#Bkdk #TdDk #DkBk #DkTd #angst(? A/B/O A!Dk O!Bk O!Td Throughout...

@unfanmas123
Tam?@unfanmas123
23 views Aug 05, 2026 ~21 min read
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#Bkdk #TdDk #DkBk #DkTd #angst(? A/B/O A!Dk O!Bk O!Td

Throughout his life, Katsuki had made many bad decisions.

but the worst of all was definitely rejecting Deku in his last year of middle school.

...

Katsuki knew that he was born destined for success.
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He knew he was going to be the best damn hero of all.

and presenting himself as an omega wasn't going to stop him.

Katsuki was more than just an omega. even his inner omega knew it. The little thing was a proud beast, who hated everyone's stinking smell.
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of everyone except that of the useless Deku.

Katsuki felt personally offended when Deku came to class reeking of spicy mint. No one would have ever imagined that the useless would be an alpha. but there he was

and Katsuki's omega loved him.
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Of course, Katsuki had done everything in his power to keep the alpha away. He had doubled down and doubled the harassment and mistreatment of Deku.

but nothing seemed to stop him.

The son of a bitch had even had the balls to ask him to court him.
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He had shown up at his house, armed with a scented blanket, flowers, and his UA acceptance letter to prove he was worthy.

That made Katsuki even more angry.

The little shit had entered the UA, not the hero course, but the support course
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Deku's plan was to enter the hero course in the same way that Eraserhead had done years ago: with the UA festival.

Katsuki, ignoring his omega's coos, cried out for the alpha, and took his gifts and made them explode in front of his eyes.
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Katsuki doesn't remember what he said to Deku. but it was enough for the alpha to show up to class with a thick collar and scent patches.

Katsuki didn't care how much his omega begged him to apologize.

...

the first time Katsuki felt a hint of regret
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Was when he saw Deku again at the festival of the UA

when he saw Deku fighting the damned Todoroki Shoto in the semi-finals

Todoroki was the only omega in the hero course besides Katsuki himself.

He was also the only one Katsuki recognized as an equal, in terms of power.
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Deku had arrived at the Arena armed with support items like Aizawa and a fucking layer of lean muscle.

and he had achieved what no one had achieved until that moment or since: that Todoroki used all his power.

when Katsuki saw the way half and half looked at deku
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and the way Deku looked at the other omega, as if entranced by such a pure demonstration of strength and power.

At that moment he felt something tighten in his chest.

The only person Deku had looked at like that was Katsuki. and now he was looking at someone else.
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His omega squirmed inside him, hissing with envy at Shoto and anger at Katsuki

When he saw Deku fall, he couldn't help but feel a twisted pleasure at seeing that he was still weak.

(It didn't matter that he had reached the last round of the festival, nor that he had beaten Iida
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and the girl with vines for hair. Deku was weak.)

but the pleasure did not last long, when he saw Half and Half approaching with concern to see if Deku was okay.

And if someone related Katsuki's fury when fighting Todoroki to what had happened in the fight with Deku,
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Katsuki would say they were crazy.

Katsuki was furious because Todoroki refused to use his fire, not because of the way he and Deku had looked at each other.

...

After the festival, Deku manages to enter the hero course.

and Katsuki hates seeing how well he adjusts.
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he hates it, because it completely refutes Katsuki's argument that Deku doesn't belong there.

and if Deku belongs there, it means that Katsuki tormented him for no reason.

He sees Deku laughing with Round Cheeks and the Frog Girl, and anger burns in his mind.
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He sees him in combat, using pure brute force and support elements, and thinks "I screwed up"

He sees him in the rescue exercises and notices it, which he always refused to accept. sees it. the hero in Deku
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He sees how Deku gives advice to Kaminari on how to handle his quirk, he sees how he examines Aoyama's support belt while offering improvements and in his head a voice says over and over again "you were wrong."

See how Deku is part of 1A and he can only think
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How different would everything be if, instead of kicking him at every step, Katsuki had helped Deku?

What would everything be like if he had stopped others from attacking Deku?

What would everything be like if he had accepted...?

No.

No, he can't go back in time.
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But he can try to fix things.

