately, engulfing the very tips of Katsuki’s fingers into that plush, whorish mouth and sucking. 

Katsuki is only human. He has Izuku pulled up to sit on the kitchen counter before the omega can even blink coquettishly, trousers unfastened just enough to pull out his cock and fist it once or twice as it hardens completely. Izuku’s eyes shine with victory as Katsuki flips up his skirt and pushes the underwear he chose to the side. Izuku’s hole, still soft and relaxed but glistening with a fresh coating of slick, winks at Katsuki luridly as he pushes Izuku down to recline on his forearms.

Izuku stops him before he can go further with a socked foot to his hip, and Katsuki nearly goes fucking feral. 

“Wait — the staff.”

If Katsuki wasn’t tunnel-visioned on getting balls deep inside Izuku within the next few seconds, he may have seen it for the test it was. 

Alas. 

“Ignore them,” Katsuki orders, knocking Izuku’s leg aside and fucking in deep with his first thrust. The force of it shoves Izuku onto his back, who moans and flutters dewey eyes as he’s skewered once again. His blushing, overwhelmed face on full display to the rest of the room as he rolls his head to the side, body jolting as Katsuki sets a desperate pace.

Katsuki misses the half-lidded look of blissful satisfaction Izuku sweeps to one of the newer maids; one who Izuku may have noticed lingering too close to Katsuki since she was hired, always popping up with coy eyes and loaded offers to make herself useful. 

Now her eyes are almost comically wide and fastened on Katsuki's fat, turgid cock and the way it bullies its way inside Izuku’s small body; so big that only an omega could take it – and even then, only one with a deep, stretchy, well-trained cunt – without breaking. The knot growing at the base, already covered in splatters of slick, promises to grow so immense it borders on vulgar: impatient-looking as it grinds in and out with audible, wet plop — plop — plops, stretching Izuku’s pussy to the point the skin pales around it.

When Katsuki pushes balls deep she gasps at the bulge that pushes out against Izuku’s stomach. The kitchen fills with Izuku’s little stuttering sighs as Katsuki fucks him with short, deep thrusts that hit against his most sensitive parts without relenting, interspersed with Katsuki’s grunts and muttered praise as he breaks in his son’s cunt once more. 

“Daddy! Getting s-so deep!”

“You’re taking me so well, baby-boy. Sucking me in. Fuck – you feel so good. You’re fucking soaking my cock, baby.”

“Daddy’s so big. Can feel you – feel you in my tummy.”

“Yeah, baby, you like it? Like daddy’s breaking in your little pussy?”

Izuku’s legs flex around his hips. “Yes,” he mewls. “I’m c-close. Gonna cum.”

“Good. Good boy. Cum on daddy’s cock.”

Katsuki pauses and pulls out his dripping, veiny cock. He pulls Izuku leg onto his shoulder and braces the corresponding arm above Izuku’s head, splitting him apart so he can fuck in even deeper, taking his time with it this time to push and pull with his entire length. It shifts Izuku onto his side. Allows everyone else to see just how far up his stomach that bulge goes. How, when he fucks in at the deepest, Izuku’s eyes cross with pleasure that mewls out of a slack mouth. Which twists into an almost smugly blissful smile as his eyes roll back into his head, body tensing as he cums.

“YES DADDY! YES! THANK YOU~”

The maid scampers away, eyes averted and cheeks scarlet. Izuku’s lewd moans follow her out, almost mockingly, as he proudly takes his father's cock for all to see, seemingly luxuriating in the stretch of his abused hole. 

No, Katsuki misses it entirely. He’s too focused on the transcendence of pushing through a hot, gooey pussy and embedding himself where he belongs. 

Izuku's cunt welcomes Katsuki home, taking him in easily and squeezing around him in the most intimate of hugs; the slide of their bodies wet and almost frictionless, a result of Katsuki knotting Izuku last night, sleeping with it inflated inside, and then knotting him again this morning. But no matter the number of times Katsuki uses Izuku, the size of his cock relative to the size of Izuku in general means there's always at least a little bit of a squeeze. 

Katsuki would feel bad about the demands he places upon Izuku’s addictive pussy, but the ample slick and the extended, seismic orgasm Izuku gives him shows that it’s not just Katsuki who needs this.

“Fuck, baby, squeeze just like that. Feel so good for daddy.” 

Katsuki’s thrusts speed back up, staying deep as he rocks Izuku up and down on the counter with short, hard jackrabbits of his cock. Not that Izuku seems to mind; his eyes still unfocused as he recovers from his orgasm. Oversensitive, swaying back on Katsuki’s cock as much as he’s able. His mouth opens as he babbles incomprehensibly, tongue sticking out.

