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Winner's Prize

Summary:

Kirishima is awakening his secondary gender and is convinced that, like generations before him, he will be a beta. But only Bakugou can discern that this is not the case, and there is something stronger lurking inside his friend that needs to come out. And he's willing to help him awaken it.

Written as part of the "Spring Breeding Bang".

Notes:

It's here! Story that was written for the Spring Breeding Bang anthology I collaborated on it with Helix, whom we had met collaborated before and in a good luck met again in other project. Just like then, it turned out great! You can find the picture in the text of the story, but also at the link below. Please be sure to leave a message or like or retweet Helix and her gorgeous picture as well!

KIRIBAKU ART 🔥 Twitter Helix🔥Bluesky Helix

Spoilers: None.

Reader warning: English is my second language, sorry for mistakes!

(See the end of the work for more notes.)

Work Text:

Kirishima knew something was wrong.

But he had no idea what .

There were so many symptoms, all of them isolated, yet he knew he had felt them at least once before. It was like they had been happening since the beginning, but he already knew what was going to happen. Dejavu . But how could it be when he was experiencing this for the first time?

He was always hungry. He growled. His pubic hair was more thick. His teeth and gums ached. His eyes were blurring. He had too much energy all the time. He was sweating more. He was shaking. He had to run morning, afternoon, and evening to get the raw emotion out of him that was seeping into every part of his body.

It was the same as when Shouji had protectively hugged Kaminari when Tokoyami had tried to hug him, baring his four, long teeth that looked more like a snake’s than a human’s.

It was the same as when Midoriya had fallen to his knees before Uraraka, red in the face, knees apart, his brow furrowed, as she experienced her first heat, and before she could escape to her room, her sweet scent flooded their entire hallway, and Midoriya had his first glimpse of his secondary sex.

It was the same as when Mina had bitten into every piece of meat, even though she had long thought about going vegan. She couldn’t refuse the taste of raw meat where a little blood still occasionally oozed out.

It was the same as when Todoroki began to smell like the coldest night in which someone had just built a fire and was burning fox skins. Nothing could resist his scent, he apologized, but his eyes spoke otherwise. He liked the way everyone turned around to look at him, he had to hug someone in their class every now and then to calm them down or draw their attention to him and they would suddenly listen to a word he said.

It was the same – but yet it couldn’t be the same .

Kirishima wasn’t an alpha.

What could he possibly be? Secondary sex was always determined genetically. Most people became betas through a combination of alpha hormone and omega hormone. Most of the population were betas, but that didn’t mean they weren’t born omegas or alphas. On the contrary, they mostly tried to preserve the last bits of their pure genes and reproduce among themselves. Thanks to social media, it was never hard for them to meet and get together, but mating was always difficult – two alphas would sometimes fight so hard that they got seriously hurt; two omegas would suffer so much in heat that they cheated. It was a heavy burden. Kirishima was actually glad he was destined to be a beta. His parents were betas too, his grandparents, great-grandparents and many others, all the way back to the fifteenth knee of their lineage.

What was the possibility that he was an alpha? Practically zero.

That was the important word – practically .

There were always theories that proved that genetics had managed to make so many “minus” individuals into “plus” individuals, and a secondary sex was born that would start a new line of the family again. But Kirishima was sure that he would never be one. He wasn’t… enough .

Kirishima growled. Again . He jerked as if the sound startled him. “You good?” Kaminari looked at him with a raised eyebrow, as if nothing had happened at all. As if he had no idea how much Kirishima was suffering. Didn’t anyone recognize that? Didn’t anyone find it strange?

“Y-yeah,” he stammered. He cleared his throat. His throat was dry. He was insanely thirsty! When he noticed how sweaty Kaminari was, with a single streak of sweat running down his forehead, he wanted to lick it up. “Ugh.”

“You’re not exactly fragrant either, bro,” Kaminari laughed, but puffed out his cheeks nonetheless. He smelled like tangerines and burnt torches. It wasn’t the most pleasant combination. Granted, anyone who had a secondary sex already manifested covered up and tried to cover their scent so as not to draw attention to themselves; but for health reasons, it was better for all genders to give their hormones a chance to renew their sweat glands once every three months. This time the term worked out for Kaminari, who rolled his eyes whenever anyone around him covered their nose.

“Sorry, that…” Kirishima didn’t really know what to say. Was he supposed to confess that he imagined what his sweat must have tasted like? He wasn’t even attracted to Kaminari. He was his friend. His beta friend, who had a smell perhaps stronger than most of his gender, but still – he was still just a friend . So what was his conscience trying to tell him? Like someone was flipping the levers between ’ Kirishima ’ and ’Horny wolf who didn’t understand what he wanted ’.

He was angry – at himself, at his secondary sex, at the world. But most of all, at the damn smell he could smell all around him. Why the hell did all alphas have to smell like that?

He growled again. “Fuck. Sorry.” He turned, reached for his towel and began to wipe himself in it. It was already soaked, it wasn’t helping at all. Without another word, he went into the locker room to get a new one. His fifth one today.

“Damn, what’s wrong with him?” Kaminari walked over to his friends and sat down on the floor to get some rest. Training with Aizawa was always tough. It had been even more challenging since most of them had awakened their secondary genders and fought not only with their quirks, but also with their scents and new intuition. “He acts like someone shoved thorns up his ass.

