when i fill them, they’ll shine forever | ch 6
pairing: todobakudeku (bakugou x midoriya x todoroki)
genre: fluff, angst | abo au, canon-compliant
warnings: swearing, trans male character, mild canon-typical violence, mentioned child abuse, implied non-con, misgendering, endeavor
word count: 4118
summary: Katsuki being an omega from birth changes a few things.
chapter six of when i fill them, they’ll shine forever
"If you're here to give me some sympathetic speech or some shit, I will kill you, Pinkie," Katsuki spits over his shoulder.
"Eh?" Pinkie startles, scrambling to compose herself as Katsuki turns to look at her. "I have no idea what you mean."
Katsuki narrows his eyes at the way she nervously scratches the back of her head, her smile much too wide to be genuine. Pinkie scuffs the toe of her shoe against the floor, her arms dropping to her sides so she can play with the ends of her school jacket. Her scent is as sweet as any other omega’s but there is a sour aftertaste to it that makes Katsuki wrinkle his nose in distaste.
"What the fuck do you want? I have places to be," Katsuki says as he crosses his arms over his chest.
He doesn’t know anything past a few of his classmates’ quirks, much too busy with bettering himself and challenging his mates to give a shit about anyone else. Shitty Hair and Pikachu are showing some potential since they have enough of a backbone to socialize normally with him instead of fearfully or putting him on a pedestal. Most of the others will be unimportant to his story in the long run and Katsuki isn’t usually the type to write people off so soon, but Pinkie herself hasn’t impressed him in the least.
“I just um-” Pinkie flushes, fingers twining together nervously. “All the girls wanted to thank you.”
Katsuki frowns, suddenly confused. As far as he knows, none of the girls want to be within two feet of him. He has no idea why they would want to thank him for something.
The only thing he can think of that would be spoken about is the Perverted Grape incident that happened earlier that day. Katsuki is waiting for Deku to finish talking to Glasses, Todoroki already having left a few minutes before. He wants to go to Deku’s and gorge himself on Auntie Inko’s cooking while he avoids going home where his mom will scream for blood and his dad will flutter nervously around him for the rest of the weekend. He already had Glasses, Hundred Arms, and Shitty Hair try to comfort him in their own shitty ways about Perverted Grape, he doesn’t need any more of this crap today.
“What the fuck is this about?” Katsuki asks, glaring down at Pinkie. “You have five seconds to speak or I’m walking away. One.”
“Thankyouforgettingridofmineta!” Pinkie shouts, bowing at the waist once before she runs away.
Katsuki scoffs as he watches her leave. “As if I did it for any of you.”
“Did what, Kacchan?” Deku’s voice pipes up behind him.
“Nothing, you shit nerd. Let’s go already,” Katsuki grumbles, barely even reacting to Deku’s sudden appearance.
His alpha’s scent is more familiar to him than his own so if Deku really wants to startle him, he is going to have to work harder than that.
Katsuki takes Deku’s hand and leads the way towards the train station, already imagining all the dishes his Auntie Inko will prepare. Deku follows behind him quietly, not having to say a word for Katsuki to understand his alpha will always support him.
The sports festival is turning out to be fucking boring.
Katsuki delivered his "speech" before the first challenge began, which was really just him pointing out a fact by stating that he and his mates were going to mop the floor with all of them. No need for everyone to get their fucking panties in a twist at the truth.
They had taken one look at the mouth of the tunnel before both his mates grabbed hold of Katsuki’s arms and held on tight as he shot them over the other students piling up beneath them. Many yells and shouts had followed them but Deku only whooped as they came out of the other side and got their first glimpse of the obstacle course prepared for them.
The zero pointers from the entrance exam rose up to greet them but Todoroki froze one and Katsuki blew up the one beside it at Deku’s request. Deku had grabbed a stray piece of the now broken robot as they flew over it while Todoroki directed ice back at the other students to cut their competition in half. At the pit, Todoroki made more ice to make them a path straight across and Katsuki used more of his blasts to ski them over the pit in no time at all.
