Thread by @dynadekuism

#bkdk #ktdk #dekussy 🔞 abo, o!izuku, a!katsuki, semibakubowl, heatsharing

Izuku knew at the age of thirteen, the moment Katsuki presented as an alpha, that his obsession over the blond would sky rocket.

He just didn't know that he would fight fangs and claws for it. Literally.

Another week has passed.  Class is getting more into actual training than indoor classes.

They're in the middle of quirk control training when someone slides beside Katsuki.

The scent of mint honey makes him crunches up his nose, but otherwise, he doesn't snap.

He doesn't want to piss one of Izuku's omega packs.

"So, why is that taint still alive?"

Katsuki chortles and gives Neito an amused look. "That's my question every night."

The omega clicks his tongue. "Izuku's too kind for this world. I would have given up my hero license to kill an omega for trying to fuck with what's mine."

Katsuki arches a brow. "Just for alpha? All that wasted for someone else?"

Neito shrugs. "It's not because of the rhetorical alpha. It's just a practice of an eye for an eye. A fang for a fang. Whatever a disgraceful omega gave me, I'll give back ten folds. I knew Izuku planned that to happen, he wanted Kirishima to know he won."

Neito gives Katsuki a sneer. "But Kirishima is also an omega. And crazy omegas don't just let another omega to one up them. So just know that Kirishim will definitely do something. Or he's still on shady stuff And Izuku is too mommyfied to think about that."

Katsuki smirks and shakes his head. "Dam instincts are so crazy. I never felt like killing someone just because someone got hurt. And that's me on sire instincts."

"Just be vigilant," Neito says with a wave of his hand. "Izuku can be easily manipulated at this point."

"Make sure Kirishima is away from him or else he's gonna act all dam again to him. He's supposed to be on pills for that."

Katsuki stops from blowing up a ten feet rock and turns to Neito, frowning. "Who? Izuku?"

Neito rolls his eyes like he's some dumb alpha, and waves his hand again. "When omegas have dynamical pheromones, they are always given a neutralizer to avoid triggering instincts from people around. With Izuku newly mated and fertile like that?"

"Kirishima should be on pills since he's gonna trigger Izuku's dam instincts."

Katsuki furrows his brows and gives the omega a contemplating look.  Then, he speaks.

"But if that's the case, shouldn't everyone take that neutralizer to avoid triggering Izuku's instincts?"

"He reacted like that with Kirishima only."

"Do you even listen to what I said?  Only Kirishima has dynamical pheromones. Your other classmates are fine. Just remember that regardless of whether Kirishima takes those pills or not, Izuku will hyperfocus on him."

Neito then touches his forearm in one swift tap. "Imagine what would happen if he's not taking those? Recovery Girl must have given him that. Or she's a fraud, if she happens to not do that."

And with that, Neito blasted himself away, using Katsuki's quirk.

Katsuki stares at the smoke left from Neito's usage of his quirk. Then he turns to look around and search for his mate. The sudden urge to be with Izuku skyrockets just from the thought of someone else harming the omega.

Katsuki knows deep inside, Izuku can take care of himself.

Izuku is single-handedly one of the strongest students in this school, even if teachers are included. But Katsuki, despite being superb at controlling his alphan instincts, can't just ignore his bond with Izuku.

It's calling out to him, even if Izuku is safe and giggling with

Ochako and Denki when Ohjiro accidentally tripped on Hanta's tape.

Katsuki abandons the rocks he's been training with and strides to where Izuku is.

His omega is safe. But why does his instinct to protect is at an unsettling amount after his conversation with Neito?

He knows better than to trust Kirishima, but he's not actively assuming or expecting for the red-haired omega to just go crazy and attack them. He thinks only an idiot would do that.

But now that he's thought of it, there's always a possibility. And not just possibilities.

Because he's certain that Kirishima is capable of doing the most disturbing thing, he could plan to trap an alpha into mating.

