Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/ works/12499328. Rating: Explicit Archive Warning: Underage Category: M/M Fandom: 僕のヒーローアカデミア_|_Boku_no_Hero_Academia_|_My_Hero_Academia Relationship: Bakugou_Katsuki/Midoriya_Izuku/Todoroki_Shouto, Bakugou_Katsuki/Midoriya Izuku, Bakugou_Katsuki/Todoroki_Shouto, Midoriya_Izuku/Todoroki_Shouto Character: Bakugou_Katsuki, Midoriya_Izuku, Todoroki_Shouto Additional Tags: Freeform_kinda, a_little_fluff, a_little_smut, Threesome_-_M/M/M, Polyamory Stats: Published: 2017-10-25 Words: 4395 ****** sparks will fly ****** by purpleho Summary Katsuki, Izuku, and Shouto get together. That's the whole story. Notes this is kind of a small collection of drabbles in the same timeline. comments are always appreciated. enjoy~ 7. It burns.   The flittering touches that run up and down the expanse of Izuku’s torso burn his sides. It’s too hot, far too hot and he whines and convulses at each graze of a fingertip and swipe of a calloused palm.   When two fingers find a nipple and pinch hard, sending a rush of heat coursing through him and causing him to break out into a cold sweat, that’s when he loses it.   Izuku feels like he’s on fire. His eyes roll back and he can’t help the unintelligible blabber that falls from between his lips.   It burns, but honestly, he wouldn’t want it any other way.   Katsuki’s sweat slick, rough palms rubbing him down from head to toe. It’s sticky and maybe a little gross but it sends Izuku into a frenzy every time.   Shouto’s left hand emitting the heat of boiling water as his fingertips just graze the surface of porcelain skin. It scorches Izuku to the bone, but he can’t help his pathetic, gargley whimpers for more.     Then there’s a moment when real flames ignite in the curve of Izuku’s tummy.   The nitroglycerin filled sweat that pours from Katsuki had gathered there, in the ridges of Izuku’s hardly defined abs.   And the heat emanating from Shouto was enough to set anything even remotely flammable on fire at that point, so the nitroglycerin does what it does and burns.   They stare at it.   Watch the flames dance around on Izuku’s upper abdomen. It makes his skin look almost luminescent.   Shouto and Katsuki’s faces become fully illuminated and Izuku’s wide eyes drift up to look at them. The way their faces contort into pure awe. The way they lean closer and rest their heads against each other.   Izuku cries at the site. The site of his boys looking so gorgeous lit up like that. With the shadows that are flickering across the room sliding over their faces.   Shouto puts it out after a moment longer.   It’s dark again and Izuku’s sobs are loud and snotty.   “Hey,” Katsuki coos gruffly, fumbling closer, letting his palm rub over the taught, blistered skin on Izuku’s stomach.   Shouto falls down next to him in the bed immediately. Drapes an arm over Izuku and nuzzles his nose against Izuku’s cheek.   “Sorry, baby. Sorry,” Shouto murmurs gently.   Katsuki shifts around and grabs the burn cream from the bedside table.   “J-just don’t want it to end,” Izuku sniffles out, sobs fizzling down to tiny hiccups.   Katsuki and Shouto still at that and even though it’s close to pitch black Izuku can almost see their smiles shining through the dark. 1. “I like you.”   They’re alone in the common room, draped over one of the sofas with a few textbooks and loose papers scattered around them on the floor and coffee table.   Izuku is used to Shouto’s bluntness by now. They’ve been close friends for months and it hardly shocks him when Shouto just says what’s on his mind with that blank, far off stare on his face.   So Izuku takes it in stride, not letting himself get flustered because he knows Shouto is still getting used to the whole “social interaction” thing and doesn’t always know how to properly say what he means.   “You know I like you too, Shouto,” Izuku laughs out.   Izuku makes to busy himself with some of the homework they still have left, but Shouto rests a hand on his shoulder.   “No, Izuku, I- I really like you.”   Izuku’s head whips around then. He looks at Shouto, really looks at him. Takes in the way his eyes are cast down, the way his cheeks are dusted a soft pink, the way he’s biting his lower lip.   Oh, he likes me.   It takes a few seconds after the realization fully hits him, a few seconds of awkward sputtering, terribly blushed cheeks, and flitting glances before Izuku can properly formulate a response.   “O-okay,” He says, hardly able to look Shouto in the eye.   Shouto stares at him, eyes wide and searching his face.   “O...kay?” Shouto repeats trying to understand if this is Izuku letting him down gently or something else entirely.   Izuku swallows his nerves for a second, squeezes his eye shut and works up every ounce of courage in his body.   And he leans in and kisses Shouto on the cheek.   When he pulls away, they smile at each other, ragging red blushes licking at their cheeks like wild flames.  The energy between them sparks like a single ember hitting a tree and setting a forest ablaze. 5. The first time Katsuki and Shouto use their quirks together is on Izuku’s birthday.   It’s his first birthday after all three of them are together. They try their hardest to make it special for him, but things never quite go as planned   “Goddamnit, Shouto, I thought you were getting the candles,” Katsuki growls.   Katsuki has come to learn how to keep his voice down when it comes to them. Though his temper is still prone to super bad flare ups, he’s trying. All that matters to them is that he’s trying.   “Katsuki, you were at the grocery store when you picked up the cake, I assumed you were getting them,” Shouto replies calmly, watching Katsuki’s cheeks tint red.   He’s realized it was his fuck up.   “Guys, guys,” Izuku says softly, “It’s okay. I don’t need any candles. It’s not a big deal.”   He looks between them. They’re perfectionists, of course something of such minimal importance would get them worked up because regardless of what it is, it means everything wasn’t perfect.   Izuku tries to think of something to calm them down but before he can  Shouto’s face lights up.   “Katsuki, hold up your index finger,” Shouto says.   He’s cute like that, Izuku thinks, with his eyebrow furrowed slightly. Pleased with himself for coming up with some seemingly brilliant idea.   Katsuki scoffs, but he indulges him anyway, holding his hand up with his index finger pointed at the ceiling.   Shouto reaches out, and touches his own fingertip to Bakugo’s.   A few silent seconds pass, then there’s smoke, and then, in the blink of an eye, a tiny flame sits atop Katsuki’s fingertip.   The three of them are entranced for a moment, unable to look away from the tiny flame that twirls on the pad of Katsuki’s finger.   “Holy fuck,” Katsuki says, breaking their hypnotized stupor.   “Yeah,” Shouto replies, still staring.   Katsuki slowly moves his hand, cupping the flame slightly, until it’s right in front of Izuku’s face.   “Make a wish, birthday boy,” Katsuki all but whispers.   And Izuku does. I hope our flame burns bright forever. 6. “Ow.”   It’s their first time attempting three way sex when the kink is really discovered.   Izuku is sitting in Shouto’s lap while Katsuki is between Izuku’s legs preparing him diligently. They’re all caught up in the moment and it takes Izuku longer than maybe it should to register that Shouto is burning him.   “Shouto, ow,” he says again, louder, and this time both Shouto and Katsuki  stop everything.   Shouto lets his hands fall from their spots gripping each of Izuku’s arms.   “Oh, god, sorry- sorry, what happened, was I gripping too tight, sorry-,” Shouto stutters out   “It was just a little too hot, is all,” Izuku says quickly, cutting him off.   There’s a beat of silence.   “Wait, what? Hot?”   Izuku and Katsuki share a slightly confused look.   “Icy-hot, you never realized your left side heats up unconsciously?” Katsuki snaps, his loud voice booming in the quiet of the dorm room.   “What?”   Katsuki scoffs at him and reaches a hand around Izuku’s body, fingers finding their way to Shouto’s left arm.   “God, it feels like an insane fever, the type that’ll fucking kill you. Izuku’s not used to that kind of heat, you have to be careful with him,” Katsuki chastises lightly.   “K-Katsuki,” Izuku whines, though it feels good to be coddled.   “You’re like that too, you know,” Shouto says suddenly.   Izuku watches as Katsuki’s face twists into a perplexed glare.   “What?”   “Kacchan, you never realized your palms heat up unconsciously?” Shouto says, mocking him.   Izuku can’t see Shouto’s face, but he can almost hear the smirk interlaced in Shouto’s words.   “What the actual fuck,” Katsuki growls.   