By that point Katsuki and Todoroki had practically ruined the obstacle course as they held Deku between them, all three of them keeping first place easily. Then Deku had pulled himself away from them at the third obstacle, dropping onto his knees to dig at the edges of the landmine before Katsuki got the memo. Together, they dug up the explosives and put them in a pile together.
Todoroki had just enough time to grab Deku's shirt and Katsuki climbed onto his alpha's back as Deku held up the piece of the robot that he had nabbed earlier. His alpha then slammed it into the explosives and all three of them were thrown into the air, sliding past the finish line easily and more importantly, together.
The second challenge hasn't been that big of a challenge either actually. Katsuki grudgingly allows Round Face to join their team after Deku brings up his plan and when the countdown begins, Todoroki makes ice appear in a circle around them while Round Face slaps her hands on the backs of Katsuki’s mates before pressing her fingertips together with a determined look in her eyes. Katsuki settles Deku on his shoulders and waits until Todoroki and Uraraka have grabbed hold of his alpha’s arms to shoot them up in the sky. More yells and shouting follows them but Katsuki ignores it. He knows they are not breaking the rules through anything but a technicality and while last year, he would be enraged about using such a cheap tactic to win, now he only cares to shield his mates from any harm that may befall them.
Despite the lack of a real fight, their team is doing exceptionally well by staying out of other students’ grasps. The only time anyone gets near enough to almost ripping the headband worth a million points off Deku's head, Todoroki's left side erupts with the barest lick of flames before his ice overcomes some random girl’s vines. Katsuki felt the almost unbearable heat of Todoroki’s fire tease the back of his hand as he prepared himself to power off an explosion and can't help the sharp intake of breath that he takes through his teeth at that moment.
Which is why he is only slightly surprised when Todoroki asks him and Deku for a word in private during the lunch break. Once the break is over, all the stupid extras will then ready themselves for the games UA's staff has prepared for the losers who didn't make it to the final round so technically, they have a longer break than most. Katsuki exchanges a not-so-subtle glance with his alpha before he nods and allows Todoroki to lead the way.
As soon as they are alone, Todoroki tells them his life story.
All of it.
The quirk marriage. The forced mate bond. The breeding. The training he began at age four. His mother losing her grip on sanity. The isolation from his siblings and peers alike. The abuse he has withstood ever since then. The resentment and anger Todoroki has carried for countless years. The determination to never use the quirk he inherited from his father.
Every single, excruciating detail has Katsuki's blood boiling and his hackles rising. His body calls for blood, the need to defend and fight and tear limbs apart almost overcomes him.
He doesn’t understand how a parent can look at the life they helped bring into this world and not want to protect them with all their power. Deku has an idea if his claim of not being All Might’s secret love child can be believed, but Katsuki has never faced that misfortune. Not even his coming out impacted the relationship he had with his parents much - not in the way that most would expect anyway. Katsuki does not understand and he never will but he does understand that what both his mates’ fathers have done and are doing now is wrong.
Wrong and awful and horrible. Downright evil in Todoroki’s case. That is more than enough to warrant Katsuki’s bloodlust. He’s sure his parents would understand why he murdered the Number Two Hero anyway. Auntie Inko most definitely would. Hell, probably Yagi-san too, especially considering the way he dotes on Deku.
Regardless, Katsuki has already made up his mind.
"I am going to fucking kill him," Katsuki spits out between clenched teeth, his hands smoking and curled into tight fists at his sides. "No, no. I am going to destroy him! I'm gonna rip off his balls and feed them to him! I'm gonna hold my hands over his skin and see how well he likes getting burned!"
Katsuki continues, his methods of torture growing more grotesque and painful as he does, all while ignoring the surprised and somewhat wary look on Todoroki's face. Deku is silent beside him, but his scent tells Katsuki enough.
Their alpha is angry.
Deku is trembling, his eyes flashing gold and hands curled into fists as well. The air around them reeks of ozone and Katsuki feels the ridiculous urge to sneeze. Todoroki’s gaze keeps flickering between the two of them, unsure of who needs his attention more: his alpha who is rapidly losing his grip on his control or his omega who is ranting about every which way he will harm his father.
