Archive of Our Own

Izuku had always found reality to be such an intriguing thing.

After all, what determined reality varied from person to person. A person’s perception could change over time, or even in an instant. And more often than not, people were hesitant to let go of their accepted reality. So often, people just accepted the reality they were taught by another or built a reality for themselves that felt the safest. Naturally, his wonderings about reality meant he found dreams to be deeply fascinating as well. Dreams were a peek into how a person’s mind constructed a reality for them.

When awake, external input and interactions contributed to a person’s reality. But when asleep… then reality was left up to the subconscious mind, building something from scratch, drawing from preexisting memories.

And dreams always came up with such warped, bizarre stories. They used memories of people and their faces to fill in the blanks. Loved ones, acquaintances, and enemies alike were cast to play roles in whatever reality the dream decided to create. The dreams setting could be a familiar place or a vague location, or even an unfamiliar place that felt like a familiar place.

And yet, despite all that… to the person dreaming, that was their current reality.

Within a dream, a person could be thrust into any world or situation, and they would simply accept this. There was no questioning how they had arrived at a specific location or why they were doing a specific task. Despite being thrown into an unknown, ever-changing reality, a person would allow themselves to be dragged through whatever their subconscious decided to show them.

And a person who was dreaming would be none the wiser about just how strange things were… up until the moment they began to wake. It was only in retrospect that a person could tell just how odd the dream was.

Izuku had always had such vivid dreams, ever since he was a child. He spent countless hours thinking back over the storylines, trying to recall what had occurred, and attempting to put those recollections into words.

So naturally, when Izuku learned about dream sharing, he wanted to know more.

Dream sharing was accessed through a specific device. This device utilized a synthetic chemical injected into the veins of two or more people in order to link them into one dreamscape. Within the shared dream, two people took on two different roles—the dreamer and the subject.

The dreamer acted as a sort of architect of the dream. They constructed the space in which the dream occurs—designing the setting in which the dream takes place, as well as some details about reality. A dreamer’s subconscious could also have an effect on the shared dream itself or the desires of the others in the dream.

Meanwhile the other person took on the role of the subject. The subject was the person who was “hosting” the dream in their subconscious. Essentially, the dream was theirs. The subject may or may not know if they were dreaming, depending on if the person was trained in dream sharing, or if they were given a certain dose of the dream sharing chemical. Since the subject’s subconscious was where the dream is technically taking place, their subconscious memories filled in any gaps left by the dreamer’s design—any people in the setting, for example.

Years of fascination and study led Izuku down the road of dream sharing. There was a high demand for skilled dreamers, with a wide variety of clientele that had different requests for the dream. The technology was used for everything from interrogation to information gathering to escapism to mental health services.

And Izuku was one of the best dreamers in the business. Over time, he mastered the craft of shared dreaming, now able to construct dreams to be whatever his clients wished.

He was able to construct and control dreams to be whatever he wished, too. He had such a deep connection to his own subconscious that he could manipulate subjects and their dreams to be influenced by his own desires. It was like second nature now, to maintain control of the dream and even a degree of control of the dreamer in a way that few people could do.

As much as he enjoyed his job and often dreamed for the sake of his work, Izuku would be lying if he said he didn’t enjoy making use of his skills in his free time. There was so much fun to be had within a subconscious mind, and even after all this time, Izuku loved to explore and see how much reality within a dream could be stretched…

Katsuki’s leg bounced rapidly under his desk as he tried and failed to focus on the lecture. His skin was flushed hot, and his cock was hard inside his sweatpants, and he was surrounded by his fellow students.

The lecture hall was massive—hundreds of students packed into nearly every seat, in a half-bowl shape that sloped upwards the further away from the center that one got. In the center was practically a stage, with a desk and a podium to be used by any professor who needed them. The giant projector screen at the front of the room allowed for the professor to put up whatever was needed to assist with learning—very often, presentation slides of some kind.

It was the worst possible place to randomly pop a raging boner, and yet here Katsuki was. His cheeks burned from the embarrassment. He was a goddamn college student, and yet he was getting a surprise hard-on in the middle of lecture?! What was he, a middle schooler that had just gone through puberty and learned what sex was?! Not only did he have a raging erection in the middle of class, but it was refusing to go back down.

It was all Katsuki could do to not breathe loudly and heavily. His arm was braced across his lap, hoping to hide the tent in his pants in case any student around him looked over. His whole body felt hot, certain that there were eyes on him as he tried to sneakily glance around at his peers—hoping desperately that no one was looking his way. As far as he could tell, everyone was focused on the professor and the very important lecture that he was giving with material for their upcoming exam.

But Katsuki couldn’t focus no matter how much he tried, because his cock was so hard it was throbbing in time with his heart pounding in his chest. His skin felt hot and hypersensitive, and almost itchy. He was so horny and desperate that he genuinely felt like he was losing his mind more with each passing second.

At the front of the class, someone asked the professor a question, and the professor’s light, contagious laugh echoed through the room. Katsuki’s eyes flitted to look at him, clenching his jaw as he glared at the very reason his cock was refusing to soften.