Suddenly, he's filled with anger. Anger that someone dares to put this much pressure on Izuku when the omega should be in peace right after mating.

Katsuki doesn't care that Aizawa and their classmates are around, he just snatches the omega from his crowd of omega pack.

"Kacchan!" Izuku gasps, but doesn't protest that Katsuki is pulling him away from their classmates.

When they're a good distance away from the class, Katsuki is quick to pull the yellow scarves around Izuku to look at his mate's claiming bite.

Izuku leans in, eyes staring and searching. His scent became concerned.

"Kacchan, what's going on?"

He doesn't answer.

Instead, he pulls the omega close to him and wraps his arms around Izuku, trapping the omega's arms that Izuku is not even able to reciprocate the hug.

"Katsuki, what's wrong?"

KatsukI closes his eyes tight and nuzzles the omega's hair, not minding that his back hurts from

bowing a little to accommodate Izuku's height.

"Don't be hurt," he mumbles, trying to tamper the anger he feels from that conversation with Neito. "Fuck, promise me you won't get hurt. If I'm not allowed to guard you all day, then please don't be hurt."

"Kacchan.."

Izuku wriggles out of his embrace, and he almost panics that he may have freaked Izuku out from his overbearing attitude but instead, Izuku hugs him in the middle tight.

"Kacchan, you won't let anything bad happen to me," the omega whispers to him. "I have me. And I have you."

Katsuki sighs and sinks down further, until his face is near Izuku's claimed glands and he inhales deeply, relieved at the scent of his mate's pheromones.

Their embrace got too long, for Hanta groans loudly enough for the whole gym to hear.

"We get it! You're mated! You two can sneak out under Sensei's nose! You're gonna get married right out of highschool!" Hanta protests, which earns him a loud smack on the nape from Denki.

"Let them! They've been fucked over by a bitch omega, you shut up!"

Everyone laughs it off, though Kirishima takes a few steps back with a grimace, pulling out from his sparring session with Koda.

Katsuki doesn't say anything, which tells Izuku something now that his mate

is not yelling at their classmates. Katsuki is really worried and the strong hatred in his alphan pheromones is making Izuku anxious.

All of these are being observed by a pair of light indigo eyes.

Silent. Contemplating.

•••

Yuga has been walking back and forth in his room, lips pursed and palm hurting from gripping deep brown blister pockets of omegan pills.

They're neutralizers which he found in his trash bin, and they're not his.

He may not be mated, but he has a stable dynamic for pheromones.

He doesn't need pheromone neutralizers.

And he knows whose these pills are. It's not like he has other people in his place for Denki and Ochako host the omega pack nesting.

He only had Kirishima few times in his place. And he's certain only Kirishima can have this kind of pill.

Yuga whines and stomps his foot on the ground.

"Why is he messing with me? Does he know I'm pulling him away from the pack?" He whines to himself and then slumps on his bed. "Why can't he just move on?! He's so annoying!"

Is his effort backfiring?

He just wants Izuku to have a peaceful life, after that shitshow of omegas trying to mate his chosen alpha prior to his mating with Bakugou.

And after mating, he thought things would smooth out. For a moment, it does feel like it, when Denki and Ochako seem to be supportive.

That is, until Kirishima came back from his heat.

Now, Yuga is thinking, how is he going to tell Izuku about this if the omega is literally living on the other side of the wall.

It is supposed to be easy, since they're just a wall away from each other,

but he can't find the time because Kirishima is always there and he's busy tolerating the red haired omega so Kirishima won't pester the other omegas in the class.

Yuga has been receiving thank yous because of that. Just shows how their classmates don't like Kirishima anymore.

He's just about to put the medicine back in his vanity's drawer when suddenly there are knocks on his door.

Yuga halts from pulling his drawer open, and contemplates if he's going to hide the pills. And suddenly, he thinks it's a good idea to just confront Kirishima about it.