Katsuki pretends his omega isn't purring as he imagines the possibilities.

...

The second time Katsuki regrets rejecting Deku is when he sees him interact with Todoroki after the internship.

while Katsuki spent a week getting his hair done.
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Deku and Todoroki had fought in Hosu.

Aizawa, who had taken Deku under his care after seeing him fight quirklessly, had taken him to fight in Hosu.

where they met the hero killer.

no one knows what really happened there.

But when they returned, Deku and Todoroki seemed to
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Be joined at the hip.

and yes, Katsuki was envious. because while all he had with Deku were small anodyne conversations, Deku and Todoroki seemed more united than ever.

and his omega hissed furiously when he saw that another omega, just as worthy as him, was stealing Deku
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If Katsuki hadn't been a pretentious jerk, he could have been the one sharing secrets with Deku.

Maybe he could enjoy the refreshing smell of mint stinging his nose.

But Deku hadn't stopped using patches since that day.
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in the end, Katsuki feels regretful when he hears the end of the childhood nickname he had been called for 10 years.

and he realizes that he is not talking to him

"Good luck in the exam Shocchan!"

because deku stopped calling him Kacchan a long time ago.
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and he feels that a part inside him suffers when he hears such an affectionate nickname (because now he knows it's not condescending, It's not a joke, it's affection) that is not directed at him, but at another omega.

They fight All Migth. and they win.
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They work together and win.

And Katsuki can't help but feel like it's a step in the right direction.

...

The third time Katsuki regrets rejecting Deku is when they are at summer camp.

He had felt a little furious when he saw Deku sitting next to Half and Half on the bus.
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and he felt that anger grow when he saw Deku fall asleep with his head resting on the omega's shoulder.

Fucking intimate. fucking close to each other's glands

It wasn't even romantic, it was just a gesture of trust between members of a pack

but Katsuki hated it

(TWEET LIMIT)
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He hated seeing Deku form a pack that he wasn't a part of

(a part of his brain reminds him how hypocritical he is, since he never tried or let Deku be part of his childhood pack)

and seeing how Deku slept peacefully surrounded by the smell of an omega that wasn't him, it burned
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and the looks that Todoroki gave him, as if daring him to try to separate them, those burned twice as much.

Nothing burns as much as seeing Deku's reaction when the camp is attacked.

The villains are many, but they are more
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They end up injured, but they don't manage to take anyone

Deku has a shattered arm, and cries profusely when he sees that none of the members of his small pack had been seriously injured.

and sighs with relief when he notices that no one in the class suffered major injuries.
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Katsuki doesn't know what category he falls into. He doesn't want to ask.

His omega, the pathetic thing, hoots with joy when Deku cups his face in his hands and asks if he's okay.

Katsuki knows they are his alpha instincts. He knows this because Kirishima and Momo also asked
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He the same thing

him and Todoroki

but the omega still celebrates

until that night. long after curfew, when everyone is asleep, he sees Deku and Todoroki awake.

Katsuki watches them from afar

and that ridiculous joy that burned in him
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He turns off cruelly and quickly when he sees how Deku hugs and... and smells Half and Half.

Katsuki knows, and tells himself over and over, that it's because they are packmates.

Kirishima,as alpha head of the pack, tries to smell Katsuki to.
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but seeing how Deku smells the other omega, it hurts so fucking much.

...
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(dramatic little cut because I have to rinse a product out of my hair, I should have washed it 20 minutes ago)
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Katsuki deeply regrets it again after the hero license exam.

failure. at least Todoroki too.

but not Deku. Deku just got his license, and he's on his way to being everything Katsuki told him he couldn't be.

that night, he tells deku to follow him.
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Ever since they moved into the UA quarters, Katsuki felt the tension in him only increase. Seeing Deku interact, not only with his small pack, but with everyone was driving him crazy.

Deku didn't ignore him, but he treated him with the same cordiality with which you treat
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Someone you just meet.

and deku had known katsuki for 10 damn years.

Katsuki knows it's his fault, but damn, he's trying, why can't Deku do his part?

and since he was never good with words, he did what he knew best. lashed out.
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He yelled at Deku, attacking him. I accuse him of belittling him and ignoring him

"Now that you have another damn prettier omega, am I no longer enough for you? Am I not worth it anymore?"

