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The way it was explained when Mista was in sex ed was like this,
You have guys and girls, and then you have the secondary sex trait of Alpha, Beta, or Omega. People tend to be betas-- around three quarters of the population is beta. But the last quarter is split pretty evenly between alphas and omegas. Guys tend to be alphas, girls tend to be omegas, but since nature doesn’t always give a damn about human social constructs like gender conformity guys can also be omegas and visa versa.
It isn’t entirely uncommon, just a little rare. When babies are made, the secondary sex chromosome tends to just stay with its match, but sometimes they get switched. It is all a part of nature. The teacher went on to explain about alpha women with enlarged clitorises and most of the class tuned out, embarrassed like most prepubescent kids would be when learning about sex.
When you reach roughly sixteen or eighteen, you go through a sort of second puberty where your now obvious traits blossom forward. Anyone who doesn’t have this second puberty is a beta. But guys and girls who do tend to have a shitshow of a metamorphosis. You’ll feel hot, you’ll feel horny, and you have your first heat or rut. It’s like how people with vaginas have their period once a month, alphas and omegas have their own cycle. This is when Mista lost his interest in class and just started doodling penises on his desk.
Mista is an alpha, of course. He started having his ruts when he was sixteen, right before he joined Passione. He remembers waking up with a boner that wouldn’t quit and spending most of the week in his house with the AC running full blast and jerking it to various magazines full of hot and ready omegas. Now he’s older and matured and knows how to deal with his twice annual bonerfest. He locks himself in his room and jerks it to more refined magazines full of hot and ready omegas.
He absolutely does not think about fucking his boss.
Giorno is his boss. The beautiful blonde boy rose to the top of Passione so easily. He's everything Mista thinks of when thinking about leadership. He's sure, smart, capable, and brave. Thinking about him releases butterflies into his chest and he wants nothing more than to just hold him close. To hold Giorno to his chest, smell his cologne mixing into his natural scent, sweet and citrusy, and every time Mista happens to get close enough it makes his head spin. Giorno is an omega. A very powerful omega that has used his power to have men killed and Mista is absolutely terrified and in love.
Giorno is eighteen now and Mista serves as his consigliere. He’s proud of his boss. To see Giorno achieve his dream of being a gangster and clean Napoli of its drug trade makes Mista happy he trusted the boy when they first met. It’s embarrassing, however, that Mista nearly gets a boner whenever Giorno is in the same room.
Mista has lost track of how long he has had this sort of reaction to the omega’s presence but he’s pretty sure it was when Giorno healed him in Venezia. Having Giorno hovering over him, his soft hands gliding over his wounds. The overwhelming sweet scent that was suddenly driving Mista bonkers even though he hardly noticed it before. It’s like something clicked and Mista has spent the last three years thinking of what it would be like to have Giorno all to himself.
He knows Giorno would absolutely kick his ass if he ever found out about how he sometimes thinks of him. He’s never been with an omega boy before. He sometimes wonders if it’s like in the pornos, if omega boys actually do lubricate or if it's possible to get an omega boy pregnant. To have Gio pinned to his bed, submissive and whining for cock. It’s the only thing Mista can get off to sometimes.
Sometimes Mista sits with him while he’s signing papers and doing boss things, and they talk like they’re having a sleepover. Giorno told him he has never had his heat. He’s always been a little bit of a late bloomer. But since he’s a busy person he says he doesn’t mind that nature is taking its time with him. Giorno takes another sip of coffee and looks at Mista with his cute face and cute smile and Mista has to act like it doesn’t make his heart shoot into his throat.
Giorno has told him all sorts of saucy things about himself, that he likes his alphas tall dark and handsome, maybe with a little bit of body hair. An alpha that can dominate him but still be gentle. One that protects him, one that is smart in battle but still kind of a doofus. Mista has no idea how Giorno feels about him though because he's completely oblivious.
What Mista knows about an omega’s heat is that they’re similar to an alpha’s rut. They get sex crazed, they get a fever sometimes, they wake up a week later with a hangover. He knows that omegas will sometimes choose an alpha partner to take care of their needs while they're horny out if their mind. He doesn’t really think about it when Giorno calls him to his bedroom in the middle of the night.
He tosses on some sweatpants and walks down the hall but when he walks into Giorno’s room he’s hit in the cock with an overbearing smell. It’s Giorno’s smell, citrus and musk, but it’s everywhere and it stops Mista dead in his tracks.
Giorno is sitting at his desk. He has a robe on, and he actually jumped a little when Mista had opened the door. On edge. He’s sitting there bouncing his leg like he’s nervous. His hair is a mess, he’s obviously just woken up and at first Mista thinks he’s had some sort of nightmare and needed his best friend’s company.
“Hey, you alright?”
Giorno looks up at him, embarrassment written on his face as he doesn’t keep eye contact. "Yeah, I'm just…" He visually grimaces at himself. “I think I’m starting my heat.”
