Chapter Text
Eijirou Kirishima was a non-presenting person in a world full of strong alphas, omegas and betas. Which was fine by him. He didn't have to deal with pheromones or suppressants or mating. He could roll out of bed in the morning and not worry about covering himself in scent blockers before he left the house or having to track a heat or rut.
He only occasionally cared that he didn't have a second gender. Like when he found his gaze on his best friend and wondered what he smelled like outside of the warmth of his cinnamon soap and manly deodorant. Like right now. This morning Katsuki was making himself a valerian root tea to jumpstart his meds so he didn't lose it and knock Kaminari’s head off for looking at him funny while he was still a little wired from his rut. He was shirtless, with pale blue scent suppressant patches stuck to each of his wrists and either side underneath his jaw.
Bakugou turned as he sniffed the air, pupils flicking to slits for a moment, before he stalked across the kitchen and shoved his face straight into the crook of Eijirou’s shoulder, immediately rubbing his cheek over his neck and one side of his face.
Ah crap, his suppressants probably hadn't kicked in properly yet.
“Bakugou, let go man. Let me finish your tea.” Eijirou urged, face flaming as he felt surprisingly gentle clawed hands knead at his hips and push him against the kitchen counter. He would never get used to this. Most alpha's completely disregarded anyone that didn't have a second gender, but Katsuki was constantly slipping into a strange possessive state and rubbing his scent all over Eijirou.
A little too intimately for company sometimes.
Last week they'd had two strangers in the house to measure the kitchen for the new one they were getting fitted; an omega and a beta. It was a good thing Kaminari and his alpha boyfriend Tetsutetsu had been there to help when Katsuki decided the tiny omega was somehow a threat and began growling. All the poor guy had done was smile and shake Eijirou’s hand!
But Katsuki had spat right in his hand and shoved it up Eijirou's shirt to smear his alpha saliva all over his abs and pecs while tearing the blocker patch from his other wrist with his teeth to rub it over his face. The female beta had tried to put out a calming scent to ease the tension, but Katsuki had snapped his teeth at her and shoved Eijirou behind himself as he puffed out his own chest and postured.
Eijirou had apologised and dragged the angry alpha to his room and locked him inside before returning to the kitchen as Tetsutetsu rolled his eyes and sat down outside the door to make sure he didn't break out. Kaminari had sprayed scent neutraliser around like a madman and explained that Bakugou was imminently due to go into rut.
The two workers had nodded their understanding and continued on with their task, though the omega had continually cast Kirishima strange glances, before asking him if he needed to go to his mate.
Eijirou blushed and assured the man that he and Katsuki were nothing but friends, lifting his chin to show the gland-free underside of his jaw and lack of a claiming bite as he waved away the omega's concern.
“Oh. But you smell kind of like an alpha, I thought…do you want to maybe get a coffee with me tomorrow? I know a really good place downtown.”
He hadn't even had the chance to politely turn the guy down. He had no idea how Katsuki had even heard from his bedroom down the hall or if it was a coincidence, but the blond chose that moment to violently punch straight through his bedroom door and attempt to rip it off its hinges, snarling.
Tetsu had to wrestle Bakugou into submission while Kaminari attempted to stick him with a suppressant booster shot and Eijirou ushered the poor people out that had set the alpha off.
They put him in Eijirou's room with his rut toy, and Eijirou had slept in Katsuki’s bed for the next couple of nights, trying not to think about the man he'd been half in love with since highschool furiously masturbating in his bed. He hadn't been able to stop himself when his own hand had slipped into his borrowed pyjama trousers as the grunting and groaning started back up the second night after midnight.
“Eijirou…” Katsuki’s low growl pulled him from his thoughts as he felt something hard brush against his hip, before the blond pulled back a little, panting. His pupils were blown wide rather than slitted now, and four sharp canines had descended from his top jaw and two up from the bottom. “You smell…different.” His voice cracked as he leaned back in to nose at Eijirou's neck, “fuck. Feels like I'm gonna rut again, what the hell?”