It's not like he's scared of the other omega, anyways.

He quickly takes a scissor first, and cuts the pocket in half. Just in case, he thinks.

When he opens his door, just like he expected, it's Kirishima; beaming and smiling at him bashfully.

Yuga doesn't say anything and opens the door wider, letting Kirishima in.

"Hey," the omega beams and drops on the nest on the floor. "How was your day? Training was so hard! And I have to meet Recovery Girl–"

Yuga drops the half blister pocket in front of Kirishima.

The red haired omega immediately shut up.

"Why are you throwing your pills in my bin?"

Kirishima frowns at him. "Those aren't mine."

"You're the only omega I let come in here."

Kirishima arches a brow. "It could be Tsuyu's."

Yuga huffs and crosses his arms.

"I don't let others enter here. Only you. And I know you know that too, since your nose is completely fine to smell if I had visitors or not. Those pills are yours."

Kirishima quickly takes the blister of pills. Yuga internally thanks himself that he cut the medicine into half.

"Please, don't tell Midoriya!" Kirishima almost yells, and immediately covers his mouth upon realizing who is Yuga's neighboring room.

Kirishima scrambles to stand up and holds Yuga by the forearms, the blond omega wincing at the hardened palms trapping him.

"You're hurting me!" Yuga whines.

Kirishima lets go and grimaces. "I didn't know you'd find it.."

"It was in my trash."

The red haired omega sighs in exasperation. "I just wanna get rid of it. I don't want to take it."

Yuga frowns. "You don't have a say, you have to take it."

Kirishima purses his lips and stares at him. "You're an omega. You should understand that I don't like my pheromones neutralized just for other people's convenience."

Yuga stares at the other omega.

He wonders where Kirishima gets the idea that he has a say and right to decline a nurse's words with the problem he caused.

For other people's convenience, huh? Yuga thinks. For other people's comfort.

Eventually, he sighs then nods.

"Okay," he relents, and smiles timidly when Kirishima beams at him again. "I won't tell Izuku. I promise."

Kirishima starts at him, challenging and full of warped belief. "You swear?"

Yuga nods slowly. "Swear."

Then, Kirishima shows his wrist.

Yuga's eyes widen. Kirishima wants to form a pack promise?

"Promise me you won't tell Midoriya."

See? Yuga knows the feeling when someone is just petty and when someone is a villain with emotions. He knows, he was a spy villain before Izuku became his best friend.

And there's the worst type of villain. Those who don't feel remorse, those who can manipulate themselves to feel sorry even if the truth is they're not. The worst kind are those who know they are cornered, but still cunning.

Yuga knows, because he had few direct contacts with the possible worst villain in the history.

He thought he would never feel terrified again. But he's wrong.

Red blood eyes almost slits, Kirishima is waiting for his own wrist to meet and touch their glands to seal an oath.

Yuga gulps and slowly puts his wrist glands to Kirishima's, sealing the vow.

"I vow to not tell Midoriya of what I've found."

Kirishima stares at him, concentrating,  until he sighs in relief. He smiles warmly at Yuga.

His spine shudders at how genuine the smile looks.

"Thank you, Yuga."

An oath is meant to be kept. Secrets should be kept, promised to not be heard by the subject.

And Yuga does not break promises.

Kirishima is not as thorough with his oath, though.

That's what Yuga thinks as he stands outside of Katsuki's door room.

He vowed to not tell Izuku.

And he didn't promise anything about keeping the secret from Katsuki.

With a new-found courage, Yuga knocks on the door.

••

tbc

hi 👉👈 next update will be the last one,,,, probably 😩👉👈

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hello, guys 👉👈 let's go with the last update of this fic! there'll be time gaps updating to avoid twtl¡m¡t 👉👈

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(my account is public so feel free to qrt, they're precious to me 💚👉👈😩)

Katsuki spent the whole day glaring at everyone who tried to talk to him. His irritation just seems to not fade, even after scenting Izuku and his attempt to ignore Hanta's and Shoto's jabs about his presumably incoming rut.

