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When Midoriya Izuku first stepped into this odd world he was baffled and honestly a bit... disturbed. It was extremely similar to his home; the cities and countries were the same, the languages were the same, the technology was the same, and even the people were mostly the same. However, there was one key difference—secondary sexes.
In this world, not only did everyone have a primary sex consisting of female, male, or intersex, but they also were either an alpha, beta, or omega.
Alphas were aggressive, territorial, and tended to have bigger and more muscular statures. Betas were akin to the people back in his world but with slightly enhanced senses but less so than the other sexes. Lastly, omegas were smaller, softer, caregiving, and meant to birth children... or pups as they often called them here.
All the secondary sexes emitted pheromones, stronger ones that could be consciously perceived and scented in the air. Betas could perceive them but weren't affected by them, however, alphas and omegas seemed to go crazy for them, often giving into their baser instincts.
This new addition of these dynamics frightened and embarrassed Izuku. It made the world so much more... outwardly sexual, and put a lot of emphasis on 'breeding'. It was all much more carnal than he was used to.
However, after he got used to the changes he became enthralled by them. Secondary sexes were just so different than anything from his world! How the various sexes behaved and their reasonings were so fascinating, plus how those behaviours interacted with a society that was so similar to his was such an interesting case study!
Luckily, he could observe as an objective outside party since he belonged to none of the secondary sexes.
He wasn't exactly sure how he got here—he last remembered a bright light and a soul-shaking boom during a lightning storm before he woke up laying in the grass of a park he used to play in as a child.
It was an unwelcome shock to learn that everyone he knew was nowhere to be found and that he had no history in this world, but he figured there was no use dwelling on things he couldn't control and that he should start doing things he could. Though, if it took several existential crises before he could do anything productive, that was his business.
Eventually, he was able to start working at a small convenience store with a nice elderly owner who forgave his lack of home address and even let him have a bit of an advance to be able to afford a place to stay sooner. It took a few nights of bumming it out in the outdoors and he was only able to afford a small, dingy one-room apartment but he was eventually able to integrate himself into this new world even partially. None of his connections, experience, or credentials were valid here but he would manage. Somehow.
So far, about a month and a bit into his stay in this new world he had practically no social life. Due to his abrupt drop in, he had little to nothing and needed to work everyday to make up for it, meaning he didn't have time for much else unless he wanted to never rest. Besides, he probably seemed like a bit of an anomaly anyway, even if you compared him to a beta. Most of the time, he missed cues or didn't understand things people were trying to say. He was learning though, and much like many of his other fixations, he had started a notebook documenting his findings.
One night, during a shift he had on his own, an interesting customer walked in. He was obviously an alpha, but was somehow more imposing than most, incredibly tall, with sharp features, and a large stature with muscles that couldn't be concealed by his prim and proper business suit. His eyes were a piercing crimson and his hair was a spiky platinum blonde mess. He looked like the type that was usually intimidatingly composed with an imposing aura to match, but tonight he looked worn down.
A tinge of sympathy tickled Izuku. Perhaps he was a business man that had a deal fall through, or an office worker slaved by his boss.
No matter how intimidating the man was, Izuku resolved to be as kind as possible as to hopefully make his night a bit easier.
He smiled, "Welcome! Please take your time!"
The man grumbled, faintly acknowledging him before walking through the aisles.
Izuku tried not to stare in curiosity, instead tracing the divots in the counter as he'd done a hundred times before. There wasn't much to do when he didn't need to attend to customers or restock anything. Plus, he hadn't been able to afford a phone, much less a phone plan.
He jumped when a can of coffee and a bag of chips were dropped onto the counter within his field of vision. Eyes slowly moved up to the alpha from earlier, his angular face set in a scowl.
"A-Ah, yes, um, let me get that for you!" he starting ringing through the items, cringing at the extra spicy chips that made sure to include as many fire motifs as it could fit on its packaging, "That'll be 300 yen."
