It had been two years since Katsuki had claimed Deku. The omega had gotten better. So much better that Bakugou was almost regretting having ever bitten him. The little shit had not only been accepted into UA, but he was also in his class. He wore a collar, specially designed to make sure no alpha claimed him, even if he'd already been claimed by the best alpha there was.

Izuku was strangely screwed up for life. He'd have to live with the fact that no other alpha could touch him if it wasn't Bakugou, but if Katsuki hadn't done what he'd done when he'd done it, Midoriya wouldn't have been able to get into UA, to follow his dream. So, even if he couldn't mate with another alpha, and even if his love life was now totally ruined for everyone else, Deku owed everything to Bakugou. And Katuski loved it.

Luckily, Midoriya took his medicine diligently and Bakugou never felt the pull of his heat call him in. He was sure he'd make himself physically sick if he were to ever touch that omega in any type of sexual context.

He'd always been a strange alpha when it came to omegas. All his life, Katsuki had felt that omegas wouldn't do anything to him. He'd never been interested in them, and rarely felt the attraction caused by their pheromones. That's until he met a certain redheaded someone. Bakugou didn't want to admit it but he felt things when Kirishima was around.

And it seemed like it was mutual for the omega. Which made everything very easy. Katsuki started slow. He scented the other and was even bold enough to mark him with his own scent in front of his friends. Eijirou had almost lost it and had reacted extremely well to the touches, his excitement showing in his trousers as he gasped, moaning about how Bakugou was really manly.

And Kirishima wasn't even a normal omega, which definitely pleased Bakugou. He was strong and determined, like he'd been made for him. He respected Katsuki but took no shit from him, which was incredibly admirable.

It was more complicated than a simple crush, the blond noted. It was more of needing him around to feel safe, to feel well. The scent Kirishima radiated made him feel better, soothed his troubled soul and his wrinkled brow. And he was sure he had a similar effect on the omega.

It turned out it wasn't as easy as Bakugou had anticipated. Mainly because he was prideful and didn't know how to deal with his feelings or use words to express things he thought were obvious. But Kirishima was still always by his side, even when they didn't go past slight teasing and rubbing their scent over the other. It was still a good way to claim him, Katsuki tried to reason with himself.

And then he'd gone and got himself kidnapped, and when he was close to losing hope, Eijirou's hand was in the sky, waiting only for the perfect grip that would match his. Bakugou didn't want to admit he'd been saved, but he had. And thanks to that incident, things got a little weird. They held hands now, and it wasn't strange at all for them to go places together, their hands intertwined.

Sero, a measly beta, was the first one to get tired of it out of the Bakusquad, which come as a surprise to Katsuki. He was sure the first one to voice his awkwardness would have been Pikachu, given the amount of glares he sent their way every day.

"Well, are you official or not?" Plain Face whined after watching them go hand in hand to the cafeteria.

Baugou just answered with a low growl, which was a warning to stay away from the subject.

"I wanna know too!" Mina shrieked, shoving herself in between Katsuki and Kirishima, breaking their hands apart. She was an alpha, too, which obviously didn't sit well with the explosive blond. She was far too close to something that wasn't technically his but had been made to be, sooner or later.

Eijirou blushed, almost the colour of his hair. Bakugou didn't fail to notice how his lips quivered as he tried to come up with an answer. His stupid heart was pounding with emotions he was better off without, thank you very much.

"I don't know, Bakugou, are we?" Kirishima almost whispered, his voice low. The blond frowned, his eyes narrowing. Was this some sort of game? A test? Was he supposed to just say they were? Maybe it was an alpha thirst that the omega had and he had to prove it. But he honestly didn't know what to do.

"Whatever." He growled, as if that was answer enough, and he left, hoping no one had noticed the panic in his voice.

A few steps ahead he was met with Eijirou's hand in his and they shared a warm look that could only mean one thing.

It had happened by accident. They were studying in Bakugou's room and Kirishima was squirming around in his chair, looking uncomfortable. His smell was stronger than usual and Katsuki couldn't help himself, having caught himself leaning in towards the omega, getting closer to his neck than he should be.

Dangerous.

But good.

So good.

Eijirou moved suddenly. Like a twitch. And with the sudden spasm of his body, he let out a moan. One that resonated inside of the alpha, snapping him away from reality. His senses sharpened immediately and he could tell the other boy was hard and leaking.

Was this the effect Bakugou had on Kirishima? Or was the omega simply close to his heat? It didn't matter, Katsuki had to do something, anything, to get him out of those clothes and into his bed.