But Katsuki knows he's not rutting. If he is, Izuku would be suffering from pre-heat. Since they're mated and their heat's and ruts should be in sync already. But Izuku's not in pre-heat.

Plus, they just mated. It's impossible to be in heat right now.

So he's not in pre-rut. He's just stopping himself from killing someone.

Katsuki clicks his tongue and shuffles in his bed, turning to his side and glares on the wall.

He knows Kirishima is not in his room, he barely is.

He always stays at Aoyama's since Izuku spends time in Katsuki's room every night.

But tonight, Izuku is in Denki's room for their weekly nesting. Meaning, there's a chance that Kirishima will be in his room.

It's just a wall separating them.

Suddenly, Katsuki's fangs start to ache. He growls and inhales his blanket that smells too much like Izuku. He needs to calm himself down, or else he will ambush Kirishima in his own room and just kill him.

Katsuki takes his phone and about to send a message to Izuku

and just beg his omega to scent him when suddenly, there's a series of knocks on his door.

Katsuki frowns, because he knows it's not Izuku. his mate doesn't knock anymore, which is a development that Katsuki may or may not love.

With a frown, because it's almost midnight now and who the hell would dare knock on Katsuki's door at this hour, the alpha gets up and strides to his door and opens it.

He somehow expects Kirishima, because that fucker is obviously unhinged in the head at this point.

What he doesn't expect is Aoyama, who looks nervous and also determined at the same time.

Immediately, Katsuki's hackle rises and it's not because Aoyama is an omega, knocking on a mated alpha's door.

It's because Katsuki knows that the omega is practically the only one who

tolerates Kirishima for the sake of Izuku.

And he's extremely loyal to Izuku, Katsuki just knows. Even if Aoyama somehow did Katsuki wrong in their first year for helping construct his kidnapping, Aoyama had proved himself worthy of trust.

He's nothing like Kirishima at all.

"What?" Katsuki asks, trying his best to not sound so snappy.

Aoyama grimaces. Then, pulls the silk night cap off from his head.

Katsuki scowls and about to growl at the omega when he notices that Aoyama pats his head, like he's looking for something.

Then he digs a hand inside his nightcap.

Aoyama then pulls his hand out, and there, an unfamiliar blister pocket in his hand.

"Kirishima threw this in my trash bin over a week ago. I waited to confront him first before I decided to tell you."

Katsuki looks at the medicine with a frown and then he looks at Aoyama again.

"Why didn't you tell Izuku?" He asks.

Aoyama winces. "He made me bind a vow to not tell Izuku. He's stupid, though, because I have the option to tell others. You're obviously the right choice."

Aoyama then nudges the pocket of pills towards him. "I cut the pocket in half. Just in case he decides to take the pills away from me. Which he did, so there. You can ask Recovery Girl about this.."

Katsuki tentatively takes the pills, eyes still staring at Aoyama.

The omega's obviously afraid, being involved again in a situation. But he must be feeling bad for Izuku, and now he snapped. He also probably had hoped that Kirishima just dropped the pills in his trash bin.

If there's someone who would give evil a chance, it's not Izuku.

It's Aoyama. For he was in a situation that forced him to do stuff he didn't want to.

He must've thought Kirishima is the same, being a slave of his own instinct. Whatever Kirishima said probably cemented Aoyama's benefit of doubt for him and now the omega doesn't

have a choice but to come to him.

Katsuki can't believe this is the same omega he refused to provide for because of their history together.

This time, Katsuki will have no exceptions. This time, Katsuki will set aside the fact that he got kidnapped because of this person.

Because Aoyama is doing things that are not even his responsibility.

But his loyalty towards Izuku is something Katsuki will respect.

"Come here," Katsuki mumbles.

The omega suddenly raises his head, eyes wide and looking shocked.

