Work Text:
“Ah, home sweet home,” Saitama says as he steps into the hallway of his apartment with Genos in tow, shopping bags full of various food items dangling from his and Genos’ arms. His and Genos’ day had been nothing special; answering calls from Hero association and busting some various level monsters worked up an appetite for Saitama, so he asked Genos to shop with him so he could make them some dinner. The sky was already darkening as they made their way to Saitama’s home, but the older hero didn’t mind the cooling air of dusk settling around them, far preferable to the sweltering summer days a few months back.
After taking off their shoes and stowing them on the genkan, Saitama busies himself in the very compact kitchen of his new HA apartment, putting away food and leaving key ingredients on the table for the eventual meal he was planning on cooking for him and Genos to enjoy. He pulls broccoli and carrots from the fridge and sets them on the small countertop, but then he notices from the corner of his eye that Genos is putting on his pink apron and looking like he’s about to start cooking for them. That won’t do.
“A-ah-a, Genos, it’s my turn to cook,” Saitama tuts and waves a finger in front of Genos, who looks confused and a tad bit dismayed.
“But sensei—”
“No buts, I want to make my specialty stew for us and you’ve been busting your ass cleaning MY apartment and cooking food even when you no longer live in the same place as I do.” Saitama crosses his arms. “The least I can do is cook for us once in a while, no?”
“If you insist, Saitama-sensei,” Genos says without any more arguments and puts the pink apron back to the hanger.
Saitama smiles. “Good, now help me grab rest of the ingredients from the fridge so I can get started.”
Saitama shoos Genos away from the kitchen afterwards and quickly begins chopping and dicing some onions and sautees them on the frying pan, then adds them to the larger saucepan and gets to work frying some beef, slicing carrots and other ingredients he wants to add into the stew like broccoli. The smell of slightly cooked food gets him in a good mood and his stomach growls impatiently. He shushes and gently pats his belly and starts singing a song he heard on one of the anime he watched the other day. The intro song was a pretty catchy tune at least in his opinion.
“Hero ore wo tataeru koe ya kassai nante hoshiku wa nai sa…Hero dakara hitoshirezu aku to tatakau~” and mentally adds ‘Nobody knows who he is. Story of my life’.
He feels a tad bit self-conscious with Genos being within hearing range, but ultimately he stops caring if the cyborg listens in or not. Genos wouldn’t mind even if his singing voice sucked. At least he hoped he wouldn’t.
Finally done with the food after adding the last ingredient, cream, Saitama puts the lid on the saucepan and looks at the clock on the wall.
“40 minutes to simmer, then it’s ready Gen-ooosshh!,” Saitama turns and jumps as he sees Genos had silently made his way just behind him. “Geez, don’t scare me like that, I didn’t hear you move and I almost hit you with this,” Saitama admonishes him, pointing his ladle at Genos for emphasis. “Usually you’re a lot louder.”
“My apologies, sensei,” Genos says but does not look much sorry at all. In fact, the cyborg is smiling slightly. “I simply came here to check your progress on the making of stew. 40 minutes is plenty of time to perform other activities I have in mind in the meantime without compromising the food.”
“What other activities—” Saitama asks in confusion but is partly silenced when Genos presses his soft, synthetic lips to his in a deep kiss, letting up after a few seconds. “Oh, that kind of…hehe.” A bubble of laughter escapes his mouth.
“If you’re willing,” Genos states and stares at Saitama with his intense golden gaze, hungry for more.
“You don’t even need to ask, anybody would get weak knees by getting kissed by a hottie like you,” Saitama grins.
“Does my presence make your knees weak, Saitama-sensei?” Genos asks in a huskier tone and his arms snake around Saitama, pulling him closer, chest to chest so Saitama can feel Genos’ underlying hard metal alloy through his sleeveless, black shirt.
Saitama doesn’t resist Genos’ advances and lets himself get maneuvered in front of the fridge door for more space, Genos’ arms circled behind his lower back. “Euhm, maybe…depends on what you’re doing.”
Genos attacks his neck with his mouth, making a line of wet saliva on his jugular. “I want to make you orgasm so hard you see stars, sensei,” he continues the line of licking behind Saitama’s ear and whispers seductively and without any shame, ”I want to make the world’s strongest man in the world tremble with pleasure, so much that you can’t stand upright anymore.”
