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Izuku Midoriya Knows Kinks (And that's Everyone Else's Problem)

Summary:

People assume that every observation Izuku has is in his notebooks.

The notebooks are just the combat viable information.

He Knows So Much More.

(It's All Mineta's Fault.)

Notes:

If you aren't 18+ leave now.

Also: this fic is *not serious* This is crack of the highest order.

For those of you who are adults: Enjoy!

(See the end of the work for more notes.)

Chapter 1: Sleep Deprivation is Killer

Chapter Text

Midoriya Izuku didn’t start with a quirk, didn’t start with the strength to shatter buildings and his own bones with a well placed punch.

 

He started with his mind, his senses, and a deductive ability that in another life would have made him a detective unlike any other. At a glance he can identify someone's mood and personality, can notice emotion and injury.

 

A few seconds and he usually knows the basics of a quirk, could tell you that one person in a crowd is a martial artist, another knows ballet, how many of them are married.

 

The longer he pays attention, the more time he has to spend, the closer he is to someone, the more he knows.

 

And that includes his classmates.

 

For most of middle school and high school he kept to himself. He could read the classrooms, could tell who was angry and at what. Gossip flowed past him, drama happened in between lessons, and a hundred small conflicts and changes happened every day. Izuku stayed a step removed, the only Quirkless kid in his class. He didn’t have friends, so much as occasional lab partners or associates who helped with one class project or another.

 

Perhaps it’s being quirkless that hid him from view.

 

Because if someone just talked to him, if they listened to him, if they confided in Midoriya Izuku…

 

He may have given them enough blackmail to put the entire social structure of the school into chaos.

 

Sadly, they didn’t.

 

So, Izuku kept quiet.

 

The information was never spoken, the details he noticed with sharp eyes and hyperactive attention merely stored and filed in his mind.

 

Of course, when high-school was over, when he broke his arms in an entrance exam, when he had his idol, his icon at his back pushing him forwards, he broke from that shell.

 

When he entered UA University, finding himself in the midst of future heroes who considered him one of them…

 

He still didn’t give information out. He didn’t even consider it. He offered notes on their quirks, recommendations on their fighting styles, occasional tips and tricks.

 

But those were only the edge of what he saw. He wasn’t just an outside observer, anymore. He was friends and rivals and allies with his class. He lived with them day in and day out for months in the university dorms, fought them in the sports festival, sparred and talked and ate with them.

 

He had more information on the members of class 1A than nearly anyone besides his mother .

 

The notebooks were merely the practical information.

 

He had no plans to reveal anything else.

 

At least… not until the end of that first year.


Izuku blinked, looking at the darkened ceiling of his dorm. 

 

He should be sleeping. He got in bed over two hours ago.

 

The room was the right temperature, the pillow nice and cool, his phone plugged in just out of easy reach to avoid temptation.

 

On any other night he would have already fallen asleep.

 

Instead, he had another issue.

 

The moaning and grunting sounds coming from the room next from him.

 

It wasn’t a real person, Izuku knew for a fact that of all people, Mineta Minoru, wasn’t going to get that lucky. The shorter man was a pervert of the highest order, and Izuku knew it was only his potential as a capture specialist and his higher then average grades that hadn’t sent him packing from Aizawa’s ire. 

 

The thing is, after a month in the dorms, Izuku was used to ignoring the odd sounds from Mineta’s room. The occasional grunts, the bed squeaking, the on and off mutterings that he drowned out and ignored. Kouda, in the room above Mineta, had a white noise machine and could cuddle with his animals, ignoring any noise that would have made it through the thick reinforced floors of the building.

 

But tonight, Thursday, Izuku couldn’t block it out.

 

Mainly because this wasn’t just a one off sound, or occasional noise.

 

This was porn.

 

Loud, porn.

 

The sound was loud enough that Izuku could make out entire sentences, when there was dialogue to talk of anyway.

 

He had already even tried knocking on the wall, and had stepped out to knock and try the man's door.

 

Only to get no response.

 

So, unwilling to cause property damage, Izuku was forced to sit there and wait.



By the time dawn came, Izuku had stumbled down to the common kitchen of the dorms, head in his hands and bags under his eyes as he nursed a cup of coffee.

 

He knew he had been awake too damn long when his mind wandered and he started to critique the acting in the porns voice lines.

 

Sadly, he also knew his own body well enough to recognize that he had hit his second wind, and there was no way he was going to get any sleep until after class, at the earliest.

 

So as he sipped his coffee, he couldn’t help the frown that crossed his face.

 

He was going to have a rough day.

 

In the back of his mind, he felt mildly bitter about that.


Hours later, Izuku pushed himself up from the training ground floor, feeling his arms and legs burn with the effort. The Heroics class today had been focused on refining super moves, the vast concrete playground of Gym Gamma had been sectioned off into areas with specific targets. From groups of targets that shifted each time they were reset for wider target attacks, to single targets that were positioned against walls and in odd positions. All to test and assist in getting ‘Super Move’ refined and practiced.