“He’s been sleeping badly for a few days. You’d be pissed too,” Sero shrugged. “Maybe it would help if his buddy wasn’t watching porn at eleven at night and moaning like a bitch.”

Kaminari didn’t even blush. “It’s called taking care of your own body and mental health . Look it up.”

“Shut up.” They both looked at Bakugou, who was lying on his back, his hands behind his head, his eyes closed. A moment ago, he had managed to twist Aoyama so that all he had to do was shove him and he would roll down the cliff like a wheelbarrow. Aoyama tried to wriggle out of his grasp, even using some of his omega pheromones on him, but that angered Bakugou even more. He hated it when someone tried that on him just for being an alpha. He could control himself. His alpha never clouded his brain. But none of his teenage friends understood that and kept trying. Only Midoriya was careful not to release too many unnecessary pheromones and encourage him to fight. Though Bakugou never needed a reason to do that.

“You don’t find Kirishima weird?”

Bakugou didn’t even flinch. “No more than you.”

“Hey!” Kaminari blushed and slapped his hand on his side. Bakugou didn’t respond.

“Maybe he needs a girlfriend,” Sero suggested, “he’s probably the only one of us who hasn’t even kissed yet.”

“Or a boy.” Kaminari had never forgotten that Kirishima had once confided in them about how it didn’t really matter who he was going to be with someday. He just needed to feel that love. And the excitement, too. He didn’t shy away from one-night stands or flirtations that would never amount to anything. He was always red in the face and stuttered when he talked about it. “Do you think anyone would be into him?”

“Hey.” Bakugou finally opened his eyes and looked at his classmates – he refused to call them friends , even though the name of the group in his contacts said otherwise – “What do you mean by that?”

“I’m just saying that Kirishima is…”

Bakugou frowned. “Yeah?”

“Dangerous,” Sero finished his line.

“Are we talking about the same Kirishima?”

Sero chuckled. “You don’t know what they say about him, do you?” Bakugou looked at him in confusion.

“It’s just gossip, but there’s some truth to it,” Kaminari assessed, lying down on his stomach next to Bakugou. The latter pulled away from him more and wrinkled his nose. Kaminari rolled his eyes. Why did Bakugou always have to be so dramatic? “Kirishima has a strong and amazing quirk. But also quite dangerous. Most of us are dating and having sex for the first time. And you don’t want it to end up with your boyfriend ripping you to shreds.”

“Do you really think he’s so stupid that he can’t tame his quirk?” Bakugou couldn’t believe it. Didn’t they have any idea who they were talking about? Kirishima was one of the strongest and most kind men he knew. Even if his second gende r – for he was still one of those who hadn’t yet awakened – made him want to hurt someone, he wouldn’t do it.

“You know how it is with first sex. Emotion, excitement, and boom – suddenly you shoot explosives in someone’s face and instead of spraying them with cum, you pay for plastic surgery.”

“Why are you even thinking about my quirk? What about yours – Sir, I-can-fry-my-own-brain?

Kaminari chuckled. “Sometimes I think of everyone I’d like to try it with.”

“You’re disgusting.” Bakugou sat up, elbows on his knees. Aoyama had just walked past them. Once he noticed that Bakugou was no longer resting, he decided to sit at the other end of the gym. He snorted. He was glad that after all these years, someone could still be afraid of him. He commanded respect and he liked it. “Kirishima’s not like that.”

“Disgusting? He’s sweating like a pig now.”

“And he’s munching. Damn, I don’t think I’ve ever heard Shouji munch that loud when all his hands were eating!”

“I’m sorry.” Everyone looked to the door where Kirishima was standing. He was frowning, but there was a genuine apology shining in his eyes. He had a damp towel around his neck. Another one already. “Really... I’m sorry.” He didn’t know what else to say.

“Don’t mind them,” Bakugou said, patting the seat next to him, “sit down, big guy .” Kirishima blushed and sat down next to his best friend with a smile.

“How much did you hear?” Sero asked bluntly.

“Just this. What? You’ve been slandering me longer?” It was supposed to sound like a joke, but they suddenly noticed how nervous their friend was. Even though he was trying to work on his self-confidence, there was still that little boy in him that never quite got his confidence up.

“We just think you should get laid.”

Kirishima’s cheeks flushed a little more. He wasn’t a prude, but he was still shy. He didn’t mind talking to guys about masturbation or watching porn together. However, he was nervous whenever he had to talk about sex in front of Bakugou. Just seeing him naked in the locker room and in the showers was enough to make him feel like he wanted to run up a high mountain and vent his frustration there. The frustration of how much he was attracted to his friend. “W-well... I don’t know. I don’t have anyone right now and…”

“But you’d like to.”

Kirishima sighed. He wanted to. He wanted to so fucking bad . He wanted to hug someone, hold them in his arms, almost crush them, and then breathe in their sweet scent. To bite his teeth into their neck. Pull their hair. To fuck so deeply it would make their stomachs bulge. Talk about how tight, wet, perfect they are. Hoping that–

“Wow, buddy, slow down,” Kaminari laughed. Kirishima jerked. He–He said that out loud? He covered his mouth and looked at Bakugou, startled. The latter rolled his eyes and braced his hands on the floor. “Where did that come from, buddy?”

