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To Blow (Up) Or Not To Blow (Up)

Summary:

When Katsuki yells, “Suck my dick,” at Todoroki, he’s not being serious. He’s not. It’s just a thing people say. He doesn’t mean anything by it. What he fails to take into consideration, though, is that Todoroki Shouto has a tendency to take things too literally.
“Okay.”

As a result of this absurd misunderstanding, Katsuki decides to have sex with Shouto so he can have sex with Izuku. Infallible logic, really. Except Katsuki is not the only person Shouto propositions, and Izuku finds it kind of hard to say no to Shouto. Now all they have to do is keep it a secret from everyone, including each other. Especially each other.

Notes:

comments make me very happy. you're also more than welcome to DM me or join my discord server. you can find all the links on my website.

(See the end of the work for other works inspired by this one.)

Chapter 1: The Lobster

Notes:

this is the first time i'm writing fanfic, but i've been writing original fiction for 8 years, so you can trust i'll finish this. it'll just take me a while to update sometimes because i'm also writing other shit. i don't know how many chapters it's going to be either, because i'm posting this as i go, but i know how it ends. that is all. enjoy reading.

Chapter Text

When Katsuki yells, “Suck my dick,” at Todoroki, he’s not being serious. He’s not. It’s just a thing people say. Sure, his outbursts usually don’t involve body parts, least of all his own dick, but it’s not completely out of character for him to say something like that. It’s no different than him telling someone to die. He doesn’t mean anything by it. 

What he fails to take into consideration, though, is that Todoroki Shouto has a tendency to take things too literally.

“Okay.”

It takes Katsuki’s brain a moment to process the word.

“Hah?!”

Todoroki looks at him. “What?”

“What the fuck do you mean, what? You just agreed to sucking my dick!”

“You offered.”

It’s then that Katsuki realizes Todoroki didn’t misunderstand at all. He’s just fucking with him. Katsuki’s hands spark as he growls, “As if I would want you to suck my dick, Half-and-Half! I’d rather get sucked off by a fish!”

“That’s weird, Bakugou. I think you should let me do it.”

“Stop talking about sucking my dick!”

“You started it.”

“Shut up!”

“Okay.”

Silence.

Katsuki considers yelling at him some more but quickly decides he’d rather get to the dorms as soon as possible so he can go to sleep and pretend this never happened. He huffs and stomps ahead. 

Unfortunately, the longer the silence stretches on, the more flustered he feels. It’s not his fault, he reasons. Agreeing to the “offer” as a joke is one thing, but Todoroki fucking doubled down. I think you should let me do it? What the hell is that supposed to mean? Why is he so fucking weird? This day has been long enough already with Endeavor making them work extra hard to compensate for Izuku’s absence, and now this? Whose idea was it for the three of them to return to Endeavor’s agency for their work study, anyway? 

Oh, right. Todoroki. 

Bastard.

Katsuki already yelled at Izuku to get better today, but he really needs the nerd to come back if Todoroki is going to make comments like that. Then again, knowing Todoroki, Izuku’s presence probably wouldn’t have stopped him.

The worst of it is that Katsuki can’t stop thinking about it. Can you blame him? He’s seventeen and sexually frustrated because he doesn’t wanna tell the idiot he’s in love with that he wants to kiss every single one of those stupid freckles on his stupid face and get rejected, so he’s resolved to keep that mortifying secret to himself. Besides, even if Izuku was interested in Katsuki, this is not the time. He’s still recovering from the war—they all are.

Gritting his teeth, Katsuki rubs at his chest.

“Hey, Bakugou,” Todoroki says.

“What?”

“I wouldn’t actually be opposed, you know?”

Katsuki nearly trips over his own feet. “You—what—”

“I would pleasure you if you asked me to,” he continues, as if Katsuki didn’t say anything. “It’s a healthy way to blow off steam, I heard.”

Blow off…

“Are you being fucking serious?”

Todoroki makes a noise of confirmation.

Great. Now Katsuki definitely can’t get the thought of Todoroki fucking Shouto giving him a blowjob out of his head, those cold blue and gray eyes staring up at him, his hand messing up the perfect divide of red and white on his head… Katsuki is about three seconds away from exploding out of pure embarrassment/lust/anger. He clenches his hands, barely quelling the urge to blast Todoroki’s face off.

“Tch,” he says, still not sure if Todoroki is joking around or not, because as oblivious as he is sometimes, he can be really dry and witty, too. Katsuki wouldn’t put it past him to pretend to be serious just to rile him up, like how he kept saying they needed to catch up when they failed their provisional license exam. Yeah, no shit.