Katsuki chuckles when he sees it. “You’re such a slut for daddy’s cock.”

“Love it so much. Need it – need you to use me!” 

“Yeah? Need daddy to use your tight little hole, princess? Show me how much you enjoy being used as his fleshlight and maybe daddy will touch your pretty clitty, yeah?”

Izuku blushes like he hasn't been fucking begging for his father’s knot all morning. “O-ok, daddy.”

Izuku pulls his crop top up to expose his puffy nipples. His head rolls back on the counter and he goes limp as he submits completely. One of his hands reaches up to hold Katsuki’s wrist where it’s braced on the counter, while the other hand flutters over his body seductively, caressing his nipples and throat. Interspersed with his shuddering mewls when Katsuki pushes in, he quietly moans at his own touch, putting on a show just for Katsuki to see: A tableau of just how much he’s enjoying himself instead of just saying how much he likes to be fucked within an inch of his life. 

It’s fucking hot. Katsuki’s succubus of a son seducing Katsuki for his life-spirit in the form of cum. His little kitten, fat and full of milk and yet still whining for more. Without Katsuki realising, his thrusts slow down as he watches, transfixed. 

Holding eye contact, Izuku’s hand moves to the bulge in his stomach, slowly and provocatively stroking Katsuki’s cock through the barrier of his body. Where the tip pushes out against his tummy, Izuku uses two fingers to roll Katsuki’s cockhead over the sucking mouth of his cervix.

Katsuki’s brain flatlines. He can feel it. He can feel Izuku’s hand through his stomach.

“Hah, just one orgasm and you’re already acting like a fuck toy,” he croons darkly. “Don’t worry, daddy knows what you need.”

He keeps his thrusts slow, but fucks in hard, keeping himself relentlessly deep to push on all the places Izuku likes best. Grinds against Izuku’s cervix and luxuriates in having his entire cock covered in tight, squeezing heat when Izuku locks down on him. Static fizzles in his brain where thoughts should be.

Izuku’s legs quake. “Daddy yes, just like that! Harder!! Deeper!!!”

Entirely forgotten, the staff shake out of their stupidification and bustle as they quickly and unobtrusively find somewhere else to be. They’re too used to this by now. One takes Katsuki’s unfinished breakfast with them to bag for his car ride to work. Another removes Izuku’s plate and glass to prevent any broken houseware. 

Neither Katsuki nor Izuku take notice of any of this. 

“You little tease, baby boy. Who raised you to be so insatiable?”

Katsuki clearly isn't doing his job right because Izuku has the wherewithal to make the most unimpressed expression. “Who do you think?”

“Are you saying this is my fault?” Katsuki deliberately grinds slowly on Izuku’s g-spot, delighted when Izuku gurgles and tightens over him. “Better take responsibility in that case, huh? Keep this greedy pussy full. Only, it seems I can’t be out for more than a few minutes before you’re wet and mewling for more. Even in your sleep your pussy weeps for me, desperate to be filled and taken. I warned you before: the best cure for a messy hole is a good knotting, and yet you're so ungrateful when daddy keeps you locked up at night instead of letting you sleep in a puddle of your own juices.”

Izuku wants to interject. He wants to say the only reason he gets so worked up in his sleep is because Katsuki makes a suckle toy of his clit and plays with it all night long to glut himself on slick while Izuku can't push him away. He wants to say that of course he leaks: Katsuki's cum is often so deep and plentiful that there's nothing to do but let it dribble out. 

“It's – nngh – daddy's fault,” he slurs. 

Katsuki seems to have forgotten that he’s still slowly grinding over Izuku’s g-spot with the fat head of his cock, and Izuku’s tummy is starting to feel all hot and tight once more. It makes thinking difficult.

“My fault?” Katsuki has the gall to act innocent. “Me, your loving father? I do nothing but make sure your pussy gets the care and attention it needs and this is the thanks I get? So ungrateful. I’m starting to think I should just keep you on my cock 24/7. Would that finally make you happy, darling? Should I take you to work to be my little knot-warmer while I'm in the office, working to provide for your every need while you tend to me, cock-drunk and drooling as I pump you full? Take you to meetings and show everyone what a pretty knotsucker I've raised my son to be. How well he takes it in any of his holes. I bet they'd be so jealous when they saw how deep you take me, getting fatter and rounder the longer the meetings go on. Just a mindless toy for me to use to feel good around my cock; a cumdump to empty into whenever I wanted. Would that finally be enough?”

Izuku should be objecting to that. He really, really should. 

“Nnnrg! Daddy, yes!!” Izuku crosses the leg that hasn’t been forced above his head behind Katsuki’s back, trying to pull him deeper. Harder. He’s going to cum. He’s so close. He’s so fucking close. He just needs a little –  “More! Gimme more!”

