Work Text:
The second Katsuki took a step onto the train, he knew he’d chosen the wrong car. The overwhelming stench of pheromones pumping through the recirculated air was enough to make him gag.
A male omega straddled an alpha’s lap on one of the long, blue seats. The alpha was fully clothed, but the omega’s work clothes were discarded onto the dirty train floor. The omega held onto the metal pole next to him for support, sighing as his partner sucked the angry red claim mark on the nape of his neck.
Katsuki rolled his eyes. Mated pairs were the worst.
He wouldn’t have given them a second thought, but then something about the omega caught his eye: alpha fangs. He sniffed the air again and frowned. It wasn’t a normal alpha/omega pair after all. They were both alphas.
The submissive alpha met Katsuki’s cold gaze and shivered, blushing as his erect cock was put on display for all to see, a knot forming at its base.
“The fuck are you looking at?” Katsuki growled at him, baring his fangs. It was shameful for an alpha to submit like that, especially in public. What the hell were they thinking?
The submissive alpha smelled Katsuki’s agitation but didn’t cower. Instead, he just increased the pace of his hips, moaning softly as his mate fucked him deep.
Katsuki scowled in distaste and shuffled into an opposite corner, pulling out his phone to look anywhere but at the unsightly scene. He sighed when he saw that there were no new messages. Where the hell was his shitty boyfriend? He did not want to have to suffer through the commute to UA University alone with those two perverts stinking up the place.
Just as he was considering moving to another car, Izuku sprinted through the closing doors.
“Took you long enough!” Katsuki barked.
Izuku panted for breath, but he flashed Katsuki a bright, apologetic smile anyway. “Morning, Kacchan!”
A sob of pleasure interrupted them. Izuku’s eyes immediately shot over to the couple having sex.
“ Alpha ,” the naked one groaned, bouncing desperately on his mate’s dick. “Please… more!”
“I… uh… sorry I’m late… uh…” Izuku stammered, struggling to talk over the sound of skin slapping against skin. His eyes immediately began to dilate, and he unconsciously bared his sharp alpha fangs.
Katsuki sneered. He knew that look too well. That nerd was enjoying the show way too much.
“Knot me!” the alpha begged, making eye contact with Izuku and moving a hand down to stroke himself. “Knot me in front of all of these people. Show them how much you love me.”
“Our stop is up next,” his mate grunted underneath him. “We shouldn’t… get stuck together… ugh… we’ll be late for work.”
“ Please ,” the other one insisted. “Fill me with your cum. Breed me like an omega. I can take it. Please .”
His mate growled deep and low like an animal, too far gone to form words anymore. Their bodies locked together, and the submissive one finally cried out, stretched full with his alpha’s knot. His knees shook against the cloth seat, barely able to support himself any longer as cum shot from his dick onto the train floor.
A woman took a step back. The cum had just barely missed her. Some of the surrounding passengers laughed and clapped. Others turned away in disgust.
“Fucking nasty,” Katsuki spat.
Izuku wasn’t listening. Public displays of affection were common and legal, but he’d never seen a mated pair of alphas before. He muttered to himself quietly, unable to tear his eyes away from the exhausted couple.
“What the hell are you going on about now , you little freak?” Katsuki grumbled. He didn’t like the strange, wistful look on Izuku’s face.
Izuku gulped and glanced at Katsuki longingly. “Do you ever wish that other people knew about us, even though we’re both alphas?” he asked quietly.
Katsuki crossed his arms. “The hell would I care about what some extras think?”
Izuku grabbed his lower lip and scrunched his face together thoughtfully. They’d known each other since they were in diapers, and they’d been dating for almost a year. Surely, some of their friends had already noticed the change in their relationship. Maybe it wouldn’t be so shocking after all.
Katsuki looked over at the alpha couple, still locked together and holding each other lovingly. No one was staring at them anymore. The train seemed almost normal.
He sighed. “I am getting sick of wearing these damn scent blockers all the time.”
Izuku perked up, looking at Katsuki with disbelief. “Really? Does that mean you want to tell people too? You’d really want to? I know it’s kinda awkward, but I don’t really think any of our friends will judge you for-”
“Shut up!” Katsuki yelled, bringing a hand up to massage his temple. “Just… whatever. Get it over with already. Do whatever you want.”