Izuku looked up to make eye contact with the man again and held in a squeak as he found him with a considering expression, seemingly scenting the air. He assumed that he was curious about why Izuku didn't have much of a scent. Others have commented on how unusual his scent was, being fainter than even a beta's.
"Card." the cashier startled at the deep voice.
He scrambled to grab the card machine and input the correct price, trying to ignore the residual tingles that ran down his spine at the rumbling sound.
When he turned the machine around, Izuku noticed the man's eyes were slightly more glazed. Odd.
The blonde alpha tapped his card as Izuku packed his items in a bag. When he heard the positive sound signalling the payment went through, the green haired cashier grabbed the receipt, tossed it in the bag, and offered it over,
"Thank you for your visit, please come again!"
The man's mouth lifted slightly in a smirk, gaze almost predatory, "Thanks."
As the stranger walked away, Izuku flushed, staring at the broad back before it was obscured by automatic doors. He thought he smelled something musky and pleasant in the air but he wasn't too sure.
The next time he saw the man was a few days later. He was on the night shift again, except this time he wasn't alone. His coworker was an omega girl, fresh out of high school. She was quite popular with the alpha and beta customers who came in, especially because she had a friendly personality. Though, unfortunately, this occasionally brought trouble—through no fault of her own, but rather, the hormonal alphas that came in. Luckily, he hadn't been present during any of these incidents, but he felt sorry she had to go through that.
They got along fine, but he personality felt she was a little young for him to feel too close to. She was definitely a welcome presence during a boring shift, though.
This time, when the strange man walked in, he looked a little less tired and a little more composed. With a back straighter than Izuku's probably had been since birth and a similar suit once again pressed to perfection, he immediately made eye contact with Izuku—something that differed from his last visit. Izuku suppressed the shivers threatening to travel through him. There was something about this guy that kept doing something to him...
He turned his head away and, in the corner of his vision, he saw the man walk into an aisle. His coworker started gripping his arm beside him.
"Midoriya!" she whispered, "Oh my god!"
The squeezing became slightly painful, "Huh?" he responded, intelligently.
She seemed to point at the man who walked in with her eyes, "It's not everyday you see a-" she stopped abruptly.
They both turned to the man in question, who roughly set down another bag of undoubtedly absurdly spicy chips and a box of candies.
"Y-Yes right away, sir!" his coworker said in response, ringing up the items, "That'll be 355 yen, please!"
This time, the man took out coins from his wallet, counting out the exact change needed. Instead of dropping them in the tray like expected, he handed them over directly—to Izuku.
Flustered, he hurried to grab the coins, having to scoop them off an upturned palm. His fingers brushed against the much bigger hand and the contact was electric, shooting up his arm. He gritted his teeth, holding in the definitely embarrassing noise that would have come out of him.
He faintly heard a low rumble.
"T-Thank you!" spilled from his mouth as he counted the coins and put them in the register. Huh, the man had obviously carefully counted the amount needed to pay for his items... Yet, there was 5 yen over in the form of a 10 yen coin. And he could have sworn he saw a 5 yen coin as the stranger counted out his coins... maybe he just wanted extra change?
"H-Here's your change!" Izuku went to drop the coin in the tray but a hand intercepted him, long pale fingers wrapping around his own tanned ones, urging him to loosen his grasp. He uncurled his fingers and the coin dropped from his palm to the alpha's.
The touch lingered for a few seconds more, making Izuku abnormally warm and sending sparks through him once again. This time, the sensations seemed to be brewing into something bigger, culminating into a feeling he wasn't able to identify before the man pulled away. Izuku mutely observed drooped eyelids, and a smirk even more smug than the last.
Those long fingers absentmindedly played with the 5 yen coin between them, "See you again, bunny." he squeaked at the nickname.
After he left, his coworker talked his ear off about how the man was acting, shaking Izuku while screaming about the attention he got; "It's like I wasn't even there!"
