Chapter Text
There are two so called puberty phases. The first is the showing, it’s when your body finally steps into its adult phase, usually in mid to late teens is when one would expect to know whether they are an alpha, beta or omega. They will start presenting the usual scent of their rank but other than that it’s nothing crazy. Most kids tend to show which they will present by personality and attitude, kids who come off as alpha’s tend to be just that but there have been times which the opposite has happened.
The second puberty is the time in which heat and ruts happen, it’s basically the most active puberty because now the body is able and wanting to make children. Usually late-teens and early adult life is when this happens and it is the most troublesome time for most.
Kids in high school just have to worry about the first puberty and how that would affect certain friendships and dynamics. It can be hard for other alpha’s to get along depending on the personality and how they deal with the new flow of hormones. Teachers are to make special arrangements in their class if need be for when their students start presenting. Bakugo was to no one’s surprise the first to present of his classmates and that day he walked around like he truly owned the damn school, he scented his two lovers Kirishima and Kaminari eagerly that day. He was of course an alpha
The three were in a poly relationship, it was not the smartest idea to date before you presented due to the fact there’s no sure way of telling who is an alpha, beta or omega until then. What if you’re both alphas? Both omegas? Can dating truly continue and turn into something serious if that happens? Most would say no but these three decided to do their own thing. They made a promise that even if they all presented as alpha’s they’d be together so when Bakugo showed the other two were happy and proud of him.
Now it was time to wait for the other two, most people put money on Kirishima and Kaminari both being beta’s. They lacked the drive to be leaders but were sociable and hard working. If it wasn’t that then Kirishima with his big build might gain him the stature of alpha and Kaminari would still be a beta. It was hard to see the blond as anything but a beta, he was upfront, bold in his own way but lacked desire to be confrontational or take a leadership role. He didn’t have aggressive behavior, he was glue that pulled people together so he made for the perfect beta in a pack.
It was just a matter of time and in their second year Kirishima finally showed. A strong alpha scent filled the room, it was the warm and inviting kind that got the class’ attention in no time. He smiled sheepishly when all the eyes were on him but he felt it too, that extra boost of an alpha. He sat up straighter, smiled confidently and even when the teacher told him suppress his scent he didn’t feel as embarrassed as he thought he would. He glanced to Bakugo, the three agreed no matter what they love each other but he wanted to see Bakugo’s reaction. The ash blond was smirking devilishly at him and it made Kirishima’s tail wag happily. They’d be okay, they wouldn’t fight for some weird desire to show dominance, they’d still be them and they could still be together.
Everything was good and he looked to Kaminari in front of him who had turned to give him a smile before looking back to the front of the class before the teacher scolded him. Now, everyone knew what the dynamic would be, two alphas and a beta. Thankfully, it seems Bakugo respected and loved Kirishima enough not to fight him for some abstract idea of being the top dog. Kirishima had no desire to fight to figure out who was the bigger badder alpha either, they were both great alpha’s and had nothing to prove. Wrestling wasn’t out, playful fighting was a must but they wouldn’t get too over the top, at least they’d try not to.
Sometimes they would find their aggressive alpha nature getting the better of them when they played and if they had the one pinned down they’d dry hump them a bit to show dominance. That usually resulted in the other to snarl which usually got Kaminari there to break it up and calm them down. They blamed it on the raging hormones, they can’t control their body as well but they’d apologize to one another and settle with cuddling.
The mix of two alpha scents was pretty overpowering to those who got a big whiff of it. If the two weren’t suppressing it and were hanging around each other their stench tended to carry. It was by no means a bad stinky smell but it was pungent and even Kaminari found himself taken aback by it when he met up with the two. He got used to it soon enough but the first few weeks were a bit difficult especially with them aggressively scenting him. He hasn’t presented yet but they were alphas and Kaminari was their’s so he must smell like them at all times and the moment he doesn’t smell like them then they’re on him.
Sometimes Kaminari felt like he was rubbed raw, as if his skin was being worn away but he loved them so he let them do as they pleased. It was nice and warm so he couldn’t complain too much about all the attention.