"What?" Aoyama asks dumbfoundedly.

Katsuki rolls his eyes and pulls the omega closer, and then he embraces Aoyama and pats the omega's head.

"You did good. And don't you ever feel guilty that you did this behind that fucker's back. He was only with you 'cause he had no choice and you don't fucking deserve that."

Katsuki then pushes Aoyama and turns the omega's body around. He pats the omega's back.

"Now, go to Denki's nesting night out and enjoy, you should be with omegas that don't see you as a last resort."

Aoyama looks petrified than grateful, clutching his nightcap in his chest.

"What the hell did I do?" Aoyama mumbles as he walks away.

Katsuki watches as the omega enters the elevator, the pills now in his hand.

When Aoyama's gone, Katsuki takes a look at the blister pocket. He squints at the description at the back.

"750 milligrams.." Katsuki mumbles to himself, horrified at the dosage.

There's no way that this is not Kirishima's, considering the omega's medication history.

Katsuki enters his room again, not bothering to lock the door knowing Izuku will come barge in any second.

If Aoyama follows through his words, that is.

Just like Katsuki thought, his door opens not even a minute, his mate frowning when Izuku walks to him.

"Yuga said you hugged him," Izuku says, worried. "What happened? You're not scaring him on purpose, are you?"

Katsuki rolls his

eyes and pulls Izuku near him. And then, he shows the pills.

"Kirishima's not taking his medicine. And before you start defending him, Monoma told me about these kinds of pills. It's mandatory to take these if his pheromones are on a riot. Especially around a newly mated omega."

Izuku gapes, and takes the medicine. The omega stares at the description at the back. And his eyes widened.

"This is.. Kacchan, 750 is insane! Why did Recovery Girl give him this?!"

Katsuki snorts.

"Probably because fucker's unhinged at this point? He needs that much, but clearly he's not taking them. Look at how you reacted to him."

Izuku puts the medicine on Katsuki's hand. "Keep it. Let's talk to sensei tomorrow."

The alpha shrugs and nods.

Then, "Are you going back to your pack?"

Izuku gives the alpha a pout. "Yeah. I miss them. I spend too much time with you and I need fresh air."

Katsuki huffs and crosses his arms with a scowl, not letting those words hurt him.

"Okay. I'll see you in the morning."

Izuku beams and kisses him on the cheek. Then Izuku dashes out of his room.

Katsuki sighs. Instead of feeling lonely, the alpha thinks about the medicine instead.

It seems like he needs another conversation with Kirishima.

•••

The next day, Katsuki's fidgeting from the moment he made breakfast to the first class of the day. It got to the point that even Ochako asked him to calm down. And she's not even the person who should tell him that, the omega being hyper for her own good.

He's calm.

He's not even yelling at their friends. He's just scowling and only letting Izuku near him, ignoring every attempt of their classmates' to talk to him.

It doesn't help that Aizawa's watching him, frowning and calculating.

And then, the bell rings.

Katsuki doesn't wait much longer and stalks to Aizawa right after the class, tugging Izuku behind him.

They haven't even reached the teacher and Aizawa is already sighing.

"What?"

Katsuki pulls out the blister pocket out of his slacks and puts the medicine on Aizawa's desk.

"Kirishima's not taking his neutralizers. Aoyama saw this in his trash bin."

The teacher stares at the medicine for a moment, and then he's pursing his lips and pinching his nose bridge.

"If we only expelled him, we wouldn't worry much more."

Izuku huffs. "Sorry for crediting his heroic stats, then."

Katsuki elbows his mate. "Not your fault."

Aizawa takes the pills and stands up. "Let's go to Recovery Girl. We have to check if these are Kirishima's."

Katsuki's about to protest when Izuku pulls him back.

Aizawa stares at them hard. "We need proof, so when you go off to him, we won't have to explain the lack of evidence."

Izuku frowns. "Go off? What do you mean?"

