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vampyrsutton · 1 year

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Shinsou X Kami X Monoma~Double Penetration

Summary:

Monoma reads about hypnosis triggers and asks Shinsou to give him some. Somehow all of them forget they have a classmate whose quirk relies on sugar when picking trigger words.

Ao3 Tags:

Double Penetration in Two Holes, Kinktober, Kinktober 2021, Double Penetration in One Hole, Hypnotism, Consensual Mind Control, hypnosis triggers, a lot of cum, Deepthroating, Face-Fucking, Sex Toys, Quirk Shenanigans (My Hero Academia), Inappropriate Quirk Use, Quirk Kink (My Hero Academia), E-stim, electric stim, Threesome - M/M/M, Kaminari Denki Has ADHD

Notes:

Thank Horikoshi for a world where it's a bit easier to ignore human limits 🙏

“You sure you want to try this, Mon?” Shinsou asks for what has to be the millionth time.

Monoma just cocks an eyebrow, looking to Kaminari in question. “Was he like this with you, too?”

“Isolation does shit to you, man.” Denki just shrugs from where he’s playing on his phone.

‘Don’t I know it.’ Monoma sighs, looking back up at the purple-haired insomniac. “Yes, Shin. I’m sure.”

Shinsou sighs, deciding to stop beating around the bush. “Okay...Are you su-”

“Oh for fucks sake y-” Monoma’s mind clouds with static as he stares blankly into space.

“Good boy,” Shinsou smirks. “Now we just gotta program those triggers he wanted.” He hums as Kami shows him the list on his phone. “I’m surprised he actually wants one for chilling out.”

“Babe, that’s the one you put for your free space.” Denki laughs at his sleepy boyfriend. “Remember when you were half asleep last night?”

“Oh yeah. I’m just getting tired of having to be the one to reign in Bakugou whenever Kirishima is with Fat Gum.” Shinsou chuckles, taking the phone to look at the list better. “I think I know which one is your free spot.”

“The cooking one yeah. He makes really good ramen from scratch.” Denki hums as he now plays with a loose thread on his shirt.

Shinsou’s head snaps up as he blinks. “I thought it was the kinky one?”

Denki just smirks now. “Nope. That one was all him.”

Shinsou groans as he reads it again, already getting horny with the possibilities. “I think I know why Dad warned me against loud blondes now. You two are gonna be the death of me one of these days.”

“I can still ask Bakugou if you wanna add another~” Kaminari teases.

“I’m pretty sure Kirishima would kill me if you did. Those dating the other blondes are already suspicious enough.” Shinsou chuckles with a shrug. “Back to the triggers though. I think you should pick them since you’re the most likely to shout random words, and we don’t want to set him off without meaning to.”

Kaminari takes his phone back momentarily to type furiously. It dings a second later. I asked Kendou for a nickname to call her so she still knows to get him if we’re not around, she just doesn’t know it will also subdue him. Kenken can be his chill button.” Denki hums, handing the phone back.

Shinsou raises an eyebrow but gives the small blonde a proud smile. “Well, look who’s using their brain.”

Denki grins proudly as Shinsou programs the trigger, the lighter blonde nodding blankly. “How about Sweetie for the dirty one? No one here calls their S/O that so there shouldn’t be any accidents.”

“Sounds good.” Shinsou nods, programming it in. “Okay, next.”

They continued on until they made it through the list, adding a few small ones on the way to really only use if he got himself too worked up. Once they were done Shinsou released his quick and smirked as Monoma blinked at him in confusion.

The lighter blonde kind of looked himself over before tilting his head. “Should I feel any different?”

“Not really.” Denki is the one to answer. “You won’t unless someone uses one.”

“Hmm, okay I guess.” Monoma shrugs with a slight flush on his face as he looked away. “So...are we going to try any of them?”

The other two smirk at him wickedly.

“Nope.” Shinsou snickers. “Half the fun of that type of trigger is the anticipation.”

“Can I at least know what they are?” Monoma pouts.

Shinsou just tilts his head, smirk not leaving his face. “Nope cause the second you’re feeling bratty, you’ll goad someone into saying them.”

Monoma crosses his arms now but can’t deny it so just huffs. “Whatever. Let’s go, we’ve got joint training in like 15…” His eyes widen as he looks at his phone. “FIVE Minutes?! What the hell?”

“Calm down we’re right next to today’s training grounds.” Shinsou yawns. “I’ll just use my capture weapon to get us down there in time.”