He has long since the start of the conversation removed his sticky fingers from Izuku’s ass. They’re now rested on Izuku’s inner thigh and he instinctively grips at the toned muscle there.   “Why didn’t you tell me that?” Katsuki continues, now staring at Izuku intently.   “U-uh,” Izuku stutters, embarrassment whirling in the pit of his stomach, “I don’t really mind? I kind of like it?”   They’re quiet and Izuku knows he’s turning bright red.   “I-I just mean, I feel so warm and safe when I’m with you guys and I like that. It’s so comfortable and I-,” Izuku mumbles on until he’s cut off by a peck on the lips from Katsuki .   And like the flame of a lighter being flicked into ignition, the mood returns full force. 2. “You like Bakugo, don’t you?”   They’ve only been dating for 2 and a half months when Shouto asks him. And Izuku’s heart drops and splashes in the pit of his stomach. Because it’s true. He likes Bakugo. He’s had a stupid crush on him since forever and knowing that Shouto knows crushes him.   But the worst part is that he likes Shouto too. He likes Shouto just as much and he doesn’t want to ruin something so perfect and pure, to ruin their amazing relationship that was everything they both needed,over a stupid crush. “S-Shouto, I- it’s not like that, I just-,” Izuku starts, fumbling over his words, trying to come up with what to say, how to say. How not to sound like a total douche. “I like him too.”   Izuku feels his mouth tumbling open and his face scorched by embarassed heat.   He stares at Shouto, has to be certain this whole thing isn’t just a figment of his very active imagination.   A pretty red is blossoming across Shouto’s own cheeks, and he’s staring right back at Izuku.   “What? Shouto, when? How?!” Izuku says, voice rising in pitch, getting louder.   Shouto gestures for him to keep it down because they’re in a public family restaurant and they’re already getting a few looks.   Izuku is confused to say the least. Shotou and Bakugo were at each other’s throats just about every other day and if it wasn’t a screaming match (mostly just Bakugo screaming into a void) it was intense fiery glares.   And on top of that, what did this mean? Izuku and Shouto both had a crush on someone else. A crush on the same person. Was there something wrong with them? Was this some sort of message about their satisfaction with each other?   “He’s a bit dangerous, isn’t he?” Shouto say wistfully, setting an elbow on the table between them and resting his cheek on his palm,” He’s loud and obnoxious, annoying, rowdy, wild. But he’s intriguing.”   Shouto’s eyes shift to the side and his blush intensifies. Izuku knows he’s gawking but he can’t pull himself out of his shocked daze.   “I can’t help but imagine this is how cavemen felt when they discovered fire for the first time,” Shouto continues, “How they felt when they touched it and it burned them. And yet. Even though they knew it was dangerous, even though it was scary, they realized they needed it.”   Shouto’s voice trails off and Izuku almost wants to cry at how eloquently the description of all the pent up emotions he’d felt towards Bakugo for years had fallen out of Shouto’s mouth.   “S-Shouto,” he sniffles out, “What does this mean, though? What about us .”   There’s silence between them for a second,  Shouto’s eyes drift back towards Izuku’s face.   “Haven’t you ever heard of polyamory?” He says, corners of his mouth twitching up into a slight smirk.   The realization flickers insider of Izuku and like fuel being added to a small flame, the emotions inside of him only grow more intense. 4. “I’m cold.”   Izuku says it offhandedly, not to anyone in particular. Fall has just started and there’s a chill in the air, even though he’s already inside.   Class hasn’t started yet and Izuku is standing with Iida and Uraraka by Uraraka’s desk, engaging in their ritual morning chatter.   He doesn’t even think much about his random spoken thought until   “You should wear a better jacket, dipshit,” Katsuki booms, more bark than bite, as he enters the classroom and makes his way over to where Izuku is standing.   Without any thought he grabs Izuku’s hand and  subconsciously rubs it between his own two hands in an attempt to warm it.   “Fuck, you’re freezing,” he mumbles, staring at Izuku’s hand, “Do I need to buy you gloves or something? Won’t take care of yourself until we nag you to death?”   