A closer look at the redhead disclosed that he was panting, his breathing troubled, his mouth open to facilitate the intake of air. His face was nearly the colour of his hair and he was emanating such a sweet smell and a lot of warmth.

The image alone was enough to push the blonde over the edge, and, resting his hands on either side of the other's cheeks, he dove into a kiss.

As their lips crashed together, he felt something he'd never felt before. Sure, he hadn't kissed anyone before, but he was sure this wasn't just a regular kiss. He was sure this went beyond, that this topped everything. The omega's mouth fitted so perfectly into his he was sure he'd been created surely to make him happy. His sharp teeth prodded at his lips and Bakugou let out a moan before opening his entrance and letting Kirishima's tongue inside of him.

It hadn't crossed Katsuki's mind that not only was Eijirou going along with it, but he was also very keen, initiating the movements himself.

Fuck, he'd found the perfect omega.

He didn't need one of those wishy-washy, submissive little shits. He didn't want that. He wanted a strong partner, strong in mind and in will, capable of doing things for themselves, not afraid of going against Bakugou if they had to.

And Kirishima was the one.

He'd gone as far as to save him, what more proof did he need to know this omega was his soul mate.

His fated pair.

Katsuki just had to sink his teeth in and make sure the rest of the world knew that this one was his.

The redhead was not afraid of him, unlike everyone else. He wasn't afraid of telling Bakugou what he was doing wrong or telling him what he wanted. And Katsuki really admired that. He pretended he hated it, but it sat well with him on a level he couldn't understand.

The fact that he'd found an omega to match him made him feel different.

Special.

And they were sharing such an intimate kiss that he was melting into his cute omega. He couldn't let him go, not now, not ever.

The tongue in his mouth grew bolder and Bakugou felt hands on his shoulders, wrapping around his neck and pulling him closer.

He had initiative and was willing to do things to get what he wanted. And right now it seemed that what Kirishima wanted was Katuski. And the blond would kill to give him everything he desired.

He led him to his bed and gently pulled him onto it, not wasting time on pressing himself against him.

Finally they'd gotten somewhere, and it was Heaven. The omega beneath him was panting and moaning, his little touches were like fire, but in a good kind of way. In a way he now knew he couldn't live without.

His kisses were dangerous but good. His sharp teeth posed a threat he was all too glad to assume and he let Kirishima nibble on his sensitive lips, maybe even let him draw blood. In all honesty it felt too good to stop, the heat increasing between them.

Bakugou felt the omega rut against him, his clothed cock hungrily searching for pleasure, blindly following instincts. Oh god. The blond almost felt his brain melt. It was all nearly too much. The smell the other was emanating, which he was rubbing all over the alpha, to make sure other omegas knew who this one belonged to, plus his sharp teeth marking his skin, leaving bite marks and blood as his lips travelled Katsuki's neck were all making the blond feel elated, like never before.

It was time the alpha took over and he pressed his mouth against the redhead's neck, forcing the other to throw his head back, gasps and moans spilling out of his cute lips, his whole body thrashing with the urge to keep Bakugou's head pressed against him. He acted on the impulse, burying his hands in blond hair, hardening them slightly as he pressed on the locks, forcing them down. The male hissed at the feeling, but was secretly loving it.

And all the while they'd been playing this pseudo dominating game, their cocks had been rubbing tightly against each other, their trousers interfering with their pleasure, the smell leaking from Kirishima's tip enough to make Katsuki's head spin. He smelt so good, so edible, so fuckable. Which was exactly what the blond was planning. He wanted to dig his fingers up the other's arse and leave them there, make sure everyone knew he was not available to mate anyone else. Because he was Bakugou Katsuki's precious omega and fuck anyone else who decided to lay eyes on him.

Maybe he should do something about it.

Maybe he should claim what was rightfully his.

He licked the neck, covering as much skin in saliva as he could, trying to assess where the bite mark would look better. He wanted somewhere visible, and maybe he'd bite more than once, make sure the message was well received by everyone who glanced at Kirishima's neck. Bakugou Katsuki's. Don't touch. Don't look. Leaving a lot of angry red marks would definitely make everyone know who the alpha behind the damage was.

And Kirishima could leave one on his skin as well. Those scary shark teeth of his would definitely be good at marking, at showing the world that he had his mate and his choice had been made.

More licking, followed by slowly inhaling the deep, rich scent that was so obviously Kirishima. It was making him roll his eyes back in pleasure, goose bumps appearing all over his body, and small shivers nearly making him loose his concentration.

A new scent filled his nose as he realised that being this close to being mated was making Eijirou wet. The image in his brain made his heart skip a beat. He had such an influence over the omega he could hardly believe it.