But what if he is serious?

“If you wanna suck a dick so bad, you don’t need me,” Katsuki murmurs.

“But you offered.”

“It’s an expression!” he erupts.

Todoroki is undeterred.

Katsuki glares at him. “Since when are you into dicks, anyway?”

“I don’t have a preference.”

Oh. 

Okay, so he is actually being serious.

The fight leaves Katsuki instantly.

“So… what?” he says, clearing his throat. “You’re bisexual?”

Todoroki shrugs.

Fair enough.

“You?” he asks.

Katsuki’s face burns. There’s no reason for him to feel awkward about telling Todoroki about his own sexuality, all things considered, but he’s never told anyone. He doesn’t think anyone really needs to know. Except the nerd, if Katsuki ever gathers the courage to tell him, though sometimes he thinks Izuku already knows. He did say once—in front of their fucking classmates—that Katsuki has never shown interest in any girls, or rather, that he thinks they’re a pain in the ass.

Well, so is Izuku.

Stupid nerd.

He looks away, shoving his hands into his pockets. “None of your business.”

“Okay.”

They don’t say anything for the rest of the way. Todoroki only breaks the silence when they finally get to the dorms.

“Goodnight, Bakugou.”

He grumbles something unintelligible in return.

 

*

 

“Fine,” he says the next day, when they’re on their way to the agency again.

Without Izuku again.

Katsuki absently rubs his chest.

Todoroki stares, blinking.

“You can… suck my dick or whatever,” he clarifies. “I don’t care.”

He’s been thinking about it all day.

Even when he stopped by Izuku’s dorm to force food and medicine into him, his mind kept returning to Todoroki’s strange offer, which was even stranger in the face of his innocent, unknowing, bed-ridden… friend? Crush? Owner of his carefully mended heart? (He can only imagine how red Izuku’s face would have been if he told him what he was thinking about.)

Anyway, he ultimately came to the conclusion that it’s not actually that strange, because he might be in love with Izuku, but they’re not together . He doesn’t have to be faithful to someone who doesn’t even know how he feels about them, even if it sometimes feels that way. Realistically, he can do whatever the fuck he wants with whomever the fuck he wants. Besides, Todoroki is good-looking and straightforward and, apparently, not straight. So why shouldn’t they “blow off steam” together? If anything, this is a good thing. Katsuki needs to practice. For Izuku, obviously. Maybe. Hopefully.

“Oh,” Todoroki says. “Okay.”

“If you tell anyone, you’re dead.”

“Why would I?”

“That’s right,” Katsuki huffs.

“No, why would I tell people we had sexual intercourse? I don’t go around telling people I masturbated two days ago.”

“You—why—” He growls, dragging a hand over his warming face. “Just call it ‘jerking off’ or something, shithead! You don’t have to be so proper about it!”

Todoroki makes a sound of displeasure. “You understand what I mean, don’t you?”

“Yeah, but it’s not…”

“What?”

Trust Todoroki Shouto to solicit someone and then be a complete bore about it. What did Katsuki expect? That he would be sexy? He’s lucky if the bastard is not completely awful at it. The act itself, that is. Not the talking. That’s a lost cause.

“Never mind. When are we doing this?”

Todoroki shrugs. “Tonight?”

“You’ve never done it before, have you?”

“No.”

“Good.”

“Why is that good?”

Because Katsuki hasn’t.

“Because I’m not gonna let you show me up,” he says.

Todoroki tilts his head. “So you’ll be returning the favor?”

“Why wouldn’t I return the favor?” he snarls at him. “I don’t do half measures. I’ll fucking show you.”

 

*

 

When it actually comes down to it, though, Katsuki is kind of nervous. 

He’d rather die than admit it out loud, but he’s not always in control of his quirk, especially when he experiences strong emotions. Granted, everyone sweats more when they’re angry or scared or engaging in sexual activities, so it’s not exactly his fault, but well… not everyone has highly explosive sweat. It feels like he should have a handle on it. He can control it to some extent, but sometimes he just can’t help it.

He’s managed to avoid blowing his own dick off so far, at least.

It’ll be fine , he tells himself. He’s going to be the number one hero, for fuck’s sake. If he can fight powerful villains and level buildings, he can keep himself from losing control when his classmate is sucking his dick.

Still, he genuinely questions his own sanity for a moment when he lets Todoroki into his dorm. He rarely has visitors and now he’s willingly allowing someone inside. Not just his room, but his pants, too. Not that no one has ever seen him naked before—Katsuki doesn’t give a shit who sees him in the bath—but he’s letting Todoroki touch him. His dick. With his mouth.