"Aren't you going to tell me that killing is bad and I don't know what other fucking nonsense you preach and shit?" Katsuki asks when Deku's scent sours enough to bother him. "I'm gonna murder the Number Two Hero, you fucking nerd. Shouldn't you stop me?"
Say something, Katsuki doesn’t plead aloud. Say you agree. Say you’re with us, no matter what.
Deku tenses all at once then sighs, his body going lax as he closes his eyes and leans his head back on the wall behind him. "If it was anybody else, literally anybody else, I would say yes."
Katsuki smirks, the edges of it sharp enough to cut. "But?"
"Not in this case," Deku finally says, his scent still angry and now frustrated.
"I am fully capable of killing that bastard, you know," Katsuki continues, eyes flickering between both of his mates. "I could go and murder him right now and I would be glad to be thrown into jail for it. My parents would probably throw a fucking party."
Todoroki looks at him like he's insane, but Katsuki ignores him. He focuses on Deku instead, watching the corners of his mouth twitch with a smile, the sour anger in his scent slowly starting to bleed away.
"I know, Kacchan," Deku agrees, opening his eyes which have now returned to their normal color and leaving Katsuki horrified as they start to water.
Katsuki bites his lip, looking back at Todoroki again who is staring open-mouthed at Deku in shock. "Do you want me to?"
He means it as a question for them both but it is Deku who answers. "Yes, but you shouldn't. People would paint you as a villain and that's not who you are, Kacchan.”
“Shut the fuck up, Deku,” Katsuki bites back but there is a smile on his face and no heat in his words.
“Okay,” Deku replies with a tired smile.
Katsuki pivots to stare at Todoroki, pinning his beta with his gaze alone. “And you, you bastard, come here!”
“Are you going to kill me?” Todoroki asks as he stands up straight, his spine probably in pain due to how quickly he came to attention.
Katsuki's grin turns sharp once more. “If you Order me again, then yes, but just get your ass over here already! ”
“Wait, you Ordered Kacchan?” Deku asks, head swiveling between them both in confusion.
"Twice, the fucking shithead!” Katsuki admits.
Deku's eyes turn flinty before they soften once more. "You must have a death wish, Todoroki-kun. Please, don't ever do that again."
Katsuki huffs, crossing his arms over his chest as he glares at his alpha. "I don't need you to defend me, fucking Deku!"
"I know," Deku murmurs, "but sometimes, you want me to and I don't really appreciate the fact that someone would Order you, even if he's our mate, Kacchan. Todoroki-kun, seriously, don't do that again."
"Shut up, Deku," Katsuki spits out at the same time that Todoroki says, "I won't Order you again, Bakugou-kun."
"Good," Deku huffs as Katsuki moves closer until he can sling an arm over his alpha and tuck him into his side. "Now get over here. We're going to scent you so your father knows he'll have plenty of things to explain the next time I smell him on you."
Katsuki nods sagely. "Deku will destroy him."
"Why would he do that?" Todoroki looks at Deku like he can't imagine the alpha going toe-to-toe with his dipshit of a dad, but Katsuki knows better. And Todoroki should know better too after what happened the week before in the locker room's bathroom.
"Because you're our mate, you fucking bastard," Katsuki growls, reaching out and grabbing hold of Todoroki's arm before he drags him closer. "We'll end anyone who fucking hurts you. You're mine now and I don't like it when people touch my things. I beat the shit out of anybody who dared to lay a hand on my alpha and I'll beat the shit out of anyone who hurts my beta too."
Deku smiles at Todoroki from underneath his arm, his scent calmer and steady like before. "Don't worry about it, Todoroki-kun. Kacchan is just really overprotective. You'll grow used to it."
Todoroki is stiff underneath Katsuki's hand, but, slowly, he starts to relax as well. He leans into Katsuki's side and lays his two-toned head against Katsuki's shoulder. On his other side, Deku does the same, mirroring their mate. They stand there for a moment, huddled up in each other's warmth as they allow their scents to slide across one another, mingling and intermixing. Katsuki is certain that no one is going to speak for some time yet, so he's slightly surprised when Deku does.