Kirishima ran a hand through his hair. He groaned. He shouldn’t have done that. They were as sweaty as his entire body. “I actually... I don’t know…”

“So you’re just frustrated? Did we guess that?” Kaminari sounded as excited as if he had answered correctly on a test.

“I guess so.” Kirishima didn’t understand it himself. He shrugged and curled up more into himself.

“Leave him alone,” Bakugou growled at them, revealing his sharp teeth.

“Stop it,” Kaminari groaned, puckering his lips, “you know I find you sexy like this.”

“Get out.” Bakugou kicked him with his foot and Kaminari laughed. Still, he obeyed him. He stood up and walked over to Ojiro, who was currently talking to Hagakure, wagging his tail from side to side. Kaminari always found it irresistible and had to pet his bushy tail. “It looks like he’s fondling his dick.”

Sero chuckled. “I’m going to get a drink.” They all knew he wasn’t thirsty, he just wanted to leave the two alone. He always did that. Everyone knew that Kirishima saw Bakugou as a support and Bakugou saw Kirishima as a place to hide and heal his soul.

They sat next to each other for a while without saying a word. They just enjoyed the sight of their classmates fighting with each other and trying to improve their moves. “You okay?” Bakugou broke the silence between them. Kirishima was about to answer him, but the blond boy interrupted, “And don’t try to lie to me. I can feel it. You’re nervous. Tense.”

Kirishima bristle. “I guess... I just need a break.”

“Then tell Aizawa you’re sick and go to bed.”

“No... like... overall. From that…” He pointed to his head. “From all that.”

Bakugou frowned. He didn’t like it when Kirishima’s depressive states returned. It never meant anything good. “Fine.” He stood up, dusted his ass off, and yelled at Aizawa, “Hey! Teacher! I need to go into town with Kirishima today!” Kirishima looked at him in surprise. Aizawa gave him a thumbs up, his eyes never leaving Mineta and Iida, who were fighting Tsuyu and Koda together. Bakugou chuckled. “Five at the gate.” With that, he walked away and yelled something at Midoriya, who immediately smiled happily, ready to fight him and show him how much he had improved.

Kirishima licked his lips. Bakugou was alpha – he was supposed to smell bad like everyone else! But Bakugou smelled sweet, warm, erotic .

XXX

At five o’clock in the afternoon they both met at the gate. Kirishima looked at Bakugou in confusion, seeing that he had a backpack on his back that seemed to be overloaded with stuff. Usually when Kirishima needed a break, they went to the arcade together or watched some lame movie in the cinema, which they both commented on loudly afterwards, throwing popcorn at each other more than once. But now it seemed that Bakugou had other plans. He looked him over. He wasn’t wearing the clothes that most people wore to the mountains, and he was relieved that he wasn’t going to be doing any big hikes. Something inside him grumbled contentedly though. He didn’t know what it was, but he suppressed it immediately. He didn’t feel good about getting too far away from his room. Something about it still bothered him though – maybe it was the old posters, or the beige walls that were all over the dorm – but he wanted a change. Still, when he tried to move his bed away from the wall where Bakugou slept on the other side, he couldn’t. He got so sick he almost passed out on the spot. He immediately returned the bed to its place and went for a run instead.

“Hey!” Kirishima twitched. Bakugou frowned. He had probably been saying something to him for a while. He hadn’t heard him at all.

“S-sorry,” Kirishima stammered, “I-I was just thinking.”

“Apparently it hurt a lot.”

Kirishima always had only two reactions to this. He either laughed or got offended and started to return Bakugou’s verbal abuse. Most of the time, it depended on whether they were over the test or if it was just their typical friendly squabble. But not now – now he growled. Loud and clear.

“Don’t growl at me,” Bakugou growled at him just as sternly and loudly.

Kirishima immediately backed off. Bakugou’s voice was a little sharper, and he seemed to be speaking in a double voice at one point. That was when his alpha came to the surface, making it clear that he was the dominant one here. He was about to apologize again, but Bakugou just grunted loudly and crossed to the other side of the road, trusting Kirishima to follow him. And so he did. Kirishima immediately followed him, and when they entered the bus together, neither said a word.

Half an hour later, he and Bakugou reached a street Kirishima had never been to before. There were insurance companies, banks, and apartments that young people like the two of them could not afford. He had no reason to come here. Bakugou, however, led him through the streets as if he were here for the umpteenth time. His scent was a little stronger, more confident. As if perhaps the air was better in this part of town.

They came to the end of the street where there was a big door. Bakugou knocked on it four times briefly, waited a moment, and added another knock. The door opened. On their own. It seemed to be a password that only a select few knew.

Kirishima felt strange the whole time. Bakugou didn’t speak, but he didn’t seem unsure or annoyed. He looked normal. Like he always did when they spent time together away from school and the stares of their friends. The only thing missing was their touch. Occasionally, when no one was looking, they would stroke each other’s legs, hold hands that they covered with their jackets so no one would see, or tilt their heads to lean against each other. It was a gentle touch, perhaps even something that belonged only to their secondary gender, and Bakugou was marking Kirishima into his pack with this; yet it seemed to him that it was something special.

But since Kirishima had started to feel this way, he no longer did. He missed it. Something inside him cried lightly whenever he saw Bakugou, and instead of a gentle touch, all he got was a biting remark. Despite the fact that he wasn’t in the mood to talk to anyone right now, and he felt like fighting rather than talking; he missed Bakugou’s closeness. He was the only alpha who didn’t stink and whose presence was always warm and loving.