The professor was a man named Izuku Midoriya. He was a cheerful and nice guy, always very understanding and kind to his students but definitely not a pushover. He was simply the kind to have a very particular way of maintaining control of his classroom. The kind that maintained authority while rarely raising their voice. The “I’m not mad, I’m disappointed” type. Still, he was overall a pretty chill professor. He’d introduced himself by saying they were all adults here so they were welcome to call him whatever they liked—Professor Midoriya, Professor Izuku, or even just Izuku.

He was also one of those deceptively in-shape nerds, the ones who you’d never guess were jacked until they decided to wear something form-fitting or twisted in such a way that allowed people to catch a glimpse. He had curly green hair, bright green eyes, and a smile that made butterflies erupt in Katsuki’s stomach.

Hot, capable, smart, strong…

And fuck… Katsuki wanted the professor to slam him into his desk and rail him from behind.

No, no, no, no! Katsuki squeezed his eyes shut. He could not think about that right now!

Too late. His cock throbbed. By now he felt wet because of how much his cock was leaking into his pants. He needed some relief, any kind of pressure on his cock, but he was in class, so touching himself was very out of the picture. What if he did, and someone saw? What if the professor saw?

A moan escaped Katsuki’s mouth as he hunched forward, his hips jerking against his will as they sought any kind of friction. He almost wanted to hump the air despite how it wouldn’t do anything, he felt increasingly mindless with need. What if he thrust against the small writing desk that was attached to his lecture chair. It would be hard and likely painful, but at least it would be something rather than—

“Bakugou, was it?”

Katsuki’s head snapped up at the sound of his name spoken in the professor’s smooth, deep voice. His eyes flew open wide. Heat flooded his face as he registered how practically every student had turned to openly stare at him. Not to mention, his fucking professor, who was looking up at him with a questioning expression.

“Y-yes, Professor,” Katsuki called back.

“Well, Bakugou, unless you have a relevant question or comment, I’d appreciate it if you’d respect the time of your fellow students and keep quiet.”

Katsuki stared at him in confusion. It took him a second to realize… obviously he had fully moaned out loud—and loud enough for everyone to hear it at that.

Despite Katsuki’s attitude always earning him a delinquent association, he was actually a good student and a careful rule-follower. He didn’t always care whether or not his teachers or professors liked him. After all, he got good grades because he was smart and a hard worker, not because he was a suck-up. But with instructors he liked and respected, he usually tried to make some effort to not be on their bad side. Depending on who it was, he even worked hard to make sure they knew how much of a good student he was.

And Katsuki couldn’t stand the idea of this professor thinking of him as “guy who moaned loudly in class once.” The very thought made him want to pass out from embarrassment. Professor Izuku was not only smart and likable, but he was hot and exactly Katsuki’s type. If he was being fully honest with himself, he wanted his professor to think highly of him—at the very least.

Even so… Katsuki had to shift his hips around, trying to hide the fact he was squirming and breathing hard. Trying to hide the fact that—rather than going down—his cock was only throbbing and twitching from all the eyes on him.

“Understood, Professor.” Katsuki jerkily nodded. “Sorry.”

Professor Izuku’s eyes stayed on him a moment longer, appraising him. Then he nodded, turning back to the projector. “As I was saying…”

Katsuki’s eyes caught on the professor’s shoulders as he turned to face the projector. He was wearing a button-down suit with rolled-up sleeves today. When he reached up to point at something being displayed, as he continued the lecture, the fabric pulled tight in some places. The muscles in his arms and shoulders shifted enough to be seen through the thin fabric.

Just like that, Katsuki’s mind wandered again.

What Katsuki wouldn’t give to have the professor’s huge hands wrap around his waist… use the grip to fuck into him harder… maybe if there were mirrors of any kind, Katsuki would be able to see the muscles shifting in his back as he did it… hell, what he wouldn’t give even to just watch as the professor fucked someone else stupid.

Katsuki’s cock pulsed, and his breath hitched violently.

I need to get the fuck out of here. He realized all at once. Not only was his cock not going down, but he genuinely felt like he was getting closer to orgasm just from his own fantasies as he stared at his professor.

Katsuki grabbed his bag, shoving his notebook and things into it as he tried to ignore the eyes that lingered on him and the way his erection was straining to break free. He didn’t even want to look and see if there was a wet spot on his sweatpants—he was sure there was.

Why the fuck did he wear these today? Even for a morning lecture, opting for boxers and loose gray sweatpants had been the worst move possible. They were doing nothing at all to assist in hiding his current situation.

Katsuki stood, careful to loop his bag over his shoulder but hold it in front of his crotch. Without any kind of sweatshirt to tie around his waist, it was the best he could do. All he had to do was get out of this lecture hall, and he could make a break for the nearest restroom.

“Bakugou, love the enthusiasm!”

Katsuki jolted when the professor addressed him again, his head jerking to look at him. Now, the professor was beaming up at him.

“Leave your bag where it is, it’ll only take a moment,” Izuku said, clearly waving him down.

Katsuki was frozen in place. His chest heaved, his face burned, his cock unhelpfully throbbed, and he stared down at his professor.

“What?” he asked, bewildered.

“When I asked for volunteers, you didn’t think you’d be able to do it from up there, did you?” Izuku chuckled, lighthearted teasing that was clearly meant to be friendly rather than mocking. “Don’t be shy, come on down!”