If Katsuki was honest with himself, he had no idea where half of the things he said came
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From.

He knew he was furious, and he knew he wanted answers. He wanted Deku to stop ignoring him and he wanted Deku to look at him again like before.

but as Deku only defended himself against his attacks, without countering them or trying to stop him, his expression became more
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And more confused.

and that irritated Katsuki a lot.

"Stop looking so confused, I saw you and damn Half and Half, at camp. I saw you today. I saw you smell it, when you just asked me if I was fucking okay. Do you think you were too good for me?"
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and that brought a reaction.

The freckled man's confused expression transformed, first into a furious one, and then into one that seemed sad.

"What the fuck Katsuki, you-you said that, when I. you said- . when I ask you if.

the alpha takes a deep breath
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and it seems that he is trying to accommodate his ideas.

"A year ago, when I asked you if you would let me co-court you, you said-you said that you would never accept an alpha as pathetic and useless as me, who had such an unpleasant smell."
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"You said that no one would ever accept having to spend their life with someone who smelled like me. And now, you ask me why I didn't smell you??"

Katsuki stiffens.

The blonde had immediately forgotten the words he had said to him.
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He didn't remember saying anything like that to him, but but that explained a lot of things.

shit. SHIT. He had to fix it.

He had screwed up big time, and he hadn't even registered it.

"you said that you hated me and that you didn't want anything from me and
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"I LIE"

"What?"

Deku's green eyes were staring at him, but Katsuki couldn't keep his gaze.

"I lied. I don't hate your smell"

"So-then why would you say that?"

The voice sounded somewhat broken and watery, and Katsuki responded with a whisper.
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"I don't know, I just- you were always after me, saying that you could be a hero despite having no quirks, like you were better than me, looking down on me. and then you presented yourself as an alpha, just you, and I He was an omega, and it felt like you now had a new reason to
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Feel superior. "And when you showed up at my house asking if you could court me, it felt like a slap in the face."

Izuku does nothing but look at him, as if he had to process every word

finally says:

"I... I never looked down on you. You were always an example to follow for me
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You were the image of what I wanted to be..."

"I know now. I know you didn't...I, I started going to therapy as a condition of staying at the UA. and...it helps a lot"

Now they are both sitting on the ground of Ground beta

looking anywhere but at the other
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Finally, Katsuki breaks the silence.

"I'm sorry about everything"

and he feels it. for everything that could be and is not.

and Izuku answers

"me too "

...
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After that, things between them change.

They don't become best friends, nor does Izuku begin to smell him, nor do they become a pack.

but they are on their way to being something

They are no longer strangers

but it's not even close to what Katsuki realized he wants
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Katsuki no longer counts how many times he regrets rejecting Izuku.

but he can still highlight specific moments.

...

Izuku returns from his first day of internship with a little girl wrapped around his waist

Eri is her name.

and behind Deku are Aizawa, Mirio and Sir NightEye
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Deku and Mirio, during their internship, were approached by Eri. and when supposed father wanted to take her, Deku had done something unheard of.

had used an alpha voice.

the alpha voice was a myth. extinct by the time the quirks appeared.

it made sense that deku, being
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quirkless, being something prior to the last evolution, could use it.

and with his alpha voice, the beta who claimed to be Eri's father, couldn't do anything. When Deku ordered him to stop, he went numb, catatonic.

and that's how they captured Overhaul. without resistance.
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but the voice only appeared with an extreme protective instinct for the little girl.

and now deku refused to separate from her. and she refused to leave him.

And he didn't let anyone get close either.

until Todoroki Shoto arrived from his remedial classes.
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Katsuki and Shoto arrived together, and they both felt something strange.

something primordial and instinctive, roaring in the depths of both.

and when they tried to approach Deku, the alpha only allowed the omega of his pack to approach.
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For the next three days, until Deku's instincts calmed down, Deku didn't let anyone other than Shoto get close to him or the girl.

and seeing the alpha and omega with a puppy destroyed Katsuki's omega.