Bakugou needed to make sure his realizations were true and he quickly stuffed his hand into the other's underwear, pulling them down slightly. His fingers started tracing soft, warm skin as they searched for his entrance. Finding the slick hole nearly made Katsuki cum in his pants. With the boxers down he could now properly smell the divine liquid oozing out of the omega and it was making him want to knot him very, very badly.

The boy underneath him was obviously enjoying himself as the blond toyed with his entrance. He was slowly rubbing a finger over the ring of muscle and that was enough to make Kirishima groan and moan.

It made Bakugou want to bite him.

Claim him.

Take him.

Make him his.

No one else could hear him like this.

No one could see him like this.

No one should smell him.

He had to be his.

His.

Forever.

Katsuki's mouth was back on his neck and his teeth pressed lightly against the skin, applying mock bites as he stuck a finger into Kirishima.

A long whine came from the redhead, which made the alpha want to claim him with more force. He'd never felt this before, never understood all the things he'd been told about normal alpha behaviour, but it all suddenly made sense.

This omega had to be his. He had to make him his or he would regret it eternally. He opened his mouth wider, preparing himself for the claiming bite as he stuffed his finger in to the second knuckle.

"Uh… I don't know if you should bite me, Bakugou." Kirishima panted underneath him. The blond had been so engrossed in his fantasy that the voice of the other shook him slightly, but wasn't enough to ease him out of his dream-like state.

"Hmmmmnn, why not?" He hummed, barely noticing what was said between them.

"I mean, I really like you, but I think it's kinda early and it's a big deal and…"

"S'not a big deal, though." Katsuki was pressing his tongue against the redhead's jawline, moving his finger in deeper into the omega's arse, which forced a loud moan from the other.

"What do you mean, it's not a big deal, it's forever, you know!?" The blond could feel Kirishima's discomfort in between his pants and groans. He could tell he was uneasy and something inside of him warned him to calm him down. His mind seemed to be somewhere else, however, and he was finding it hard to think. Whatever could he say to make it better?

"I've done it before, it's easy." He managed to say, opening his mouth wide and pressing his teeth against soft skin, gleaming thanks to the amount of saliva he'd added. He couldn't continue what he was about to do since he noticed Eijirou tense underneath him and he registered what he'd said. He pulled out of him, noticing the change in the omega.

"You've done it before!?"

Fuck. Fuck, fuck, fuck, fuck, fuck! Bakugou's mind raced, hoping there was something he could do to save the moment. He felt hardened hands push him away from the neck he'd been trying to dig his teeth into, and suddenly the situation was more real than before. He'd been brought back down abruptly, and he knew he was in a very delicate situation.

"You've bitten an omega, Bakugou? You've claimed someone? You are someone's mate?"

All the things he was saying were true but Katsuki didn't want to admit them. It wasn't what it seemed and he had to make it right somehow.

"Yes, but…"

"So you're someone else's alpha?"

"Yeah but no, look…"

"There's another omega? There's someone fucking else? I knew this couldn't be true! I knew this was too good for me! I knew something would happen!"

"Can you listen to me?" Bakugou was close to loosing his cool, to boiling over.

"You've got a pair!?"

"It was just a bite, Kirishima. It meant nothing!"

"AND YOU WERE GOING TO DO IT TO ME TOO! AND IT WOULD MEAN NOTHING AGAIN!"

"No! It's not what you think!"

"HOW IS IT NOT WHAT I THINK? YOU MARKED ANOTHER OMEGA. YOU CLAIMED SOMEONE ELSE AND YOU WANTED TO DO THE SAME TO ME!"

"Kirishima, It's-"

"WHAT? IT'S WHAT? What are you going to say exactly? You bit Midoriya when you were small when you were playing alphas and omegas and you think it meant nothing!? Because news flash for you, Bakugou, that still fucking counts!"

Katsuki stayed quiet, dumbfounded. He'd heard of cases like that, were kids screwed each other over by playing adult and biting other's necks. It fucked kids over completely. Some entered premature heats, others ended up, strangely enough, infertile for life. They all paired, except if they'd been bitten or had bitten betas, and had had to live with the consequences of their actions.

Kirishima understood what the silence meant completely.

"You…bit… Midoriya. That's why he's so… different. You… claimed him… He's your omega!"

Well, they weren't lies, but they weren't truths either, but Bakugou could feel the pain in the redhead's voice as he spoke.

The blond sighed, getting ready to start telling the story which he was so ashamed about. Yeah, he'd been smug about it up until now, but now, now he just felt bad. He felt like he'd screwed over more than just Midoriya.