The teacher beckons them to go first to go out of the room and Aizawa follows them outside.

"You two are mated. If one of you decides to do something horrible, you can use that alibi and get away with everything. Only if your mate is in harm's way, that is," Aizawa explains while closing the door.

"Oh.. We didn't know that," Izuku says, frowning.

"I just know it can be used as a reason, but I didn't know mated status is an immediate clearance of conviction."

"Well, you'll know before graduation. It'll be in the last seminar. Hero Commission Law number 1042 of the Marital and Commitment Section."

Katsuki could care less about that, he can easily ace that test. But now that he's involved, he can't help but take that into heart.

If he's allowed to punch Kirishima, he's gonna make the most out of it.

They reach Recovery Girl's clinic and Aizawa knocks, doesn't bother

waiting for a response and opens the door.

The nurse takes one look at them and she's already tired, almost identical to Aizawa's reaction earlier.

"What happened this time?" The nurse asks.

Aizawa nods at the chair and Katsuki pulls Izuku with him, both of them sitting as

Aizawa puts the medicine on Recovery Girl's desk.

"Bakugou reported to me. Aoyama gave him these pills, which they assume are Kirishima's. We just need confirmation if it's Kirishima's or not."

Recovery Girl sighs and takes the blister pocket. Meanwhile, Izuku is frowning.

"How do you know it's Kirishima's? It could be anyone's.."

Recovery Girl turns to him. "These pills are prescribed with reference numbers physically printed on the pocket. So we'll know if this is his."

Izuku perks up. "Oh! That's clever! Oh… so if it's his, what then?"

The nurse shrugs. "Then I'll submit a compliance report to the principal's office for another conduct violation. I'm afraid he'll be expelled this time, Midoriya."

Recovery Girl then puts the blister pocket on the scanner. Few seconds and green light lights up on a button.

Both Izuku and Katsuki frown as Recovery Girl prints a paper with a series of numbers.

Izuku is so curious.

"What now?"

The nurse clipped the paper on a wooden board.

"It's his. Same serial numbers. And even if there's no serial numbers, I know these are Kirishima's. I never give 750 milligrams of neutralizers to others. Only to him."

Katsuki exhales loudly and curls his hands. "So he's not taking them."

"If he's throwing them shits on other people's trash bin."

The nurse nods. "That is more likely." Recovery Girl exhales, her heaving is a motion of finality. "I need to report this to Principal Nezu."

Katsuki frowns and turns to Izuku, the omega also frowning, biting his thumb.

Katsuki clicks his tongue and pulls the hand down, Izuku blinking in surprise and smiles bashfully at him.

"Sorry, Kacchan.."

Katsuki only hums and then stands up, pulling Izuku with him.

"We're leaving."

Katsuki doesn't wait for a response and pulls the omega with him, scowling at every student that looks at them.

Izuku slaps his chest.

"The fuck?" Katsuki hisses, catching Izuku's hand. "What the hell?"

"You're glaring at them!"

Katsuki looks away.

"You can't blame me. I want to kill that bastard and I'm not allowed to."

Izuku sighs and hugs the alpha's arm, both of them just walking.

"Are we having lunch? I'm still full from that breakfast you made earlier," Izuku says as they enter the cafeteria. "You wanna eat?"

Katsuki scoffs. "Nah. I wanna kill."

Izuku ignores that and they go to their friends' table.

The day passed by with no eventful happening. They skim through class after class, and then the class day ends just like that.

Katsuki wants to train with Izuku, since he's been training with Denki a lot these days to see if electricity would detonate his gauntlets.

They're in the middle of talking about the rules of sparring as Tenya shouts about combat protocol,

when Aizawa enters the gym.

And then, he speaks. All omegan command in his voice.

"Bakugou. Midoriya. Kirishima," Aizawa calls out, commanding and with no room to talk, and juts his chin. "To Principal Nezu's office. Now."