Izuku is about to say something when his other hand is suddenly engulfed in a similarly powerful and warm grasp.   “I have an extra pair with me if you need them going home,” Shouto says, suddenly right beside Izuku.   He’s exuding heat from his left side, though whether intentional or not, Izuku isn’t entirely sure. Izuku can’t help but lean into him, feeling comfy in an instant.   “Kiss-ass,” Katsuki says, no spite in his words, as he looks at Shouto with slightly narrowed eyes.   “True,” Shouto replies easily with this shit eating grin on his face.   Izuku laughs so hard he can barely catch his breath and even though Katsuki tries his best to hide it, a wide grin cracks across his own face.     “U-um.”   Uraraka’s voice brings them back into their surroundings and Izuku finally realizes that everyone is staring. Everyone.   “Oh, yeah, we’re sort of, uh, dating?” Izuku says sheepishly, face flushed and brain slightly out of it from his previous giggle fit.   “Surprise?” He adds as an afterthought, flashing a meek smile at Iida and Uraraka seconds before taking in their borderline horrified expressions.   There’s dead silence before Iida all but yells.   “Pardon my language, but what in the ever loving fuck.”   And even though Izuku knows the three of them are going to have a lot of explaining to do, he laughs along with the rest of the class and finds himself squeezing Katsuki and Shouto’s hands even tighter. 8. They know each other’s bodies too well now.   All of Izuku’s sweet spots discovered, every ridge of Katsuki’s toned muscles explored, every inch of Shouto’s soft skin gazed upon.   They move together like a well oiled machine, dance around each other like a well choreographed tango. Become one like separate flames merging together.   Katsuki is almost always the one to kiss first.   He pulls Izuku close and runs his tongue over Izuku’s lips before slotting their mouths together.   Shouto usually watches this from the edge of the bed, sometimes palming himself through his pants, sometimes just enjoying the view.   But today he already has his dick out.   Their normal sparring session had been far more hot and heavy than usual and the tension was thick. So thick that  it had almost been suffocating as they took the dorm’s only elevator up to the top floor and hurriedly stumbled into Katsuki’s room.   Shouto strokes himself hard and fast, and watches as Izuku lets Katsuki ravage his mouth. There’s always a lot of biting and fingers fisted in hair with Katsuki. He’s just rough enough for it to almost be too much but not quite.   Katsuki pulls away from Izuku after minutes that bleed together and swivels around to find Shouto.   He clicks his tongue.   “Impatient.”   Shouto doesn’t get the chance to retort before Katsuki swats Shouto’s hand off of himself and pulls him into an even fiercer kiss than the previous one with Izuku.   Now it's Izuku’s turn to watch.   This is usually where they fight for dominance, fight for who will take Izuku first, but today Shouto is feeling compliant. Shouto lets Katsuki overtake him completely. He lets Katsuki push him backwards until his back is against the bed.   They kiss for a few moments longer until Katsuki pulls back and pushes himself up slightly. He’s got his hands planted on either side of Shouto’s head and hovers over him slightly, knees planted on either side of his waist.   “What’s with you today?” Katsuki mumbles, eyes gliding over Shouto’s face, searching.   Shouto eyes flit over to Izuku for a second, immediately zoom in to the way he has his hand down the front of his shorts with a huge wet spot already seeping through the front of the gray fabric.   He swallows and says, “I think- I think I want you to fuck me.”   There’s a stunned silence .   It was always Shouto and Katsuki fucking Izuku. Always. They’d never really talked about it explicitly but it just fell into place like that because Izuku prefered the less dominant role. He prefered letting them have their way with him and he didn’t even need to say it for it to be clear.   But Shouto, Shouto was never quite sure what he needed. He’s never had much of a sex drive until this. Until them . And maybe it was the way Katsuki handled him. The way he could lift Shouto over his shoulder and throw him down. The way he could grab at Shouto’s neck and have him completely under control.   