“More? What more do you want, baby-boy? You only need to tell me and I’ll give it to you.” Izuku bites his lip, but Katsuki pulls it out with a chiding tsk. “None of that. You just have to say it.”

“Knot. Want your knot. Want you to fill me up and plug me so I can carry you with me to school. Want to be able to feel you sloshing in my belly. Want the other alphas and omegas at school to know that I’ve got the best alpha in the city servicing me everyday, all day. Want them to know that my daddy keeps me full and more satisfied than any of them could dream of doing or being.”

Izuku’s words crackle from Katsuki's ears down his spine to his groin and right back up to the base part of his brain stem that belongs to the primordial beast in him, a burning heat left behind that tingles in his fingers and cock. For a moment, Katsuki thinks he might pass out there and then.

“Fuck, darling,” he pants, thrusts speeding up and getting irregular embarrassingly quickly. “Who taught you to speak like that?” 

A film of tears glisten over Izuku’s eyes. “Rub my clitty, daddy, please. So – ah! – close. P-please. Need to come. Need to milk you like —ah!— good omega.” 

“Christ.” Katsuki is helpless to do anything but acquiesce. He’s too close to the edge, heat cresting in his groin. His fingers hasten to slip over the sodden mess between Izuku’s thighs. His poor little clit is red and inflamed with arousal, and Katsuki's thumb presses in tight circles that he knows Izuku likes best. “Come for me, baby. Come for daddy. You’ve been so good – so good. Just gotta let go now, ok? Daddy's got you.”

Izuku comes, loud and violent. His leg squeezes around Katsuki’s waist so hard that he has to pull both knees over his shoulders and force Izuku down into a mating press, holding him open at the thighs so he can’t crush Katsuki between them. Like this, his cock pushes in deeper: every inch clutched in the rippling vice of Izuku’s heavenly cunt. His knot flares at the needy squeezes as Izuku, like the perfect omega he is, damn near sucks his cock off. 

Katsuki presses as deep as possible. Lets the knot grow inside and spread Izuku wide around the fat girth of it. Delights in the whiney groans Izuku lets out as it expands. This deep, his cockhead is forced up tight to Izuku’s cervix in a way that for anyone else would be agonising, but for an omega of Izuku’s calibre should be a pleasure so absolute it borders on mind-breaking.

Katsuki's never made Izuku take it this far, and his poor boy is soon overwhelmed. Pin-point pain scratches in lines down his sides as Izuku claws at him, eyes wild and lined with tears. 

“Noooo, no, dad! Too deep! Too deep!!!”

“Shh, it's ok.” Katsuki catches Izuku’s hands and holds them above their heads. He presses down with his body into the cradle of Izuku’s thighs. “You can take it. Just breathe and let daddy in.” 

Izuku gasps in quick staccato breaths — “Ah! Ah! Ahh!” — thighs quaking so hard it shakes Katsuki’s entire body as the tip of his cock slips into the tightest of crevices. “I can't. I can't! It's too deep, it's—” his eyes roll into the back of his head, face in a rictus of pleasure as sudden wetness soaks Katsuki's pelvis.

It does nothing to dissuade Katsuki. Nothing could make him stop now.

“Pregnant. Gonna – gonna get me pregnant,” Izuku gasps. “Daddy’s gonna get me pregnant!”

It’s not possible. And yet those words ignite such a fervid heat in Katsuki that he loses himself entirely. Nothing on his mind but the need to cum deep and hard so that he can fuck a baby into his son. He presses down, pushes deeper, and slowly, achingly, spreads his son apart at his very core. 

“Baby. Baby. Baby,” he mumbles, entirely out of his mind. “Gotta fuck a baby in my baby.”

At the knots widest and with the crown of his cock pressed directly up against that inner limit, pressing into Izuku’s cervix just the slightest, Katsuki comes with a roar. 

“Ah! Daddy! Daddy!!!” Izuku sobs. His socked legs kicking out as he’s jostled on Katsuki’s renewed efforts to knot-fuck him, grinding deep and mindless as instinct takes over. Over and over, pressing rabbit-quick jabs as the mouth of Izuku’s cervix sucks him in. It pulsates maddeningly around the sensitive head of Katsuki’s spraying cock while his knot reciprocally crushes against the omega’s g-spot until it’s all Izuku can do to squirt as his tie snaps down around the thick, pulsing burl stoppering up his thoroughly creamed hole. 