Katsuki fully panicked as he belatedly realized that he must’ve accidentally stood up right when the professor had asked for volunteers. “W-wait, I didn’t—”

“Come on down, it’ll only take a moment.” Izuku smiled encouragingly. “But I would appreciate a bit of hustle, as we do need to get on with the lecture!”

Izuku’s charming smile made Katsuki pause… as well as momentarily forget his sanity. In a desperate attempt to please, Katsuki did what he was told, dropping his bag and starting to make his way down. He was a few steps in when the pulse of his rock-hard cock nearly made him trip, but he was already in too far. He couldn’t turn back now. He folded his hands as best he could in front of his crotch as he squeezed past his fellow students.

He was sure he heard snickering. He couldn’t stand to look at anyone. His face was on fire. His whole body was on fire. Yet he could only keep stumbling forward until he made it to the steps, walking down them towards where the professor was waiting. With every step, his cock bobbed up and down and he was sure based off the whispers from his classmates that his hands being held in front of his cock were hiding very little.

Katsuki was certain he was blushing from his head to his toes by the time he made it to the bottom of the stairs. He met Izuku’s eyes, who was still smiling and beckoning him over. His feet walked forward, dragging him along with them, walking right up to the professor.

“Bakugou—” Izuku leaned in and lowered his voice. “Remind me of your first name, again?”

Katsuki knees trembled. His abs clenched and cock twitched. Izuku was so close. The entire class was staring at them. He felt so aware of all the eyes on him.

“Katsuki,” he muttered through gritted teeth, staring pointedly at the ground rather than look at any of the hundreds of his peers who were staring at him.

“Katsuki! Wonderful!” Izuku clapped his hands together once, smiling that broad, charming smile. He was even more handsome up close, with all his freckles visible and those vibrant green eyes… “Go ahead and take off your clothes for me, Katsuki.”

Katsuki’s heart dropped to his toes. “What?”

Izuku paused, shooting him a look as if Katsuki was the one who’d just said something weird. “It’ll just be during the demonstration. Then you can put them back on and return to your seat.”

“I—” Katsuki’s face burned. He couldn’t—he couldn’t do that, could he? He looked frantically from his professor to his peers, who were now all watching him with unhelpfully blank faces. “I have to? What, like, my shirt?”

“No, no, everything.”

“Everything?!”

Izuku directed a more focused look at Katsuki, then he seemed to register Katsuki’s panic. He walked forward until he was standing next to Katsuki. He took hold of his upper arm gently, facing away from the class as he spoke quietly right next to Katsuki’s ear. “Are you alright?”

Katsuki knew he was just being nice, but Izuku’s proximity made his hips sway as he suddenly fought with not only the heavy, dripping weight of his cock but also a sudden feeling of emptiness in his ass. Fuck he was so turned on right now…

“I explained the requirements of the demonstration before I asked for volunteers, remember?” Izuku said. “And if you’re deciding now that you can’t do this, that’s fine. I’ll ask another student to—”

“I can do it,” Katsuki interrupted him sharply, almost automatically.

He snapped out of his daze, realizing quickly that if he didn’t agree that it would be revealed that he wasn’t paying attention to the lecture. And sure, he hadn’t been, but that was just because he was distracted today. Normally, he was a very attentive student, and he didn’t want his professor to think otherwise.

Not only that, but he realized, as embarrassing as being naked or being hard was, surely it was much more embarrassing to be unable to do a simple task that his professor was asking of him. He didn’t want to look weak or incapable in front of his peers, and definitely not in front of Izuku.

Katsuki immediately ducked to the side, yanking his shirt over his head. He could do this. He could do this better than any of these side characters. He would be the best at whatever the hell Izuku wanted him to do. He just needed to figure out what it was that this demonstration even was, and then he’d be the best at it.

His hands were on the waistband of his sweatpants before his situation gave him pause again. In a momentary panic, his head jerked up to look at his professor, who was looking over him with a very clinical, curious sort of expression. As if he were a particularly interesting specimen. He clearly eyed Katsuki’s visible erection—the outline of it on his sweats as well as the wet stains from how much he’d been leaking—but he didn’t seem to think it out of the ordinary.

“Professor,” Katsuki said as quietly as he could, heat rising in his cheeks even more. “Is it—I mean—is it okay if—”

“Don’t second guess yourself, Katsuki! You’re perfect for this!” Izuku smiled, walking over to stand in front of the professor’s desk and leaning back against it. “You’re so toned—I couldn’t have picked a better example!”

Katsuki’s first instinct was to preen from the praise, but it was followed quickly by confusion. Example of what? What the hell even was the demonstration? What class was this? He turned to glance up at the projector screen, and the presentation slides currently displayed on them.

Body Systems: Muscular System

Right. This was an Anatomy & Physiology lecture. He’d been so out of it he’d forgotten which class this even was for a second there. He jerked his gaze away, shoving the thought from his mind. He was determined to not let on how distracted and unfocused he was today.