When prompted to explain, he claimed he was also just as confused but that it was probably nothing, that the man most likely acted like that to many others. Sad that she wasn't getting her fill of drama, she agreed that that was probably the case, especially considering he was a beta (he technically wasn’t, but she didn't need to know that). Betas weren't necessarily discriminated against (especially in comparison to omegas) but there was the occasional passing comment about them in regards to how they didn't really fit into the whole instincts scramble. They did play an important part in society, a balancing role that was a balm to an otherwise chaotic world of alphas and omegas acting on instinct. This appeared to not be acknowledged by everyone, though.
In his coworker's case, he was certain it wasn't a passive aggressive sentiment she was expressing; the truth was just simply that instant attraction was much more common between alphas and omegas. Betas didn't have the instincts, the same reaction to pheromones, nor the drawing scents—all of which would push themselves or an interested party to decide to immediately pursue the other. Therefore, it was much less common.
Izuku rubbed away the ache that grew in his chest at that thought. He ignored his coworker's bemoans about how she wished that she got more attention from the mystery man, and tried to distract his mind from the feeling that still lingered in his fingertips.
He definitely swore he could smell something rich and spicy after the man left... it made a warmth bloom within him.
After the second time the man visited, Izuku started to constantly feel warm, he would also get headaches, overstimulated by everything around him. Everyone smelled... stronger for some reason. Additionally, the textures of some of the things he touched repulsed him. He wasn't sure what was happening, but it was annoying. Though, thankfully, it wasn't enough to fully impede him in his daily life so he mostly ignored it.
During another shift, this time in the late daytime, Izuku manned the counter alone as the automatic doors slid open. A familiar smell drifted in, smoky and spicy. He couldn't help but try to take in more, inhaling deep breaths. When he caught himself leaning forward, he forced himself to straighten up, cheeks red.
The blonde alpha with the hypnotising stare walked in once again. He lingered at the door for a few seconds, his gaze boring into the green haired cashier. Izuku froze, breath caught and eyes wide. It was only when the alpha turned away that his lungs could finally expand again.
When the man returned, he set one item down this time. It a bottle of some sort, the kind with those twist caps you had to press down.
He desperately ignored the way the blonde looked at him with intent, and picked up the bottle, about to scan it when he choked at its label.
Pre-natal vitamins.
He flushed at the chuckle that sounded from the man in front of him, afraid to look up.
Ah, right. He then remembered what pre-natal vitamins implied. Of course an alpha like that had a partner already... why was he even feeling disappointment in the first place? It's not like he wanted to be with him... right?
Izuku scanned the bottle, "That'll be 200 yen, please."
Because he had continued to look down at the counter, he hadn't realised that the man leaned closer—partially closing the height difference between them—until a rough voice brushed against his ear,
"Here you go." a hand encased his, turning it so his palm faced upward before another hand came to rest on top of it. The alpha's two hands surrounded his single one in a way that made it almost disappear. He was massive... Izuku couldn't imagine how big he'd be next to an omega—he already made the cashier's beta-sized figure look tiny in comparison. The thought of the man next to an omega made him a bit upset for some reason.
When he pulled away, Izuku subconsciously followed, wanting the sparks and warmth sent through him to stay.
There was something solid in his palm, and when he looked down he saw two 100 yen coins.
His breath caught when warm fingers brushed his hair from his face. Dizziness descended upon him as he was surrounded by pure scent. He felt funny...
"Hey, bunny, why don't we-"
"Midoriya-kun!” a new voice interrupted.
Izuku flinched back, realising how close the two of them were, and whipped his head to the door.
Stood in front of the automatic doors was his boss, the shorter old man who helped him get off his feet.
"Y-Yes, Takeda-san?" he squeaked out.
The man walked closer and a rumble sounded from the blonde at the counter, "We got a new shipment of those instant noodles that sold out, could you spare a second to help me unload the boxes?"
"O-Of course!" he fumbled with the latch on the waist-level door that let him into the rest of the store, but stopped when he heard a tsk.
Looking up from under his lashes, he saw the alpha scowling, glaring at the floor like it killed his family.