The splattered warmth over Katsuki’s pelvis just drives him on, as do the strengthened contractions of Izuku’s pussy as they drive each other into a raging circle of climaxes. Even with his cock prying open the boy’s cervix, there’s just too much cum in something already quite full. By the time it’s over even the knot is struggling to hold back the ocean of cum in Izuku's slack, ruined pussy. It drips out in thick, frothy lines of white, and that just won't do. Not after all this effort Katsuki has put in to breed his son. 

With age comes knowledge, and Katsuki knows exactly what to do in this situation. His buddies at the club have such interesting tips and tricks to keep your omega sated.

Katsuki pumps his hips a few times. Wills his knot to grow larger for the second time today. Bullys Izuku’s exhausted cunt to clench and tie him down tighter with deep, scraping thrusts with one thought on his mind:

“Get pregnant. Get pregnant,” he growls around a mouthful of fangs and dripping saliva. “Mine… You’re mine.”

He forces himself to cum again and the knot flares larger. The tie snaps down on it and his orgasm this time is almost painfully good.  He can’t stop himself from going a little crazy, groaning from the depths of his chest, growling and fucking in tight little rolls as he comes so hard it feels like his soul is being sucked out of his throbbing cock. His knot dilates so much he can’t move an inch within the newly tight confines of Izuku’s cunt. His cock grows that little bit more, but Katsuki's so deep it pops into the tight fist of Izuku's cervix, who squeals like a stuck pig and cums so hard that Katsuki wonders if he might have pissed himself. 

“That's my boy. That's my boy. Just hold on - daddy's got you, baby.” Katsuki shoves his nose in Izuku’s hairline and huffs in his sweet musk through a gaping mouth, scattered praise falling from his mouth as he peppers slobbering kisses wherever he can reach.

Izuku's legs drop from his shoulders and hang limply either side of Katsuki’s waist, stained thigh highs slipping down his legs as Katsuki collapses over the heaving chest of his son. The staff that peak around the corner of the door can only see the broad back of the alpha, sweat-soaked shirt clinging to every muscle; his firm, undulating buttocks; testicles that drip with a myriad of liquids; trousers shoved down around his ankles; and then two slim, stocking-clad calves sticking out from either side of his chest, neat little Mary-Janes kicking the air as Katsuki breeds the helpless omega stuck underneath him with savage-sounding growls.

With a final grunt, he settles, satisfied with the strength of the tie and a little dizzy from having so much blood directed towards his cock instead of his head. 

Katsuki’s pants, weak in the knees. Below him, crushed into the counter, Izuku makes wet little keening noises, drool leaking out from the corner of his slack mouth. His half-lidded, glazed eyes stare sightlessly up at the spinning fan on the ceiling, like a baby with a mobile above its cot. It’s unclear how long he’s been this way. 

It may have been since Katsuki’s first knot. 

Oops. 

When he can resuscitate the brain cells needed to formulate words, Katsuki says: “You’re going to be so late for school.”

Izuku doesn’t even twitch.

Chapter Text

It doesn’t take long for Katsuki to recover; the joys of being an alpha and biology necessitating that he be able to awake and aware enough to protect the omega fastened to his knot, even after cumming so hard his brain melts. 

Soon, his legs are strong enough to at least take most of his weight off Izuku and he calls out to the staff to return. They enter quickly enough, resuming their places wherever they need to be. None of them so much as blink at the sight of Izuku hanging off his knot: they’re all experienced in working in elite families, they know what to expect. He even hired them specifically because they had all been trained in the traditional style (though he'd warned them not to expect to perform any… duties to the alpha of the house). And it’s not like this is the first time this has happened either. 

“You, get me some water and a straw,” he points to the first one through the door. To the next he orders: “Prepare my breakfast for the car. I’ll take it to go. And tell the driver I’ll be out soon; we’ll be dropping Izuku off at school on the way.”

To his butler, he says: “Call the school. Tell them Izuku is going to miss his first period, and not to pull him up for it.” 

And then, to the housekeeper – an older lady who has worked for his mother since Katsuki was young, and thus the most traditional of them all – he says: “Auntie, please go to our room and collect his plug. The large one with an inflatable knot. Get me a towel, a new pair of trousers, and underwear too. And a shirt.” He looks down at the puddle of slick and cum underneath them. “You know what? Just bring me an entirely new outfit. Shoes too.”

“And for the young master as well?” She asks. 

“No,” Katsuki decides as he fusses with Izuku's thigh-highs. His skirt luckily had ridden up enough to be mostly dry. “The young master is perfect as he is. But get me another towel to wipe him down, and some warm water.” 

They all nod and disperse to do as he says. 

Katsuki turns back to Izuku and covers him back up with his body, holding him close as he reverently licks up Izuku’s neck and over scent glands weeping with the force of Izuku’s pleasure. 