Jerkily, unable to help how stiff and awkward and exposed he felt, he shoved his sweatpants and boxers down all at once, kicking out of his socks and shoes as fast as he could. Somehow, getting completely naked as fast as he could felt better than dragging it out. He tried to relax, tried to project confidence, but he struggled. His face was on fire, and he immediately folded his hands in front of his crotch again as he straightened up, despite how his hands weren’t big enough to cover all of his hard cock and balls. He kept his head ducked, unable to look up and see the expressions of his peers. Hiding behind his hair hanging in front of his face was the most hiding he could manage to do.

“Come here.” Izuku beckoned him with a hand from where he was still leaning casually back against the desk.

Katsuki walked forward, sure he was flushed from head to toe as he was forced to display himself to so many of his gawking peers. His cock was incredibly hard, and keeping his hands in front of it was not doing much at all to preserve his modesty. Especially because his cock swayed and bobbed. He was tempted to press his cock down, to stop it from moving, but he was worried to give himself the stimulation when he already felt so close to coming.

“Don’t be shy!” Izuku reached out and guided Katsuki closer. Once he was close enough, Izuku’s hands grabbed his waist. He used the grip to pull Katsuki to stand right in front of him, facing outwards towards the class. “This is an educational environment!”

Katsuki’s heart dropped as he faced the rows and rows of people all staring at him. He practically went into shock, at the scrutiny. Not even mentioning how he was standing directly in front of his hot professor, butt-naked, and said professor’s hands were on his body. His cock throbbed so hard that he had to clench his teeth to resist touching it. He was sure it was leaking onto the floor. He was sure everyone noticed.

“A bit wider…”

Katsuki was only able to comply as he felt Izuku’s shoes pressing on the inside of his feet, pushing gently as he encouraged him to widen his stance a bit. Dropping his gaze to the floor allowed him to not have to see all the eyes on him, but it didn’t mean he forgot they were there. It also meant he became more aware of his professor’s hands on him, as well as his quiet, encouraging voice as he helped Katsuki get into position.

“Perfect, that’s it.” Izuku’s hands smoothed up and down his waist gently as he spoke, and Katsuki clenched his jaw because it made goosebumps rise on his sensitive skin. He shuddered slightly, then had to fight the urge to defend himself for doing so. He was distracted from that train of thought when Izuku hands smoothed down around to his lower back, then down over his ass.

What the— Katsuki’s eyes widened, clenching his jaw harder as he stared at the ground in horrified confusion. What is he doing? What is this?

“Relax, Katsuki.” Izuku’s large hands were massaging gently over his ass, and Katsuki squirmed, unable to help how his ass clenched. “Stay still and relax, or I’ll need to take a different volunteer.”

Katsuki shook his head jerkily right away, even though he would give anything to not be the one everyone was staring at, like hell would he just retreat now. He realized that Izuku’s hands massaging his ass and then smoothing up to his hips and sliding up his waist and back were meant to be soothing. Clearly, the professor thought the massage-like ministrations would encourage him to relax.

It was not helping him relax.

“And… let’s have your arms…” Izuku’s hands smoothed up to the back of his shoulders. Katsuki fully panicked as he felt Izuku stand up behind him, likely so he could better reach around Katsuki as his hands slid firmly down Katsuki’s arms, trying to pull them apart. “…at your sides.”

“Wait—” Katsuki squeaked out, resisting the movement for a moment, wanting to cling to his last bit of modesty. But Izuku’s hands were insistent enough that he didn’t fight him, letting his professor pull his hands away from in front of his crotch and back until they hung at his sides.

“Shhh, it’s okay, you’re doing great,” Izuku murmured so quietly that only he could hear as he now slid his hands up and down Katsuki’s arms slowly and gently. “Don’t worry, now all you have to do is stand here.”

Katsuki didn’t want to raise his head to see his peers, but that meant he was looking down. His embarrassed flush had spread far past his face and neck, down his chest. His entire, dripping hard cock was currently on display. He was so aroused that it stood pointed out from his body, and he watched in horror as the precum leaked from the tip of his cock… and dripped down onto the linoleum floors.

He was breathing hard through his nose, fighting to calm down and get himself under control. He heard Izuku start speaking, louder now as he addressed the class. He couldn’t comprehend a single word the professor said, because Izuku’s hands were still on him, and all he could hear was the rumble of Izuku’s voice and the sound of his own pulse in his ears.

Izuku’s hands were on his shoulders, moving up to his neck. It was all Katsuki could do to not shiver again as Izuku’s hands started to touch him all over, pressing here and there and moving his arms and shoulders as he went. All the while, Izuku was lecturing to the class. Distantly, Katsuki registered he was pointing out the different muscles—showing both their location as well as describing their movement.

Katsuki stared down at the floor. Despite Izuku’s encouragement and attempts at reassurance, the feeling of utter humiliation hadn’t gone away. He felt like he could feel the hundreds of eyes looking over every inch of his body, scrutinizing him as he stood there. Every time his cock twitched or spurted out a noticeable amount of precum, he clenched his teeth, hiding his flaming face behind his hair, wishing he couldn’t hear the whispers and snickers. He ducked his head down to the side, averting his eyes to a random spot on the floor, so he at least wasn’t staring so directly at his own naked body.