When Izuku finally got the latch open, the man abruptly grabbed the bottle, his scowl dampening a bit when his eyes met the cashier's,
"Next time, bunny." the blonde stomped off, almost bumping into his boss on the way out.
Izuku stood there in a daze before realising that he was doing something. Hastily, he opened the door and stepped out,
"Ah, no worries Midoriya-kun, there isn't really a shipment."
Izuku looked up at Takeda in confusion. The man continued walking over before patting his arm, "I just thought you needed some help. That man... he was getting awfully touchy, wasn't he?"
The employee flushed, unwilling to tell his boss that he kind of enjoyed what the blonde was doing. That would be mortifying to admit.
"U-Uh, thanks! I'm glad you always have my back, Takeda-san!"
The old man chuckled, "No worries, son. Can't have one of my hardest workers snatched up by a prime, can I?" he walked past the green haired man, "Now, I did come for a reason. If you'd be so kind, I’d like some help reading this month's profits and losses, you know how poor these old man's eyes are nowadays."
"No problem at all!"
A prime? What did that mean?
And when that man said next time... did he simply mean it as a farewell or did it mean something more...? The thought of the latter being the case made his heart pound but he internally scolded himself. He had no right to feel any sort of way for someone who had no reason to be interested in him, especially someone who was clearly already taken. Stay in your lane, Izuku, you're not even from this world.
That didn't stop his dreams from showing him tantalising scenes featuring him and a certain red-eyed alpha.
The weirdness with his body was only getting worse. He found himself often out of breath, overheated, and aching for something he couldn't identify. His overstimulation was driving him crazy, even making it hard to sleep in his bed at night. He definitely could smell people distinctly now... was he noticing the scents that everyone talked about? That wasn't possible, though... his physiology wasn't built to pick them up.
People were starting to stare at him on the streets and he wasn't sure why. One customer at work even strongly suggested she take him home for some 'fun'... he turned her down but it took a few strong refusals to get her to leave, and when she did, she did so in a huff. The one shift he had with a beta coworker, they expressed concern for his state, and when he insisted he was fine they notified their boss anyway who strongly encouraged him to recover at home.
This was where he was now, arriving at his door. His breathing was a degree away from being classified as panting, and he was practically stumbling as he dug out his key.
He wanted something—badly. He wasn't sure what but... he had been strangely hard for a good portion of his walk so he had an idea. He'd never been an especially sexual person, so why now?
So out of it, he didn't notice the new presence,
"Hey, bunny."
Large hands rested by both sides of his head against the door in front of him. He tensed, heart rate picking up upon feeling a warm breath brush against his nape. All at once, that spicy scent that recently frequented his thoughts hit him, throwing him off-kilter.
Izuku stayed stock still, even when a nose buried itself into his unruly hair. He wanted to say something, ask the stranger why he was here, how he found him, what he was doing, and if he could back off so Izuku could think.
But he couldn't move a muscle—fear and something fiery flooded him in a dangerous cocktail. It kept him rooted in place and caused his throat to tighten.
"Missed you... you smell better and better each time I see you." he nuzzled into green locks and Izuku felt tremors vibrate down his spine and to his fingertips, "As much I liked visiting you... well, here we aren't getting fucking interrupted." the man's hands made their way to his hips leaving fire in their wake. He almost wanted those fingers to grip harder. Almost, because if he really wanted that, wouldn't he be sick? "You know, you smell like you're newly presented, like you're going through your blooming heat. You're way older than the brats who usually go through those... but all the signs are there, aren't they?"
At this point, Izuku barely understood what the alpha way saying, revelling in the methodic brush of fingers over his hips. As much as he tried to tell himself it was wrong—that this man deliberately found him and was touching him without his consent—he desperately wished his clothes weren't in the way, craving skin-on-skin contact like he craved air.