Happy omega. Pleased omega. Horny omega. My omega. Katsuki delights in the pheromone messages Izuku’s oils convey. 

“You were so good for me, baby,” he whispers. “So good. My sweet baby boy. Daddy was so mean and beastial this morning, but you can take your time now. I've got you.” 

“Thanks, dad. Liked it,” Izuku says, barely audible.

Katsuki preens. With the green light given, after several more minutes of cuddling he stands up and surveys the mess he's made of his son. 

Izuku is so fucking beautiful, it's actually a little hard to believe just how lucky Katsuki's gotten in life; despite - or, perhaps, especially - the fact that his first (tragically lost) love turned out to be his entirely too fuckable, time-travelling son. 

What can he say? Izuku is gorgeous and only more so when covered in Katsuki’s cum.

With Izuku still out of it, Katsuki takes a minute to appreciate the results of his hard work. He pulls Izuku’s limp thighs apart, unable to resist thumbing at the thick, blood-swollen lips of his slick-slippy labia to see where he’s lovingly gripped around the incomprehensibly fat swell of Katsuki’s knot. It’s deep enough now not to be immediately visible, the entire ball of it swallowed up and hidden inside. But Izuku’s also loose enough that Katsuki can easily spread his hole to show strained pink-red skin at the base of the knot, veins swollen and thick around the entire circumference, drenched in clinging white strands of frothed up cum and slick. The veins flutter with his own heartbeat as he continuously releases little pulses of cum. 

God, his son really is the best omega, born to take his cock. No one else would be able to take that, let alone derive pleasure from it. 

Even now, Izuku’s puffy lips undulate gently with the suckling flinches Katsuki can feel across his entire engorged length from root to cervix-embedded tip, coaxing cum from him, even with the omega too fucked out to consciously do it. Entirely instinctual. Just Izuku’s innate desire to pleasure Katsuki as much as possible; to be bred fat and full. To pull from his heavy-set balls until there’s no more to receive. A need only equally met by Katsuki’s alpha body, primed for breeding after such sustained contact with a breedable omega, vigorously replenishing what is taken to make sure he can always give his omega more. More cum, more pleasure. More more more.

Katsuki can see it when his cock kicks just a little. 

Izuku’s stomach is rounding out. Too much cum, too deep inside. But Izuku’s been thoroughly broken in to enjoy being bred so well, and he doesn’t whine about it like he used to in the past, leaving Katsuki free to run his hands over it, pressing down to feel the hard pipe of his own cock under the cum-soft swell. It makes Izuku groan and shake, so Katsuki does it again, marvelling at the cream-filled dessert he’s made of his son.

He really should let Izuku empty some out before school but he also really really doesn’t want to. He’s too pleased with the results of his hard work. But maybe the discomfort from walking around with a tummy fat with cum will discourage Izuku from being such a needy little baby right before school in the future. Baiting Katsuki’s restraint when he’d been trying so hard to prevent this very outcome. 

Katsuki would scold him for it, but Izuku looks so happy on his knot. Blissful and gluttonous, an empty little fucked-out smile on his lips, dew-drop tears caught in his dark lashes and trails of them on his face that lead into messy hair, cheeks and chest flushed like a newlywed on their wedding-night. Maybe it is Katsuki’s fault that Izuku’s acting out: he’s gotten far too used to pleasuring Izuku in his sleep and assumed that will continue to satiate the omega, when clearly he’d underestimated how much of a cock-slut his darling is for his daddy. 

With the way he looks now, Izuku looks like the very stereotype of the young and fucked dumb omega that the entire world places on a peddlestool as the premium of sexual fantasy. All but pregnant with his alpha’s offerings in a way that makes his alpha instincts very, very happy. Katsuki would make millions just for offering a photo of Izuku like this — not that he would…

Though, perhaps…

Katsuki twists for his suit jacket hanging on the chair next to them and thankfully spared from the mess of their coupling. He pulls out his phone and snaps a few photos for later in the day when he's regretting his decision to send Izuku to school instead of following through and letting the omega service him in his office. Humming, he takes the handkerchief from his breast pocket and swipes it through the dripping mess between their pelvises. It never hurts to have his son’s scent for when he needs some stress relief. 

His phone starts ringing; he quickly refolds the handkerchief and puts it back in the pocket and accepts the call.

When the housekeeper returns with his requested items, she unobtrusively works with him to remove his trousers. She wipes them down thoroughly with a warm cloth and then dresses Katsuki as he discusses Daibaku’s finance report with the director who'd called him. By the time the call is over, Katsuki is once more presentable and fully dressed, while the omega on his cock is still unconscious, tummy noticeably inflated. 