Saitama blushes from head to toe, breath hitching when Genos slowly licks his earlobe and gives it a nip. Genos probably got off on the power trip. This close, Saitama could scent the slight tinge of motor oil Genos uses to lubricate his joints and it makes intense ardor shoot up his being instead of the opposite.
“Yeah, yea, give it your best shot,” Saitama answers back challengingly. “Let’s see what the disciple can do. You’ll also keep me updated on the food timer yea?”
Genos yells an enthused “Yes, sensei!”
The cyborg takes to the assignment with relish and puts his hands under Saitama’s hoodie, making the strong hero flinch and bemoan “cold” as Genos’ hands travel up his stomach and defined abs. His target is two nipples which bud right away as he begins to twiddle them with his fingers. Saitama moans and lifts his hoodie out of the way so Genos can have better access to his weak zone. Genos has already mapped out all of his erogenous zones, so Saitama is not all that surprised that the younger male would start playing with his nipples first.
Genos leans in and starts to eagerly suckle on the left nipple, continuing his ministrations on the right nipple and Saitama sighs in contentment and leans against the fridge door, petting Genos’ blonde hair with his fingers.
“That feels good, yeah…” Saitama always liked when Genos toys with his nips and he puffs out his chest when Genos laps around his areola and rolls his pecks in his hands. He does not see stars yet but he’s definitely turned on, starting to feel warm in places where Genos touches and hot under the collar. Genos’ cold hands have since warmed up, but Saitama heavily suspects Genos surreptitiously used his built in arm blasters to heat up his hands just slightly to normal skin temperature.
Genos’ hands travel down and inside Saitama’s pants to grab at his ass, kneading his leg between Saitama’s legs conspicuously against his growing hardon, infuriating smirk plastered on his face as he looks at Saitama’s reaction.
“Saitama-sensei, I’ve taken the liberty of asking Doctor Kuseno for upgrades concerning our sex life,” Genos says it so casually Saitama almost misses the entire gist of it, between Genos frustratingly kneeing his groin with his leg and sucking on his nipple.
“Wait what?” Saitama says, completely flummoxed. “That’s…how can you ask something so embarrassing of him?” Saitama wants to crawl under the entire Hero Association Headquarters and perish. It’s a small miracle the information didn’t wither his prominent erection then and there.
“It was necessary for me to ensure I’m at my best when it comes to intercourse with you, sensei,” Genos states matter-of-factly, not stopping grinding his leg against Saitama’s groin.
“That almost sounds romantic when you put it like that,” Saitama comments lamely, then sighs low as Genos nips at his nipple.
“Regardless, I have a question for you. Will you permit me to use a mild aphrodisiac to make you feel good, sensei?” Genos queries.
Saitama squints. “It’s nothing dangerous, is it?”
“Doctor Kuseno procured me a substance that can be mixed with my saliva and it’s entirely harmless, if a bit overpowering of the senses,” Genos explains. “It completely wears off in an hour on its own.”
“I guess…go for it and let me decide if it feels good ok?”
“Yes, sensei, I shall.”
Genos wastes no time attaching his mouth to Saitama’s nipple again and this time, Saitama starts to feel a tingle and he moans. Genos lathers up Saitama’s other nipple in a similar way and goes down to his abs, saliva-like lubrication running freely down his mouth to Saitama’s rock-hard muscles. He rubs Saitama’s abs and hip bones for good measure, spreading saliva everywhere.
“It’s tingly… but it feels…warm and good,” Saitama muses and shivers in pleasure. Genos sure got the best ideas, even if it’s embarrassing to know his doctor has insider knowledge of their sex life now. He forcibly pushes the old man out of his mind and focuses on Genos and the extra sensitive skin where Genos’ saliva has been applied to. His nipples and stomach tingle pleasantly and he feels hot all over, courtesy to Genos’ ministrations which he did with aplomb.
Genos takes this pause to gently nip and tweak at Saitama’s tender nipples and Saitama yelps, which peters into a loud moan as his slightly abused nipples spike him with pleasure.
“Genos, haah, you…mmm…you sure know how to make a dude feel good, huh?” Saitama’s tone is a husky growl as he challenges Genos to do more and really bring him down to his knees like intended. Genos looks up with half-lidded eyes and rises up, meeting Saitama’s eyes.