“Your quirk is your own, Todoroki-kun.”
“Hm?” Todoroki hums in response, his head shifting against Katsuki’s shoulder.
Deku leans forward until even Katsuki is having difficulties keeping his eyes on them. “Your fire is your own. Everyone else here is using a hundred percent of what they’ve got to make it. It would be wrong of you to do this with only half.”
Todoroki stills in Katsuki’s embrace, expression shifting until his face is blank once more. Katsuki can physically see all the walls Todoroki is putting up again and he cannot have that.
“We can talk about that later, you little shits,” Katsuki cuts in. “Deku, seriously not the fucking time.”
His beta’s scent pulses for one short breath before it calms, Deku oblivious to it all as he starts to say, “Todoroki-kun should work with a hundred percent of what he has too, Kacchan! Otherwise-”
"Shouto."
"Huh?" Deku asks, like a fucking idiot as if Todoroki's intentions aren't clear enough.
Todoroki only blinks at him though, his scent still remaining calm and focused. "You can both call me Shouto."
Deku brightens considerably, his smile like the sun breaking through a heavy layer of overcast while he pushes the quirk issue off to the side for now. "Ah, well you can call me Izuku and Kacchan Katsuki!"
"No, he can't," Katsuki scowls.
"Yes, he can," Deku replies instantly, his smile never faltering. "Go sulk another time, this is loving and supporting our mate hours right now!"
Katsuki can't help the startled laughter that escapes him, but he lets it run its course when Deku only brightens even further at the sound and Todoroki relaxes against him again. "Shut the fuck up, Deku. That meme is as old as balls."
Deku's grin only grows bigger, the edges curving dangerously but he says nothing and wraps his arms around Katsuki's waist. Todoroki too settles further into their warmth, his scent now laced with a dash of content.
From the corner of his eye, Katsuki can see the hint of a smile on his beta's face. The sight alone does weird things to his heart that he promptly ignores in favor of enjoying the company of his mates.
Deku and he run into Endeavor before starting their second fight in the third challenge and Katsuki wonders how the Flaming Piece of Shit got out of there alive.
Considering that All Might was also present, Katsuki is doubly confused about how Endeavor is still breathing.
“Come on,” Katsuki spits as he drags Deku out the door. “Fuck everything else and focus on this stupid match. If you let your quirk break you again, dipshit, I’m taking our beta in the divorce.”
Katsuki isn’t happy at all about the team matches but considering that there are many mated students in the sixteen contestants left for the third challenge, he supposed that it made some lick of sense. Not that he’s going to admit that out loud anyway.
Deku laughs, following behind Katsuki willingly, but his smile dies as they round the corner and run into the last person either of them wanted to see.
They have seen the Number Two Hero plenty of times on television and social media. Katsuki thought he was pretty average looking when he was younger but at that moment he is ugly beyond belief. His facial hair is made up completely of fire and spare bits of it run through his hair. He is tall and in his hero suit but there is nothing about him that shows he is a hero in Katsuki’s eyes.
Instead of the mild admiration Katsuki used to feel for this man, all he can focus on is the hate and rage that’s building up quickly within him.
“So you’re the alpha who’s staked a claim on my son,” Endeavor says like he never expected anybody to try and interfere with the plans he had forced upon his child’s shoulders.
Katsuki bares his teeth at him, forcing himself to stay silent. Endeavor’s eyes linger on Deku’s arm where he is grabbing hold of his alpha. His gaze flickers to Katsuki briefly, looking him up and down as if he is a piece of meat being put on display at the market before he focuses back on Deku. Katsuki can’t help the cold disgust that rolls down his spine when the Flaming Piece of Shit’s eyes are no longer on him. Deku shifts beside him in response, subtly putting himself in front of Katsuki to shield him from view.
“And you’re Shouto’s father,” Deku points out, the anger in his voice plain for anyone to hear.
Endeavor’s brows raise up for a moment before his face settles back into its usual scowl. “Your omega. She’ll do fine but if you don’t prove you are the best alpha around, neither of you get to have him.”