Any doubts that Katsuki had were wiped away by the brilliant grin on Izuku’s face.
“I love you, Kacchan,” the green-haired alpha said earnestly.
Katsuki scoffed, a small noise of reluctant affection. “Sure, yeah. What else is new?”
Izuku pulled him into a kiss, and Katsuki finally relaxed, completely unaware of what he’d just gotten himself into.
~~
Katsuki flipped on the light switch, revealing an empty classroom.
“Wow, no one else is here yet,” Izuku remarked, almost startled.
It wasn’t unusual for Professor Aizawa to be late, but at the very least, Tenya normally made it to the classroom before them.
They both set down their bags at their seats, and Katsuki slumped into his chair.
Izuku remained standing. He glanced toward the clock.
“Hey, Kacchan…” he began slowly. His heart pounded in his chest as a wild idea formed in his head. “Since no one’s here… do you wanna… fool around?”
Katsuki’s head shot up, brow furrowed with disgust. “You idiot. Class is in fifteen minutes,” he hissed.
Izuku smiled lopsidedly. “Isn’t that part of the thrill? Besides, I thought we weren’t gonna hide anymore.”
Katsuki narrowed his eyes, and Izuku knew that he was pushing his luck. When Katsuki didn’t answer, Izuku shook his head. “Never mind. You don’t want to. Just forget-”
Katsuki growled and shot back out of his seat, grabbing the front of Izuku’s shirt and pulling him in for a fierce kiss. Izuku relaxed in his arms, lips moving ferociously with pent-up desire.
It wasn’t until Katsuki felt Izuku run his hands under his shirt that he realized exactly how far Izuku was willing to go. “Did those fucking exhibitionists turn you on that much?” he scoffed.
Izuku nodded quickly, his rapidly inflating erection rubbing against Katsuki’s leg. He had the nerve to look shameful even as he was doing something so depraved, humping against Katsuki like a misbehaving dog.
“It’s not too late, Kacchan. Tell me to stop and I will,” he panted. “Or I could just… keep going and let everyone see how hot you look underneath me.”
Katsuki glanced toward the door. Despite his earlier disgust at the idea of public sex, it was different with Izuku. He couldn’t resist the heat radiating from the heavy pressure against his leg. “Do your worst, nerd. I dare you.”
In the blink of an eye, Izuku yanked Katsuki’s shirt over his head. Katsuki’s hands worked just as eagerly, unbuckling Izuku’s pants and palming his hardening co ck.
Izuku’s breathing grew more ragged as Katsuki stroked him over the confines of his All Might: The Animated Series boxer shorts. He resisted leaning into Katsuki’s teasing hands. He didn’t want to cum yet, not until they had an audience.
He forced Katsuki back until he was lying across their shared seminar table. Katsuki smirked, enjoying being manhandled. He lifted his legs to allow Izuku to shimmy off his pants and underwear.
As soon as Katsuki was naked, Izuku leaned down and began sucking on Katsuki’s chest, groping every inch of skin he could find.
Katsuki’s hair stood on end with the anticipation of getting caught, but he leaned back and tried to relax anyway. He grunted in approval as he was fondled, and slowly, he felt his mind go blank.
The sound of heavy breathing and the wet suction of Izuku's mouth on him were all that echoed in the empty classroom, until finally, the door swung open.
“Thanks for helping with the-” Tenya abruptly halted in his tracks.
Izuku looked up, mouth still full, to see the flushed faces of Ochako and Tenya. They both stood completely still in the classroom doorway, unable to process what they were witnessing.
“D-Deku! And… Bakugou?!” Ochako exclaimed, scandalized. She flushed and quickly covered her eyes, but there was no escape from the smell of pheromones in the air.
Tenya sighed and pushed up his glasses. “Make sure not to get the classroom dirty, you two!” he rebuked sternly. He continued to his seat and pulled out his supplies, preparing for the class and not sparing them another thought.
Ochako looked between Tenya and the two alphas in disbelief, but she didn’t say any more. She sat down as well and pulled out a textbook, hiding her mortified face behind it.
Izuku tugged at Katsuki’s nipples harshly, causing Katsuki to groan.
“Get on with it,” the blonde demanded.