And Mista’s face flares up red. “Bo-- G-- What??”
Giorno walks over to him, robe slipping off his shoulders. “When I woke up this morning I thought I was catching a fever. But I haven’t been able to sleep tonight and I--” He’s blushing too, reaching to put his hands on Mista’s chest. He bites his lip.
“Are… Are you ok?” Mista puts his hands protectively around Giorno’s waist.
Giorno avoids looking up at him. “I want you to stay with me this week.” He says, tracing his fingers over Mista’s collarbone. “I know that’s something really intimate to say, but…” He trails off for a moment. “But, I trust you. I want you with me.”
Mista doesn’t know what to do. He keeps opening his mouth thinking to say something, the corners of his lips twitching into some sort of amazed, shocked smile. He blinks and closes his mouth before he starts catching flies.
“Mista, are you okay?”
His voice cracks, “Ye-ah.” He has to think of the words. “I just, I didn’t expect…” He pulls Giorno a little closer and swallows nervously. “You smell nice.” He says dumbly.
He can hear the little puff of laughter from Giorno. “Thank you,” He leans into Mista’s body. “If you don’t want to stay--”
“No! No, no, I do! It’s fine, it’s--” It’s a goddamn miracle. It’s like the stars lined up to bless Mista’s embarrassment of a love life.
Giorno gets on his tiptoes to peck a little kiss onto Mista’s cheek. He whispers, “Lay down with me.”
It makes him weak in the knees. “o-- Okay.”
They end up in the bed. Giorno, already having shed his robe, coaxed Mista out of his pants. They lay there, skin to skin, they can feel each other’s quickened heartbeats. Giorno presses tiny kisses to Mista’s cheeks and lips, straddling his waist. He keeps wiggling.
Mista keeps his hands on Giorno’s hips, not entirely sure what else to do with them. But Giorno keeps a steady friction between them and Mista can’t help the gasps that escape when Giorno touches him. His soft fingers gently brushing up the underside of his cock. Mista keens and Giorno must think is cute or funny to tease him like that because he keeps working him softly, leaving light touches where Mista wants more. But Mista is good, he’s patient.
Giorno takes his time, obviously not in a rush. His heat has hardly taken effect, he isn’t sex crazed yet. But he’s close. He smells musky and sweet, and Mista can feel slick on his lap where Giorno is sitting. He’s hot to the touch, and the more he teases, the more Mista loses himself to what his body wants.
He wants Giorno to lean close to him and whisper the command to fuck him into next week. He wants so badly to fuck into him deep until Giorno can’t take anymore, to knot him and bite him and keep him for himself. Not until Giorno lets him, not yet, he can’t yet.
Giorno hums and brushes Mista’s curls off his forehead. “Are you nervous?” He has that little knowing smile on his face.
Mista nods.
Giorno leans over him, their chests touching. He leaves a little kiss on Mista’s forehead and he speaks like he’s breathless. “I like to imagine us like this. Together during our heats, I want everything you can give me.”
It makes a shiver run up Mista’s spine, and he whines, biting his lip. “I want you.”
“Then take me.” Smoothly, he says it like he’s been waiting.
Mista sits up, pulls Giorno closer by the hips, and kisses him fiercely. He swallows the sultry moan that slipped from Giorno, licking his bottom lip with the tip of his tongue, still nervous. But Giorno accepts him entirely. He trusts him.
Giorno is pushed onto his back, he arches his hips into Mista’s. His eyes are glassy, glazed over in a haze of lust. Mista can’t help himself anymore.
As it turns out, omega guys actually do self-lubricate. Mista doesn’t even have to push that hard to get a single finger into Giorno’s hole. He’s absolutely wet, and he’s so vocal. Giorno grips the sheets of his bed and whines with every thrust and press of Mista’s finger.
A thought suddenly dawns on Mista and he quickly pulls away, blushing all the way from his ears to his shoulders. “Should I use a condom? I can’t get you pregnant like in the pornos, right???” There’s a little bit of fear in his voice.
Giorno looks at him-- with the last bit of sanity he has-- like he’s an idiot. “No? I mean…? At least, I don’t have those parts-- Mista, fuck, just!” He throws his head back into the blankets. “For Heaven’s sake, just fuck me!”
Embarrassed, Mista aligns himself between Gio’s legs and presses the head of his cock into his hole. It nearly makes him see stars as he keeps pushing in. Giorno’s so wet and tight around him, it feels like he’s being pulled in. He bottoms out and Giorno sighs like he’s been holding his breath. Such a cute sound he makes. Mista hardly waits, gripping Giorno’s hips and thrusting in and out a few times.
Giorno’s fists grip the sheets tighter and he whines. Little gasps and moans like he’s embarrassed to be too loud. But Mista tries to start a little bit of a rhythm and his tiny whines get progressively louder.
Mista leans over to kiss him. His thrusts hardly faltering, he melts into Giorno’s lips, moaning.