Deku growls and the overbearing scent of ozone fills up the hallway. Katsuki holds onto his alpha tighter while allowing his lips to curl back and make his snarl look more aggressive.
“You don’t decide that for him,” Deku snaps. “And don’t refer to Kacchan as a girl. He will rip out your tongue for such disrespect.”
Endeavor’s gaze flicks back towards Katsuki at this and Katsuki snaps his teeth at him, wanting nothing more than to do just that.
Shouto had told them about all the awful crap his father had done but this - what he just said - takes the fucking cake. Katsuki wants to let go of his alpha and watch him tear into this arrogant beta until there is nothing recognizable left. He doesn’t though because he isn’t stupid and the only person allowed to go to jail is him, but the idea itself is still very tempting.
Fortunately, Yagi-san’s smell rises up behind them announcing his presence. Katsuki doesn’t look back to see his arrival, not trusting Endeavor enough to take his eyes off him but he does smell it when Yagi-san realizes what is going on. It would have been difficult not to, considering Deku is sending out angry and agitated alpha pheromones for everyone in the entire building to smell. Even the lowliest beta with the worst sense of smell would be able to tell that Katsuki’s alpha is in distress.
Within two seconds, Katsuki is facing the broad back of the Number One Hero. All Might is in the shifted form he uses for public appearances and has his arms extended by his sides in a way that appears natural but effectively blocks them both. The fact he did this in a way that did not draw any attention to them at all is only another reason why Katsuki immediately begins to calm down when All Might appeared.
“Endeavor, what are you doing to my students?” All Might rumbles, acting as if he had not stumbled over the end of his question.
Katsuki can no longer see the expression on Endeavor’s face but he can hazard a guess about it well enough. “Wishing them luck.”
All Might’s stance doesn’t relax in the least. “Then you may go now. These two are due for their match soon.”
Endeavor merely huffs and walks away then. All Might doesn’t move from his stance until the other man is no longer nearby. He turns and smiles at them, dropping a hand on both their shoulders when the coast is clear. Katsuki allows it, his anger still pulsing dangerously within him even if he knew they are safe with All Might now present but it is dying down nevertheless.
“What happened?” All Might asks, his blue eyes glinting dangerously under the hallway halogens.
Katsuki tells him. He keeps quiet about what their mate had told them earlier that day because it isn’t any of his business to share until his beta is ready to get help, but he holds nothing back about the conversation they just had with the Flaming Piece of Shit. All Might’s eyes turn almost black with the force of his anger, more ozone joining the air around them.
(And Deku had seriously thought Katsuki wasn’t going to assume that Yagi-san was his dad?)
“He won’t bother you again. You have my word,” All Might vows. “Now run along. Your match is starting within the next three minutes.”
They both nod and are rewarded with pats to their heads. Yagi-san then steps to the side so he is no longer blocking the path and Katsuki drags his alpha away before Deku can add more fire to the fuel.
Katsuki and Shouto share first place, Deku taking second and Emo Birdbrain taking third.
He would consider it a loss any other time, but considering all the crap Shouto has been put through and shared with them today, Katsuki just rolls with it.
(And no, he does not miss the fact that All Might hugs his alpha just a little too long to be normal after he drapes their medals over their heads during the awards ceremony. Going by Shouto’s thoughtful hum beside him, their beta doesn’t miss it either. That conversation should be fun.)
Later, he still takes pleasure in burning and blowing up all of his and Deku's Endeavor merchandise.
He takes greater pleasure in watching Shouto try and keep a straight face as Katsuki blatantly flirts with him when they get ice cream the next day. Deku's flirting is a lot more subtle but they both relish at the sight of Shouto's flushing, blank face over a banana split.
Of course, not all good things last. Katsuki had learned this fact early on in life.
He knows it isn't true when people say that the only way is up. Life isn't that easy and it has never been especially kind to Katsuki of all people. He doesn't mind that fact. He understands that is just how things work and that it is the way of life no matter how much he may wish it not to be. It's just how things are and he gets that.
He just didn't expect the rug to be pulled out from under his feet so soon is all.
a/n: sorry for the wait! i hope that you all liked this though (: thanks for reading!