Maybe it’ll feel a little less weird if he goes first.

Yeah.

He locks the door and gestures at Todoroki’s pants. “Off.”

“Me?”

“No, the fucking door—yes, you.”

“Okay.”

And so he takes them off.

It doesn’t escape Katsuki that his hair is two different colors down there, too, evenly split down the middle, like a fucking two-toned lobster. And he should’ve expected it, really, but it still catches him off guard, especially because the dick nestled among all that hair is already half hard. It’s kinda funny how it betrays Todoroki, despite the blank look on his face.

“Now you,” he says.

Katsuki’s head flies up. “Hah?”

“Oh, I’m talking to the door.”

“Fuck off,” Katsuki snarls, shoving his pants down.

Which means they’re both naked from the waist down now. 

Something unbearably hot travels through Katsuki’s body at the thought. He ignores it and grabs Todoroki’s cock, making him look down. He doesn’t say anything, not even when Katsuki starts moving his hand along his length. He just watches. 

It’s fucking weird.

Katsuki is just about to say something about it, when Todoroki asks, “Have you done this before?”

“Are you saying I’m not doing it right?” he grits out, and just to be an asshole, he squeezes his dick, too. Todoroki’s mouth opens in a silent gasp. 

“I—no, you’re—you are. I was just curious.”

“Hm.” Katsuki releases his grip. “I haven’t.”

He nods. “That makes me feel better.”

“Whatever,” Katsuki mutters, looking down.

Todoroki moves closer as he takes Katsuki in his hand, bringing them together, and the heat in Katsuki’s body spreads at the contact, making his face heat up without his permission. They’re both fully erect now, and it’s obvious that they’re basically the same size—Todoroki’s dick is just a little longer, a little thinner, a little straighter.

He wonders for a second why he spends so much time analyzing Todoroki’s genitals like a fucking weirdo, until he remembers the whole fucking point of getting naked with someone is to look and touch. And then he almost laughs out loud at the thought that Izuku would’ve been doing the analyzing out loud, which makes his chest fill with an emotion that this moment absolutely does not call for, so he banishes it.

The movements of Todoroki’s hands are slow, careful. Katsuki usually prefers a faster pace, but this feels… nice, actually. He likes feeling another person’s warmth against his own. The only thing he doesn’t like is that he doesn’t know what to do with his own hands now that Todoroki has taken over. He has to do something, too.

Maybe he should touch him? Where, though?

He needs to take his fucking shirt—

Todoroki makes a sound that slams the pause button on Katsuki’s brain.

Jesus Christ.

For some reason that sound makes him feel even hotter than the fact that their dicks are literally touching. It’s not even a moan, really—just a breath that skips a bit as it leaves his mouth. But it’s Todoroki. If someone told him the bastard liked knitting in his free time, he would’ve been more inclined to believe that than that he can sound like… like that .

Katsuki decides he wants to hear more. It’s a clear sign that Todoroki feels good, and Katsuki is always, always determined to prove that he is the best, so he’s going to make the bastard make as many of those sounds as he possibly can. He reaches for Todoroki’s shirt, urging him to raise his arms so he can take it off. He does so without complaint, before going right back to what he was doing with his hand, sending light tingles down Katsuki’s spine. When Katsuki touches Todoroki’s bare chest, he doesn’t react at first, but the more daring his touches become, the heavier his breathing gets. He seems to like it especially when Katsuki’s hand goes further down, below his abs, into that ridiculous bicolored patch of hair, taking his hand away so he can take over. His breathing is deep and raspy, and Katsuki’s skin is buzzing with the knowledge that it’s all because of him.

Then Katsuki drops to his knees.

Todoroki blinks down at him. “Oh.”

It’s the first word he’s said in minutes.

“What?”

“Nothing. Continue.”

Katsuki smirks, bringing his mouth to the tip of his cock. He just rests his lips against it at first, seeing Todoroki’s reaction—another soft, aborted breath—before he opens them, tongue darting out. He holds him securely at the base so he can lick around the head.

It tastes vaguely sweet.

Todoroki bites his lips, eyelids drooping, then murmurs, “It feels good.”

“Of course it does,” Katsuki preens.

Yeah, he’s never done this, but he’s read and seen things and he knows what feels good on himself, so he feels confident he’s doing a good job. Todoroki seems to agree because when Katsuki speeds up, he finally, actually groans, gripping a handful of Katsuki’s hair. It sends all his blood straight down to his cock.

God, if he knew what a power trip this shit was, he would’ve done it sooner.