The alpha continued, "Fuck... when I first saw you, I didn't think much... and then you started fucking blooming... and just thinking of fucking extras sniffing around you," he growled, the rumble travelling throughout the green haired man's whole body. He noticed his underwear were oddly damp, "I wanted to fucking kill them, almost did. But you're here. You're with me." It was clear he was babbling at this point, spitting out random thoughts.
His next words made a moan involuntarily escape Izuku, "And you're mine."
Finally, with a monumental amount of effort, Izuku turned his head to look at the alpha, mouth open to finally say something. What, he wasn't sure, but he never got to find out. In the next moment, his mouth was silenced by another.
The way the man kissed was rough, aggressive, but strangely revering as if he was devouring something he wasn't sure he'd ever get again.
Since Izuku's mouth had been opened to speak, the alpha was able to slip his tongue in, the muscle insistently sliding against his own in a sensual dance.
His body was pinned with the other's, the two glued together by the arms that slid around him. The contact was electric, devastating, but somehow everything he'd ever wanted even if he hadn't known he'd wanted it before this moment.
He felt something stiff pushing impatiently against his abdomen and he had a good idea of what it was. His hole twitched.
Once the need for air became demanding, he pulled back, only for the lips that separated with his to follow. He only got one deep breath in before they were kissing again, the alpha growling, and the vibrations travelled from his chest and throughout Izuku's body. The man's hands started moving like they wanted to touch every inch of his partner.
When the alpha bucked into him, Izuku couldn't help but whimper. The blonde stiffened in response, and, against his kiss-bruised lips, he could feel the other man's own lift in a snarl. He parted his mouth from Izuku's, but only by a millimetre, as if any distance was painful.
Their breaths mingled into one, and the man’s next words vibrated against his skin, practically whispered but as powerful as a shout, "Open the door, now."
The green haired man shivered before he resumed the search for his key, but this time he was frantic, fingers shaking. Was it in fear? Anticipation? He wasn't exactly sure of anything anymore, but he knew he couldn't refuse the order.
When his fingers finally caught on the key ring, he lifted it out only for the keys to be snatched out of his grip. The blonde man hurriedly jammed the key in its hole and twisted until there was a resounding 'clunk'.
For some reason, watching the action made Izuku whine.
It wasn't long before the door was opened, and Izuku was shoved inside, before being pinned again—this time, on the other side of the door. The lock clicked back in place, cementing his fate.
The alpha buried his nose in Izuku's hair again, taking a deep breath before his face travelled down to the crook of his neck. He took a few sniffs before startling the other man with a long drag of his tongue, “Delicious." was murmured into his skin.
Izuku felt like he was descending into madness, his body was suddenly a melting pot and his insides were molten. He keened as he gripped blonde hair with both hands. A leg instinctively came up so he could wrap himself around the body pinning his as much as possible. Hands came down to aid his objective, travelling to cup his ass in support so he could wrap both legs around the other man. The friction between their lengths—obviously so different in size—was addicting. He barely remembered why this was wrong when it felt so right.
The alpha nipped at his neck with dangerously sharp fangs, "Fuck, so much better than I imagined. Gonna fuck you so hard, baby, gonna plug you with my knot. You won't be able to leave, ever. Fill you up to the brim—you want that, don't you, bunny?" he punctuated his sentence with a grind.
Izuku's head titled back onto the door behind him, mouth open in a silent exclamation, and legs squeezing in an attempt to prolong the sensation.
The blonde squeezed an ass cheek, "Answer me, bunny."
He squeaked, "Yes! I do! Please!" the man answered with a purr, nuzzling into his neck.
Izuku's eyes were fogged over, as if in a daze, but he didn't allow himself to succumb to the feeling completely yet, "W-Wait," the alpha paused, grip tightening, "Mmn…N-Name?” his ability to form sentences was rapidly decreasing, but he thinks he managed to communicate his inquiry effectively enough.
"Katsuki." In the back of his mind, he noted the man didn't offer a family name. Katsuki leaned back slightly to make eye contact, irises the colour of blood burning a hole through him with their intensity, "You can use that if you need something scream out while I'm making you cum. That, or alpha." Izuku's face was suddenly 2 times hotter.