Shouto needed that from Katsuki.   “Shouto,” Izuku says soothingly, crawling over to them.   He swipes a hand across Shouto’s forehead, brushes Shouto’s sweat damp bangs to the side.   “Just me, or,” Katsuki asks slowly, his question trailing off.   He’s still hovering, still dragging a hawk’s eye over every small twitch and crease in Shouto’s face.   “Yeah- yeah,” Shouto replies feeling breathless suddenly.   Izuku’s fingertips are smoothing over his face, gliding over his cheeks, relaxing him.   “Okay,” Katsuki says, almost to himself.   He pushes himself up completely and sits back, straddling Shouto’s lap and quickly leans in to kiss Izuku.   “You can wait, right?” Katsuki mumbles against Izuku’s lips, before moving back and  letting his hands rub over  Shouto’s clothed chest. He feels Shouto’s dick twitching against his thigh, but he ignores it for now.   “Of course,” Izuku says quickly, “Focus on Shouto right now, yeah? I’m fine with just watching if it comes to that. You guys are so hot together, it’s- it’s enough.”   Katsuki smirks knowingly as Izuku moves away.   Shouto wants to say something, wants to protest, but if Izuku is okay with it for just this once, what is there to really protest.   When Izuku said they were hot together, he hadn’t lied. Katsuki’s palms are damn near singeing the fabric of Shouto’s shirt as he rubs his palms over clothed muscle. It’s a different feeling than what Shouto feels when he’s heating himself up. It’s blistering and bubbling, boiling over like a pot of hot water. Shouto can’t contain the “shit” that slips past his lips.   Katsuki grins at him and then they're kissing. Sex with Katsuki is really something. Both Izuku and now Shouto, could attest to that. He’s relentless and unforgiving when he’s in the heat of it. Almost animalistic, and Izuku can just barely take the worst of it. Shouto almost can’t take it at all.   Katsuki is slow and gentle where he sees fit, he’ll prep so slowly it’s almost painful, he’ll kiss languidly just to make sure they know just how much he actually cares.   But when he’s finally balls deep it’s almost like a switch has flipped.   It’s mind numbing really.   Of course Shouto had stuck his fingers up his ass before, most gay boys probably had just to test if it really felt all that good. But fucking Bakugo Katsuki was an entirely different animal.   The bed is shaking, creaking loudly, as Katsuki’s hips snap rhythmically.   Shouto can’t do anything but stare up at Katsuki with his mouth hanging open, unable to formulate anything but wet, choked moans in the back of his throat.   At some point Izuku lifts Shouto’s head slightly. It takes him a few more seconds than it should to finally register that his head is now resting in Izuku’s lap. It takes him a few seconds more to realize that Izuku’s dick is out and poking against his cheek.   He nuzzles his face against it and when he feels Izuku send a breathy moan ghosting over his face it jolts him into a babbling fit.   “Shouto,” Izuku mumbles, leaning forward enough for Shouto to feel the heat of a blush radiating from him, “You’re taking it so, so well.”   Shouto whimpers in response and then he’s gasping   Katsuki is hitting him in all the right spots. Always does. And it suddenly becomes a sensory overload.   His dick rolls around on his stomach in a nasty puddle of precum and then Katsuki grabs it.   “Look at you, all soaking wet just for me. Just for us. ”   Katsuki’s growl sends both Izuku and Shouto into a fit of shivers.   “I-Izu,” Shouto babbles, turning his head to the side and nuzzling his nose against Izuku’s dick. He gets a moan in return, that moan, and before he really has the chance to do much more, Izuku is shooting cum across his cheeks.   “F-fuck, Shou, fuck,” Izuku whines jerking his hips up slightly, letting the tip of his drooling dick smear across Shouto’s forehead.   “How can you- how did you cum just from that,” Katsuki says breathlessly.   Katsuki’s chest is all red and Shouto feels the heat of his palm increasing as it roughly jerks him. Then, Katsuki slows his thrusts, and stops jerking altogether, squeezing the base of Shouto’s dick hard.   