Katsuki plays with his tits a little in a half-hearted attempt to rouse him. All it does is make Izuku's plush lips part on a mewl. Like a sailor to a siren call, Katsuki leans over him, taking a pebbled nipple into his mouth while his fingers slip down the soft curve of Izuku's stomach and to his engorged clit. Surely one more orgasm wouldn't hurt… he has so clearly denied his baby what he needs…

“Sir, the car is ready,” the housekeeper announces unobtrusively a few minutes later. 

Katsuki pulls away from Izuku’s pussy with one last loving caress of the dark, blood-flushed folds, tweaking teasingly at the clit just to feel Izuku tremble around him once more. He pulls the omega close, trying to get his floppy limbs into some semblance of carriable form. Arms around his neck, head buried in Katsuki’s shoulders, Izuku keens lowly. Katsuki rumbles back soothingly. 

“Sir,” the housekeeper approaches carefully, eyes politely averted in submission, “would you like some help getting him out to the car?”

Ah, betas, so helpful when they’re trained well. 

“Yes. Cross his legs around my back and keep them there. His weight is pulling down on the knot too much with them hanging loose.”

“Yessir.”

She, ever so careful not to trigger any protective alpha instincts, does so and trails out behind him as he waddles out the kitchen, down the hallway and out of the front door. The car is, as promised, waiting just outside with the back door open and ready for him, the chauffeur standing-by to close the door. Katsuki walks slowly down the steps to get there. Despite this, Izuku still whines as he’s jostled on the knot. 

“Shh, darling. This is what happens when you can’t hold yourself back. Bear with it for now.”

Together with the housekeeper and chauffeur, they arrange Izuku to be sitting on his lap in the back of the car, thighs either side of Katsuki’s. The housekeeper hands him his breakfast to eat on the way, and a separate box containing the requested plug. There's no accompanying towel for Katsuki to use to wipe off when he puts it in Izuku; she evidently expects Izuku to politely clean off his cock, as any dutiful omega should. 

Katsuki's not sure he'll be able to let Izuku go in any appropriate amount of time if he gets that fuckable mouth anywhere near him, but he doesn't call out for her to correct her mistake.

Eh, he'll just put away wet if he has to.

The chauffeur closes the door and in moments they’re pulling away with a near silent purr of the engine. The partition between the front and back of the car goes up without Katsuki saying a word.

He basks in the bright spring morning sunshine and the sublime feeling of his son's squidgy pussy suckling on his cock as he eats his breakfast. It's a quiet morning, the rush hour traffic won’t hit until they’re deeper in the city. For now, it’s just endless flowering trees lining the roads of his estate, fresh pastries melting in his mouth, and the delicious blooming scent of his most precious person under his nose. Izuku is dozing when Katsuki checks on him; the tie still strong, his cervix still plugged. There's a euphoric little smile on his face that Katsuki just has to feel against his lips, so he does, starting chaste and then licking deep into Izuku‘s plush mouth. A hum emanates from Izuku’s chest, pleased. A clumsy tongue wakes up to play with Katsuki’s.

The spurt of cum Katsuki releases into him is so thick that it pushes Izuku's stomach out to brush against Katsuki's.

Katsuki considers just ordering the chauffeur to go straight to the office. He can keep Izuku with him all day. It would make the endless boring meetings more bearable if he had a sweet omega clamped on his lap and Izuku’s witty little quips whispered in his ears. He wouldn't have to hear the droning voices of the shareholders if he had Izuku’s thighs hugging his ears and a wet pussy to eat. It would definitely improve doing paperwork if he was able to spread Izuku out over them and fuck him into spraying all over them. What could be more auspicious than signing important documents not only with his signature but with the scent of his omega's slick? The old farts on his company board might actually get off his back if they see him keep up traditions.

Ah, tempting. He really will have to try it someday. Unfortunately, he’s pretty sure that Izuku’s lessons are covering some pretty important information on the curriculum today, and they’ve only just got him caught up after his month-long interlude to the past made him forget some of his more recent topics. 

He consoles himself that as soon as school is over, he’ll pick Izuku up, pull out the plug, and slide right back in. Maybe he’ll take them back to the Drop on the way home and they can re-enact the chase Izuku denied him last time they were there. It would be good for Izuku to practise denying himself enough to run away. 

Yes, he thinks, fondling Izuku’s plush asscheeks under his skirt, squeezing their softness and then tracing around where he clings around Katsuki's slowly deflating knot, perfect.

Then he can get some of this frustration out, chasing Izuku’s short skirt as he drips Katsuki’s come through the forest. Running and aroused and -

Fuck, Katsuki needs to drop this train of thought before he crams more cum into an already overfull hole. 