Katsuki started walking, not faltering despite Izuku's weight no longer being supported by the door. Instead, he was held with the alpha's strength alone.
It wasn't hard to find the bed since he lived in a studio, though he dimly wondered if it could fit the both of them, or handle both their weights. His back was lowered onto the mattress, a large hand on his spine controlling his descent. The alpha's arms shifted, one supporting him as he hovered above Izuku, and the other on the green haired man's hip, keeping their pelvises pressed together.
Izuku squirmed, "You're so needy for my cock, aren't you?" Katsuki rumbled, smug, "Such a good omega, already ready for your alpha to pup you."
"O-Omega? 'm not..."
The alpha chuckled lowly, "Not an omega? Oh, baby..." normally Izuku would bristle at the condescension, but he couldn't really think straight at that moment, "You know, I was unsure too, at first. But only an omega could smell this good, could bloom so beautifully for his alpha, could slick this much for his alpha's cock."
Katsuki reached down and tore Izuku's pants enough to have access to the apex of his thighs. He reached into his underwear and brushed two fingers against his tender hole, the contact strangely smooth. The touch against his most intimate part made Izuku's toes curl, an embarrassing moan escaping him. He clenched as the hand pulled away as if his body was beckoning it back.
He'd never been that sensitive before... had he?
The hand was displayed to him, now shiny with moisture, "Look at that." the alpha spread his fingers apart, causing a string of something clear to form between them. Izuku could only stare in disbelief as he continued, "What other man could slick so deliciously for his alpha other than an obedient omega?"
Izuku watched as the other man brought his fingers to his nose, witnessing pupils dilating to the point that scarlet irises were almost completely consumed. Katsuki groaned as he shoved the slick-covered digits in his mouth, "Fuck. Tastes so good. Can't get enough." his eyes focused back onto Izuku's, a bit more wild than they had been a moment ago, "Need more."
Before he knew it, his pants and underwear were pulled off completely, and there was a blonde head between his spread legs.
Izuku whined at the sensation of Katsuki's heavy panting brushing air against his hole, stare boring into the puckered, pink flesh as it twitched at the attention. The green haired man once again buried hands into spiky hair, this time torn between pushing away or pulling closer. Ultimately, the decision was made for him when he felt a tongue lave his opening, the sensation making him grip the man's hair tighter and clench his thighs around the head as if to make sure he didn't stop.
Katsuki growled against him, his licks becoming firmer and more frequent, barely dipping in before maddeningly pulling back out. Izuku could only arch his back and scream out his pleasure. His moans pitched higher when a finger slowly entered him followed by another until there were eventually four fingers thrusting in and out of him, curling deliciously. The stretch was like nothing he’d ever experienced before—he was helpless to the feeling, unable to do anything but beg and plead for more until his body wound itself into knots, ready to fall apart.
"I-I'm- I feel! I'm gonna-!"
The alpha's mouth was occupied, licking, sucking, and biting at the skin of his thighs, but his eyes met Izuku's and the message was clear,
'Then cum. Now.'
And, after a pointedly rough thrust into his prostate, he did just that. His climax raged through his body, violent and consuming like a tsunami, engulfing him in pure sensation. White ropes of cum shot out of his untouched dick, painting his skin and his shirt ivory.
Izuku panted, opening his eyes in time to witness Katsuki licking every inch of slick off his fingers as if missing a drop would be wasteful.
Their gazes met, the dangerous glint in the alpha's still present if not doubled down.
After orgasming, Izuku's capacity to think was slightly restored.
What the fuck was happening? Did a stranger just eat out his asshole? And finger him? And he actually came from it? What was that moisture and why was it coming from his ass? And what was that about being an omega?
He watched Katsuki's dilated pupils slide into slits as he crawled his way back up Izuku’s body. In a panic, he pushed at broad shoulders, legs tensing as if readying to flee,
"W-Wait, stop. You shouldn't do this."
