Chapter Text
Alcohol poured down throats, sloppy dancing around the speaker, and here Deku sat, watching it all unfold. He didn't mind being outside of the party; he was never that loud, to begin with. He liked seeing his friends cause a ruckus; it made him happy to see them happy, especially when he knew he didn't cause it, so he would have no feeling of pressure to keep that momentum up.
Izuku sipped his drink, some cooler that Denki threw at him, explaining that "it's like sugar in a cup that'll make you drunk!" or something of the sort. It didn't matter too much; Izuku just liked having something to keep his awkward hands busy. He smiled, enjoying how Mina and Denki danced, or well, instead, Mina danced, and Denki swayed drunkenly around her. He let off little sparks, but nothing that alerted the group to do anything more.
He watched fondly as Uraraka texted her girlfriend, seeming to tune the world out as she sent selfies with reckless abandon. He knew they had suffered, what with the war, the almost dying, the basically dying, and then the whole her going to juvie for the long list of crimes she had committed. Uraraka kept her promise of keeping in touch, though. She was a good person.
That left Izuku with his thoughts. He would have almost died on many occasions if it weren't for Katsuki, who had nearly died and then very, very literally died for him. Katsuki was his saviour on many fronts, and he would like to say it's romantic. Still, in reality, it was due to him being All Might's successor, and maybe more primal, Katsuki's instincts were aware of Izuku's status.
He was an omega, not that it mattered. He never presented any fundamental features of one. Sure, he had a bum, but it was most likely from all his training and use of his shoot style. Sure, he had pudgy cheeks, but so did his mother. She and he had the exact same face, aside from his freckles. Yes, he was short, but big deal, genetics didn't matter very much. He did just fine being short. He just happened to be an omega with the tiniest of heats, which meant he only left school one day a month and didn't care about scents. None did anything to him aside from Katsuki.
Ah, Katsuki. He could see him speaking to Jirou and Momo. Seemingly the three of them were tipsy. He could smell from the distance that Katsuki was in a good mood, and with the wolfish grin he wore, his inhibitions were lacking. Katsuki looked over a few times, but Izuku always whipped his head in another direction, hoping Katsuki would play along and pretend he missed Izuku staring.
"You alright, Mido?" A voice alerted him; next to him was another tall, boisterous man, one with red hair with black starting to peak through the roots. Kirishima sat next to Deku, taking up a tremendous amount of shape; he was assumed to be an alpha. He hadn't turned 18 yet, so his secondary gender was still unknown, but in some cases was easy to guess.
"Oh, yes, I'm fine, Kirishima. I just enjoyed seeing everyone else have fun. I like being alone, so don't feel you're forced to be with me. I promise I'll be okay." Midoriya's head tilted to the side, a smile on his face, warm, inviting.
Kirishima leaned in to sniff; even though he was still uncategorized, he tried to smell Midoriya. The boy was seen as relatively pretty; if his features meant anything, he would be someone's beautiful omega bride. Izuku could dream, at least, that maybe he'd be someone's lover in the future, but it wasn't easy when he only had eyes for Katsuki.
"Mido, I don't feel forced, we should get to know each other better, and a few drinks on the balcony, just the two of us, should do the trick! We should be buddies since Kats n I am best buds, and you n him are too! We can be the three amigos!" Kirishima pulled Izuku up by his arm, grabbing a bottle called 'Pink Whitney,' which looked strong, so they had something to drink while alone on the balcony.
Izuku looked to Katsuki, hoping for a silent rescue, but this time, he knew the blonde didn't spare a glance his way. He finally accepted he was alone with the redhead when said man closed the door to the party downstairs. Izuku sat against the rails, trying to brace himself for one-on-one social interactions.
"So... Mido... you and I don't spend much time together, so let's erm, oh! 21 Questions. If you don't answer, you gotta drink. Now! Are you ready?" His sharp grin shone from the lights illuminating the pavement outside. Izuku gulped, realizing he was royally screwed.
"I, yeah, okay." He sighed, resigning himself to the night he was now forced into. He would much rather have awkward glances back and forth with Katsuki, but getting wasted with Kirishima seemed to be the way the night was heading. He may as well accept it.
"Okie smokie baby! Are you an omega? You look and smell like one." He started, his lids drooping as he stared at Izuku, watching him like prey. Izuku's breath was shaky as he grabbed the bottle of vodka and took a swig, informing Kirishima what he already knew without saying it.
"I- well, uhh, w-what made you decide to become friends with Kacchan?" Izuku weakly asked, trying not to wimp out even though he struggled with his throat burning.
Kirishima shrugged, looking somewhat off-put by the question. "He seemed cool, strong. I wanted him around, a great addition to a pack, ya know? Now, back to you. You think you want to get into hero work or get married first?" Kirishima moved closer, only two feet away from Izuku, the two sitting facing each other as the game continued.