But Eijirou was too busy short circuiting over the fact that he could feel his best friend's hard dick against his thigh again. His mouth flooded with saliva and he swallowed thickly, before gently but firmly setting the blond away from himself. “Do you wanna go back to your room?” He asked, biting his lip. This definitely wasn't normal, and while Bakugou had always been angry and oddly possessive over him, he'd never been as bad as he had the past couple of months. Even when Eijirou had gone on a couple of dates with a nice omega guy last year when he was sure he was never going to present. His best friend had sulked for three days straight and refused to come near him because he ‘smelled disgusting’.
“Yo, Kacchan what's with the stank?! You literally rutted last week, you should smell like daisies for a few weeks compared to what you usually do.” Kaminari pinched his nose as he walked into the kitchen, turning immediately on his heel to march out. He came back a moment later and unapologetically sprayed the can of pheromone neutraliser directly on the alpha and then around the kitchen. “I think you should go to the doctors, this ain't right. You've been really hinky for like two months now.”
Katsuki's pupils slowly returned to normal and a scowl settled on his face. He stepped away from Eijirou, staring at him as though expecting him to sprout an extra head any minute. “I don't need the doctors, I'm fucking fine. Now get out of my face so I can get ready for work.”
“You sure that's a good idea Bakugou? Maybe you should take it easy today and go in tomorrow?” Eijirou tried to reason as he poured water from the kettle into the blond's large mug to finish his valerian tea.
“I said I'm fine! You're the one that smells funny. Have you been out with some weird alpha or something?” Katsuki demanded angrily before catching himself, cheeks flaming as he turned and grabbed his cup, stalking from the room with a low, rumbling growl.
“Geez. He needs to take more than just a chill pill.” Kaminari rolled his eyes and grabbed a stepping stool from under the counter next to the bin, unfolding it to climb up and grab cereal from atop the overhead cupboard. “Ignore him, he's probably still just jealous of those two contractors being in his territory and by his ‘not-mate’, that's all.” He wobbled on the steps and Eijirou quickly moved to steady him with a hand to the shoulder.
The blond's nose twitched and he frowned, casting Eijirou a confused look.
“Actually, have you been around any strange alphas?” He asked as he grabbed Kirishima’s forearm for support and climbed down, before leaning in to sniff at his pec and around his underarm, the only places he could really reach, even on his tiptoes. He looked up and stared at the underside of his jaw for a long moment before shrugging and stepping away to pour his cereal.
“Dude I've been to work and back, that's it. I got a new body wash last week, but it's just patchouli, sage and eucalyptus or something.” Eijirou had no idea why he apparently smelled different all of a sudden, but he lifted his arm to sniff himself, a little self conscious.
“Oh yeah, I totally used some this morning, it's nice! But definitely not what you smell like right now.” Kaminari pursed his lips in thought and opened the fridge to grab milk for his bowl. He put it away and chewed the inside of his cheek, “has anyone in your family presented super late before?”
“No? ‘Super late’ is like twenty two. I'm already twenty four, there's literally no way. My sister never presented either, and she's twenty eight now. I kind of expected to not present as soon as she hit twenty two and hadn't already.”
“Hmm. Maybe it's nothing then. Do you feel any different?” Kaminari picked up his bowl and dug a spoon into it, immediately stuffing sugary cereal into his mouth and talking around it, “may-bee ish just an alpha at the fire station dat yoo can't smell?”
“Yeah, maybe. I don't feel any different.” Eijirou fought a pout as he dumped two scoops of protein powder into his to-go shaker and topped it off with full fat milk. He didn't want Bakugou getting hard and scenting him because of another person's smell.
The thought made him kind of mad.
Almost four hours later Eijirou slid down the pole in the fire station and ran towards the truck, more pumped than he was concerned for once.
He could smell the smoke before they even drove down the side streets and turned onto the block, fingers twitching and muscles bunching ready to leap into action.
He was thirsty, but he'd drank a pint of water before leaving the station.
His skin already felt hot and he hadn't even been near a fire today.
He shook it off.
He had a job to do.
But as soon as he climbed from the truck he could smell something other than acrid burning. It was sour and tasted how he imagined fear would against the back of his tongue. It had him yanking down his visor and running straight into the burning building as his team yelled at him to stop.
But he couldn't.
Saliva flooded his mouth even as smoke stung at his lungs, but he found the woman -the omega- and her baby quickly.