The alpha growled, this time in displeasure, his scowl returning. He pushed forward despite the other man's efforts until his face hovered above Izuku's.
"Oh yeah? Are you sure, bunny? How can you say that when your body's practically begging for a knot?"
He grabbed at Izuku's thighs and pushed them up so his knees almost made contact with the bed below him. The position was extremely exposing and embarrassing, but no matter how much he tried to push his way out of the position, he couldn't.
"Look at that," he looked down at the exposed entrance, "just came but ready for more, to be stuffed to the brim. What a slutty cunt."
Izuku's face burned, "C-Cunt?! I don't have one, I'm a man!"
The laugh that spilled from him was dark—he leaned closer, "A hole this breedable can't be anything but a cunt, can it? Oh, and I'll breed it alright. You want that, don't you, omega?"
The supposed omega squirmed, "N-No!" he said even though his whole body lit up at the suggestion, practically screaming 'Yes!'.
"So you don't want this?" his eyes couldn’t help but follow Katsuki's hand as it travelled to the top of his pants, opening them and shoving them down along with his boxers.
The cock that was revealed was massive—could that even be considered a human penis anymore? It rivalled the length of a forearm with the girth of a soda can. It looked almost angry, blaring red with thick veins pushing at the surface of its skin. It was standing at attention and refused to be ignored. And, what was that weird raised part around the base?
He couldn't be thinking of using that monster on Izuku, right?
Despite his fear at its size, Izuku couldn't help but be captivated by slow strokes of the alpha's hand curled over his length, mouth watering as he watched a bead of precum gather before it trailed down the engorged head. He swallowed.
Katsuki groaned, “Fuck, baby, look at you, drooling for my cock." he shifted so that the head of his length kissed Izuku's opening. It squeezed around nothing, pleading, “Guess we can't go further than this, huh? I'll stop here then." he said even though the alpha’s teeth parted to show a glimpse of his fangs and his hips stuttered. As he nudged against the hole, his cock smeared precum in its path.
The fog in Izuku's mind returned at the sensation. Tears gathered in his eyes as he could only watch, his whole body buzzing and begging, 'Almost! Almost there! Just push in a little more!'
When the alpha started to move away, he scrambled to pull him back, fingers balling in his shirt, "No! Please! Please don't stop!"
The grin on Katsuki’s face was downright maniacal, "But you said we can't, bunny."
Izuku ached in a way he never had before, unbearable emptiness clawing at him, and the solution was right there. He bucked his hips in an attempt to alleviate his suffering, but the friction it created wasn't enough, "Nonono, we can! I need it! I need it in! Pleeeease, alpha?"
At the title, something seemed to snap in the other man, he snarled, fingers moving to dig into Izuku's hips. He bared his fangs fully, the sharp teeth dripping with something that didn't look like saliva,
"Good omega."
At that, he abruptly shoved his whole length all the way in until their hips met. Although the sudden intrusion stung a bit, Izuku wasn't in as much pain as he should have been taking a cock up his ass for the first time, much less one with such monstrous proportions. Instead, he saw stars, the heat that was brewing in him threatening to boil over. Pleasure ignited every nerve in his body.
Screaming at the unexpected sensation of a cock filling him, he shoved his hands under Katsuki's shirt, nails digging into the skin of his back. His hole tried to squeeze around the alpha's length but it was stretched so wide that it struggled.
Katsuki roared, "Fuck, Izuku! Feels so good!" the alpha's dick twitched inside of him when Izuku moaned.
It wasn't long before the alpha slowly started pulling out. The omega whined, trying to wiggle back on to no avail. When the tip was about to exit, the cock suddenly shoved right back in with a violent thrust. The floodgates opened and Katsuki continued fucking into Izuku's stretched hole fast and hard in a brutal pace. He positioned himself directly above the omega with forearms taking their places beside his head, effectively caging him in. Izuku could only take it, groaning and screaming his approval at the cock that was carving a place in his body with every rough thrust.