Now it was just his turn to present. He had beta written all over him so he was sure one of these days he’d just start exuding his beta scent and all would be golden. If he turned out to be an alpha he’d be surprised but happy and if he were to be the other...well, lets say he wouldn’t be excited. Being an omega was not good for hero work, it wasn’t good for poly relationships either and everyone knew, at least the teachers knew that if Kaminari presented as an omega there might be a fight.
Sometimes Bakugo and Kirishima can be overwhelmed by their own hormones and act out in ways they didn’t really mean to act out. If Kaminari was an omega they might make him choose who he’ll be with because they simply can’t share an omega and he’d hate that. They love each other, there shouldn’t be a choice that needs to be made no matter what but their instincts could cut that away. He didn’t want that so he silently prayed to be a beta.
Things were going well though with his two alphas, school was hard since he wasn’t a great academic but the hero part was cool! This time of the year was the culture festival and class 2-A and class 2-B were doing a joint event. Working with those guys always made Kaminari excited, new but still familiar faces gave him a burst of energy. Today he was helping carrying a couple boxes with Ibara to the 2-B room. They were going to build an Alice in Wonderland theme maze and right now they were gathering lights so they can change the bulbs around to different colored ones. Kirishima and Bakugo were helping build the framework in the auditorium.
“If we crack some glow sticks we can use it as paint for some cool effects!”
“If it can dry completely it might be useful.” She comments idly and Kaminari nods.
“Yeah, I’m sure it can! Then we can get some black lights to make them glow really well! I’m sure my pal Tokoyomi has some or knows a place that sells them.”
“We’ll have to remember to ask him next time we see him.” She says as they enter and put the stuff down on the desk.
“Ask who what?” Tetsutetsu asks as he approaches the two, he was trying to untangle some lights when they entered and was growing increasingly frustrated. He needed a distraction before he tore them apart.
“Kaminari-san was just saying how using glow sticks may be useful.”
“And we can break them open to splatter them around for a cool look! We can get black lights too! We’re gonna ask Tokoyomi when we see him!”
“Kuroiro should have some of that stuff too!” Tetsutetsu says eagerly and seems very fond of the idea as well.
“When we see them we’ll have to ask them for their stash. I can probably go to a party store or online for the glow sticks! We’ll get lots of different colors!”
“I should ask the teacher about this first and the ones painting will have to have a say in it so don’t go ordering anything just yet.” Ibara says and looks to the pile of tangled lights. “I’ll leave you two to the detangling.” She says before walking out to find the coordinator of the maze.
The two sit down on the floor around the mess of tangled light and start to work on detangling them.
“Hand me that end…”
“Sure.”
The two sit in concentrated silence as they try to detangle the lights, they talk randomly about their ideas, it’s mostly Kaminari spurting out anything that comes to mind but they’re both trying to work really hard to detangle this mess.
Tetsutetsu stops after a bit and rubs his neck. “Daaammnn, there’s got to be three different strings of lights in this mess and I don’t know if we’ll ever get them apart!”
“The wire is all the same color too.” Kaminari sighs and leans back on his hands and looks to the sky out the window. It’s a nice day out and he really doesn’t want to be in here now. He’s frustrated and he misses his boyfriends who are out having a ton of fun probably. He lets out a small whine as his ears lay flat against his head and suddenly Tetsutetsu is very close to him. He’s sniffing Kaminari and although the blond leans away with squinted eyes the silver haired teen leans in more. The blond starts to pout and looks at the other with a raised brow since he’s not sure what he’s doing.
Tetsutetsu was a chill dude, he was really funny and a dude bro like Kirishima. They are pretty similar with their quirks and love of manly things. Tetsutetsu was affectionate with his friends and was easy to get along with, he wasn’t afraid to be close to others so it didn’t signal any alarms in Kaminari’s head when he was close it was the fact he was staring at him and almost crawling over him to smell him and scent him that made him uncomfortable. Everyone in their year and likely even teens in the other years know that Kaminari is scented by a select number of people. His parents, Bakugo and Kirishima and since he has been living in the dorms it’s just Bakugo and Kirishima who put their scent on him.