“Alpha!” She cried and thrust her baby into his arms, coughing and choking on smoke even as Eijirou pulled the baby close and grabbed for the woman, tossing her over his shoulder. The need to protect was almost overwhelming as he felt his eyes sting and his gums and stomach ache.
He should have put a respirator on.
Eijirou had always wanted kids. He'd been hoping he would be an omega or even a beta so he could carry his own babies easily. Alpha pregnancy was incredibly rare and sometimes complicated, but he was more than happy to adopt too.
But he'd never presented.
The baby was crying in his arms and the woman over his shoulder had gone limp by the time he burst through one of the downstairs windows and fell to his knees, hacking and coughing as half his team surrounded him and poured water over them all as the rest manned the hoses to control the blaze.
“Are you goddamn stupid?!” Chief Aizawa growled as he yanked Eijirou's visor off and dropped to his haunches to look into his eyes, pulling down his bottom eyelids as someone took the baby from his arms and gently eased the omega woman from his other shoulder. He had no idea how he knew her second gender, but he did.
“Had..to...protect…them…” he gasped and dropped forward to his palms as his lungs screamed and burned. He blacked out less than thirty seconds later, only vaguely registering his face hitting grass.
Eijirou awoke with a start, sitting bolt upright as he grabbed the plastic mask over his mouth and nose to yank it down, eyes wide. His arm pulled and he winced, looking at the crook of his elbow as he heard a sharp gasp. He had a cannula in his arm with an IV attached to it. Well shit. He pouted as he flicked his gaze to where the gasp had sounded to see Katsuki, fists clenched in his blanket and expression worried.
“Hey man. How's it going?” He asked lamely.
“Are you fucking stupid?!” Katsuki snapped, eyes wet, “who the fuck runs into a burning building without backup?!”
“A...firefighter…?” Eijirou ventured a little sheepishly.
“No!? Don't you have fucking protocol?! Think about yourself first!”
“There was a baby!!” Eijirou snapped without meaning to and they both stopped, staring at each other for a long moment.
“How did you know there was a baby?” Katsuki demanded, eyes wide and confused.
“I- I don't know. Maybe someone told me? I just knew there was a kid in there and I ran in.”
Katsuki opened his mouth to say something, but a nurse walked in a moment later, “mr Kirishima, you're awake! Your mate was so worried.” She bustled over as Katsuki flushed and averted his gaze. “We did a chest X-ray, and your lungs look fine, you were very lucky. We need to take another blood test, but you should be able to go home in a few hours.” The beta said cheerfully as she leaned him forward gently to poof his pillows and then set him back.
She left and Katsuki only got redder, until he finally spoke, “they said I couldn't come in if I wasn't your mate, okay? And I don't know your folks’ number. You scared the shit out of me -us-!”
“It's fine man. Could you…could you hold me?” Eijirou ventured, looking straight at Katsuki. He wanted, no he needed physical contact right then. His best friend kind of smelled like cinnamon, smoke and caramel, and he wanted him as close as he could get him.
Bakugou didn't hesitate. He stood and dropped the roll guard, before climbing onto the bed to mold himself against Eijirou's side, shoes still on his feet, “I don't know how long I'll be allowed to do this, but they can drag me the fuck away.” Katsuki growled as he dropped his head to Eijirou’s pec and a low rumbling growl started up. “You smell good. Fucking idiot.”
Eijirou felt a smile split his face as lethargy overtook him and he slipped off to sleep.
A few days later Eijirou awoke in his own bed and threw back the covers, yawning. He'd been given a few paid days off work to recover, but he felt more than fine now.
He did feel kind of antsy though.
Like he wanted to bite and chew on something but he wasn't sure what.
Kaminari was out and Tetsutetsu was on duty at the station, so it was just him and Bakugou today. Maybe they could get all snuggled up on the sofa and watch something violent and manly.
He cracked his neck and went to shower, walking out with a towel wrapped around his waist as he always did. “Yo bakubro, you wanna order food? I don't wanna cook.” He called as he towel dried his hair and padded into the living room.
Bakugou’s attention snapped to him instantly and his pupils snapped to slits, before blowing wide.