“Not yet,” Izuku murmured, kissing a trail down Katsuki’s chest.
Katsuki scowled. He was growing impatient.
Just as he was about to shout profane complaints, a large group of their peers piled into the classroom together.
Hanta did a double take, unable to believe his eyes. “Holy shit. Bakugou, is that you ?”
“It is !” Eijirou answered, eyes wide.
“Hey, guys!” Izuku waved at them cheerfully. He fished a bottle of artificial slick out of his pants pocket on the floor and squirted some onto his fingers.
Denki’s eyebrows shot up when he saw Izuku carefully slide a finger into Katsuki’s hole. He whistled, impressed. “Wow, Bakugou. You- aren’t you an alpha?”
“Shut the fuck up, beta !” Katsuki barked, fangs bared.
No one argued. They all scrambled for their seats, heads bowed in submission. The classroom was silent. At least, it was until Minoru opened his big mouth.
“Look at him, though,” the short man said, leering at Katsuki as Izuku slowly worked him open with one hand and teased one of his pecs with the other. “Can you believe Bakugou likes getting his titties played with? He’s like an omega bitch!”
Eijirou glanced at Katsuki, embarrassed. “Don’t be weird, guys. I think what they’re doing is super manly and brave. They’ve probably been dating in secret for-”
“Stop fucking talking about me like I’m not here,” Katsuki hissed. Before he could berate them any further, Izuku pulled him up and spun him around. He found himself bent over the table, presenting his ass in the air.
The new position pointed him directly toward the door. He looked up and happened to lock eyes with Shouto just as he walked into the room.
Shouto strolled over to his usual seat next to them, face as expressionless as ever.
“Morning, Todoroki,” Izuku said. He casually got down on his knees and spread the thick globes of Katsuki’s ass cheeks. Slowly, he licked the rim of his boyfriend’s entrance.
Katsuki grunted in surprise.
“Morning, Midoriya,” Shouto replied, unphased. “Glad you two seem to be getting along this morning.”
“Shut your trap, half-n-half!” Katsuki moaned, humiliated that he was starting to lose his composure when the man sitting next to him didn’t seem to be affected by their little show in the least.
Izuku moved his tongue rhythmically, shoving the wet appendage inside as far as it could go.
Katsuki curled his fingers around the table, grasping the edges and pressing his face against the cool surface. His mate wasn’t playing fair, knowing that being eaten out was one of Katsuki’s (very few) weaknesses.
Hanta chuckled. “ That seemed to shut him up.”
Katsuki was getting irritated by all the comments, mostly because they turned him on more than they annoyed him.
Artificial slick and saliva squelched loudly as Izuku’s tongue fucked into him with fervor. Katsuki pushed his hips back desperately. Soft moans escaped from his throat before he even recognized them as his own.
More and more of their classmates walked into the room until, eventually, all the seats were full, but Katsuki was too far gone to pay attention anymore.
“Bitch that alpha!” Minoru cheered. “Make him scream!”
Though most of their classmates were more polite, it seemed as if the entire classroom was watching with bated breath.
“Is that what you want, Kacchan?” Izuku asked, his eyes fixed on his boyfriend.
“Yes, fucking fine. Do it already,” Katsuki demanded with an annoyed huff. He turned around again and braced himself against the table.
Izuku finally unzipped his pants and took out his cock. “Then tell them , not me. Tell them what you want me to do to you, and I’ll put it in.”
Katsuki narrowed his eyes. Their morning commute had definitely unlocked some kind of weird exhibition kink in Izuku. Admittedly, though, Katsuki was kind of into it too.
“They’re waiting, Kacchan,” Izuku murmured in Katsuki’s ear, rubbing his cock against the cleft of Katsuki’s ass. One small push of his hips was all it would take.
“Yeah, we’re waiting, ‘ Kacchan !’” Denki yelled.
“Tell us! Tell us!” Toru chanted.
Katsuki looked around wildly like a cornered animal. His cheeks burned with embarrassment. He mumbled out a response through gritted teeth.
“What was that?” Izuku asked. His freckled face looked deceptively innocent.
“I said ‘ fuck me !’” Katsuki barked back at him. “Just shove it in already!”