“Uhm…” He tried to scoot away but Tetsutetsu just scooted closer.
“It’s okay.” The bigger male says softly, in a deep voice that Kaminari hasn’t heard him use before and it kind of makes his heart flutter. He gulps and tries to read the others expression but he comes up clueless to the reason behind Tetsutetsu’s action, he’s exuding a strong alpha scent as if he’s trying to get the whole room thick with it.
Kaminari felt overwhelmed to say the least, something in him made him feel nervous and somehow Tetsutetsu looked bigger than usual. “It’s okay.” Tetsutetsu says again and reaches a hand to cup the others cheek and continues to crawl closer until Kaminari just gives in and lays back on the floor. Tetsutetsu’s thumb rubs his cheek for a moment before he nuzzles under the blond’s neck and uses his body to box the other in so he can’t go anywhere.
“M-Man, uhmm...shit. You’re gonna piss them off so--” He feels helpless and for some reason words just aren’t forming nor is an adequate reaction to all this. The bigger male is just nuzzling him, licking his cheek and ears once in a while and trying to make Kaminari relax but honestly it’s making him feel more nervous. He lets out another soft whine which makes Tetsutetsu press into him more.
“I’m here, I’m right here. I’ll protect you.” Tetsutetsu says gently and licks at Kaminari’s ear.
Ibara, who was walking back to check on them takes in the scents, opens the door to the scene and blinks a few times at what she’s seeing. Kaminari has his eyes closed tightly and he’s shaking as Tetsutetsu nuzzles and grooms him and exudes his alpha scent to relax him. Ibara sighs as she considers the right course of action before taking a step back and closing the door. She can’t very well pull Tetsutetsu off at the moment so she decides it’s best to get a teacher involved, of course she seeks out King Vlad and lets him know the situation as soon as possible.
He grumbles and curses under his breath before stomping off towards the room. It’s pretty much everyone’s worst fears, Kaminari has presented as an omega and for whatever reason he’s putting out a distressed scent and Tetsutetsu is reacting to it. He’s doing his best and it’s completely innocent but it seems he’s forcing himself on Kaminari without thinking. On his way over he calls up Aizawa to let him know the situation at hand and the other teacher groans in frustration since Bakugo and Kirishima had just left the auditorium a few minutes ago to go check on Kaminari.
Vlad hurries to his classroom and right when he opens the door he see’s the two he doesn’t want to see right now walking down the hall. He curses and tells Ibara to go stall them while he deals with the knucklehead. She nods and hurries to meet the two.
“Stop! The lord has instructed me to inform you of his will-” She starts and goes into a sermon about the will of the savior. The two look at her with confused looks and then glance to each other.
Vlad walks in and closes the door a little more harshly than he would have liked. That makes Tetsutetsu growl and bare his sharp teeth at his own teacher. He’s hunched over Kaminari protectively and he doesn’t seem ready to leave him. The blond is breathing heavily and shaking as he stares at Vlad wide eyed and pleading. The older man takes a breath and tries to let out his calming scent.
“Tetsu, it’s me. Don’t growl at your teacher. Kaminari is fine, let him go.”
“He’s not fine, he needs me.” Tetsutetsu snaps.
“He’s fine, you’re scaring him right now so you need to give him some space. You’re doing a great job as an alpha but right now he needs someone else.”
“I can comfort him!” Tetsutetsu snarls as if his pride has been damaged and he’s now even more upset and his scent is expelling his anger. Kaminari feels scared, the man over him is smelling really strong and scary and there’s a sinking feeling in his gut to be quiet and not move. He doesn’t want to be here, he doesn’t know what the hell is going on and why but he just wants Kirishima and Bakugo. The image of those two flash in his mind and his lower lip quivers until a whine erupts from his lips that’s sharper and more pathetic than any whine he’s ever made. Both men stop their glaring and look down at him, the urge to comfort Kaminari pulls them away from those feelings of anger and aggression. Vlad himself is distracted but makes no move forward so as not to get Tetsutetsu on the defensive again.