That could have been him.
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It was at that moment that Katsuki realized that he was no longer fighting to be part of Deku's life again.

He had to fight for Deku. against Todoroki.

Until Deku was courting one of them, the game wasn't over.

...
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Tbc

I'll be back in a couple of hours, this isn't going to be very long.

Like, comments, retweets and followers are very welcome

If you want, you can support me in ko-fi

ko-fi.com/tam5304
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sorry for the wait, I got distracted reading a fanfic hahahaha

Let's continue with this.

...
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Katsuki tries, and tries with all his might. but nothing seems to matter. It's like Deku is something intangible to him

Deku doesn't ignore it, far from it. Now they are something like friends
They train together, they study together, but Deku doesn't seem to see him as an omega
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and Katsuki doesn't know how to remedy that. He doesn't even know what he did to make Deku want him the first time.

Katsuki was never a soft or sweet omega. He never saw himself as a prototypical omega.

but Shoto wasn't one of those either... right?
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Still, Katsuki feels that, no matter what he does, Deku is getting further out of his reach.

and he can only continue regretting being an idiot

If I hadn't rejected Deku, this wouldn't be happening.
...

The first time Katsuki realizes that he is finally losing Deku is during
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his internships with Endeavor.

Katsuki had noticed it all day. Every time the eldest Todoroki approached them, Deku stood up straight and positioned himself between the hero and his son.

and he never took his eyes off him.

as if he was waiting for something.
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and at night when they are invited to eat at his house, Deku sits between Enji and Shoto

like he was trying to keep the older alpha away...

...like he was doing everything he could to keep his omega away from other alphas

(Katsuki remembers that conversation that he should
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never have listened. the blonde knows that Todoroki's mother is an omega. and he knows what Endeavor did to her. But that doesn't mean that seeing the alpha protect another omega like that hurts any less.)

...

The next time Katsuki feels that Deku is unreachable to him
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It's when they are in their second year, and there are only a few days left until Deku's rut.

At the beginning of his second year, Katsuki had tried a different perspective to get Deku's attention.

He had started to prepare small appetizers for him
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(and for everyone, because Katsuki couldn't stand Deku rejecting something he made especially for him. So he started doing little things in general. And if they were specifically Deku's favorite foods, well, no one had to know.)

but the alpha seemed unable to notice the meaning
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Of those details.

because every time Katsuki prepared something, a couple of days later Deku prepared something to reciprocate.

each. damned. time.

making Katsuki's crowd look like nothing more than a mere exchange.

and when there were a few days left until his heat, Katsuki
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asked Deku for clothes.

(Katsuki really wanted Deku's clothes in his damn nest. But he didn't feel that their relationship was that close. So, to hide his desire, he also asked the rest of his pack for clothes.)

At the end of the day, it seemed like Katsuki was doing nothing
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but sabotage himself.

And then, came Deku's rut.

and he did not ask for any clothing from him.

and he didn't seem to have asked anyone for anything.

but during the 7 days that his heat lasted, Todoroki attended classes with shirts that were not white.
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and when they were in the common areas, he appeared with t-shirts that seemed to have never been worn. as if all his usual clothes had disappeared.

...just to reappear 7 days later.

and Katsuki wasn't stupid

He knew what the end of this was.
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Katsuki had watched enough romantic shows to know what the ending would be.

But damn if it didn't hurt to see that he was just a supporting character in someone else's romantic story.

when he could have been the protagonist.
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Sometimes he dreams about what everything would be like if he hadn't rejected Deku.

They probably would have courted for a few years.

they would spend hours and hours together

They would have graduated together, they would have moved in together.
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Sometimes, when the darkness of his room swallows him up, he thinks about what his first time with Deku would have been like. He wonders what it would be like to wake up surrounded by the freshness of mint.

But he can still try...right?

...
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Katsuki redoubles his efforts.

He spends more time with Deku, cooks for him more. without offering anything to others. (but still, deku returns the favor)

He invites Deku to the movies, but Deku turns it into a group outing.

They train together, and to their shame, Katsuki
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try to promote contact, but deku ignores him and praises his new moves.