Monoma’s eyes widen as he starts making a break for the door. “Hell no, you Spiderman wanna be! I saw you practicing with Tape Boy again and I rather liked today’s breakfast so-”

“Guava.”

Monoma freezes, unable to move. “I hate you sometimes.”

“No, you don’t.” Kaminari laughs as he pulls Monoma over to the window and their waiting boyfriend.

“I want a divorce.” Monoma huffs as he’s hoisted into Shinsou’s hold.

“At least let me put a ring on it, damn.” Shinsou deadpans, bursting out laughing at how red Monoma turns.

“Shut u-AHHHHHHH!” Monoma screams as Shinsou launches them out the window, Shinsou teasing him the entire time.

~~~

A few days go by since the triggers were added and between homework and training, the trio kind of forgets about them. It isn’t until the next Friday when they’re chilling in the Class 3-A commons that something happens to change that.

“I made treats!” Sato calls from the kitchen where he had finally managed to fight Bakugou out to let him bake. “Anyone want some?”

“Oh! What kind?” Kaminari jumps up from where he was previously draped across his boyfriends’ laps.

“Edible cookie dough! My cousin got ahold of the Sweetie recipe!” Sato grins, bringing a small paper cup out for the excited blonde.

Monoma, meanwhile, has to clamp a hand over his mouth as the reaction is immediate. As soon as he hears the word heat flashes through his system and his blood rushes south so fast he feels light-headed. He has to fight not to moan as he pants in Shinsou’s ear from where he was previously resting his head on his shoulder to watch something on the smaller blonde’s phone.

“Shin-Shinsou.” Monoma groans, trying to be quiet. “What’s happening? I feel like I’m on fire.”

Shinsou looks at him in worry before he feels something similar to when he uses his quirk and it clicks. “Shit. He said one of the words. Don’t worry, Mon, you’re okay. Just let me grab Denks and we’ll take care of you,?” He waits for Monoma’s shaky nod. “Can you walk?”

Monoma tries to push himself up, but immediately just falls limp. “How word for word did you read the list?” He whimpers quietly, trying not to alert anyone else in the room of his struggle.

“Verbatim? Wh-?” Shinsou’s eyes widen. “Please tell me you didn’t get it from one of Denki’s notebooks.”

Monoma nods helplessly. “Yeah, why?”

“Which one?” Shinsou sighs, suddenly glad Denki color codes his books so he doesn’t accidentally turn in the wrong notebook again.

“Uh, red I think?”

Shinsou sucks in a breath. “Why the hell would you grab something from there?!” He whisper-yells, cursing himself for not paying attention to what he was saying. He grabs Denki’s abandon phone to bring up the list.

When you hear ___, you will turn into a bitch in heat until you either pass out or can’t hold any more of our cum.

‘I should have listened to Dadzawa.’ Shinsou internally groans. “Why did you pick the horniest notebook? Purple or Green would have been fine, but Red is not where you go for triggers.” He hisses as he pockets Kaminari’s phone and collects the trembling Class B menace into his arms.

“I didn’t think it’d be this bad.” Monoma whines in Shinsou’s ear. “I feel like I’m going to actually go crazy if I don’t get a cock in me soon.

“For something like that, my quirk will make your body respond however it interprets it. If you had a single dominant bone in your body, even I’d probably have to bottom to get you out of this.” Shinsou sighs, signaling to a very concerned Kaminari that there’s an emergency.

“Can’t you just hypno it away again?” Monoma whimpers, trying to be sneaky about getting his hand down his pants.

“For something like this? No. It’s not really a part of the brain I’ve trained my quirk in so a reaction this strong wouldn’t just turn off.” Shinsou sighs as Kaminari catches up at the elevator.

“I got each of us a cookie dough. What happened?” Denki asks worriedly once the doors close behind them.

“Sato said one of the trigger words and we apparently both need to pay more attention,” Shinsou explains. “Remember the horny one? Well, neither of us noticed just how horny. He got it from your Red notebook.”

Kaminari’s eyes widen in horror before looking at Monoma in worry. “Oh, baby, are you okay?”

“I feel like I’m gonna die.” Monoma whimpers as he clings to Shinsou, furiously palming himself through his boxers, knowing Shinsou has him hidden from the camera. “It’s like there’s actual fire in my veins and if I don’t get a dick in me soon I might break.”

Kaminari’s face flames red as he movies closer to pet through light blonde locks. “Don’t worry we’ll take care of you, babe.” He looks up at Shinsou. “What did it say again?” His memory not the best in general.

“Front right pocket.” Shinsou sighs, lifting Monoma a little higher so Denki can fish out his phone.