“Mista,” Giorno gasps into his mouth, little breathless moans slipping uncontrollably. “Keep, Keep going. I want mo-re, be rougher.”
So Mista shifts so he can fuck him deeper, and he fucks him harder until Giorno is openly whining and moaning. His hands wrap around him and he feels Giorno scratching welts into his shoulders while he mumbles incoherent half-thoughts,
“Good, Good-- Mista, yes--aah--”
Mista curls his fingers into Giorno’s hair and pulls his head back so he can kiss his throat. He sucks bruises into his neck and shoulder, teeth close to breaking skin but not quite.
Giorno seizes and moans, “That’s--aa, You’re… So cheeky.”
Mista kisses him innocently like his mouth wasn’t just teasing at the bonding site on his shoulder.
“Keep fucking me, Mista, I’m getting so close,” he’s clinging to him desperately. “Fuck me, knot me.”
“Giorno,” Mista mumbles into the crook of his neck, helpless.
His hips snap against Giorno’s ass, pounding into him like his omega wants. He takes a hand and gently rubs a thumb against the tip of Giorno’s cute little prick, and Giorno yelps and thrusts his hips into it.
He falls apart, moaning and whimpering, “So close, so close, I can feel you-- fuck- please--!”
Mista’s knot grew as he edged closer to orgasm, not even keeping a rhythm anymore, just desperately fucking into Giorno until he can’t anymore, spilling into him with a long, loud groan. Giorno keeps wiggling, thrusting his prick into Mista’s hand until he comes as well with a cute little sob.
Mista is heavy on top of him, and he feels safe and just a little sleepy. But he’s still hard and he wants to keep going. “Mista.”
Mista is wiped at the moment, still dizzy in the high of his orgasm. He answers in a monotone “Hmm?” like he can’t think of words.
Giorno writhed underneath him. “Touch me more.”
“Can’t fuck you if my dick is stuck in you.” Mista weakly pushed himself up so he could see him. Oh God, he’s an angel. Giorno’s breaths came as little huffs, and he looked up at him with the most erotic face. Tiny tears in his eyelashes, lips parted, cheeks pink from exertion and, well, emotion. His hair was like a halo curling around his head, falling over the pillow and sheets like gold leaf.
“Don’t care if you can’t fuck me, just touch me.” He’s always so blunt, like he can’t be embarrassed by the things that he says.
Mista leant back down over him as his arms were tired from the strain. He shuffled around just enough so he could get an arm between them and a hand on Giorno’s prick. The little gasps that he made got progressively louder in Mista’s ear.
Giorno’s legs trembled, weakly squeezing at Mista’s waist. His arms wrap around Mista’s shoulders to keep him close. He wiggled and shunted his hips like he couldn’t control himself. Nearly the polar opposite of his usual all-business personality. So, so cute to see him lose his cool.
Mista felt his knot waning. As Giorno kept fucking wiggling, he found that he could actually pull out. When he did, Giorno let out the most pitiful whine. It nearly made his cock spring directly back into action.
“Don’t-- Mista--” He had to be entirely out of it. “Don’t stop yet.”
Mista kissed his forehead. “Wasn’t planning on it.”
Giorno pulled him closer again, rolling his cock up into Mista’s. “I want you in me.”
“You really are bossy, you know that?” Mista couldn’t help but smile though. He slid back in and Giorno relaxed into the bed, like he was content to just have him inside of him.
He fucked him slower, almost languidly, rubbing him off as well. They kissed deeply, their bodies as close as they can get.
This what it’s really like during an omega’s heat. Not entirely like the magazines. It was surprisingly exhausting. Mista was sure he was going to be sore in the morning. He doesn’t want to think about how sore he will be after a week of constant fucking.
Giorno’s arm weaseled between them so he could touch himself as well. He put his hand over Mista’s and made him jerk a bit quicker.
“Close?”
“Mm,” Giorno sighed. “Close.”
Mista picked up the pace and prayed to God that Giorno only had two rounds in him at the moment.
Giorno huffed and gasped and came again into Mista’s hand and onto their stomachs. Mista pulled out and came between them as well. They were a mess of come and sweat and hormones.
Mista would have to clean them up, but he took a moment to catch his breath. He wonders if he can maybe coax Giorno into a bath tonight but thinks otherwise because it’s just too late into the night and he doesn’t want the hassle. Instead he leaves Giorno to snooze in their bed while he gets a damp washcloth from Giorno’s bathroom.
He cleans himself off and returns to clean Giorno, who whines and resists a lot for someone whose brain isn’t located in their head at the moment. Mista decides the sheets can wait until morning. He leaves the cloth folded on the nightstand and he briefly thinks of sneaking out to the balcony for a smoke. Giorno reaches out to him from the bed though, making little grabby hands and he’s too weak to resist. He climbs back into the bed, pulling the covers over them.
Giorno pulls him close so their bodies fit together and he clings like Mista might leave him. Mista kisses him on the head and tries to sleep a little before Giorno wakes up ready to go again.