One day he brings coffee, tea and sandwiches to the workshops where he makes his support articles.

but deku thanks him and tells him that he just ate

He throws his dignity to the ground and asks
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If he wants to watch old All Might movies in his room, and Deku tells him that that would be inappropriate, that it's better to watch them in the fucking living room.

and, and the alpha always seems to smell like burning wood in winter

and Katsuki feels like he lost in a
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competition that he was never actually part of

and Shoto's disparate eyes seem to always be on him, but when he looks up, they're never seeing him.

and decides to try something desperate, because he no longer knows what to do.

...

They are in their third year
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and Katsuki He's going to ask Deku if they want to spend their heat with him.

He can't be more direct.

There are just a few days left until their heat, and Katsuki is looking everywhere for Deku.

but then he runs into Shoto.

They are both in the kitchen and there are no other
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People near.

Shoto is next to the door, and when Katsuki tries to pass by him, the other omega extends his arm and prevents him from passing.

"I know what you're doing. stop."

what the hell? How dare he?

"what the he-"

"We are friends Katsuki, that's why I'm asking you.
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stop. Izuku isn't yours."

and Katsuki would be lying if he said that didn't make his hair stand on end.

"I've known him for 12 years, and-"

"That doesn't mean he's yours."

The omega says that so calmly, and with such calm eyes that it only makes Katsuki angrier.
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"Oh, so he's yours? I don't see any marks on your damn neck, then? I don't see that he's courting you. So? He's not yours either, right? So I can ask him whatever the fuck I want. Are you worried? What if he says yes? Are you worried that he wants to spend my damn heat with me?
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Are you worried that he prefers me over you?"

Katsuki knows. He knows this is a show. a drowning slap. He knows that Deku spent the last few years attached to Todoroki. but there are still possibilities. Deku already chose him once.

he can choose him again.

(Tweet limit)
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and those words (cruel, he knows they are cruel) seem to break shoto's calm and calm facade.

Katsuki expects him to lash out, to yell at him, to attack him.

He doesn't expect him to growl at him.

He doesn't wait for the burst of smell of a jealous and protective omega that
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surrounds him

He doesn't wait for his eyes, dilated and rimmed with omega gold, when he hisses:

"Stay away Katsuki. He's not yours. He's mine. Fucking.mine."

...
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Katsuki realizes that he has absolutely no chance with Deku one day after his encounter with Todoroki.

The blonde is confident. He thinks Deku is going to say yes. that they are going to spend their season together, even if it is just as friends, and that everything can move
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from there.

When he asks, they tell him that Deku is in the support workshop.

it's late. So Katsuki prepares two cups of coffee and leaves the building.

Deku, with exams looming around the corner, must be tired of working on his support elements
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He is only a couple of meters from the door, when he realizes that it is half open.

and when he is about to enter, He sees something that freezes him in his position. he feels like his legs are made of lead.

(warning ⚠️ +18(?, #DkTd, Intersex Omegas)
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he can see Shoto sitting on one of Deku's work tables.

The omega is wearing a dark green sweater that is several sizes too big for him.

It's a Deku sweater, Katsuki realizes.

and deku... deku is on his knees, between Shoto's naked legs.

his head It is buried in the vertex
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of his legs.

His muscular arms are wrapped around each milky thigh. keeping them separate.

and if the soft moans that come from the omega's mouth are a sign, deku is eating his pussy.

while one of Shoto's hands keeps him upright
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the other is firmly holding Deku's messy green curls.

bringing him closer to his pussy.

What finally breaks Katsuki out of his paralysis is the deep sound that comes from Deku's throat when Shoto, moving his hips, fucks himself with the alpha's mouth.
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and when he looks up, a pair of disparate eyes hold his gaze.

and they stare at him, demanding that he leaves.

and Katsuki ...

... Katsuki leaves.
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and that night, in the comfort of his nest, he realizes that he is going to have to live his whole life with the regret of having rejected Deku.

...

End
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Thanks for reading, I hope you enjoyed reading.

(I am very sorry to those who were waiting for a Dkbk ending)

comments, likes, retweets and followers are more than welcome.

If you want, you can support me on Ko-fi
ko-fi.com/tam5304
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