By the time Izuku had worked his way down and was lecturing about his lower abdomen and hips, Katsuki was so turned on that he nearly felt like tears were going to well in his eyes. His cock was throbbing so hard that it kept noticeably moving and twitching, his balls were tight, and he’d never wanted any sort of anything to be put in his ass quite like he did right now.

For some reason, Izuku kept occasionally massaging or caressing over parts of his body—mainly his back and his ass—that were out of view of the other students. Katsuki was still sure that the professor seemed to think it would help him to relax, but it was doing quite the opposite. Since Izuku seemed to be trying to be subtle in his encouragements—maybe as to not embarrass Katsuki in front of the other students by implying he needed to be comforted—he kept coming back to massage his ass and lower back. But every time his large hand was on Katsuki’s ass, shifting it around, Katsuki’s hole clenched and relaxed. By now, he was so turned on that each time it happened, he grimaced as if in pain, stomach clenching as he had to tight to stay still.

Not to mention that Katsuki’s skin was incredibly hot by now, hypersensitive and in need of relief because of his arousal. So every movement of Izuku’s hands on his skin was stimulating—but it turned him on and soothed the heat so equally that it just left him trembling.

It was agony. Mortifying, prolonged agony. All Katsuki could do was wait for it to end, determined to be the perfect student volunteer for this demonstration. Like hell would he be anything less than perfect or let some random person come up here and handle things better than he was.

Without warning, Izuku’s hand took hold of the shaft of his cock.

“H-aah,” Katsuki choked out an embarrassingly loud noise, completely out of his control, his hips thrusting forward into Izuku’s hand for a moment before he managed to catch himself. His torso bowed forward as he curled in towards the stimulation, his hand grabbing hold of Izuku’s muscular forearm to steady himself.

Then he slapped a hand over his mouth, his eyes widening in horror as he realized what he’d just done. He heard how his classmates were fully laughing at his reaction, and he wanted to die.

Straightening up and trying to pretend that hadn’t just happened, Katsuki was unable to look his professor in the eyes as he gritted out, “S-sorry.”

“Nothing at all to be sorry about,” Izuku replied gently. The laughter from the class cut off, and Katsuki could only hear Izuku’s voice. “You’re doing perfectly, Katsuki.”

Katsuki’s body trembled as Izuku’s hand started to move on his cock.

“Just relax,” Izuku murmured as he stroked slow, gentle strokes up and down Katsuki’s cock. His grip was very loose and normally would do nothing for Katsuki. But after being turned on for so long with no stimulation, it felt like the best thing Katsuki had ever felt.

“Can’t—when you’re—” Katsuki grunted out, trying to keep his voice low.

“This is what you were wanting, right?” Izuku asked, voice quiet and next to his ear. “It feels good?”

“Ngh… professor, I—ah!” Katsuki tried to think clearly as Izuku brushed over the head of his cock, teasing the slit gently with the pad of his thumb for a moment, then sliding back down. “I don’t want to—fuck—disrupt—hah…”

“You’re not disrupting,” Izuku murmured as he continued to stroke over Katsuki’s cock in those slow movements. At the same time, his other hand was caressing other parts of Katsuki’s body.

Katsuki realized with some degree of frustration and confusion, that Izuku was now stroking his cock in the same way he had been touching his whole body. As if to calm him and soothe him, somehow completely ignorant of the fact that it was riling him up so much. The slow movements that were meant to urge him to relax were only making it harder to think and contributing to his agony.

“We learn about the body in this class,” Izuku said. “Your body’s reaction to all this is natural, so you’re not doing anything wrong. Okay?”

Katsuki was going to lose his fucking mind. Unable to help it, his hips jerked forward, then he couldn’t stop how they thrust forward and back in Izuku’s fist, determined to speed things up a bit if nothing else. He panted heavily as he looked down at it, unable to help himself. He had to stifle a moan at the sight of Izuku’s massive hand fisting his cock, it was so big it made his cock look tiny. For a moment, he wondered if he could just fuck Izuku’s hand like this until he came, it would be embarrassing but at least he wouldn’t be hard anymore—

Izuku’s hand let go of his cock, instead reaching for Katsuki’s waist. Katsuki stifled an automatic frustrated noise in his throat, head swimming as Izuku’s hands wrapped around his waist again. Still looking down, his angry red cock was left alone as Izuku’s massive hands clamped around either side of his waist. As strong and built as Katsuki was, he’d always had a smaller waist, and he shook from the intensity of his arousal of seeing his professor’s hands there.

“Good, now that you’re nice and relaxed—” Izuku muttered in his ear, his hands squeezing Katsuki’s waist once gently. “—are you ready to move forward with the lecture, Katsuki?”

I’m not fucking relaxed! Katsuki heaved for breath, swaying on his feet. He couldn’t believe his ears.

“Alright, continuing with the pelvic region…” Izuku’s voice got louder again as he addressed the class. “We will go into reproductive function in a few minutes, but for now, we’ll take a look at the various parts.”

Izuku’s hand approached Katsuki’s cock again, and he said quietly, “Are you ready?”

For what?! Katsuki wanted to scream, but he fought for composure. He took deep breaths, clenching his hands into fists. He just nodded.