"Fuck, yeah, gonna- mmph -gonna breed this fucking cunt, omega. Gonna fffuuck a pup into you, keep you- keep you knotted for hours until it takes."
Izuku squealed, "Yes! A-Alpha, please! Breed me, ne- ah! -eeed it!"
Katsuki growled, sliding out completely this time. Before the omega could protest, he was flipped over, his chest pushed to the bed and his ass pulled up. In an instant, he was filled back up. A hot, sticky torso was pressed up against him, rumbles traveling from the alpha’s chest into Izuku making his skin tingle.
The alpha resumed his aggressive pace. The scraping of his teeth against the crook of Izuku's neck caused the omega whine, chest tugging with bone-deep want. He tilted his head to give better access,
"Mine. You're mine, omega. No one else's. I'll fucking kill them. Only mine."
At the alpha's words, tingles travelled from the omega's core and to his fingertips curled into his sheets,
"Ah! Yes! Yours! Katsuki's! My- nmph! -alphaaa!"
The hands on his hips gripped harder, ensuring bruises would form, "Yeah, your ffuuucking- fuck!- alpha. My omega. Mine!"
Tears ran down Izuku's face and soaked into the cotton below. He lost himself in the pleasure that each and every thrust shot through his body. He could feel the tell tale build up that indicated he was close, pure sensation compounding into something he knew would obliterate him. He welcomed his eventual falling apart with open arms, in fact, he felt he would die without it. Izuku tried to push back into the alpha further, baring even more of his neck in a silent plead,
"Ka-tsu- ah! Ka-! Ka-cchan! Kacchan!"
Fangs clenched and unclenched over the crook of his presented skin, like a promise,
"Fuck! Omega! Mine!" Somehow, Katsuki's thrusts got even faster, and Izuku screamed incoherently, unable to form words. His hole squeezed to no avail and his toes curled.
Potent bolts of electricity danced over his flushed skin as he came, ingraining into the farthest reaches of himself like a brand. He wailed his release as the dick that bounced uselessly below him once again shot ropes of cum. His vision whited out as he rode out the waves of his orgasm, the cock still brutally stroking his walls drawing it out.
He faintly registered animalistic snarls from above him, and felt something unfamiliar bump against the rim of his entrance with each thrust.
Izuku continued to moan as Katsuki rushed to his own end, thrusts becoming more erratic and desperate.
Finally, with a final resounding snarl, the alpha shoved his whole cock into Izuku. The omega squealed as his entrance was stretched wider around a fist-sized bulb at the base of the shaft inside him.
Once his hole was plugged, the alpha started spurting an obscene amount of hot cum into the channel. Simultaneously, he buried his sharp fangs into Izuku's neck, jaw gripping like it refused the possibility of being ripped away.
With the sensation of being filled to the brim and the pain-pleasure of being bitten thundering throughout his whole being in tandem, another orgasm ripped through Izuku with no warning. He sobbed while the growling alpha above him continued to spill spurt after spurt.
Coming down from ecstasy, Izuku’s body started to relax. Slowly, he felt himself drift away, body boneless and exhausted from the brutal fucking it endured.
When he finally slipped away into unconsciousness, Katsuki withdrew his fangs, blood pouring out of the punctures. He purred as he lapped up the new mating mark, cleaning it. Once he finished, he carefully shifted the two of them to lay on their sides, still locked together at their hips by his knot. His purrs grew even louder as he rubbed his omega's bulging belly, filled with virile seed.
Hopefully, he'd successfully bred Izuku. Though, it was fine if he hadn't because they had plenty of time to keep trying. After all, they had Izuku's whole heat ahead of them. Not to mention their whole lives—there was no way he'd ever let his omega escape now that he had him.
From the first time they met, he knew Izuku was his, and he never let anyone touch what was his. He'd keep his bunny safe, within his reach at all times.
There were many times where being a prime alpha came in handy, but he had to admit, making his mate bloom for him was the best so far.