Denki opens up the list and Shinsou swears he can see steam come from the blonde’s face. “This is from my breeding story.” He squeaks, looking at Monoma in horror. “If you wanted to be fucked stupid you could have just said so!”

Monoma moans loudly at the words, burying his face in Shinsou’s shoulder in embarrassment. “...I didn’t want to chicken out.”

The other two look at him fondly, Shinsou kissing his hair.

“We could have just tied you up or something, Mon.” Shinsou chuckles. “No need to torture yourself.” They watch the blonde’s face turn even redder as they walk out of the elevator. “Oh? Was that your true plan?”

There’s no response for a second before Monoma whines. “Denki might have told me about the dildo adventure, but I still wanted to be coherent.” He mumbles into Shinsou’s neck.

Kaminari burst out laughing at the other blonde’s phrasing as he opens Shinsou’s room. “Oops, guess I really am a bad influence.”

“All the time.” Shinsou chuckles. “Though what did we say about leaving notebooks in the open?” He hums as he kicks the door shut behind him, smirking at the knowing chuckle that comes from his shoulder.

Denki gulps, rubbing his neck. “Oops?”

“Color?” Shinsou hums, laying Monoma on the bed and helping him get his clothes off.

“Green,” Denki says without hesitation before his mind goes blank.

Shinsou snickers as Denki stands there slack-jawed before he looks to Monoma. “Look at that, you have a new toy. What do you need, baby?”

Monoma whines loudly now that they’re in private, already trying to get to the lube in the bedside drawer. “Inside, now. Fuck, honestly you could probably literally break my back right now and I would thank you just please!” He rambles, finally getting the bottle and squirting some on his hand, shoving two fingers in carelessly and keening at the stretch. “Please just get something in me now!”

Shinsou raises an amused eyebrow as he sits on his desk chair. “Alright. Denki, eat him out until I say stop.”

Monoma’s head snaps to the side to stare at Shinsou in horror, knowing just what the smaller blonde’s tongue is capable of and finally remembering just who his ass is in the hands of. Then he brushes his own prostate and is back to begging, whining when Denki pulls his fingers away and manhandles him to his stomach with his ass in the air.

Monoma scrambles to get a pillow under him so he’s not at such a weird angle before moaning loudly when the other’s tongue slips inside of him with the help of the lube. He claws at the sheets as Denki fucks his tongue into him, finger slipping when he can to allow him more room, and Monoma yelps when he feels a small zap at his rim.

He’s mortified to feel his cock at the feeling, and whines lowly. “Ah! Denki! Your quirk! AHHH! There! Please!”

Shinsou chuckles as Monoma tries to beg the other boy who can’t listen. “Find his prostate, and do as you wish.” He orders Denki.

Monoma has to bite the bedspread to prevent himself from screaming when Denki manages to start tonguing his prostate, occasionally zapping it while he does. “Oh fruk fruk fruk!” He chants into the bedspread, trying to grind back on the tongue in his ass as he nears his orgasm embarrassingly fast. “Cumming! Fuck Den-”

“Chartreuse,” Shinsou smirks.

Just like that Monoma’s orgasm is stopped as he cries out. “NoOoo! Shinsou! Please! Please let me cum! Please, I’ll do anything!” He whines, humping the pillow beneath him as he desperately tries to cum.

Shinsou just chuckles, leaning back in the chair as he strokes himself at the site of the normally cocky blonde crying and begging for his release. “Oh, will you now?”

“Anything!” Monoma whimpers. “Please!”

“Okay. Then don’t move until I say.” Shinsou smirks evilly. “Understand?”

“Yes, please. I’ll stay still. I won’t move. Just please let me cum.” Monoma practically sobs.

“Periwinkle.”

Monoma’s vision whites out as he cums hard across this pillow, desperately rutting into it as e rides out his orgasm, but comes back to his senses fast enough when the electrified tongue inside him doesn’t stop, and instead another finger is added. “Denkiiii~ Too much!” He whines, wanting to wiggle away, but not wanting to get punished.

“He was told to continue until I said stop remember?” Shinsou hums.

Monoma’s eyes widen as he looks at him in betrayal. “You tricked me!”

“Yup,” Shinsou smirks, digging in his bottom desk drawer. “Denki catch.”

Denki has no problem catching what is thrown at him and Monoma whimpers when he realizes it’s the dildo he mentioned earlier. The purple one Jirou had gifted Denki as a joke that definitely belongs in the monster fucker category of hentai. “You wouldn’t.” He whispers, knowing full well Shinsou will.

“Denki stop. Fuck him with it until he cums again… And turn his face to the edge of the bed.”

Denki mindlessly does as he’s told, moving Monoma so he’s facing the purple-haired boy before starting to work the massive dildo into the other twink.