Not to mention, it was so embarrassing that his professor had to check in with him so often. The entire class was watching, dammit. He needed to get his shit together right now. Obviously he could do this, obviously—

His abs and ass clenched as Izuku’s hand was on his cock again. He was determined to stay still, determined to do his part and not embarrass himself further.

“As hopefully all of you know, this is the penis,” Izuku joked, and the class laughed. Katsuki’s eyes actually teared up from humiliation, and he had to take a moment to squeeze his eyes shut. He wished he could do anything to feel grounded or at least less exposed. “This one is average-sized in length and girth, so it’s a great example to show you all today.”

Katsuki was certain he’d never felt so mortified in his entire life. He could only turn his head to the side, trying to breathe through his clenched teeth, trying not to fuck into Izuku’s hand. He supposed being called average-sized wasn’t the worst thing, and he knew his professor said it to be informative, not to emasculate him, but that didn’t make him feel any less embarrassed.

“This is glans of the penis, also referred to as the head or the tip—” Izuku’s fingers gripped the tip of Katsuki’s cock, then he gently rolled in between his fingers, massaging over the slit and then down until he stimulated directly underneath.

“Nghh—” The moan was torn from Katsuki’s throat from the stimulation on such a vulnerable and sensitive area. He grimaced as if in pain, his hand against grabbing hold of Izuku’s forearm right above his wrist again. “I can’t—”

“Shh, it’s okay,” Izuku murmured, loosening his grip on Katsuki’s tip, gently smoothing down his cock in that same motion that he seemed to think would sooth Katsuki for some reason.

“Please…” Katsuki begged through his teeth, though he didn’t know what he was begging for.

“You’re doing great. You can keep holding my arm if it helps.”

Katsuki took him up on that, bracing himself against Izuku as the lecture resumed. His mind was swimming and sweat dripped down the side of his face. He was so warm, and his skin practically felt feverish by now.

Izuku meticulously palpated and pointed out every aspect of his cock to the class, then held it up to show his balls. He even rolled those gently in his hands, once again acting as if the action would be soothing or placating to Katsuki rather than mind-numbingly arousing.

Did Izuku just have no idea what he was doing to him?! How could he?!

Katsuki accidentally glanced up for the first time in a while, and the sight did not help things at all. Everyone in the class was paying close attention, some taking pauses to take notes. They were looking at his crotch, obviously, as that was where Izuku was instructing them to look.

Katsuki nearly cringed in horror. Not only did his professor seem unaffected and unphased by anything going on, but the class seemed to be doing so too. He was sure he heard snickering, sure he could feel the judgment, but no one was looking at him like that. Instead, the expression ranged from mildly bored to focused to fascinated—as if he really were just another specimen to be studied.

Is this… really normal? Katsuki felt the urge to shrink away. Am I the only one who’s being weird about this?

“I—” Katsuki felt off balance, swaying on his feet.

“You’re right. Of course,” Izuku said, suddenly addressing him. “Sorry I didn’t think of it sooner, Katsuki. I have had you standing up here for a while. Of course you can lean back.”

“Wha—?” Katsuki could only go with the movement as Izuku pulled him back into him, his backside pressing into Izuku’s. “I didn’t say—”

“Lean back… that’s it,” Izuku said.

Katsuki stiffened when he settled down on his professor’s lap, a sudden, intense rush of clarify and something feeling wrong making him jerk forward. Wait, he shouldn’t be sitting on his professor’s lap, right?! Wasn’t there some reason he wasn’t supposed to do this?!

“Wait, are you sure,” he said. “I don’t—”

“Yes, remember the number one priority when it comes to both lecture and labs, Katsuki?” Izuku’s hands were firmer now as he pulled Katsuki back against him by the hips. “Safety first. This might cause a bit of lightheadedness or make you unsteady on your feet, so this is the best way to do it.”

Yes, I’ve jacked off before, Katsuki barely managed to keep from snapping. He didn’t want to ruin things with his professor now, no matter how embarrassed and self-conscious all this scrutiny was making him.

“Is this better?” Izuku asked as he moved his—incredibly thick and muscular—thigh between Katsuki’s leg. Katsuki was now straddling his thigh, leaned back on his leg.

Katsuki’s cock throbbed and spurted out more precum onto the floor, and he ducked his head to look at it in horror. A sound escaped from his mouth before he could help it, a breathy sound that was approaching a whine.

“Shh… I’m almost done.” Izuku spoke quieter to him, and he reached down and started to stroke over Katsuki’s cock again. But rather than continue to address him or soothe him, he again raised his voice to continue lecturing the class. But he didn’t stop moving as he continued to jerk him off, almost distractedly and carelessly as he focused on the lecture. “So this is a perfect example of an erect penis, resulting from a state of arousal…”

Katsuki shuddered and shook, nearly brought to tears again as his professor held him in place on his lap, jerking him off a bit faster but still lazily. He wasn’t even paying attention to it, fully focused on his lecture.

Honestly, Katsuki had no idea how he hadn’t come yet. He’d been hard this entire time, and he’d felt ready to blow for a while now. Yet his arousal only grew, taking over his body and thoughts until the pleasure grew so intense it was very nearly painful. He couldn’t think any more. Even if this was all normal, he couldn’t seem to get rid of the eyes on him. But despite the eyes on him, he felt ignored… almost objectified.