He cuddles Izuku close, presses chaste kisses to his hairline, and basks in having his son in his arms and on his cock.

Izuku’s mostly coherent by the time they’ve trundled through the traffic to arrive at his school. Katsuki urges him slowly up and inserts the plug, inflating the knot to a level just shy of his own. It won’t be comfortable, but that’s Izuku’s punishment for being too tempting and provocative. Izuku whines and starts making sounds like he might start speaking again through the entire process, so Katsuki pushes him down on his back, puts two fingers in his mouth, and cleans up his pretty, sopping pussy until his thighs are shivering around Katsuki’s ears and the kids outside can probably hear his muffled screams.

After that, Izuku is much more sedate when Katsuki pushes him to kneel on the floor. 

“I'm glad you enjoyed yourself, but I'm still all messy, darling.” Katsuki holds his cock steady as he guides the head to rub against swollen lips. “Clean daddy up, will you?” 

Izuku looks up at him with soft, loving eyes that glitter seductively even in the dim light of the car. His devilish tongue is pink and tempting as it flicks over his head; he leans in to suckle at the slit and then pulls off with a pop, a string of saliva snapping from his lower lip. His hazy eyes close as if savouring the moment as he swallows his mouthful of leftover cum.

When his eyes open, they’re dark and lustful. 

“No hands, darling,” Katsuki reminds when Izuku moves as if to reach up. “Mouth only. Daddy doesn’t want your tricky fingers involved.” Izuku can get handsy when he’s down there, and Katsuki doesn’t want to be unduly tempted. This is just to clean him off after all…

Pouting, Izuku continues his teasing little sucks as if to reprimand Katsuki, hands demurely twisting behind his back, but he can’t help himself and soon Katsuki’s little angel is sinking down on his cock with muffled moans; deeper and deeper until his lips reach where Katsuki’s bracing himself. The more cock Izuku takes into the sweet confines of his mouth, the dreamier his eyes become until they almost glow. Instead of cleaning Katsuki off, Izuku makes him newly messy as he drools over him, the slick rhythm of his mouth filling the car with squelching gurgles. 

Katsuki groans, thighs jerking as he holds himself back with superhuman effort. “Fuck, you’re making daddy feel so good. So fucking good.”

Izuku whimpers, a high blush on his cheeks. He relaxes his throat, presses a bit further, and swallows down Katsuki’s cock into the rippling tightness of his throat. He pulls back and preens at the heavy globules of precum Katsuki’s cock spits out in reward for his efforts; he sucks harder, his tongue massaging the vein underneath as he once more swallows around the head. 

“Fuck. Fuck!” Katsuki braces a hand in Izuku’s hair and pulls him back, heart buzzing in his ears. Izuku whines, eyes pleading, but Katsuki is too busy pushing down his orgasm to care. “Too good, baby; I’ll knot your mouth if you’re not careful.”

The threat doesn’t land the way he expects it to. Izuku desperately pulls against Katsuki’s hold, tears leaking from his eyes, looking so betrayed. Katsuki almost lets him go. 

Almost. 

“Behave,” Katsuki reprimands, though the effect is weakened by his panting. He moves his calf between Izuku’s tense thighs, who shudders like he’s been tased at the rough fabric rubs against his bare pussy. “Behave, and I’ll let you cum again.”

Izuku nods frantically, and Katsuki lets go of his hair. Immediately, Izuku sinks back down on him, but is careful not to go too deep, despite the frustrated divot between his brows. 

Amused and so aroused he feels high with it, Katsuki lets his son have his fun. It's a test of restraint for Katsuki not to take it further, but missed calls are starting to make his phone buzz without pause, and he forces himself to not push Izuku down until he’s gagging with it.

Izuku swirls his tongue around the head of Katsuki’s cock and keens when it rewards him with another thick spurt of precum on his tongue. He’s so desperate for it, rocking back and forth on Katsuki’s sodden calf, sinking down on his cock like Katsuki won’t notice that he’s going further millimetre by millimetre. His baby wants him as deep as possible, and it breaks Katsuki’s heart to deny him what he wants. 

… Ah, maybe one load in his stomach wouldn't hurt. Izuku didn't finish breakfast after all, and Katsuki was too distracted to make him his morning milkshake. It wouldn't do for his baby to be hungry at school. He needs his protein.

Twisting a hand through soft curls, Katsuki pushes into the soft back of Izuku’s mouth, humming when his throat convulses around his cockhead, joining the melody of Izuku’s happy gurgles. He ignores the pinpoints of pain as Izuku digs his nails into Katsuki's thighs.