Monoma cries out as he’s split open, and that’s apparently exactly what Shinsou was waiting for as he grabs light blonde hair and forces the open mouth on his cock. “

Use your safe actions if you need to.” He warns as he sinks into the blonde’s throat.

Monoma whines, gagging slightly at the intrusion but doing his best to breathe through his nose even as the breath is knocked out of him from behind. He swallows and whines around the cock, but by the time his nose is buried in purple pubes, he understands just how badly his brain has screwed him over as he sucks and swallows like his life depends on it.

Shinosou stares down at him in amusement, positive that if this was one of Kaminari’s stories, the lighter blonde would have hearts for pupils as he tries to choke himself on his cock. “God, you’re such a little cum slut aren’t you, Mon?” Shinsou smirks.

Monoma moans at the words, sucking hard as he begins to fuck back on the dildo that’s buried to the hilt in his ass. He actually whines in protest when Shinsou starts sliding out before gurgling happily when he slams back in, not a care in the world if he’s choking on it.

“Fuck, you’re so gone.” Shinsou groans, gripping blonde locks tighter to get a little more room before starting to abuse the normally mouthy blonde’s throat.

Monoma looks like he’s on cloud nine as he lets himself be used, moaning whenever the massive dildo in his ass catches his prostate and grinding back on it to chase the feeling. If he was in his right mind he’d probably wonder how the thing even managed to fit, but right now all he cared about was being full.

Shinsou looks up to check on Denki and the bulge in his pants. “Oop. Denki strip. You can fuck him after you do.”

Monoma moans loudly and Shinsou thinks he might be trying to beg around the cock shoved down his throat, but he doesn’t let up long enough to find out. Even if he wasn’t watching Denki, he would have known the exact moment he sunk into Monoma just by how the lighter blonde moaned around his dick and clawed at him. Monoma has to be gaping from the previous toy, but neither blonde seems to care as Denki gasps, sinking into him slowly.

Shinsou pulls out of Monoma’s mouth long enough to ask something. “Think you’re stretched enough?”

Monoma doesn’t even ask what for and just nods frantically while trying to get Shinsou’s cock back in his mouth by pulling on his thighs.

“Fuck, Mon. This trigger really messed you up, huh?” Shinsou hums, giving the blonde what he wants when he starts whining. “Okay, okay. I got you, baby. Calm down.” Shinsou coos, sinking back into Monoma’s mouth who hums happily. “Alright then, Denki reenact your story.”

Monoma’s eyes snap open in shock before he’s crying out around Shinsou as the other blonde starts pounding into him like a wild beast, biting and snarling included as he makes Monoma arch into the mattress.

Shinsou moans when this consequently fucks Monoma onto his cock at a much rougher speed and it isn’t long before he’s cumming down the blonde’s throat.

Monoma whines, sucking and swallowing like he nee the other boy’s cum to live and, if Shinsou didn’t know any better, he would think he might. He notices how Monoma trembles and looks down to find he had cum again and was in the process of being fucked into over sensitivity, but making no move to stop any of it as Denki did his best to lay over him as he fucked him hard and fast.

“Shi-Shinsou~?” Monoma whimpers, making grabby hands. “Not enough. Need more.”

Shinsou kneels in front of him and pets his hair as Denki cums in him, but keeps going. “Give me just a few minutes and I’ll help you, okay, Mon?”

Monoma hiccups, but nods, clawing at the sheets as Denki continues to pound his cum deeper into him. “I-Is he gonna be okay d-dOing this?”

Shinsou hums, knowing what Monoma means. “He made himself come quite a few times on that dildo when I hypnotized him so he should be okay, but I might be able to help him a little more. I’ve been working on helping to expand limits while people are under my control so allies don’t get hurt when being used as puppets. I should be able to use it here a bit.” He decides, looking back up to Denki and missing the considering look in Monoma’s eyes.

“Denki, fuck him like you’re in Mina’s Omegaverse fanfic and are in rut.” Shinsou deadpans, making Monoma laugh in surprise before immediately choking on it when Denki snarls and goes impossibly harder.

Monoma’s eyes roll back in his head as his prostate is continuously abused, moaning loudly when Denki moves back to sit on his ankles and pulls the slightly taller boy onto his lap to fuck him at that angle. He’s so out of it that he doesn’t even notice when Shinsou has to start taking advantage of Monoma’s already sloppy hole and start working his way in next to Denki.