“Good boy.” Izuku grinned, staring at Katsuki with complete and total admiration. He couldn’t believe how lucky he was that his childhood friend let him mount him in front of almost everyone they knew.
Several people cheered, but Katsuki’s eyes immediately closed, too focused on the feeling of Izuku’s cock finally pushing gently inside.
At that exact moment, Professor Aizawa walked into the room. His gaze immediately fell upon the two alphas fornicating in the corner. He rolled his eyes, but made no comment, walking to the podium in front of the class as if it was any other day.
“Alright, who actually read the assignment last night?” he droned in his usual tired voice. “Tell the class what it was about.”
Momo cleared her throat and raised her hand, trying her best to maintain composure even as the atmosphere around her was saturated with the excited pheromones of all her classmates.
“The text was about the r-rights of omegas and how they have drastically changed since, um, the Meiji Period,” she explained.
Aizawa nodded. “Good. Now who can name one of the ways they have changed?”
A few more hands shot into the air, and just like that, class continued on.
Regardless, Katsuki wasn’t listening to a single word that was being said anymore. Everything was drowned out by the smacking of Izuku’s hips against his. He tried to keep quiet, suppressing his grunts of pleasure as best as he could, but it seemed like Izuku was purposefully trying to fuck the noises out of him.
Izuku curled his hands around Katsuki’s waist, gripping it tightly as he thrust into his boyfriend’s tight heat. He pulled Katsuki’s head back by his hair and sucked possessive hickies into the skin of Katsuki’s neck, clearly marking his territory.
It was a surreal experience for Katsuki. His whole body was overtaken with pleasure, and yet, the world continued around them as normal. He and Izuku were nothing but a nuisance, a couple of degenerates interrupting class.
He felt powerless. All he could do was stand there and take it. The worst part was that he actually liked it that way, and now, everyone knew.
Mina and Toru snickered to themselves, pointing at the knot forming on Katsuki’s cock, dangling uselessly in the air.
It was all beginning to be too much. Even Izuku began to mumble incoherently, and Katsuki knew that was a clear sign that he was getting close.
“You’re doing so well for me, Kacchan,” Izuku sobbed, driving his hips in harder. He reached around and stroked Katsuki’s dick. “Fuck, can’t believe you’re so perfect, so amazing. Love you so much.”
“C’est romantique!” Yuga sighed wistfully to Koji.
Koji blushed and nodded, covering himself to hide his obvious arousal.
Katsuki struggled to hold himself up any longer. His legs shook as the swell of Izuku’s cock brushed against his prostate, sending shockwaves through his entire body.
“Gonna cum, Kacchan?” Izuku asked softly. His hips snapped back and forth at a feral pace, like they were nothing but animals copulating in the wild.
“Hell yeah he is!” Minoru cheered loudly over the Professor’s lecture, blood-shot eyes staring intently at the sex he wished he could get one day.
At the outburst, several more heads turned toward them curiously. Tsuyu looked genuinely happy for the couple. Mashirao looked away.
Katsuki nodded quickly. “Oh, fuck. Deku!” He held on for dear life, groaning for release as Izuku’s knot began to catch on his rim.
His eyes fluttered open, and he saw that everyone in the classroom was staring at him. Even Professor Aizawa fixed him with a glare of disapproval.
There was no denying or hiding it any longer. Everyone had seen it. He was about to cum on another alpha’s knot.
It was that thought that finally sent Katsuki over the edge. Izuku jerked his cock steadily, squeezing out every last drop.
“Kacchan,” Izuku gasped as his knot finally popped into place, locking him firmly inside. “You feel so good.”
Katsuki collapsed onto the table, but Izuku continued to shallowly thrust his hips, pumping him full.
“Check out Midoriya’s cum face,” Mina giggled, but the two alphas no longer cared about what any of the others had to say.
Preparing to be stuck together for a while longer, Katsuki groggily adjusted to a more comfortable position. He shivered as Izuku leaned down and kissed him on his neck, right where he knew a mating mark would be someday. He felt something stir inside him at the gentle gesture. They’d known each other their whole lives, and in that moment, he was sure they would be together for the rest of them.
He looked around the classroom and smirked, already feeling the urge to go again. It was a good thing that public sex was legal. He knew from then on they’d be a menace to society.