“Stop it.”

Kirishima raised his head. He didn’t even realize he was looking at the ground. He followed Bakugou into a building with nothing in it. Yet it looked well kept. There were dark parquet floors on the floor and the walls were painted grey. It looked like it had been renovated. “Where are we?”

“Somewhere where they can hopefully rid us of your stink.”

Kirishima flushed with shame. “Is it that bad? I’m sorry–”

“Now it was worse,” Bakugou didn’t let him finish and took his pack off his back. He opened it and pulled out several pieces of clothing. “What were you thinking about?”

Kirishima wasn’t about to admit it. He couldn’t tell him what he was missing. After all, it sounded so strange. He was almost an adult! “Just... a few things about the pack.”

Bakugou looked at him for a moment, then finally shrugged and threw his clothes at him. Kirishima looked him over. He blinked in confusion. “Those are my clothes.” He sniffed it. He didn’t smell anything, though.

“Freshly laundered from this morning.”

“Why?”

“You’ll see, Kirishima.” With that, Bakugou took out more pieces, this time for himself. Without saying anything to Kirishima, he began to change. Kirishima had seen him naked several times, in the locker room, in the sauna, in the public baths. Yet he felt that each time he found some other little thing that captivated him. Now it was a small freckle on his left thigh. “Get changed and stop peeping on me.”

“Y-Yes, sir!” Kirishima shouted, turning his back on him and changing. The red shirt he loved so much already had a small hole on the shoulder that he had tried to patch at least ten times. Loose, knee-length black pants and the comfortable shoes he wore for running.

He tossed his clothes into the same corner where Bakugou had put them. He too had changed into new clothes. A black, tight fitting shirt and leggings and loose, grey shorts over them. One of Bakugou’s favorite outfits to wear whenever he was feeling good. He had white blockers stuck to his neck, which kept Kirishima from smelling his pheromones. He scratched the fabric, and the redhead was sure he caught a bit of his scent for a moment. It was intoxicating.

“Come,” Bakugou said, “leave those things here. No one has a reservation here for tonight instead of me.”

Kirishima was about to ask where they were, until Bakugou opened another door, which led to a room that looked too much like a forest. It smelled of pine needles, moss, and water that rustled somewhere in the background. Above them was a high ceiling that was all glass, but the windows were blacked out, giving the room a darkened feel. Kirishima took a deep breath. In addition to the forest, he could smell mushrooms, flowers, and lots – really lots! – smells .

He closed his eyes. He inhaled again. He hummed contentedly as his nostrils tickled with the scent of an omega who was in heat here, someone biting hungrily at his throat as he whimpered with excitement. Soon that image was replaced by the alpha and beta cuddling together while they munched together from the strawberry cake that was smeared all over their bodies. And then – then two alphas. Powerful, masculine. They fought here. For a long time. There were still traces of blood on some of the stones.

Kirishima let out a contented sigh. He began to breathe rapidly. Yes, he knew what this place was. “The alpha battleground.”

“Then you’re not that stupid.”

Kirishima didn’t respond to that. “Why? I’m not–”

“You’re waking up,” Bakugou told him sternly, as if he were teaching him a subject he should have known long ago, “didn’t you recognize that about yourself?”

Kirishima swallowed dryly. “I-I didn’t know if…” He shook his head. “I shouldn’t be here. I’m not an alpha.”

Bakugou snorted. “It’s not just alphas who come here. Can’t you feel it?”

“Of course I feel it.” There was a lot underneath that. Not just the fighting, but the love play, and in some places, the torture that ended in gouts of blood and semen. This place was as scary as it was exciting. “But what am I doing here?”

“This is where I spend my ruts.”

Kirishima widened his eyes at him. It was true that anyone could use the school’s designated area during their heat period, which was a building right next to the school’s rector’s office that had soundproofed rooms that didn’t have a single bit of scent coming from them. Medical, school, psychological and social staff worked there. It was one of the best workplaces for youngsters who were experiencing the transition to secondary gender as well as for those who had not yet managed to tame their days so much. Most didn’t make it to the turn of adulthood, around the age of twenty-one.

But Bakugou always disappeared. He got a three-day pass and returned rested and happy. He never had any scratches or bruises on him, so he didn’t go fighting like most alphas did in the illegal arenas they built for them under the cities. But he also didn’t smell like anyone else, so he probably hadn’t even tried to enjoy casual sex like most in his secondary gender category tended to. When someone asked him where he was disappearing to, he always just shrugged and said he was home. Kirishima would always stop by their house, perhaps hoping he could somehow help his friend out of his torment, but whenever his parents answered the door, all they would say was that he wasn’t there. They didn’t tell him anything more. But it was clear from their looks that they knew where their son was. Kirishima always just said thank you and returned to the dorm, where he felt lost and sad until Bakugou returned.

“And here you…?”

“Lived, ate, slept.” Bakugou put his hands in his pockets. “Fought.” He looked at Kirishima. “Fucked.”

Kirishima growled. Loudly, unpleasantly. He himself was startled by how awful the sound was. Bakugou didn’t move. Kirishima wanted to apologize to him, but something inside him wouldn’t let him. It was as if something was gripping him by the throat, preventing him from speaking.