He'd screwed himself up.

He'd fucked up whatever he had with Kirishima. And if he wasn't careful, he'd fuck Kirishima up too.

"I can't believe you!" Eijirou spat at him, his face contorting in disgust. His eyes were oozing hatred and betrayal and he was shacking as he was trying to get the alpha off of him. Bakugou tried to stop him from doing so but he eventually decided that struggling with him would make matters worse.

So he let the omega push him away and watched as the redhead left his room without even trying to dress himself properly.

How was Katsuki going to get himself out of this one?

It didn't help that the Bakusquad prevented Bakugou from actually interacting with Kirishima. At least they didn't seem to know what was going on, but they knew the omega was upset with him.

He'd tried to talk to him in class, but Sero got in his way and smirked at him while pointing at his elbows. Bakugou got the message.

He tried to get close to him at the canteen but Kaminari threatened to electrify his water and while the threat in itself wasn't a big deal and the beta didn't frighten him in the slightest, he could see Kirishima watching, and he was not in a position to scare the omega away further. So instead of getting angry he just walked away.

He tried to get into his dorm but Mina opened the door to Eijirou's room and just shook her head before closing it in his face.

But Bakugou was prepared to fight acid, tape and electricity if it got Kirishima to listen to him.

Kirishima was trembling in his bed. He'd managed to stop the tears from flowing for a day now and his friends had been extremely supportive. None of them knew what was going on, and even if they did, they wouldn't understand. Betas had it easy, they didn't have to deal with mated pairs and shit like that. And Mina was an alpha, but the omega couldn't be sure she wouldn't immediately back Bakugou up, taking his side.

He wasn't exactly alone but he felt very lonely. Like no one could understand him. The idea that maybe Midoriya did crossed his mind, but he didn't want to think about him. Whenever he did he just imagined Katsuki balls deep into another omega, one who was more of an omega than him. One who was soft and warm, and nice and brave, and confident, and smart and everything any alpha would ever want.

It wasn't just jealousy. It wasn't just that Bakugou had chosen what nature intended him to choose. There was hurt, since he'd been interested in him. He'd been stringing him along, making him believe he was wanted by alphas. And not just any alpha, but the best in class. But no, he'd been lied to, used. He was mated to an actual, real omega. Not one that was just a miserable mess, not strong enough to even get over his own past.

Fuck, it hurt. Kirishima hadn't expected rejection to hurt so much. But then again, it wasn't just rejection. It was self-doubt and jealousy, and a little bit of heart break.

He'd had a crush on Bakugou for so long and now all he could do about it was cry! And he still had so many things he wasn't sure about. When had Midoriya been claimed? Was it before Katsuki met him?

A small ray of hope opened up for Kirishima. Maybe the blond hadn't been lying. Maybe he'd regretted pairing up with Izuku. He didn't seem to like him at all and didn't even interact with him aside from snarling and looking down at him.

But maybe it was an act.

Maybe they had agreed to keep it like that, to pretend. Or maybe it went beyond that, maybe it was some kind of roleplay that got Bakugou off. Or maybe he was just into hate-sex so he had to claim someone he really despised?

And maybe they'd been fucking for months, every time Midoriya got his heat. None of them were absent during his heats, and Kirishima hated how he hadn't noticed before. Of course there was a reason Izuku the omega wasn't suffering during his heat week. Because he'd been claimed. Nature knew he had a partner, and only his alpha would be affected by his pheromones.

Eijirou, instead, along with all the unmated omegas, had to stay in his room every time his heat came. That or it could end up disastrously for them.

Kirishima cursed himself. Cursed his luck. Cursed how oblivious he'd been. Cursed how he still felt that Bakugou was the one for him.

Of course they'd been going too fast. Maybe that was Katsuki's intention from the beginning. Maybe he was one of those omega hoarders. He needed to claim as many omegas as he could to feel superior. Kirishima was a lot of things, but he wasn't just an omega that would be used to be claimed uselessly. Maybe Midoriya might have let him do whatever he wanted with him, but he wasn't about to let Bakugou do as he pleased.

The redhead bit hard, his sharp teeth clenching tightly as new tears fell down his face. A new determination swept him away from his misery and forced him to look ahead, unashamed.

Bakugou could be the biggest shit he wanted to be, but he would never fuck with Kirishima.

The omega hardened his body as he let out a frustrated whine, throwing his head back. These pathetic feelings he had for the disgusting alpha could not last. Would not last.

Eijirou raised his head and decided he loathed Bakugou Katsuki.