“Only the best for you, sensei,” he smirks and re-attaches his mouth to Saitama’s neck, licking his way up to his earlobe, behind it and again nipping at his ear, inducing another shiver from Saitama as his skin is now doubly sensitive to touch. He whispers, “Your pleasure is all mine.”
Genos’ fingers trail up and down his jugular and undoubtedly he can gauge his sped up pulse from touch alone and Saitama moans at the tingly, teasing sensation of the slight pressure gliding along his skin. Genos bites at the skin of his neck and Saitama mewls and gives him more access to suck and abuse the succulent skin to his heart's content. Then Genos moves lower again, to roll his nipples between his fingers and licks at the sensitive, tingly buds until they’re as hard as his raging erection. Saitama gasps and moans salaciously each time Genos licks and sucks on the nipples and areola, the aphrodisiac effect on the cyborg’s saliva working wonders. He’s very turned on by this.
Saitama’s abdomen does not escape Genos’ attention as he kneels lower and licks and kisses his abs, making the muscles within twitch involuntarily. His metal fingers tug at his pants, ghosting Saitama’s hip bones with feather-light touches and Saitama grabs at his hoodie hem harder and tries not to lean too much against the fridge door, afraid of accidentally breaking it.
Genos suddenly goes down at groin level, swiftly pulling both of Saitama’s sweatpants and underwear down, patience seemingly forgotten. His new price, Saitama’s hard cock, lies directly in front of him free of restraints. He wastes no time taking the entirety of Saitama’s dick in his mouth and slicks the entire length with his aphrodisiac mixed saliva, making Saitama gasp out loud.
Saitama can’t begin to describe how good it feels on his cock when it tingles, being far more sensitive than normal and to have Genos’ excellent mouth on him at the same time. It’s almost too much and not enough because of his high stamina and he swears up a storm when Genos swirls his tongue on the sensitive crown, making his legs weak. The pure pleasure on his groin is simply an amazing feeling.
“Fuck- ah, Genos, aah…so good…” Saitama moans and thrusts his hips forward, forcing Genos to take more of his cock in his mouth and Genos answers with a full on deep throat and suction while simultaneously rolling his balls in his hands, which makes Saitama’s breath catch and he lets go of his hoodie, draping his hands on top of Genos’ head encouragingly. “Shit Genos, your mouth feels so good…” he inhales and exhales as Genos continues to suck him.
Genos swirls his tongue around the underside of Saitama’s cock while still sucking him off, somehow, and it feels incredible. ‘Genos is incredible’, Saitama thinks while moaning loudly.
He already feels like he’s about to come and it hasn’t even been that long. Genos expertly twirls his tongue on the head of his length, alternating sucking deeply, not forgetting to knead his balls and for sure he’s very close to coming right now.
“Genos, I’m gonna- ooh…”
At that, Genos suddenly stops and lifts his mouth away from his prize and holds his cock tightly at the base, leaving Saitama standing and trembling in want, his need to cum receding just slightly.
“Genos…?” Saitama questions weakly.
“It is not enough, I need to do more, Saitama-sensei,” Genos simply replies, then takes one of Saitama’s balls in his mouth and palms the other, rolling it with his hand and then discards it and takes the other in his mouth as well, giving it a good lathering with his saliva that makes everything tingle warmly. Saitama can’t do much but lean against the fridge door, spreading his legs invitingly as Genos goes lower and laps at his perineum too and teasingly slides two fingers around there, making Saitama’s hard cock twitch in interest. Genos has been so thorough in his licking job that Saitama feels like a large, spicy lollypop, his erogenous zones tingling pleasantly.
Genos moves back up, avoiding his aching cock and teasingly licks Saitama’s hip bones, making the older man involuntarily twitch and try to squirm away from the ticklish contact but Genos’ iron grip on his sides does not let him move away without using force, so he resorts to holding Genos’ shoulders. Blast the cyborg and his wicked ways, he knows exactly how to get him going.
Genos rises back up to his feet, meeting Saitama’s eyes with his sharp gaze as he licks his hand to re-lubricate it and afterwards takes Saitama’s cock in his hand, giving it a good squeeze and starts to pump in a slow, teasing rhythm. Saitama clenches his hands and tries his hardest not to dent Genos’ shoulders. He’s feverish, sensitive and tingly all over and Genos shows no signs of letting up his teasing because the younger man seemingly has something to prove.
“Genos, Genos, please…” He chants and leans hard against the fridge door, breathing heavily, feeling like a dam ready to burst.