“Tetsutetsu, he’s not happy when you’re upset and you’re stressing him out. You got to-” Vlad pauses with the smell of two angry alpha scents seep into the room and he’s turning sharply at the door. He can hear Ibara trying to slow them down but she’s a smart beta and isn’t about to use her vines to stop them when they’re obviously this upset. The door is exploded open and the moment the two see Kaminari on the ground with Tetsutetsu on top of him they’re lunging for him. Vlad grabs them before they get to far and forces them back.
“Let go!” Bakugo snarls.
“Denki!” Kirishima yells and reaches his hand out for the other.
“G-Guys.” Kaminari says and he rolls on his side before trying to sit up but Tetsutetsu pulls him close against him as he glares at the other two. That doesn’t bode well and now the two boys are thrashing, and finally break free of Vlad’s hold. They’re storming forward and Tetsutetsu gets up and stands between them and Kaminari with teeth bared, there’s no hint of rational thought in any of them and Ibara uses her vines to sneakily move Kaminari away behind the teachers desk while they’re focused on each other. She’s hiding behind the desk as well and Kaminari looks at her with wide confused eyes.
“What the hell is happening?” He’s so confused but the angry alpha fumes are making his head spin.
“You presented as an omega, you seemed distressed so I’m guessing Tetsutetsu was trying to comfort you.”
“Huh? I-? Wait! What!?” She slaps her hand over his mouth and the two glance around the desk to see Vlad trying to hold the three from going at each other’s throats.
“You made a call earlier that had the alpha’s attention you need to do it again.” She says softly and he tilts his head not knowing what she’s referring to. “You need to call to them, a whine that will get them to put you first instead of fighting.”
“H-How the hell do I do that?” he whispers frantically and as a beta she has no clue on the how but she encourages him to try. Call to them, tell them he wants them to be by his side but with a whine… for some reason.
He moved so he was beside the desk instead of hiding behind it and he tried to just let instincts take control. He wanted Kirishima and Bakugo to come to him, he wanted them by his side and he wouldn’t be happy until they were. A low hum resonated in his chest and he looked to the two pleadingly as they broke out of Vlad’s hold once again and finally let that high pitch whine break through the tense atmosphere and the alpha’s ears all turned in his direction. Kirishima and Bakugo whipped their heads to look at him and their angry alpha scent finally died down. Vlad went to Tetsutetsu immediately and pulled him away before he could try to get to Kaminari and Ibara hurriedly followed after the two.
Kirishima and Bakugo hurried to Kaminari’s side, they all sat on the floor and the two alpha’s sneered at the scent of Tetsutetsu so prevalent all over the blond and were quick to start scenting him with their own.
“Are you okay?” Kirishima asked softly and Kaminari nodded.
“He didn’t touch you fuckin weird did he?” Bakugo asks but his tone is much more subdued.
“N-No.” Kaminari laughs a little. “He didn’t mean any harm.”
“Why was he all over you? What’s his problem?” Kirishima was sure Tetsutetsu didn’t have any interest in Kaminari so it made him wonder if he knew his friend at all.
“Well I- I started to smell like an omega.” Because he is an omega. “I was stressed out with the lights and then I guess I started to-” He stopped when he noticed the two pull away and stare at him, before digging their noses into his neck and inhaling deeply. Kirishima scooted downward and stuck his face into Kaminari’s crotch and inhaled which earned a jolt from the blond. “H-Hey!”
Kirishima pulled away, still looking baffled and he looked to Bakugo before looking back to Kaminari. “An omega.” He whispers before pulling Kaminari into a hug and nuzzles him. “You’re an omega.”
“Oi, don’t hog him.” Bakugo snaps and Kirishima with an apologetic smile lets go and Bakugo pulls Kaminari into his arms.
The blond is pouting but he notices the others are sharing okay right now. “You guys are okay with this? Me being an omega?”
“Huh?” Kirishima hooks his chin over Kaminari’s shoulder and nuzzles his neck. “Why wouldn’t we be?”
“I mean you guys are okay with sharing an omega! Isn’t that super unheard of!? You’re both alphas! Can you guys really do this?”