It made Eijirou want to bare his teeth.
So he did. He couldn't help himself.
“Alpha.” Katsuki growled, quiet and low as he turned and flexed his jaw, canines growing, “Mine.” He caught himself a moment later and shook himself, brows knitting in confusion.
But Eijirou could suddenly smell that scent from in the hospital, and he felt his mouth flood with saliva. A strange, painful, tearing and burning sensation started on the underside of his jaw and slashed across one of his wrists.
He froze.
What the-
Katsuki groaned and bared his teeth, hissing in a sharp breath.
“Ei, I think- fuck. I think you're presenting.” He rushed out as he fumbled for his phone.
But Eijirou couldn't take his eyes off his mate's neck.
He wanted to bite him.
He dropped his towel and started forward, before catching himself.
Katsuki dropped forward off the sofa to slam the heels of his hands against the carpet and practically hissed, “if you don't get away right the hell now im gonna fuck you.” He punched the floor and opened his mouth, fangs descending fully as a distant ringing sounded.
“Yo, what's up big boi?” Kaminari's voice rang down the phone and Eijirou felt his whole chest rumble as he began to growl like an animal, nail beds stinging.
That was his mate that omega was talking to!
“Don't come home. Eijirou is- fuck. Fuck. He's an alpha. He's mine. MINE. MY MATE! I'll fucking kill you-!” Katsuki’s expression flicked to one of shock as he caught himself. “shit. I think he's my fated. Don't, don't come home…”
Eijirou felt a strange ache in his gums as four new teeth ripped through flesh. His eyes blew wide and he dropped to his knees as he felt his lower canines ache too, before more sharp teeth broke through his gums.
“Rut toy!” Katsuki exclaimed and bolted to his feet, running from the room. Running from him.
Eijirou followed immediately, grabbing for the blond as he darted past, claws skimming his sweatpants and catching. He scrambled to his feet and stumbled after his mate, saliva flooding his mouth.
He tackled Katsuki to the ground as they burst through the bedroom door, and suddenly they were rolling and snarling and snapping at each other.
Eijirou felt his head slam into the wall as Katsuki's palm slammed into his face, but he simply growled and rolled them over again until he was on top. “Mine!” He snapped, as a drop of saliva fell from one of his new, sharper fangs.
“Wanna knot, Ei?” Katsuki looked excited as he shoved Eijirou off him and scrambled for his bedside table, yanking the top draw clean out as Eijirou followed and grabbed him around the waist, throwing him to the floor.
Katsuki grabbed for a bottle of lube as his pupils blew wide again, nostrils flaring as he drew in a deep breath.
“Knot.” Eijirou echoed as he shoved his mate to the floor and mounted him, yanking his trousers down and off, hard cock sliding between his ass cheeks as he ground his teeth and tried to clear some of the savage need from his head.
Katsuki pumped lube onto his fingers and shot his hand back, stuffing himself with two immediately as he gasped in a sharp breath, “soon. I- oh fuck. I'm gonna lose it, your scent is too strong. I'm gonna fuck you raw. Mate you. Shit…”
“Yes, mate.” Eijirou growled and leaned down to pant against the back of Katsuki’s neck, rutting between his ass cheeks as he tried to keep a hold of himself long enough to let the blond stretch himself.
He felt a whine break from his throat and his gums began to sting as he mouthed and licked at Katsuki's neck. He was barely coherent, but he knew if he bit or fucked his mate too soon he'd hurt him and it was the only thing holding him back. “Need to fuck you.”
Katsuki shoved his hand into the abandoned draw and grabbed a fleshlight in a hard case with a groan when he felt the head of Eijirou's cock prod against his half prepped hole. “Hold on Ei, I'm not, fuck-” he pulled his fingers from himself and shifted to his knees, squeezing lube into the wide end of the rut toy designed to accommodate a knot, before shoving it between his thighs, “use this.” He encouraged, rocking his hips back as he supported himself with one hand and stretched himself with the other.
Eijirou stared at the toy for a long moment, confused, “why not you?” He asked, nosing at Katsuki’s ear before nudging his head to the side so he could lick at his scent gland. “You don't want me?” His hands were shaking as he dug sharp claws into thick carpet, but he couldn't physically pull himself away.