Shouto feels tears prick his eyes because it hurts. He was so close and it hurt for it to be stopped so abruptly. His hips try to buck up but Katsuki’s grip is too strong   “Ka-Katsu-” Shouto starts, but he’s cut off by his own scream as Katsuki slides the tight grip of his deathly hot palm up Shouto’s length only once. And Shouto cums hard.   It hits him in waves. He jerks violently, eyes losing focus, his mind going blank for seconds upon seconds. Izuku pulls Shouto up slightly, hugs him against his chest, holds him tightly as if to keep him from rolling off the bed.   He feels Katsuki’s thigh with his foot and wonders if Katsuki isn’t touching him because he’s trying to hold back an explosion. His hand was extremely hot.   He wants to say something, but it comes out garbled and fuzzy.   Izuku just presses a cheek against his and mumbles something about being a good boy in his ear.   “D-d-did you cum,” Shouto is finally able to get out while Izuku rocks him slightly. His eyes are finally refocusing and he sees Katsuki peeling off his condom.   “Of fucking course I did, how couldn’t I,” Katsuki grumbles, holding up the used condom as if to show proof.   Izuku chuckles. Then there’s silence     “Fuck, I love you guys,” Katsuki blurts out suddenly, sounding out of breath for no reason.   It’s the last thing Shouto registers before passing out with a satisfied smile gracing his lips.   3. “Are you two fucking serious ?”   Bakugo is staring at them from his spot leaning against the wall. His eyebrows are knitted so tightly together that it looks painful.   They hadn’t meant to corner him in the empty hallway after classes. They hadn’t meant to spring this whole thing on him so suddenly either. But Shouto was too straightforward for his own good and Izuku didn’t have enough of a backbone to stop him.   “We are,” Izuku says, avoiding eye contact and wringing his hands together.   It’s nerve wracking really, and Izuku is scared the’ve blown it by being so forward about this. They should have tried to seduce him subtly. Should have tested the waters to gauge his reaction. This was such a huge mistake and now-   “Why?” Bakugo says, voice lower than Shouto thinks he’s ever heard it.   His face is red, but they can’t tell if he’s angry or something else.   “Why what?” Shouto asks back.   He’s staring Bakugo down, looking into his very soul and Izuku wishes he wasn’t being such a nervous wreck right now so he could see it too. See Bakugo’s soul that was so many layers deeper than the average person could ever imagine.   “W-why do you two bastards like me,” Bakugo grumbles, his voice wavering.   Shouto sees the crack as clear as day. The crack in Bakugo’s hard exterior. There’s more in there than he wants anyone to discover, but Shouto and Izuku knew. They’d both been watching too long to not know.   “Bakugo. We like you because you’re you. As cliche as that might sound, it’s the truth. We know better than to believe all that pride and obnoxiousness is the only thing inside that beautiful little head of yours.”   Shouto’s voice is smooth and soothing. He says everything so matter of factly that you’d believe anything that came out of his mouth. And Izuku knows he can because Shouto only ever tells the truth.   Izuku looks up at Bakugo’s face then. He sees a lot at once and it’s a bit overwhelming. Bakugo’s eyes are wide. He looks scared. Maybe of their emotions, maybe of his own, but it’s too hard to tell. Then there’s this microexpression flashing across his face, a twitch of the corners of his lips, and Izuku thinks it’s a smile desperately trying to spread. Maybe a cocky smirk, but the look in Bakugo’s eyes tells him it’s far from his usual confident grins. It’s something else.   “Kacchan,” Izuku finally says, making Bakugo’s eyes snap towards him, “We just care about you. It’s okay if you don’t want this, we understand it’s weird, but-”   “No,” Bakugo says, cutting him off, voice a strangled shout, “I want to try it. I want to. But just know I fucking suck at dating so don’t take all this shit back when I can’t give you what you’re expecting.”   Izuku breaks out into quite possibly his widest smile ever and when he glances at Shouto he see the other tearing up.   Izuku looks back to Bakugo and this time he’s sure that red sprouting across his cheeks is a full on blush. It takes a bit of fanning, but their fire ignites and burns strong. Please drop_by_the_archive_and_comment to let the author know if you enjoyed their work!