Bakugou just chuckled. “I knew it. Your alpha is coming through.” He reached out to Kirishima, but Kirishima slapped his hand away. Hard. Bakugou was sure he would draw a bruise on the spot within a few hours. The redhead bared his teeth at him, revealing his long canines. “Handsome.”

Kirishima shuddered. He closed his mouth, his pupils dilating all over. He couldn’t swallow all the saliva that had accumulated in his mouth. A bit of it spilled out onto his chin. “S-sorry,” he stammered. His voice returned to its normal pitch. “I-I don’t know w-what’s wrong with me,” he stammered innocently. It looked like he was going to cry any second.

Bakugou gently wiped the saliva from his chin. “You’re waking up,” he told him again.

“I know!” Kirishima exclaimed in frustration. “But I should – I should be a beta! Not– this !” He threw his arms around himself. He thought the place was – beautiful . The smells, the feelings it evoked in him. But he felt like he didn’t belong here. Even though something inside him tried to tell him it was right.

“Why are you so resistant to being who you are, alpha ?”

It was the first time anyone had ever called him that. Kirishima shuddered. He liked that name so much! His ears began to buzz. “T-That’s... that’s bullshit. My family–”

“You know how it is with genetics. You can’t rely on it.”

“But–”

“Why are you scared?”

“I’m not scared.”

“Right,” Bakugou snorted. “Then prove it to me.”

Kirishima blinked in confusion. “How?”

“Beat me.”

A challenge. Not so much from someone, but from the alpha, Bakugo. They didn’t take it lightly. Not only were they earning their place and dominance, they were also determining their position in the pack. They submitted, they led. A challenge could only go one of two ways – victory or defeat. There was no in-between. These were no ordinary fights. They were full of biting, scratching, skin tearing, screaming, blood, saliva, sometimes semen or urine, depending on how the alphas tried to mark their victory.

“Bakugou…”

Bakugou approached dangerously close to him. “Do you accept?”

“But…” Kirishima still wasn’t sure.

“Kirishima, I know what’s going on. I was in the same situation as you. I just didn’t have anyone to tell me what the fuck was going on. I had to figure everything out on my own.” For the first time, in all the time that Kirishima had begun to change internally, Bakugou touched him. He gently took his hands in his. They were both sweaty. Kirishima groaned at the gentle touch. Bakugou was glad he hadn’t noticed how the sound made his face gently turn pink. “I know what’s going on. And most of all, I know how hard and scary it is when you don’t know.”

“It’s fucking terrible,” Kirishima breathed, closing his eyes tightly.

“Let me help you.” Kirishima looked at him resignedly. Bakugou swallowed and cleared his throat. “But you know I don’t excel at talking.”

“You did pretty well just now.”

Bakugou let go of his hands and moved them back to his body. “You also don’t know how long I’ve been practicing in front of the mirror.” Kirishima smiled at him. Bakugou looked him over, feeling his breathing quicken, the color in his eyes darken, the way he was sweating. They needed to hurry up. Before Kirishima’s secondary gender took control of his thoughts and before anything happened, Bakugou would tear him apart. “Let’s get started, shall we? Let’s not dwell on any chatter here.”

“Okay,” Kirishima said, “and Bakugou?”

“Yes?”

“Thank you. Really.”

“Hm.”

“You’re... the best…” Kirishima frowned. Why couldn’t he suddenly say the word ’friend’ ? He knew a long time ago that it didn’t describe how he felt about Bakugou, but why did he suddenly feel like his tongue was swollen and his mouth wouldn’t open?

“I know that,” Bakugou chuckled.

“Hm.” Kirishima was sad he couldn’t describe it better. “How are we going to do this? Do you want to train without quirks or with them?”

Bakugou didn’t say anything in response. He walked a little further away, standing up straight, his hands moving to his neck. Before Kirishima could react Bakugou removed his blockers from his neck. The room suddenly filled with Bakugou’s scent. His skin smelled like caramel. The sweat was pungent and tickled his nose like ash from a newly lit fire. His breath was like cinnamon – as sweet and heavy on the tongue as someone trying to swallow it before choking on it. Kirishima shuddered. Bakugou’s scent had always been strong, but he could control his pheromones so much that no one had ever smelled exactly what Bakugou smelled like. This was the first time for Kirishima.

It was a first for Bakugou as well. Letting his scent flood the entire room and seeing someone perceive him not only as a human but also as an alpha was new and a little dangerous. He didn’t know if he liked the feeling. But what he did sense was the adrenaline that began to burn in his lungs, his chest, his stomach. His legs began to shake from wanting to run.

Kirishima kept his eyes closed until the scent grew even stronger. His nostrils flared. Suddenly he began to understand what it meant when others could guess what he was thinking, if something was bothering him, if he was sad or happy. Because now– now he felt it too!

He opened his eyes sharply. The smell was gone. When he looked in front of him Bakugou was not standing in front of him. He wanted to open his mouth, to ask where he was, but instead he bent down and grabbed his stomach tightly. A sharp pain hit him all over his body. He cringed and for a moment his eyes glazed over.

When he finally began to take in the world instead of the stars before his eyes, he was shaking all over and breathing deeply. His teeth ached. He could feel some of them were a little longer and sharper than normal. He was changing. Right here and now. With Bakugou challenging him to a duel, hoping to bring out something in him he hadn’t even hoped for – an alpha.