Katsuki was his. His mate. His.
Why did he want Eijirou to use a toy instead of mating with him? What had he done wrong?
Did he want to fuck Eijirou instead?
He opened his mouth to ask, but Katsuki was reaching back to palm at his cock, guiding the tip into the rut toy held firmly between his thighs, “I need a minute. I want you, I just need a minute, okay?” He rocked his hips back and Eijirou's mouth fell open on a long groan as his cock sank into soft, slicked up silicone.
Eijirou grabbed Katsuki's hips and slammed his cock deep as a growl started up in his chest. The inside of one of his wrists and the one side of his jaw throbbed and burned as though he'd cut or scratched them raw. He could taste blood in his mouth from the fangs that had descended over his already sharp teeth, and even though he was sure there were only supposed to be six claiming canines, he felt two more rip through his bottom gums as he thrust again almost savagely. He wanted to pin Katsuki's arms behind his back and force his head down to scrub against the carpet but he knew he was busy stretching himself.
Every sensation was heightened to the point where his entire body felt like it was on fire. His skin prickled and hurt like he was being stung repeatedly and even his toes had sprouted claws that caught and pulled in the fibres of the carpet.
He was an animal, he distantly registered. It was mating season. And this was his mate. His mate for life.
He forgot his own name until he heard Katsuki gasp it out, encouraging him to finally mate him properly. Even the tips of his ears started burning as he yanked his cock free of the fake hole and lined himself up as the toy thudded to the ground and Katsuki shifted to spread his legs and press his face and shoulders against the floor.
Eijirou moaned almost helplessly as he sank the head of himself into tight wet heat, claws scraping down muscular sides to leave red welts that flared against pale skin, a mark of his possession. Sharp pain shot through his gums and he felt his new canines grow longer as the shell of his ears stretched and burned and his vision tunnelled straight to where his cock was disappearing into his mate.
“Give you young.” He growled, shoving another couple of inches inside, tearing a ragged groan from Katsuki. The base of his cock had already swollen beyond what he could probably force into the blond and he threw his head back to veritably howl his disappointment as another set of canines grew, followed by another.
Katsuki tensed around him and shot a confused look over his shoulder at the sound, before his eyes blew wide with shock, “holy fuck, what the-” his words cut off as Eijirou shoved his cock as deep as he could and ground his hips against the blond's ass. The swollen, throbbing knot at the base prevented him from getting deeper and he dropped forward to support himself with a hand either side of Katsuki's head as his claws grew more and curled slightly.
“Can't knot. Too big. Hurt you.” He couldn't even tell if what he was saying made any sense as he panted, open mouthed and desperate, snapping and grinding his hips as heat coiled low in his gut and the crook of his elbow began to sting like he'd pressed a hot poker to it.
Katsuki shifted and shoved an arm beneath himself, grunting with the force of Eijirou's thrusts, “s’okay, good alpha. Good mate, hnng fuck-” fingers wrapped tight around his knot and squeezed and Eijirou cried out as release slammed into him like a truck into a solid wall, violent and destructive.
Blood burst to flood his mouth and he felt an overwhelming sense of satisfaction that went far beyond any orgasm, settling deep in his bones as he sucked and swallowed a mouthful of sweet metallic warmth, teeth suddenly buried in flesh to keep his mate still so he could pump every last drop of seed he had home.
Come began to leak and drip around Eijirou's pulsating cock as he thrust shallowly, still filling Katsuki with a helpless, drawn out moan into his shoulder. He gasped in a ragged breath and sat back a long moment later, blood smearing his lips and chin as he felt a rush of liquid around his cock and groaned his disappointment at himself. His knot had been too big to plug his mate, and as Katsuki shifted to pick his head up and shake it, more come splattered to the floor and ran down both of their legs.
But Katsuki didn't seem to care at all that Eijirou had messed up their first mating, simply pulling his hips away with a panting breath that became a quiet moan when more come rushed from him as he sat up and turned. His pupils were so blown his eyes looked almost completely black, only a thin ring of red remaining. His own alpha fangs were dripping with saliva, and his cock was still rock hard with a small bulge at the base.