“Do what?” Bakguo asks grumpily, he’s not sure what these questions are all about.
“Have me as both your boyfriend!” How is this not sinking in for them? “Can you guys really share an omega!? What if I go into heat!? Are you guys going to try to kill each other to get at me!?”
The two alpha’s look at each other before smiling and nuzzling into Kaminari again. “We’re not going to kill each other, you’re not that hot sparky.” Bakugo says with a smirk and nips at the blond’s ear and tugs it. Kaminari gives a whine and pulls his head away.
“You’re plenty hot but we’re not going to lose control!” Kirishima specifies and Kaminari just pouts.
“Like earlier? You seemed about ready to kill Tetsutetsu a minute ago.”
“That was...we were trying to get to you and he wasn’t letting us! We wouldn’t kill him or anything!” Kirishima defends himself instantly and huffs at the accusation.
“Just would kick his ass and knock him out if he didn’t get out of the damn way. Fucking idiot. He’s your friend Kirishima tell him he’s not allowed anywhere near Kaminari if he knows what’s good for him!” Bakugo is glaring sharply at Kirishima and making explosions in one of his hands for emphasis. Bakugo is being lenient if it were up to him he’d go find that asshole this second and kick his ass for a warning but he’s matured enough to at least give someone a warning without violence first.
Kaminari is resting his head against Bakugo’s chest and he sighs softly. This messes things up a bit, they were young so controlling impulses was simply going to come with practice and experience. They should hopefully be able to react normally and calmly if a similar situation were to happen but there’s no telling how they’ll be for his first heat. Heats change things, they’d go into a rut and they’d lose control of themselves which means they could potentially hurt one another.
“Maybe, it’d be best if we break up.” Kaminari says softly and the two freeze for a second before huddling close to cuddle the smaller male.
“No, baby, no we don’t need to break up. Katsuki and I love each other and we’d never fight to hurt each other.”
“Drooly, don’t say stupid shit like that! We’re not animals! You think I’m stupid!?”
“But what if I can only mate with one of you guys? Not both?” He’s never heard of an omega with two mates or if it’s even possible. “I don’t want to mate with just one of you…”
Despite the seriousness of the conversation both alpha’s tails were wagging with excitement. Mates huh? They didn’t think they’d get to be mates with their dynamic which was fine by them but now that it’s possible there was a new level of eagerness. They’re gonna be mates, they’ll get to mate Kaminari and form an unbreakable bond with him and hell they might even have kids! Oh shit! Kids!
Both alpha’s exuded an extremely happy scent and Kaminari blinked a few times since he’s basically surrounded in a cocoon of their dizzying happiness and tugs at them both. “Hey! You’re not listening! What are you getting so excited about!? Only one of you might be able to mate with me, idiots! Isn’t that shitty!? That’ll ruin our relationship!”
“We’ll be fine drooly! Geez, stop worrying! We’ll figure a way to be your mate at the same time so stop smelling so damn scared!”
“Yeah!” Kirishima is smiling and damn even though Kaminari is trying to remind them of the negatives that are extremely plausible he can’t help but smile too. Damn, Kirishima’s infectious smile and Kaminari’s easily persuaded attitude. He supposes he can blame being an omega for that.
“I just don’t want things to change y’know! It’d totally suck if you two started fighting over me, if you guys got hurt because of me…”
“We’re not going to fight over you! We’re not fucking twelve and you’re a damn toy. Stop looking down on us.” Bakugo growls and although it’s to be intimidating he’s not putting his alpha scent behind it to really intimidate Kaminari so the smaller blond pouts and gives him a shove.
He gets up and walks away from the two but it’s not long until they’re trailing right behind him then right beside him. “You know we can’t make any promises, we can’t really control our instincts right now but I do- deep down want to share you with Bakugo. If we can be both your mates I’d like that the best and if not...I guess we don’t need to mate!” That would surely disappoint both alphas but they’d survive for the sake of their relationship.
“You’re really okay with that?” Kaminari asks and Kirishima nods and Bakugo gives a grunt which is as close to a yes as they’ll get.
So, that was the plan, all or nothing.