“Bakugou,” he growled. Even his voice sounded different all of a sudden. Rough, without the sweet and friendly undertone. Suddenly, he was a few years older. He liked it. It excited him. “Katsuki,” he growled again, in a voice he didn’t even recognize. It was as if he was talking double.

That was it – that was his secondary gender, speaking from his mind, his soul, his heart, his whole body. Kirishima began to fall for it.

“Beat me.”

Kirishima moaned. Bakugo’s voice was far away, and yet he felt like it was whispered right into his ear. How did he do that? How could he perceive something so distant? He knew that Bakugou was wandering somewhere behind the third row of tall conifers. How – how could he possibly know .

“Don’t worry.”

Kirishima got to his feet. He took a deep breath. The smells around him were getting stronger. His head was spinning. But instead, he tried to focus on the one that interested him the most.

“Find me.”

Kirishima started off in the direction of the sweetest scent he’d ever smelled. He ran through the trees, cutting branches, stepping on flowers. He didn’t care that the thorns from the bushes had begun to cut into his skin. He had one goal. He was ahead of him. Far away, but he was getting closer.

Bakugou was running. He threaded his way through the trees, laughing. Not with his voice, but with his scent. Kirishima could feel him laughing. He enjoyed the game when Kirishima didn’t have the upper hand. It annoyed Kirishima. His inner alpha began to scream and swear. He wanted to grab Bakugou, pull him to the ground and punch him in the face so he would finally stop laughing. He needed to touch him, to feel him beneath him, to mark him .

“Katsuki,” Kirishima whispered excitedly and ran to one of the stones. A stream flowed around them. Bakugou thus covered not only his scent, but also his steps. Where could he be? He looked around, but couldn’t see him.

“Concentrate.”

Kirishima smelled him. He was behind him. He turned sharply, but instead immediately fell to the ground. Bakugou punched him hard in the face. It made him stumble. Could it be that he broke his nose? Kirishima had broken it so many times that it was crooked. He grabbed his nose. He was bleeding. His own blood made him angry. “You’re slow,” Bakugou said as he put the sole of his boot on his shoulder and pushed him more to the ground. Kirishima steeled his arm and tried to push him away, but Bakugou was counting on it. His foot immediately withdrew, Kirishima’s hand crashing into the stone. There was an unpleasant, screeching sound and a few sparks around them. “You don’t deserve to beat me,” he whispered in his ear as he kicked him hard in the stomach.

Kirishima remained lying on the stone for a moment before gathering his strength and getting up. Bakugou wasn’t there again. He was playing with him. He knew this place. He knew where to hide, where to watch him from. He wanted to play with him like his toy and show him who was boss. Kirishima didn’t want to give up. Not so easily, not now that he could finally unleash his inner self and be the alpha that toiled on the outside.

Kirishima followed his scent. He no longer had to suck in the air around him. He could feel where Bakugou’s scent was stronger, where it was fading. He could feel where he was just rubbing himself and trying to confuse him. Suddenly, he turned and struck the bark of one of the trees with a steady hand. Bakugou stood beside him, looked at his gnarled hand in the trunk, and chuckled. “You’re a fast learner,” he said, placing his hand on his shoulder. His palm began to crackle. Kirishima immediately pulled away from him. He felt like firing one of his explosions before he even smelled the sweet scent or felt the heat. He was surprised himself. Would he be able to predict Bakugo’s actions now? Would he be able to work with him better?

Bakugou smiled at him. Sweetly, almost as if he admired him. Kirishima bristled. Bakugou released a few more pheromones. His knees buckled. No. He mustn’t let himself be manipulated so easily. “You don’t have enough strength yet.” Bakugou walked over to him, grabbed his chin, and forced him to look at him. “Alpha.” He fired explosions from his hands and let himself be shot into the air. Kirishima looked at him as if he’d grown angel wings, and for a moment – in the glow of the explosion – it looked that way. Kirishima admired him until he was out of sight.

Kirishima started running in the direction he was going. The familiar smell of explosions tickled his nose, and it was clean. It was as if he could suddenly write down the structure they had within them. It was amazing. Kirishima was letting his new abilities wash over him, as if another quirk was working its way through him. Was that what it was like then? To be consumed by his secondary gender? Was it always so intoxicating ?

By the time Bakugou hit the ground, Kirishima was already in place. He was waiting for him. He was faster, more agile. Bakugou took a breath. He could smell him. But not as strongly yet. He needed to push him a little more. To force his inner self to take over and finally make him who he was.

“Come on,” Bakugou said, taking a fighting stance. Kirishima was immediately at his side. They began to fight as they were used to when they trained. But this time there was something raw, animalistic about it. They growled at each other as if someone had let them off the chain. They opened their mouths as if they were trying to bite through each other’s skin and mark themselves as the winner. Their sweat was thicker, thicker. It ran down their bodies, soaking their clothes. Hair sticking to their cheeks, their bodies tense, full of adrenaline.

One punch, two, 50. They watched each other as if in slow motion, but their movements were fast. The blows rougher and harder. Kirishima’s nose was bleeding again, Bakugou had wounds on his shoulders and torn leggings on his thighs. Occasionally one fell on his back, then the other. Once they rolled beneath each other, the second time they were within a few feet of each other until they wiped their wet foreheads and bloody chins and attacked each other again.