Genos takes the opportunity to kiss him passionately, tongue on tongue action and Saitama feels even his tongue tingles a bit from Genos’ aphrodisiac concoction, never mind his lips. Genos thumbs his cockhead and slowly but surely, ups the pace in which his hand pumps Saitama’s aching cock. Saitama thrusts into the tunnel of Genos’ hand, which feels heavenly good with the lubrication from Genos’ synthetic saliva.
“Genos, AAH! Genos, please!” Saitama begs and hides behind his hands, almost coming then and there when Genos gives his cock a good squeeze and a pump. Then Genos does something unexpected and the hand on his cock starts vibrating, moving around his length wildly and that does it for Saitama, who comes hard with a yell and would have collapsed onto his knees if not for Genos’ quick thinking of catching and steadying him. Neither minds Saitama’s spunk messily hitting Genos’ legs and the opposite cupboard door.
“Haah…” Saitama breathes hard, “that really made my knees weak…” he moans in the afterglow of his powerful orgasm.
“As promised, sensei. But we’re not done yet,” Genos says as his irises shift into analysis mode.
Saitama’s pleasure-addled haze in his mind makes him almost miss the sentence. “We’re not?”
“My sensors indicate you still haven’t ejaculated hard enough that you’d see stars in your vision, Saitama-sensei.” There is a glint in Genos’ eyes that Saitama can only place as being ‘horny’.
“Ah, that…I don’t think I can get that excited so soon after- hey!” Saitama yelps as Genos grabs him from behind his buttocks and lifts him in the air.
“Genos, the stew—”
“Can wait.”
The succinct reply makes Saitama shut his mouth fast.
Genos surveys the kitchen, then with Saitama in tow, marches directly to the small round table in the sparse living room space, one of the few furniture items Saitama’s new apartment could fit and places Saitama lying down on top of it. Saitama’s pants dangle awkwardly on his shins which Genos promptly removes and tosses aside, then does the same to his heart-shaped underwear.
Saitama looks at his new situation critically, naked legs bent at the knees towards his belly by Genos holding him from below the knees. His face takes on a more serious visage. “Don’t break the table then, you hear Genos? This was a good thrift store find and I rather like it.”
“I won’t,” Genos acquiesces.
“Good. Now, you got something else in mind. What is it?”
Genos smirks. “This.”
He promptly lifts up a finger and sucks on it, drowning it on his saliva-aphrodisiac combination, then starts to insert it on Saitama’s asshole. Saitama at first clenches and then relaxes when Genos encouragingly twirls his finger around his hole, seeking entrance. Genos plunges in one finger, slowly stretching him out and lubricating his rectum, seeking the sweet spot that he knows is inside.
Saitama thinks it still feels a bit weird to have Genos’ finger inside of him, but usually the payoff is pretty good from Genos fingering him during anal sex. Already he can feel the saliva work its magic on him and he feels slight tingling all over his hole. Genos quickly preps another finger and inserts both, stretching him out even more, pushing deeper and deeper.
“There,” Genos says triumphantly and Saitama bucks and moans involuntarily, Genos having found his prostate and nudging it tantalizingly. Genos takes his sweet time lathering up Saitama’s insides with copious amounts of lubricant, teasing the bundle of nerves in a way that makes Saitama’s previously flaccid cock rise up and making the hero moan and twitch.
“Aah, you sure know how to treat a guy to a good time, dont’cha Genos?” Saitama quips with a groan petering into a moan as Genos more insistently rubs his prostate, while his other hand makes sure to slowly twirl around his dick teasingly, twisting and turning his hand. Saitama clenches the bottom rim of his hoodie, desperate for something to do with his hands so he doesn’t accidentally hammer the table to pieces by trashing around.
“I’ve done research,” Genos answers from between Saitama’s legs. “Which is why I asked Doctor Kuseno to custom build me this upgrade,” he says and holds a hand up, transforming his middle finger into—
“Is…is that a dildo?” Saitama stares at the apparatus that came out of Genos’ hand which looks like a steely dildo with a smooth and black rubber tip, no thicker than two fingers and approximately hand-length, though Saitama is certain it could become even longer or thicker on command.
“This is a vibrator that I can control. Doctor Kuseno needed more time to produce an actual working set of genitals for me to use, so this is the next best solution.”