He tries to take as much of Todoroki’s length into his mouth as possible until his throat seizes up. It’s not the most comfortable experience, but it’s worth the sounds he receives. Todoroki tries to bite back most of his sounds, but what he does let slip is pure fucking sin, if only because it stands in such stark contrast against the monotonous way he normally talks.

It doesn’t take long for Todoroki to gasp, “Bakugou, I’m— ah —I’m gonna—”

He thinks of pulling away, but the thought dies as quickly as it came. He’s not a quitter. He will see this through to the end.

Todoroki’s body curls over him, hips stuttering with the shocks of his orgasm. Hot cum hits the back of Katsuki’s throat, and he swallows it, even as Todoroki unwittingly pulls on his hair. It makes him let out a strangled sound that he really hopes Todoroki is too distracted to hear.

He can’t decide if he likes it or not—the hair pulling. But he likes that Todoroki is so affected that he can’t help it. He sits back and takes in the pink flush on Todoroki’s cheeks with genuine astonishment.

He has never seen Todoroki like this.

Todoroki suddenly sinks to his knees as well, right in front of Katsuki.

“What the hell are you doing?” he rasps.

“My legs are tired.”

“Get on the bed, then. I’m not letting you suck me off on the fucking floor.” He gets up and stomps over to the bed without waiting for a reply. He yanks his shirt off, flinging it across the room, and sits down.

Todoroki then crawls—actually crawls across the floor to get over to him.

“You’re ridiculous,” he mutters under his breath.

Todoroki doesn’t respond, just pushes his knees apart and sinks down between them. Katsuki watches, stunned, as he takes nearly his entire length into his mouth in one fell swoop. 

Holy shit.

He can’t help the moan that tears from him. He’s not one to agree with the lobster, but yeah, it feels good. Really good.

He starts to bring a hand up to his head so he can run his fingers through the silky strands of his red-and-white hair, but he pauses when he remembers the sweat on his hands. As much as he talks about killing his classmates, he doesn’t actually wanna blow up Todoroki’s head. Especially not when he’s sucking his dick. Imagine explaining that to Recovery Girl. Or worse, Eraser Head. He shivers at the thought and wipes his hands on his sheets.

Todoroki swallows him like a man starved, over and over. Katsuki fears he’s not going to last much longer than Todoroki did. It feels so much better than his hands—the heat of his mouth, the wetness, the intense eye contact. When Todoroki rubs the tip of his tongue repeatedly over the underside of Katsuki’s cockhead, he curses. How the fuck is he so good at that?

“Hey— fuck . Stop doing that,” he hisses.

Todoroki pulls off with blinking eyes. “Why? Does it hurt?”

“No, you idiot. It feels good.”

“Oh. Why did you tell me to stop, then?”

He grits his teeth. “Fine. Continue.”

So Todoroki continues abusing his dick, and he’s trying so hard not to show how affected he is by it that he completely forgets about his hands. He’s wound so tight all he manages to say is, “Shit, wait—” before it slams into him.

He throws his hands up just in time so the explosions go off above them instead of demolishing his bed. He doesn’t even notice Todoroki drops to the floor until he’s done cumming, and he finds him crouching between his legs with his hands covering his head, cum splattered on his arms.

“Shit,” he breathes out.

Todoroki slowly uncovers his head, eyes wide. “A warning would’ve been appreciated.”

“Sorry.”

Through the wall he shares with Kirishima, he hears, “Bakugou? What was that?”

He glances around the room, hazy with smoke. The ceiling, blackened but somehow still intact. And Todoroki… butt naked, flushed face right in front of Katsuki’s softening cock. 

Good fucking question.

“Nothing!” he shouts back.

There’s the sound of footsteps, then a knock at the door.

He’s so fucking glad he locked it.

“I said it was nothing, Shitty Hair!”

“Are you sure? That was a much louder explosion than your usual ones.”

“Yeah, I’m fucking sure.”

“…alright.”

They wait for Kirishima to go back to his room before Katsuki reaches for the tissues on his nightstand, furiously wiping down Todoroki’s arms with a constant stream of muttered curses, at Kirishima, at Todoroki, at everyone on the fucking planet, including himself.

“It’s alright,” Todoroki says. “I set my sheets on fire the first time I—”

“Shut up.”

“Okay.”

 

*

 

Katsuki thinks he actually got away with it somehow, until Aizawa-sensei shows up to assess the damage not even ten minutes later.

Aizawa sighs at the ceiling. “Do I even wanna know?” 

Todoroki is gone, at least, so he doesn’t have to explain that .

“It won’t happen again,” Katsuki grits out.

“Good.”