Katsuki gave no warning as he lunged forward and sank his teeth right into the crook of Eijirou's neck and shoulder, shoving him to the floor as he desperately patted the floor around them for a moment. Eijirou's body suddenly felt doughy and pliant, but the effect didn't last long, even with his mate's teeth still in his neck.
“Mine. Mine, mine…” Katsuki chanted as he pulled back and licked the blood from his sharp teeth, bloodied tongue simply smearing red over his lips as he tried to clean them. He dropped his face to Eijirou's ear and he leaned in to lick along the shell. The top part felt longer somehow, but Katsuki was purring against his face as something plastic pressed against his hole, before a huge rush of cold lube soaked his ass.
“You look like an animal, alpha.” He groaned into his ear, before a finger slid inside Eijirou without warning. He snapped his teeth but caught himself quickly, claws raking holes into the carpet as he forced himself to relax, mind full of a think primal fog that told him to stuff his knot into his mate and fuck him again without waiting for it to go down.
Katsuki was an alpha, he could take it.
A second slick finger stretched him, snapping his attention back to his mate as Katsuki bit his lip and screwed up his face, clearly trying to keep a hold of himself. “Your scent is driving me insane, Ei. I can't. I need to knot you so bad. So fucking bad.”
“Do it. Now. Fuck me.” Eijirou demanded as he made to sit up. Katsuki growled and pulled his fingers free, clearly fighting an internal battle with himself as his claws grew. He held his breath and glared at his hand until they shrank again and snatched up the lube, squeezing so much into his palm that it splattered to the floor.
“Soon. Fuck. Just a little more.” He slicked his cock and reached to continue prepping him, baring his teeth, but Eijirou simply shoved him back and straddled his waist.
Katsuki's eyes blew wide in shock as Eijirou grabbed his cock and lined himself up, before forcing himself down on it. It burned and stung, but nowhere near as much as he'd been expecting, so he simply rolled his hips and sank down until the blond was fully sheathed, finally dropping forward to catch his breath with ragged pants.
“How the fuck-?!” Katsuki demanded as he stared down at where he was impaled on him, and Eijirou felt the blond's knot begin to swell almost alarmingly fast inside him. Clawed, slippery fingers grabbed his hips to keep him still and he felt Katsuki's cock jerk and twitch inside him for a long moment, before finally pulling out a little to slide back in deep.
Katsuki's knot caught on his rim and kept them locked together as his mate lifted him slightly, dug his heels into the carpet and began to piston up into him like a man possessed, head thrown back and teeth bared as he shamelessly chased his release. “Best mate. Good alpha. Taking my knot so well. Gonna fucking breed you.”
Eijirou moaned his encouragement, already beyond speech as he wrapped a clawed hand around his cock, fisting himself furiously as he leaned down to finally take his mate's lips in a bloody kiss.
Katsuki groaned into his mouth and thrust up into him impossibly faster, tongue warring with his as they fucked like desperate animals on the floor.
Eijirou felt the blond tense suddenly, and then he was swallowing a helpless moan of relief as the cock inside him pulsed and pumped him full of thick, seemingly endless warmth. He sat back quickly and ground his hips down, working his cock as he wrapped his other hand around his still huge knot and squeezed like Katsuki had before. Come burst from him and he vaguely felt his teeth cut into his bottom lip as his eyes rolled back in his head and every muscle in his body clamped down on bone before he fell forward, blacking out.
Eijirou became aware slowly, blinking blearily against darkness. His nose tickled and twitched and all he could smell was blood, Katsuki's skin and their intermingled come. His ass ached and it felt like there was still a cock inside him as he sat up.
There was. Katsuki's length slipped from him with a rush of come that soaked his thighs and Eijirou hissed in a sharp breath at the sensation. He heard a grumble and turned to see Katsuki blinking himself awake, lifting his head from the pillow. He must have somehow gotten them into bed after Eijirou blacked out. And then turned him around on his knot so they could wait it out more easily.
Good mate.
Best mate.
“You okay, Ei? Need to knot?” He asked with a yawn and rubbed at his eyes. He was obviously expecting Eijirou to still be lost to his instincts and was speaking simply for him.