They had no idea how long it lasted, but judging by their bodies, it was still not long enough. 

They needed more, more, more .

“Gotcha!” Bakugou shouted triumphantly as he finally pinned Kirishima to the ground. Kirishima growled at him, but Bakugou used all his strength to hold him down. “Down, alpha!” He shouted in his dual voice.

Kirishima obeyed him immediately. He lay on his back, arms raised above his head, lifted his butt off the ground and groaned. He was so tight in his pants that his erection seemed about to rip his pants open and reveal all his massive beauty. Kirishima groaned several times. “K-Katsuki,” he whispered, as if he was afraid of the name.

Bakugou dug his fingers into his thighs. He must not give in to this. Not yet. “Lie down, alpha.” Kirishima obeyed him. He lay flat, legs and arms outstretched. Gaze clouded with excitement, mouth open, tongue sticking out slightly. “Good alpha.”

“Katsuki,” Kirishima whispered again. He looked down at his crotch. He should be ashamed. Apologize. Say something. It was normal for him to get aroused sometimes during a fight. But he never pointed it out. He wasn’t the only one it happened to. It was a body reaction he couldn’t hold back, not when he had so much testosterone and adrenaline in him. But now he knew that it wasn’t just the fighting that was to blame, but what was happening between them. Bakugou kneeling over his body, giving him orders. He looked more masculine, more mature, so sexy. “Katsuki.” His voice was a little rougher.

That was what Bakugou needed. “Oh? Are you awake now?” Kirishima’s pupils narrowed a little. Bakugou smiled slyly. “Hm, still not fully there.” He looked down at his crotch. He licked his lips and bit them gently. “I knew this would happen one day,” he said, touching his crotch. Kirishima closed his eyes tightly and groaned loudly. He moved up and down a few times, roughly, almost as if something hurt and he was trying to get away from it. “Fuck,” he whispered and laughed, “did you just cum?”

Kirishima’s eyes widened. His eyelids were heavy. “Kat–” He didn’t finish when Bakugou kissed him. It wasn’t a gentle kiss. He immediately began kissing him roughly, his tongue exploring every inch of his mouth. His hands dug into his hair and began pulling at it as if he was going to pluck it out.

Kirishima felt a burning sensation in his chest. He couldn’t breathe. Bakugo’s scent and mouth were choking him. His hands trembled, as did his legs. He wanted to pull away, but his body wouldn’t listen. He knew it was meant to. This was where he was always meant to be.

He wanted more .

He wanted to taste more.

He wanted to be more .

Kirishima was suddenly knocked to the ground. He grabbed him firmly by the shoulders and shouted at him. His eyes were red, glowing as if someone had irradiated them with a laser. His teeth were long, blood dripping from his gums. “Mine!”

“Finally!” Bakugou exclaimed excitedly, his cheeks red from the kiss and excitement. “Come on, alpha, show me how a winner acts!”

Kirishima was a winner. Bakugou was his prize. 

He could do whatever he wanted with him.

Kirishima growled, his body tense and firm. His wet pants were getting uncomfortable. He ripped them off as well as his shirt. Suddenly he was naked, his cock swollen, red and purple and white with semen that couldn’t dry.

“Fuck,” Bakugou whispered, “that’s so much!” He touched the juice he had on his cock and wet all his fingers with it.

Kirishima moaned in satisfaction and brought his hips to his mouth. “Don’t even think about it,” Bakugou said, rising up on his elbows. Kirishima gave him a stern look. “No fucking way. First time you’ll have a knot. I’m not going to break my jaw over you shoving it all the way down my throat and tying us together.”

“I want to!”  Kirishima exclaimed. His mind was becoming clouded with alpha and he was stopping putting all the sentences together.

“No.”

“I want to!”

“No!” Bakugou grabbed his neck and squeezed it tightly. Kirishima groaned. Bakugou became even more excited. “Just because you fuck me doesn’t mean I’m some fucking bitch, okay? You’re going to listen to me and do what I want!”

Kirishima whimpered and began to buck against his hard touch. Bakugou laughed in his face. Kirishima’s alpha couldn’t let that happen. He steeled his fingers and tore at Bakugou’s favorite outfit until the blond was completely naked in front of him. Bakugou couldn’t even get mad at him for how aroused he was. His cock was just as engorged as Kirishima’s, only a little shorter and lighter. A lump was forming on his testicles, showing that Bakugou had already formed a knot.

“Who?” Kirishima asked through the strong touch on his neck.

Bakugou raised an eyebrow. “That’s what made you wake up, isn’t it? The idea that I’ve fucked someone before and you wouldn’t be the first.”

“Mine!” Kirishima’s hands closed beside his head and pressed against him. Their penises brushed against each other, soaking each other with their juices. Bakugou groaned, relaxing his grip on his neck for a moment. Kirishima took advantage of it. He grabbed Bakugou’s thighs and forced him to writhe all over. He looked down at his cock and licked his lips. He shook Bakugo’s hands off of him and leaned towards his opening. He began licking it hungrily, his tongue pushing inside. Bakugou was spread open, ready, the taste of strawberries on his tongue. Kirishima grunted again and looked at Bakugou in warning.