Denki, in his hypnotized state, apparently took the rut thing a little too literally and growls at Shinsou before biting into Monoma’s shoulder possessively and making the poor boy cum again. This, luckily, also drew another orgasm from Denki as well waking him relax just long enough for Shinsou to slam in and make both blonde’s cry out.

Monoma shakes as the boys work orgasm after orgasm out of him and themselves, steadily filling him up and slowly calming him down. He does whine, however when Shinsou has to pull out from sensitivity.

“I know, Mon. I’m sorry, but unlike Denki right now, I still have to recover.” Shinsou coos, shushing the whimpering blonde.

“Let-AH!-Let me borrow your quirk?” Monoma hiccups, wanting the other boy back inside him.

Shinsou furrows his brow before realizing what Monoma’s getting at and trying to figure out how he feels about the idea. “...Just a moment. Give me a one-time trigger then release it. I still need to be aware to make sure you two stay safe.” He finally relents, kissing the blonde’s forehead. “And remind me to stop spilling quirk info to you.” He smirks.

Monoma manages to chuckle even as he moans at Denki spilling into him again. “He-Hey, ShinsOu?”

“Yeah?” Shinsou responds before his world goes black for a few seconds and he looks down to a shit-eating grin on Monoma’s face. “If you did anything unauthorized, you will get punished later...actually no you’d like that too much, you’ll just get the silent treatment for a bit.”

Monoma pouts for a moment before the smirk returns. “ShinShin?”

Shinsou about collapses with how hard the new wave of arousal hits. “Holy shit.” He pants out. “What was the exact command?”

“Fuck mE-AHH!-l-like an animal until my trigger ru-rUns out,” Monoma answers without hesitation, knowing it’s a bit more important for the one with experience to know. “Which is probably gOing to be whenever I pass out at this rA-FUCK!-rate! Oh god, Shinsou please.” He whines.

Shinsou growls low in his throat at the plea and wonders if his body decided to copy Denki as he pulls the light-haired blonde’s mouth down onto his cock and actually makes him choke on it this time.

Turns out, Monoma had a lot more stamina than he thought as he ended up leaking cum and with a full stomach to end his trigger and snap Shinsou out of his so he could stop Denki who looked at the delirious lighter blonde in shock.

By the time they were done, Monoma was drolling and blissed out, claw and bite marks covering his body and cum dripping out of his at this point gaping hole as he slurred nonsense.

“Holy shit.” Denki groans as he collapses to the side, barely conscious himself now that he was no longer mind-controlled and was just as exhausted as the other blonde after having his balls drained. He has no clue how he even managed to produce that much and wonders if he’ll be able to cum for the next month without Shinsou’s help.

“Yeah.” Shinsou pants flopped on his back with his legs hanging off the bed. “We’re turning that one off.”

Monoma just gives a shaky thumbs-up, not arguing.

“Monoma?” Shinsou asks.

“Y-yeah?” He manages to rasp before blanking out.

Shinsou undoes the trigger before giving Monoma control of his mind and body again who does pass out now that there are no lingering after-effects.

“New rule. No more sexual triggers without having a full, new kink level discussion.” Shinsou groans, trying to mentally and physically prepare himself to drag his boyfriends to the bathroom for clean-up and aftercare. He groans louder when he gets no response and finds Denki has passed out too. “Dammit, you two.”

Denki snores and suddenly Shinsou is up and taking care of them, getting them cleaned up (and out) and massaging out what are bound to be sore muscles before wrapping them up in blankets and individually carrying them to Denki’s clean bed to cuddle. By the time he makes sure there are water bottles and the cookie dough on the nightstand, he realizes Monoma did in fact add another trigger and smiles down at the smiling, bruising blonde who is hugging their resident Pikachu close in their sleep.

Both know Shinsou gets antsy when something delays aftercare so he can’t find it in him to be mad for the unauthorized trigger as he goes to take care of himself.

“Good boy.” Shinsou smiles, kissing the lighter blonde’s hair when he crawls in behind him a few minutes later. He hears a dazed but happy hum as he pulls the blanket over them before joining them in sleep.

The next morning they’d be met with a very annoyed Aizawa who had to deal with the noise complaint, but not a single one was sorry as they just smirked at the teacher who was muttering about loud blondes and Present Mic calling him a hypocrite.

Yeah, they had no regrets.

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