“Yes, darling, drink it all down for Daddy. You need this so badly, don't you?” Teary green eyes glitter as they look up at Katsuki with reverence, a pleading look to them as Izuku nods, pupils enormous as tears bead at the corners. Katsuki fucking throbs. “Good boy~ just like that.” 

As long as Katsuki doesn't knot his mouth it'll be fine…

Katsuki’s deflating knot plops out of Izuku’s mouth, covered in a thick, sticky varnish of saliva and cum. With his mouth empty for the first time in a while, Izuku pants, mouth slack and blood-swollen lips stained red and glossy with their own coating of cum.

It’s such a beautiful and arousing sight that Katsuki finds himself inspired by the idea of lip gloss infused with alpha cum. Personalised for only the most elite of omegas. Their alphas would pay an arm and a leg for it. Katsuki certainly would. 

He needs to get on the phone with the cosmetics department as soon as possible. He wants a glossy, socially acceptable coating of his cum on Izuku's lips for the next gala he has to attend.

To soothe the ache, Katsuki massages the hinge of Izuku's jaw, cooing at his poor, hazy-eyed cockslut of a son as he rests his head on Katsuki’s thigh. “You did wonderfully, baby-boy. Drank your milkshake so well, even though it was even thicker than usual.” 

Even as fucked out as he is, Izuku’s eyes gleam with suspicion and Katsuki smirks, gets his hand back in Izuku's hair, and directs him back to his semi-hard cock.

Alpha cum is addictive for omegas, and vice versa for omega slick for alphas. 

For a while now, Katsuki's been gradually increasing the dose of cum he hides inside Izuku’s shakes to the point that they're basically more cum than any other ingredient. Now he's drunk from the source so many times, Izuku may recognise the taste. But even if he's mad about it, he'll be even more dependent with such potent doses.

“Now now, gorgeous, you need to clean off daddy again after making him so messy. Ah~ yes, perfect,” Katsuki purrs as Izuku sucks one of his balls into his mouth with a hum of pleasure. “Such a perfect omega. Fuck, you're so docile with a tummy full of cum. I can smell your slick, baby-boy, are you clenching around the plug?” Izuku whines and Katsuki throws his head back against the headrest, praying for sanity against the mental image of Izuku sucking on his balls while his pussy drips and clenches around the meaty plug he’s still rocking against Katsuki’s calf, despite having cum not that long ago. Greedy for more despite the heavy deposit Katsuki’s already left inside him. 

Fuck, the end of the day can't come soon enough.

Katsuki looks down at his son, belly distended, mouth swollen, covered in Katsuki’s cum and scent, and so horny he’s loopy with it. 

“Yeah, I can't send you to school like this, can I?” He says. “Sorry baby, I really didn't mean to get so carried away.” 

Izuku comes out of his foggy state and shakes his head. “Silly daddy. It was perfect. I'm ok to go to school.” 

Katsuki looks at him doubtfully before pulling him up and onto his lap for a cuddle. He ignores the wetness of his trouser leg. “Are you sure? I can call you out for the day and help you catch up later.” 

Izuku sighs and relaxes into the hug with a pleased noise. “I'm fine, dad. Stop worrying so much.”

“Ok, I'll trust you to know your limits, but call me if you need to be picked up. Or need anything at all. Or if –”

“Ok, ok, I got it. I’ll call you at lunch time.”

“Good. Love you.” Katsuki pulls him impossibly closer, wishing it was possible to merge them into one being, even if just for a moment. He needs to be closer. He never wants them to be apart.

Izuku hugs him back with equal strength. “Mmm, love you too.”

They cuddle for several long minutes, slowly coming down from their highs. Eventually, Katsuki sends him off with a firm slap to his ass, watching as he totters off and up the front steps to the school with a flushed face and swollen lips. He can imagine how much Izuku is squeezing around the knot inside him, how his tummy must be sloshing with an excess of thick, hot cum. The teens around him make way like there’s a feelable bubble around Izuku keeping them away. 

Good. 

Once Izuku’s inside, Katsuki presses a button on the door to patch him through to the chauffeur. “To the office,” he orders. 

Feeling inspired, Katsuki debates who to call first as his driver pulls away from the school: marketing or cosmetics? It's a hard choice.

He calls the head of marketing. “I've had some inspiration for an ad campaign. I'll allow you to use Izuku in the new Presented line, as long as I have creative control over the entire thing. I've been inspired, you see...” 

Behind, with his back turned to the car, Izuku walks into school with a triumphant grin, his steps growing more steady as the car pulls away and Katsuki is no longer within view, though not without a wobble or two.

What a good way to start the morning. 

Daddy needs to be reminded that Izuku decides whether he gets knotted or not.