“What? You expected me to come unprepared? I knew what was coming. All boys in the class envy your dick.” Still, Kirishima didn’t stop. He could feel Bakugo’s scent becoming more relaxed. He liked it. He continued until he felt Bakugou start to pull his hair, trying to get him to stop. Kirishima didn’t want that though. After all, he was the winner of their challenge, right? He could do whatever he wanted with him!

Bakugou didn’t even have time to say anything when a familiar body swept through his entire body and he climaxed on his chest and stomach. It was just a faint trickle, one that would take him at least ten more times through the actual climax in rut before he was satisfied enough. He smiled contentedly and kicked Kirishima’s shoulder.

The redhead didn’t even wipe his mouth as he pulled away and kissed him. Bakugou forgave him for once. He knew how hard it was to experience his first heat. “Inside?” Kirishima asked him almost cutely. His voice was rough and raspy from all the yelling and growling and the way he strained his tongue. Still, Bakugou rubbed his head against it slightly, trying to catch at least some of his scent. It was permission. A tacit approval.

Kirishima grabbed Bakugou by the ankles and bent him all over. “Always... always!” He exclaimed. He hoped Bakugou understood him. He always wanted to do that. He loved how flexible he was. There were so many possibilities of what to do with him. Positions to try with him. “I want.”

“You can.” Bakugou reached out and grabbed his neck again. “You can, alpha.”

KRBK Spring Breeding Bang 2025 - Helix

Kirishima immediately snapped to attention. His entire cock immediately burrowed into his entrance, all the way to the root. Bakugou cried out, Kirishima howled like an animal and climaxed. He opened his mouth and started drooling like he hadn’t had a drink in a week. “Disgusting,” Bakugou chuckled, but nothing about his scent or his face suggested he didn’t like it. “You’re so disgusting, alpha.”

“Katsuki.”

Bakugou choked him even harder. Kirishima groaned. “Do your best. If you want to fuck me like an alpha, then do it. Don’t make me feel ashamed for choosing you .” Kirishima would never let that happen. He began to fuck into him – hard, rough, deep. Bakugou moaned louder and louder with each thrust, his scent seeping into Kirishima’s skin. He was sure that even if he bathed he would never wash the scent from him. He didn’t mind. He would proudly display that Bakugou was his alone. Just the thought that this – amazing, gorgeous, intelligent, best – man was his made him climax again. This time, though, he didn’t stop. He fucked him deeper and deeper and deeper and deeper . He felt like he was possessed.

“Come on, Eijirou, come on.” Bakugou pressed harder.

Only now did Kirishima realize what was happening. Bakugou was massaging his sweat glands. He wanted him to start smelling like a true alpha, to surrender to his true self. “Ka–”

“Please, alpha.”

That was exactly what he needed. Kirishima groaned and finally took a breath. Not just through his mouth, but through the glands that opened. They caressed Bakugou’s palms, sucked in some of his sweat, and scented him in return. Bakugou groaned loudly and climaxed. Yes – this was it! Finally, Kirishima could smell it. Oblivious to his climax, he quickly grabbed the redhead by the shoulders and pulled him onto his body. He buried his nose in his neck and sucked hard. He smelled wonderful! Like the mountains in winter and the thick fog over the morning. “Eijirou, Eijirou, Eijirou,” he whispered.

“Mine, mine, mine,” Kirishima growled in his ear, not stopping. His body ached, his testicles ached, he felt dizzy. His body screamed to rest for a moment, but his brain and heart knew he must not. That he had to connect with Bakug, not let him have the chance to run away from him and leave him alone. He hugged him tightly and began to nibble his neck. His teeth came dangerously close to his glands and Bakugou - let him. He growled contentedly, tilting his head to the side and letting him lick his sweaty neck as if he didn’t even realize how dangerous it was at the moment.

“Knot me, alpha.”

Kirishima was weak to his commands. It was clear that despite the fact that they were on the same level, he was the one who was less than Bakugou when it came to insinuating himself into Bakugou. He held the reins, he had him on a leash. He could do whatever he wanted with him. And he willingly let him.

He thrusted hard enough to get his knot into Bakugou and climaxed one last time. Bakugou groaned in satisfaction and dug his nails into Kirishima’s back. On purpose, he did it hard enough to leave red scratches. He wanted everyone to see what he had done to him. It was like marking his territory.

“Katsuki,” Kirishima whimpered in his normal voice. He was getting back to normal. At least for a while.

Bakugou finally, after all this time, stroked him gently, almost caringly. On his head, his ear, his cheek, he buried his fingers in his hair and kissed him contentedly on the cheek. “Smart and gorgeous alpha.” Kirishima grunted contentedly. “Get some rest.”

Bakugou looked out through the glass ceiling. It was already night. He would return when Kirishima’s rut was over. He knew Aizawa would be angry with them. He knew how he felt about that. He warned all his students never to experiment among themselves, preferring instead to get advice and help from adult experts. They knew the consequences of doing so. From pregnancy, to unwanted coupling, to death when partners were separated or torn apart during the act.

“K-Katsuki…” whispered Kirishima as he began to wiggle his pelvis. His cock was hard again, ready to climax again several times in a row, his entire scent pressing into every millimeter of Bakugous body.

Bakugou closed his eyes in satisfaction. He would leave all his worries for later. For now, he had Kirishima - his alpha - to take care of.

Notes:

Thank for every hit(s), kudo(s) and comment(s). It means a lot to me. :)