Distantly, he heard as Izuku described the inner workings of the male reproductive system, how the penis worked… all while stroking Katsuki’s cock. As if to keep him entertained and in place as he did so.

Since Izuku seemed content to ignore him for the moment, Katsuki started to gently rock his hips back against Izuku’s leg and then forward into Izuku’s hand. His breath hitched as his ass rolled back against the hard muscle of Izuku’s leg and shuddered out as he rolled it forward into Izuku’s hand.

Katsuki leaned back more against Izuku’s chest, letting himself get into it more since it was clearly part of the class. His head fell back against Izuku’s shoulder, his eyes closing as he thrust into Izuku’s hand.

“Hah… fuck…” Sounds started to slip from his mouth.

Izuku’s other hand came up over his mouth. “Quiet. Another student is speaking. It’ll be your turn in a moment.”

Katsuki’s hips stuttered in confusion. He wasn’t trying to talk. His dazed eyes fluttered open, he listened and realized Izuku was taking questions from the class, answering them.

All while still stimulating Katsuki’s cock. Except now his other hand was being held over Katsuki’s mouth, muffling the noises that Katsuki was struggling to keep quiet.

Why… why can’t I come? Katsuki whined in his throat, muffled by Izuku’s big hand. I need to come…

He felt like he’d been on the edge for so long. His eyes flew open when Izuku’s hand stopped moving.

“Mmph—” Katsuki tried to protest but his mouth was obviously still covered.

“You’ve been a big help, Katsuki,” Izuku said in his ear, sounding proud. He seemed to not have noticed that Katsuki had tried to speak, because he just went on talking, “I think you’re the best demonstration assistant I’ve ever had.”

You got that right, Katsuki thought, relieved that, if nothing else, Izuku now saw he was the best.

“Think you can help me out with one last demonstration?” Izuku asked quietly and gently. “You don’t have to, of course, but honestly—” He chuckled, speaking so lowly only Katsuki could hear. “—you’re top of the class, I know that no one else could do it as well as you.”

Obviously not. Katsuki agreed. He nodded his head, forgetting entirely to ask what the demonstration was.

“Alright, this is the last demonstration we’ll have time for today,” Izuku said loudly, addressing the class. “Our wonderful student volunteer is going to show us what the ejaculation process looks like!”

Katsuki nearly moaned out loud. He was beyond caring that everyone was watching. All he cared about was that he was going to be coming.

Izuku’s hand left his mouth, adjusting them so that Katsuki was standing up more. Katsuki’s knees shook, but Izuku braced him against him, holding him up.

“Catch your breath… find your balance… that’s it…” Izuku muttered in his ear. “To demonstrate, I need you to thrust into my hand, can you do that?”

Katsuki nodded jerkily, all thoughts gone from his head. He immediately started to clumsily thrust his hips forward into Izuku’s fist. He was shaking and unsteady and clumsy, breathing hard through clenched teeth. Izuku steadied him with a hand on his side.

“It’s okay to make noise now,” Izuku told him gently. “We’ll all be quiet so we can observe the process.”

Katsuki’s hips stuttered, ducking his head further to try and shut out the reminder that everyone was staring at him, even though the heat on his face that was spread all the way down to his red and leaking cock didn’t let him forget it. He felt so mortified, and he was determined to at least show everyone he could do this right. Surely, that would make him feel less embarrassed.

“Hah… ngh… ah…” Katsuki was unable to stop the noises slipping from his throat as he approached the edge finally. He was so aware of the complete silence in the room, other than his grunts and moans, and the sounds of his cock slicking back and forth in Izuku’s fist.

Izuku’s hand was unmoving as he held it out for Katsuki to fuck into. With his other, he began to assist by guiding the movement of Katsuki’s pelvis with the hand on his waist.

As Izuku guided his hips, Katsuki also grinded his ass back against Izuku’s crotch. Katsuki’s rhythm faltered when a particularly hard thrust back resulted in Izuku’s hard cock grinding against his ass.

“F-fuck…” Katsuki’s eyes flew open for a moment, though they fluttered shut again almost immediately. Izuku was huge. And he was hard?! Maybe that should’ve been weird, but he couldn’t remember why. Instead, it just made him moan and roll his hips forward and back even more.

“You’re doing amazing,” Izuku muttered quietly. “Take your time.”

Katsuki grimaced, gasping out, “T-tighter, please… please.”

Izuku’s grip tightened, and Katsuki moaned loudly, picking up his pace.

“C-can I…?” Katsuki choked out as his balls tightened, drawing up as he reached the edge. “I’m about to—I’m—”

“Go ahead,” Izuku said. “Show everyone what you can do, Katsuki.”

Katsuki hips jerked forward and he threw his head back as pleasure rolled through him so intensely that he cried out. His mind whited out for a long moment, only able to feel pleasure as Izuku stroked him through it and his cock finally released, pulsing as he came. He distantly realized he was whimpering and gasping as if he were in pain, and that Izuku was holding him up. His thrusts slowed as he came down from it, gasping, feeling as Izuku continued stroking his length, as if trying to milk the last of the cum from his cock.