 

Izuku leaned back and took in the series of walls and columns in front of him, each one a different thickness and width, perfect for dialing in the strength of his kicks.

 

However, his exhaustion was catching up.

 

Bouncing on his heels he forced the clumsiness down, gripped tight, and launched into a back kick, focusing as he fired another air blast from his boot, the force splintering the concrete of a pillar, before a twist and a second kick snapped out and sheared it from it’s base, sending it crashing against the far wall even as he twisted back to land, before stumbling for a second.

 

Shaking his head, he closed his eyes and forced the exhaustion back.

 

And then he heard it.

 

“Damn, look at that!” 

 

Mineta.

 

Izuku turned and opened his eyes, staring with barely repressed annoyance at the area to his left.

 

Where Mineta was hanging from the walls of a concrete barrier, peeping over the top at the zone in front of him.

 

The one where Ashido was currently stretching, surrounded by half melted concrete targets.

 

And the back of her uniform was torn up.

 

It took mere fractions of seconds to figure out what her move was, a break dance style spin on her shoulders, with her legs splashing acid in wide arcs around her. The roughness of the floor must have scraped and torn at her outfits back, weakening it’s acid resistant coating.

 

‘That’s a sign of someone cutting corners. The base material should have been acid resistant, not just treated and coated in one.’

 

But Izuku put that out of his mind, Mina was currently tugging at her suit’s top, and as he heard the start of it ripping, he locked his eyes on the drooling and obsessed form of Mineta.

 

Yeah. No.

 

“Hey, Mineta.” Izuku called out, his voice uncharacteristically deadpan and harsh. 

 

When Mineta didn’t even look, a flicker of green across Izuku’s leg was all the warning anyone got.

 

The smash of an air bullet clipped the base of the thin wall Mineta was perched on, sending it collapsing.

 

The pervert on top.

 

Mina jumped, twisting, and that was enough for the back of her suit.

 

With a final tear, she yelped, arm coming up to hold the catch and hold front of her suit to her chest.

 

That was also the cue for Mineta, bruised and still covered in concrete dust to pop up hands groping as he lunged from the rubble at Mina.

 

And was caught, a scarred hand wrapped around his face and locked to his skull like a clamp.

 

Mineta could barely see past the top of the fingers wrapped around his eyes, the view of Mina obscured without remorse.

 

And what he saw was terrifying.

 

Green eyes gleamed with unholy light, the blazing eldritch glow only making the dark bags and shadows of a sleepless night darker by contrast, loose green waves casting his face in shadow.

 

“Mineta.”

 

The voice was dead. No tone. No joy.

 

Merely something like resignation.

 

As the shorter man tried to wiggle free, voice babbling, Izuku glanced away and spoke up, locking eyes at Sero, who was already swinging his way.

 

“Help Mina with her suit. I’ll take care of NTR fetish here.” Sero stumbled his landing slightly at that, eyes wide, before something in Izuku’s gaze told him to focus on Mina.

 

In the meantime, Izuku, ignoring the way Mineta was clawing at his hand, walked off with the shorter man.

 

By the time Mina was able to let go of her taped up top and not worry about flashing the entire gym, class had ended. Mineta was being stared at by an aggrieved Aizawa, and Izuku was heading towards the lockers to strip off his dusty costume and head back towards the dorms.


Izuku swayed slightly, eyes closed as he leaned on the counter in the dorm kitchen. A cup of tea was in his hand, the warmth spreading across strained joints and scars to lessen the tension as he unwound from the day.

 

Of course, as he sipped at his tea, his peace wasn’t going to last.

 

The first of his classmates had finally started to get back from the gym.

 

And in the lead by quite a while, was Ashido.

 

The pink skinned woman slid around the corner, dressed in her school uniform, her socks sliding over the tile of the kitchen as she all but slammed into a surprised Izuku, making him stagger and hold his tea out and away to not spill over her.

 

“Midoriya! Just the guy I was looking for!”

 

Izuku blinked, staring at her, as he slowly brought his mug of tea back and sipped from it, ignoring the steaming splash of tea over his hand.

 

Mina took that as an acceptance and leaned in. Her voice was serious, her gaze intent, as if she was about to ask about the truth of the universe.

 

“Why did you call Mineta NTR fetish?”

 

Izuku blinked.

 

Then blinked again.

 

Then slowly lowered his mug.

 

“Because…. He has a netorare kink?”

Mina leaned in closer. “But how do you know?”

 

Izuku blinked, again.

He was having a hard time keeping his eyes open. He was tired.

 

“It’s obvious? He’s constantly fantasising about girls and joking about stealing them from other guys. He also watches his porn… very loudly.” Izuku frowned at that, and blinked wearily at his tea.

 

He took a sip.

 

Mina leaned back, and looked thoughtful. “I guess it makes sense.”