Saitama hides his red-hot face beneath his hands. “You seriously went and asked the old man doc for a finger vibrator? That’s so- ugh…”
Genos frowns. “You don’t like it, sensei?”
“NO, no…” Saitama says empathically, “I mean, I like it, I’m just having second-hand embarrassment because you’re incapable of feeling any shame.”
Genos looks unfazed. “Alright. You should prepare yourself, sensei,” Genos says seriously and lathers up his vibrating finger properly, before inserting it inside Saitama’s hole. It fits snugly inside and Genos pushes deep until he finds Saitama’s prostate again and begins the vibrating function. Saitama arches his back at the feeling, his sweet spot sensations amplified by the aphrodisiac’s effects as Genos insistently bumps against his bundle of nerves over and over again. He moans and squirms at the contact each time the cyborg fingers him deeply. Genos’ other hand takes his hardened cock in hand and starts moving, making Saitama unsure about which direction he should move into to get maximum pleasure. Every part of his body feels hot and tingly and so, so sensitive it makes his toes curl. Saitama feels like every part of him is pleasantly fired up.
Saitama can’t help but writhe and twitch every time Genos hits his prostate and eventually, Genos simply holds the whirring vibrator directly onto his sweet spot, making Saitama moan loudly because Genos is making him come again then and there.
“Ghh, Genos Genos Genos, I’m so close—”
Genos’ vibrating finger suddenly slows down and he removes his finger entirely and takes hold of the base of Saitama’s cock to impede his coming, making the older hero groan in disappointment.
“Genooosss…” Saitama whines. He’s flushed from head to toe and teetering on the edge of coming, one which Genos denied him yet again.
“Not yet, sensei. Just a little bit longer, I assure you,” Genos reassures him.
After a small break, Genos takes Saitama’s cock into his mouth again, slowly swirling the crown with his slick tongue and Saitama bucks into that sinfully good mouth. Genos slathers his dick with copious amounts of saliva as he sucks and plays around it with his tongue tantalizingly, making Saitama squirm at the heightened sensations of it. He’s so close and yet so far if Genos is asked about it. But he has to admit he’s thoroughly enjoying himself regardless because Genos really knows what he’s doing and he’s almost afraid to ask where Genos got the skill and knowledge. Maybe Genos just learned his body that quickly after just a few times of doing the deed, but he suspects internet porn sites were the culprit rather.
His mind hits a blank when Genos deepthroats him again and slurps on him like a vacuum and he can’t help but grab a fistful of Genos’ hair and nudge him down and upwards in a rhythm that Genos immediately obliges to, making Saitama breathe hard. Genos takes this opportunity to once again reinsert his finger-vibrator into Saitama’s anus and precisely finds his prostate, beginning the vibrating function that makes Saitama tremble and push Genos’ head down to the base of his dick, hard. Genos never even gags at anything, Saitama has found before, making things like deepthroating a child’s play to the cyborg.
Saitama humps and trembles into Genos’ eager mouth and tries his best to keep the shaking vibrator hitting his bundle of nerves, but he’s so tingly and sensitive all over it’s hard to stay perfectly still and let Genos do what he does best; pleasuring Saitama ‘till he cannot move anymore. He lustfully proclaims his pleasure and how well Genos is taking care of him instead to encourage the younger man to do what he wills. Genos answers by pressing his finger-vibrator harder against his sweet spot.
In no time at all Saitama crests, bucking hard and spilling his seeds into Genos’ awaiting mouth with a mighty yell, dots dancing on his vision and the cyborg sucks down every last drop greedily, slowly pulling the vibrator outside Saitama’s hole once he groans in oversensitivity.
“Haah…I actually saw stars…you’re amazing, you know that right Genos?” Saitama pants, body tingling pleasantly in the afterglow.
Genos smiles genuinely. “Thank you, Saitama-sensei.” Then his smile turns smug. “Mission accomplished.”
“I take it back, you’re a little shit—”
Suddenly Saitama finds himself askew on the table and he slips, noticing one of the table legs gave away under his weight.
“Oh crap, there goes my table,” Saitama grouses.
“I can fix it,” Genos suggests.
“Yea you need to, cuz this is kinda your fault anyway. You wanted to do me on the table.”
“Understood, sensei.”
“What’s the food timer?”
“6 minutes until 40 minutes in total has elapsed.”
“Hmm…you fix the table, I’ll fix us food, ok?”
“Yes, sensei!”