Eijirou was aware enough now that he at least understood everything that was going on and what had happened.
He'd presented.
As an alpha apparently.
He didn't know how being an alpha was supposed to feel, but he wasn't sure he really felt like one.
But Katsuki had still recognised him as his fated mate.
Eijirou wanted to howl his excitement from the roof. His skin still prickled and stung and his gums and nail beds still ached, but it was nothing on what he'd felt earlier. He smiled.
“Need to piss.” He corrected and leaned in to press a kiss to Katsuki's lips. “Best mate. Thank you.”
“Still need to talk about what happened to you, Ei. I've never seen an alpha that looks like you did earlier, it was almost fucking terrifying. The hottest thing I've ever seen though.” He sat up and stretched, before reaching to flick the bedside lamp on, “call the doctors as soon as they open. I'll come with you. You'll need suppressants and shit before you do something stupid.”
Eijirou hissed at the light as it burned his eyes and climbed from the bed, cock hanging heavy and limp between his legs, knot finally deflated as he made his way to the door.
He didn't head to the bathroom though, he walked straight out the front door, completely naked, as the compelling urge to mark his territory pounded at the back of his skull.
Eijirou pissed all over the front step, in the flower beds and up the far fence before Katsuki came storming out in a pair of sweatpants with a look of frustration on his face. “Get back inside you fucking knothead!” He whisper-hissed, grabbing him by the bicep to pull him along as Eijirou tried to force out just a bit more piss to properly stake his claim on their little shared bungalow.
Katsuki half dragged him into the kitchen and flicked the light on with his elbow, “sit at the table, I’ll make you some tea.” He instructed as he opened an overhead cupboard and clicked the electric kettle to boil.
Eijirou did as he was told, content now his bladder was empty and his territory sufficiently marked for the moment. He watched his mate’s back muscles ripple as he grabbed a large mug and his valerian root tea, before he crossed to the fridge and took out a bottle of water, chugging half of it in one.
Was he not drinking the calming tea himself? He asked, a little confused and Katsuki snorted a short laugh, “I don't need it right now. I actually feel calmer than I have in years. I guess now we know why I was so crazy around you, flying off the handle and shit all the time. Had my dumbass fated around me constantly, dragging his heels presenting.”
“Sorry. Didn't think I was gonna present. Mom said I was alpha when my teeth grew in all sharp though.” Wow sentences were still pretty tough, that small explanation had taken so much of his brain power he kind of wanted to nap suddenly. Or eat. Or fuck.
Definitely fuck.
He rose from his chair the second the thought crossed his mind, palming at his cock as he prowled toward his mate.
“Sit back down Eijirou.” Katsuki didn't even turn around as he lifted the kettle to pour water into the mug and stir it. Eijirou whined, gums aching a little more. Could he smell that he wanted to mate again?
“Katsukiii…” he found himself groaning as he sat down and leaned against the hard wooden back of the chair, shamelessly fisting his already hard cock.
“Fuck. Dammit Ei, I'm trying to be a good mate. Let me…hnnn, fuck it-”
The next thing Eijirou knew the blond was slamming the cup of tea down on the table beside him, kicking off his sweats and dropping to straddle his lap. Then his mouth was full of hot, demanding tongue and Katsuki’s clawed fingers were digging into his scalp.
Eijirou rolled his hips, immediately deepening the kiss as he felt his skin begin to prickle and his claws and new canines grow. He pulled back to gasp in a ragged breath as he felt Katsuki shift and the head of his cock slide inside his tight warm hole, the way still slicked with come and lube from before they'd fallen asleep.
He felt even more teeth burst forth, until he was sure he had almost two full rows of canines over his already sharp teeth, baring them as he shoved his mate down until half of his cock was buried and he felt his knot begin to swell.
Katsuki's eyes blew wide as he stared down at him, hands suddenly braced on hard shoulders as his breath hitched at the stretch, “your fucking teeth…what kind of alpha are you- holy fuck how is your knot already that big?!” Rather than pulling away, Katsuki gritted his teeth and forced himself down, forehead thudding to Eijirou's collarbone as he panted through his discomfort and wiggled his hips.