 

Izuku nodded, eyes still locked in his cup of tea as his mouth just kept talking. “It’s not nearly as obvious as Kaminari’s pet play thing.”

 

Mina was suddenly staring at him, eyes wide, and Izuku ran back that sentence, before frowning.

 

“I shouldn’t have said that.”

 

“Wait, wait wait wait wait.” Mina leaned closer and Izuku dodged around her, tea still in his hand as she chased him “WHAT DO YOU KNOW?”

 

“Nothing. I know nothing? Secrets? Nah. No secrets.” Izuku skipped back, and ducked as Mina lunged, stepping around the corner of the kitchen island as she lunged past him.

 

“You have gossip. Please! I need it!”

 

Izuku gave a noncommittal hum into his tea.

 

It was not convincing considering that he was rapidly dashing back into the common room, angling for the elevators.

 

“You’re gonna tell me Midoriya! I need to know!”

 

Izuku dodged around another leap, and slammed his hand on the elevator button.

 

“No, I really don’t.”

As Ashido closed in, Izuku ran through his thoughts. How could he escape this? How could he distract her?

 

Information came to mind, and while normally he wouldn’t have said anything… he had no brain to mouth filter right now.

 

“Listen, I know that you would get off at exposing yourself to the public, but I don’t share your kinks.” As she stumbled, cheeks glowing a deep purple, Izuku kept slapping the open elevator button. “So please, let me just-”

 

His words died off as he looked past Ashido, freezing.

 

At which Jirou, Yaoyorozu, Kirishima and Kaminari were staring at the pair of them, all of them holding cold coffees from the Allbucks on campus.

 

Jirou raised an eyebrow, taking a long slow sip of a coffee.

 

Izuku’s self awareness woke up just enough to die on the inside.


Several minutes later, the entire group had pinned him in and shoved their way over to the couches in the corner of the living area, Izuku finding himself stuck in the corner, two solid walls behind him and the Bakusquad (with Yaoyorozu) staring at him.

 

He took a sip of tea, only to come up dry.

 

“Tea… no.” he mumbled as he stared in the empty mug with something that could only be described as betrayal.

 

Kirishima reached out, expression concerned as he pulled the mug away and set it on the coffee table.

 

“Right, you okay man?”

 

Izuku blinked, staring at the red haired man with dead eyes. “I was awake all night listening to porn filter through my northern wall. Because someone left it playing. All Night.”

 

As Kirishima drew back slowly, Ashido leaned in.

 

“Is that how you knew he liked NTR?”

 

Izuku blinked, eyes glazed over. “No, I learned that on like day three. He isn’t exactly quiet when he fantasizes behind me in class.”

 

Yaoyorozu frowned in disgust at that, Jirou joining her.

 

Kaminari gave a weak chuckle. “He’s not that-”

 

“I had to listen to five hours of badly acted NTR and Incest porn last night.”

 

The gleaming green eyes bored into Kaminari’s eyes like the pits of hell made him instantly back pedal. “Sorry… please don’t hurt me.”

 

Mina saw her chance.

 

“So what are our kinks if you know so much.”

 

Izuku snapped his gaze her way. 

 

In the back of his mind the last fragments of his diminishing sanity tried, very hard, to stop him.

 

‘THAT’S BAIT, SHE’S BAITING YOU. DON’T DO IT, DON’T-’

 

He was already talking.

 

“You’re an exhibitionist at your core, probably related to more than one clothing disaster when your quirk was still developing.”

 

He looked past a blushing Mina at Kirishima. The red haired teen looked like a deer in the headlight under Izuku’s unwavering gaze.

 

“Due to the natural dampening of your senses by your quirk you’ll like it rough. Likely with some level of masochism or impact play.”

 

As Kirishima blushed and reached up, hands on his cheeks, he locked onto Jirou, the fear and uncertainty in her eyes not stopping Izuku’s sleep deprived rampage.

 

“Vibrations. You like it loud. If someone bent you over a subwoofer while you were in the mood you’d come before you ever got touched. And let's not even get into your penchant for leather, fishnets, and high heeled boots.”

 

Jirou spluttered and Izuku moved on to Momo.

 

The taller woman was working hard to stay composed but her blush was already high and her hands shaking around her drink.

 

“Food Play.” As she buried her face in her hands, he moved to the last of the five.

 

“And you, Kaminari, just want someone to put a collar on you and pet your hair. I diagnose you with pet play.”

 

He rose, snagged his empty mug, and walked out of the disorganized mass.

 

“And, because I know you want to know!”

 

He tapped the button for the elevator. 


“Sero wants to practice shibari on someone, half the class is touch starved and wants to be tied up, Toru is a voyeur, and-”

 

The elevator door slid open and Izuku strode through.

 

“KACCHAN IS A FUCKING PILLOW PRINCESS.”

With a slam of the second floor button, the doors closed, leaving the common room in awkward silence.