Izuku leaned away from Kirishima, his palms starting to sweat. "Pr-probably never getting married, I uh, I don't think I would- no, I know I'm not eye-catching." He mumbled, his cheeks puffing pink, opting to take another chug of the vodka, feeling embarrassed at the sudden lack of filter he had. "Oh! Um- are- are you going to work with Fat Gum after you graduate K-Kiri-Kirishim-ma?" He stuttered as Kirishima closed the gap, only a foot away from him now.
"You sure don't like to ask saucy questions, but we'll get there. If none of us start one, I go with FatGum. Now, will you find a cute boyfriend before you go pro?" Kirishima licked his teeth, watching Izuku with a look in his eyes that made Izuku shudder. He looked at Kirishima, an intense glare forming.
"Kirishima, I don't want to assume, but I think you're flirting with me. I think you're handsome, but I like someone else; I'm sorry."
Kirishima pouted, his hands going to Izuku's knees. "I hear you, but hey, what about one night, you and me, and then you and I can be compadres, amigos, buds, pals, ya know?" Izuku could feel his scent souring. He began pumping that sour scent that told others to leave him alone. He wasn't sure what he was hoping for, knowing Kirishima was only showing the beginning traits of an alpha.
'Who does he think he is? He's no Kacchan for sure, brave to keep pushing, but there's no comparison."
"Why do you smell like that? I- I can comfort you, yeah... Yeah, I can fix that rotten smell..." Kirishima began to lean in, missing the way the door swung open behind him.
"Hands. Off. My. Omega." The low growl of Katsuki filled the space, catching the two off guard. He stalked up behind Kirishima, grabbing his collar, throwing him back, and letting him hit the floor. Izuku stared up at the blonde, confused, unsure how he knew where he was or why he was so upset. Maybe he was smelling my discomfort? Kacchan is amazing. He would rescue me from anything-No, wishful thinking. He probably thought I smelt nasty and needed me to stop it.
"K-Kacchan, I- sorry for bothering you!" Izuku stumbled through his words as Katsuki pulled him through the party, not stopping when looks occurred. Izuku opted to say nothing, letting the blonde pull him to his den, his scent continuing to tell Izuku how irate he was.
Izuku stumbled through the door of Katsuki's room, letting himself be thrown into the plush bed. He watched Kacchan pace the room, his path lining the bed.
"Kacchan?" Izuku spoke, soft, confused, but the blonde's body stopped quickly.
"No, no Kacchan, no Katsuki, and no Bakugou." He growled, seeming annoyed by his own name.
Izuku gulped shakily, beginning to realize what was occurring. "U-Um, so you don't like those names? What do I call you?" Izuku remembered what he had heard: when a prime becomes too disconnected from their instincts, their secondary demands control and acts primally. If Izuku was correct, this wasn't Kacchan per se, but rather his instincts lashing out from the lack of congruence.
Katsuki rushed into the bed, his body pinning Izuku down, his nose nuzzling into Izuku's cheek. "Alpha- wanna be your alpha? No, I am your alpha." He whined, and it was cute, which surprised Izuku.
"Alpha, right, but uhm, why are you so disconnected? You seem so assured, or at least Kacchan does." Izuku began petting Katsuki's head, scratching his scalp when he heard little purrs. Katsuki nuzzled deep into Izuku's neck, practically vibrating with how hard his purrs became. Clearly, it was his primal gender speaking, acting, in command. Izuku would have been concerned, seeing that this would usually result in violence, but Katsuki's primal alpha snuggled him like a cat who had missed you while you were away.
"Disconnected " because Katsuki wants to be number one and make an agency before he mates. Alpha wants Izuku." He grinned dumbly, eyes hazy as he stared up at Izuku. Izuku's lip wobbled, feeling moved. "Katsuki thinks only about hero progress, thinks Izu doesn't want him; Izu wants though, right?" His puppy dog eyes peered up at Izuku, making the boy shiver.
"Okay, I- I do, but you're sure that Katsuki and you want me? Truly?" He was met with furious nods and a slight pout, almost seeming hurt by the idea that he /didn't/ want him. "Then- Okay, shoot. We-Well, I am an omega, and to be a hero as an omega is hard, right? I could live easier this way... You know, so- so if you're sure, absolutely sure that you want me, then- then tonight you can have me because I- I want this too, dammit!"
Katsuki grinned, his fangs elongated, forced outside his mouth with the size of them. Kissing up Izuku's neck to his jaw, then landing on his lips, it was clear what he wanted with Izuku, and Izuku was happy to oblige.
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"Ca- ahh - can't go again, alphaaa!" Izuku whined, his body jolting after the second wave of an orgasm. Katsuki had his mouth around Izuku's dick, fingers pressing inside the omega, prepping him. Two fingers in, and Izuku was mewling from stimulation.
"Such a good omega; I love how you look, how you sound, fuck- how you smell." He growled around Izuku's member, fingers speeding up so he could rip more of those sweet whimpers out of his mate. Izuku's back arched gracefully off the bed, making a perfect bend, his strenuous workouts coming in handy. Katsuki salivated from all the rippling muscles on display.
Izuku had cum once from Katuski's mouth, the second was moments ago when fingers were introduced, but the alpha wanted-needed to have his mate a puddle when he was done with him. Izuku was shivering, already spent, but knowing by Katsuki's actions; he was nowhere near done with him. Inside, Izuku hoped this would be a long night for them, lest his mind keep up with it all.