He was too worried about trying to help and hurting his mate, so he sat stock still and bit the inside of his cheek until he tasted blood, the claws of one hand digging deep grooves into the table beside them.
Both of their legs were shaking by the time Eijirou felt Katsuki's hole clench around the base of his half swollen knot. He threw his head back to groan his pleasure and pride loudly at the ceiling, “so good. So strong. Good mate. Good Katsuki.” He pulled his claws from wood to wrap both arms around the panting blond in his lap and rubbed at his back, hoping to ease him but feeling himself scratching skin.
But Katsuki didn't stop him, he simply purred against his shoulder, tilting his face to nuzzle the underside of his jaw, before grunting in confusion and pulling back to sit upright.
“Where…?” He frowned and put a finger beneath Eijirou's chin to tilt it back. “...you only have one scent gland.” He stated, confused for a brief moment, before clearly deciding it didn't matter and shifting in his lap to lean in and rub his face against the one he did have without missing a beat.
Within minutes Katsuki was moaning and writhing in his lap, broken praises slurring against his neck as Eijirou wrapped his arms around him tightly and pistoned up into him like a jackhammer, knot fully expanded to barely give him space to thrust.
Eijirou wasn't even sure if the sounds coming out of his own mouth were words or not. All he knew, all he could focus on, was the heat enveloping his cock, the scent of his mate's desperate arousal and the sounds of their broken, ragged panting.
Eijirou heard Katsuki moan as he tensed suddenly, before his body spasmed and his inner walls milked his knot rhythmically as liquid heat spilled between their sweat slick stomachs to drip and run down Eijirou's hips either side as come pumped from his mate in amounts only an alpha could produce.
He hadn't touched his cock.
He'd made Katsuki come without touching his cock.
The edges of his vision winked black and fuzzy as he shoved a hand into the back of damp ashen silk and yanked his mate's lips to his, practically roaring into his almost slack mouth as his knot somehow expanded even more and come exploded from the tip of his cock.
Eijirou pulled back to breathe a long moment later, still gently rolling and rocking his hips as he came down and what felt like half a pint of come squished and shifted around his cock.
Katsuki's eyes were glassy and a little dazed but he was smiling as he licked his lips and tried to sit up properly. “Fucking hell Ei. If I was an omega I'd be carrying triplets already, even on birth control. Hnn, shit I don't think I can walk yet, don't move, my legs are shaking.” He flopped down heavily with a breathless laugh, face shoved into the juncture of neck and shoulder as he panted.
“No omega. Only mate my strong alpha.” Eijirou growled and lifted his right arm, sliding his wrist up and down Katsuki's back, not really registering what he was doing until a low rumbling purr started up and Katsuki murmured that he smelled good. He started, a little shocked as he looked down at his wrist to see another scent gland, just like everyone else had.
But Katsuki had said he only had one, didn't he?
This must be why his wrist, inner elbow and the underside of his jaw had been burning and stinging earlier. Wait, elbow?
He switched his attention to the crook of his elbow.
He… he had a scent gland there. No one he'd ever met with a second gender had one there.
“Katsuki. Elbow.” He grunted, frustrated that his brain and mouth still weren't on the same page. Even his thoughts, while they still made sense to him, were a little basic at the moment.
Dumb hormones.
“What's up, Ei? Hurt yourself?” Katsuki pushed himself up and hissed in a sharp breath as Eijirou's knot shifted inside him. He gently took his arm and frowned, lifting it as he bent his head to press his nose against the slightly puffy slit there. He groaned and flicked his tongue against it and Eijirou moaned, cock twitching as the blond pulled back, pupils blown. “That's a fucking scent gland, what the hell?”
By the time Katsuki had prodded at the gland free side of his neck and the wrist and crease of his elbow of his other arm, where he didn't have any scent glands, Eijirou's knot had gone down and they were sitting in a puddle of come as it dripped and ran between their legs to the chair and floor.
Katsuki pushed the lukewarm cup of calming tea into his hand and encouraged him to drink it all before padding from the room, a little wobbly on his feet. He came back in a few minutes later as the sound of water running rang from the bathroom, tapping away at his phone with a frown on his face as he muttered, “scent gland in elbow crease…” clearly taking to the internet for answers while they waited for the doctors to open.