Katsuki didn’t even feel fully present anymore. He was out of it as Izuku gently guided him around the desk, sitting him down in the professor’s chair and murmuring for him to take a second. He didn’t register anything Izuku said as he seemed to conclude the class. Everyone stood up, the loud ruckus and chatter announcing as all the students got out of their seats.

The sound made Katsuki stir in confusion. He was sprawled, naked, at the front of the classroom. Horror filled him anew as he scrambled clumsily to cover himself, his limbs sluggish and heavy. He spotted his clothes on the floor, and he lunged for them, grabbing them up and hurrying to get them back on. His cheeks heated up again as his peers giggled or simply stared at him as they passed by to exit, most of them undeterred by his attempts to glare at them.

Izuku’s laugh drew his attention as he finished pulling his shirt over his head. There was a line formed by students to speak to the professor, and Izuku was laughing at what one of them had said.

Mind still dazed, Katsuki’s gaze dropped to Izuku’s midsection. With how the professor was facing, he couldn’t see his crotch well but…

The memory of Izuku’s hard cock against his ass was burned in Katsuki’s mind.

As horribly embarrassing as this whole thing had been, coming had felt so good. And Izuku’s cock…

Katsuki wondered if there would be other demonstrations in this class. He wanted to ask about them.

He knew suggesting his professor fuck him in the ass in front of the class wasn’t exactly a great way of showing how reproduction worked. When was the lecture on female anatomy? Not that Katsuki was a girl, but he was certain he could take Izuku’s cock than anyone in here regardless of gender. If it was him, they could show off the general movement, and the professor could point out any necessary differences for the class in the lecture anyways.

Plus, they probably didn’t want any accidental pregnancies, right? Katsuki was a perfect demonstration assistant for that. No risk of pregnancy here.

His wonderings were cut off by Izuku approaching. He looked around, realizing that Izuku had already answered every question, and the last of the students were finally filing out of the room.

“Thanks again for your help today, Katsuki,” Izuku said with a friendly smile. He started to gather the materials on the desk, clearly beginning to pack his things away. “It can be so difficult to get students to participate in class, so you have no idea how grateful I am that you were so willing to do so!”

“Yeah, whatever.” Katsuki looked off to the side as his cheeks heated.

“I’ll give you some extra credit for that, for sure!” Izuku shot him a smile.

The smile made Katsuki’s stomach erupt in butterflies.

“Your dick was hard,” Katsuki blurted out.

Izuku’s head jerked up, his expression a look of shock and warning on his face. “Excuse me?”

Katsuki’s cheeks heated yet again. “Just… during the demonstration. I felt you.”

“Oh.” Izuku deflated, laughing as if there’d been a huge misunderstanding. “Right. Well, as I told you, that can happen! Nothing to be embarrassed about, is it? It happens to everyone!”

“I can… I can take care of it,” Katsuki offered before he could lose his nerve, his mouth watering as he looked down towards Izuku’s crotch and back up. With Izuku’s dark slacks and the desk between them, he still couldn’t really see, but he remembered how it felt. “If you want.”

Izuku stared at him with a serious look for a long moment. Then he sighed, as if tired or disappointed.

“Katsuki, you’re a smart kid,” he said. “Surely you understand how inappropriate that is?”

Katsuki’s lips parted slowly, blinking as he tried to comprehend what he was being told. “What…?”

“I am flattered,” Izuku said politely. “But any interactions other than professional between students and teachers is against school policy.”

“But…” Katsuki stammered, lost for words. He glanced behind himself… at the empty lecture hall… at where his own cum was still splattered across the floor.

But didn’t you just jerk me off in front of hundreds of students?

“Your feelings are completely understandable and natural,” Izuku said gently, “and I appreciate you telling me that you were feeling this way, but please keep in mind school policy. I’m not the sort of professor who is willing to cross those boundaries.”

Katsuki blinked slowly at him. For a very brief moment, the words sounded absurd. So absurd that he didn’t know how to comprehend them.

Then they clicked into place… though his vision was getting a bit blurry for some reason.

Katsuki was crossing boundaries, wasn’t he? Oh god, what was he doing? What had he just said to his professor? That was so inappropriate! That wasn’t like him at all! What if his professor thought he was offering to do that for extra credit? As if Katsuki needed to do sexual favors to get perfect grades!

“Fuck, wait…” Katsuki took a few hurried steps backwards, nearly slipping on his own cum.

“Oops!” Izuku laughed good-naturedly. “Careful there! I’ll call custodial, make sure they know we need cleanup after our demonstration!”

Katsuki was shaking his head, confused and disoriented. His head felt weird. He reached a hand up to his head, stumbling back again despite how he wasn’t slipping on anything this time. He didn’t fall as warm hands caught him by the waist, steadying him.

“Careful… easy now, Kacchan…” Izuku’s hands were wrapped around him, guiding him to sit down onto a chair. “Time to wake up, is it?”

Kacchan…? Katsuki was unable to ask because Izuku’s lips were suddenly on his own, capturing him in a brief but deep kiss.

“What…?” Katsuki’s body went limp as the world swam before his eyes.

“I’ll see you soon…” Izuku’s voice was the last thing he heard.

Katsuki’s eyes flew open as he jerked awake.