"Izu, think you're ready? You feel all soft and wet, fuck are you ever wet." Katsuki let Izuku's poor, twitching dick go, moving his lips to kiss around the sensitive skin suckling his fingers. Izuku kept pushing him further on edge with his tiny whimpers and pleads for more, the tiny praises making Katsuki almost pop his knot alone. Katsuki licked around his fingers, his fangs producing a claiming venom from how delicious his omega's slick was.
"Want it, Kacchan, want it alpha. I'm nice and /stretched/, so get on with it." He huffed out shakily, trying to show desire, but it came out more bratty.
Katsuki pulled his fingers out with little remorse as Izuku whined from the sudden emptiness. He liked the way it made the greenette's hole pucker from doing it so fast. He sat up to his knees, flipping Izuku onto his stomach. Izuku squeaked at the sudden change of position but adjusted nonetheless. Izuku shimmied up so his back had a lovely arch, a presentation for the young alpha to feast upon. The gasp from behind Izuku made the omega purr, satisfied by the knowledge he had the alpha's full attention.
"Oh, you know how to put on a show, don't you, Izu?" He snickered, lining himself up to Izuku's wet, dripping entrance, the pucker enticing him. He ran the head across the hole, letting it almost slip in but then missing, enjoying the little whines and groans Izuku made when he almost got what he wanted. Continuing to slip it over the sensitive skin teasingly, he let Izuku's thighs become drenched with his own slick, making obscene sounds with every swipe. Izuku hissed, startling Katsuki before his cock was gripped at the base by the cute omega's hand.
"If you don't /fuck/ me right now, I won't hesitate to take it myself. Don't make me repeat myself, /Katsuki/." His green eyes pointed over his shoulder, boring into red ones. He let a small, omegan growl out, showing how serious he was about the task. His ass wiggled back, trying to push Katsuki's dick in himself when it was shoved in on one go by the sneaky blonde alpha.
Izuku gasped before producing the most wanton moan, heady enough to make anyone within earshot harden. He grabbed Izuku's waist, letting his fingers curl around it. Izuku kept producing slutty groans, guttural. Izuku's fingers gripped the sheets, almost ripping them with the sheer force he held them. He bit into Katsuki's pillow, drool puddling under his chin. His eyes began to roll back as he took the sexual beating of his life. The bedframe began indenting the wall with the force of Katsuki's slamming. Izuku was pushed further into the bed as Katsuki towered over him, ensuring every inch found refuge inside his tight body. Izuku was being moulded purely for Katsuki's pleasure.
Izuku could only make sounds, attempting to say Katsuki or alpha at times, other times pleading for more or praising how good it was, but words fell flat with how slack his jaw was. His mind was numbing, he had cum at least once more, but he couldn't tell Katsuki if he wanted to, overstimulated from the prostrate beating.
"Keep cumming, pillow princess, but I ain't stopping til this knot pops." He snickered as Izuku whined, his body shivering; who knew if it was from the constant press against his prostrate or the threat of not stopping, regardless of his waves of cum. If the alpha had any say, Izuku would surely be a crying, snivelling mess by the end.
Katsuki's grunts filled the room, his hips making 'thwaps' as he made contact with Izuku's perky ass. The 'Schlick' from Izuku's slick makes them slide against each other. Katsuki continued to pump into the one beneath him, eating up the pants and shivers beneath him. "Such a perfect omega, no one better for me." He growled lowly.
Katsuki sucked his teeth, glaring at the sickly sweet scent gland on the back of Izuku's neck as he continued his assault on the boy's ass, his fingers leaving bruising indents on Izuku's slender waist. He would have bruises in the morning and couldn't wait to see it. Izuku loved the pain and pleasure, enjoying how it made his gut twist. He began pushing his hips back, meeting the thrusts as if trying to take control, topping from the bottom. Katsuki hissed, feeling his knot threatening to pop with each slap.
"Fuck, omega, my omega, if you keep that up, I'm claiming you. I'm pupping you. God, I want you filled." He groused, licking Izuku's scent gland with a broad tongue stroke. Izuku lowered his head in submission, making Katsuki whimper. "Do-don't do that; I'll take you here n now. You- you don't want that."
Izuku's neck stayed bared; his misty jade eyes looked over his shoulder at Katsuki. He tried to speak, semi-slurred. "Want knot... want alpha... give..." His hand made grabby motions, trying to reach for Katsuki, hand making purchase of his thigh and using some of one for all to force the blonde closer.
Katsuki growled lowly, his nails boring into Izuku, red angry marks dawn his skin. Izuku groaned, loving every minute of it. "Knot, knot me now, claim me now!" He cried, his face streaked with tears and drool, neck now dewy from how much energy they had both exerted. Katsuki slammed down; every inch of himself was sucked into Izuku, his knot now full and deep in Izuku. Izuku's tummy protruded with each gush of cum that Katsuki poured in.
"My Omega, mine, mine forever-"
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