AgathaHart
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PRIMAL; Urges (A Kiribaku a/b/o hybrid fic)
🕑 Added 2022-09-01 21:00:06 +0000 UTCFandom: My Hero Academia / Boku no Hero Academia
Ship(s): Kiribaku, mentioned past KiriMinaKamiSero, eventual Poly!Bakusquad
Rating: Explicit
Tags: masturbation, breeding kink, outdoor sex, intersexuality, alpha/omega, hybrid au, Omega!Bakugou, Alpha!Kirishima, Fennec Fox hybrid!Bakugou, Wolf hybrid!Kirishima
CW: mentioned non-con implication
*****
Katsuki and Kirishima lay together a long while before Katsuki had to pull away. The alpha’s touch still left a hot tingling under his skin. Without his arousal to distract him, it was too overwhelming. Kirishima didn’t seem to mind though. He stretched and groaned something about getting cleaned up.
They washed themselves in the creek. Both pretended not to notice that the other was focused mostly on cleaning their genitals. Still, when the alpha turned his back, Katsuki took the chance to covertly look him over. Standing up, it was even more apparent how big the wolfmen was, not just tall but thickly muscled with a healthy layer of fat. The black fur on his tail and ears was sleek and healthy. Clearly he could provide well for himself. These were all plusses as far as Katsuki was concerned.
Weirdly, the alpha’s hair was a wild shade of red. Judging by his black roots, it wasn’t his natural color. Katsuki didn’t have a clue why he would dye it. In his old clan there’d been some people who used an oil to treat their hair that left it with a green tint, but nothing like this. He wondered if it interfered with hunting. He’d stand out like a sore thumb when stalking through green brush.
Kirishima turned then and Katsuki got a brief glimpse of the flaccid but still pretty big dick that’d been inside of him earlier that day. He turned away quickly and pointedly focused on cleaning himself.
Kirishima must have finished. He scooted away from the water and sat on the bank. It took a lot longer for Katsuki to be satisfied that he was clean. The hair around his cunt was sloppy with half dried slick and semen. His thighs were so sticky he was surprised they hadn’t glued together already. Next time, he told himself, he’d get fucked next to a deeper body of water. That way, he could just climb in and rinse off instead of clumsily rubbing handfuls of cold water on his crotch.
Kirishima sat on the pebbly beach, quietly waiting for Katsuki to finish. Katsuki rewarded his patience by avoiding eye contact as he passed the alpha. He wasn’t embarrassed or anything so lame as that. It was just that this was the longest he’d spent time with another person since he’d left his clan. He felt acutely aware of how near and far the alpha was from him. When he sat on the same patch of earth where they’d laid earlier, he was sure Kirishima would plop down beside him. Instead, the alpha sat with enough space for a whole other person to sit between them, smiling almost shyly.
Katsuki lay back to avoid the alpha’s gaze and Kirishima mirrored him. They lay there, naked, letting the sun dry and warm them. Katsuki might have dozed off, but he was too busy thinking about… everything.
Arguably, having a mate was less of a disruption to his life than having a pup. And yet mating with Kirishima was more… not intimidating because Katsuki wasn’t scared of anything but… Caution-provoking. Yes. The thought of mating with Kirishima made him feel more cautious than the thought of getting bred.
“Katsuki?”
Katsuki bristled. “It’s Bakugou,” he snapped. Then immediately flushed. He glanced over at Kirishima. The alpha had a brow quirked, no doubt laughing at the contradiction: that he’d been inside Katsuki just a little while ago but calling him by his first name was too familiar.
“Or whatever,” he grumbled, looking away. “Call me whatever you want.”
“I’ll call you Bakugou!”
Katsuki looked back to see the alpha grinning cheekily. Normally he would’ve taken offense but he was distracted: All of Kirishima’s teeth were sharp. “What’d you want?”
“I was gonna ask what you were thinking about.”
Katsuki frowned. Letting the alpha know his inner thoughts was something else that felt too familiar. “I was thinking if you’re gonna be courting me you’d better prove yourself,” he fibbed. It was sort of true though. He’d feel better about mating if he knew the person he was mated to wasn’t a useless piece of shit.
“I will!” The alpha sat up like he was ready to go and prove himself right then.
Katsuki propped himself up on his elbows. “I need someone who can feed me when I’ve got triplets weighing me down.”
The alpha’s eyes widened, not fearful, but excited at the prospect of a proper litter. He visibly worked to stifle the giddiness and offered Katsuki a determined expression. “I can do that,” he said. “Plus I’ve got my pack–once we find them again–they’ll help too!”
Gross. That was a con in Katsuki’s opinion.
“They’re all alphas so you’d be the only bearer. Well, there’s Mina, but we’re pretty sure she can’t bear or it probably would’ve happened already.”
That… could be a pro or con. Either he’d have a group of alphas to protect and provide for him and his pups or he’d have a group of alphas that treated him like a damn baby-making slave.
He’d been quiet too long and Kirishima misunderstood: “Um, but it’s not like she’s my mate or anything! We just fool around–I mean we all do! Y’know it’s an all-alpha pack and has been for a while so we just mess around–usually just for ruts? Um, but I won’t mess around with them anymore. I mean, if that’s what you prefer! I don’t mind keeping things open, even you could um… y’know!”
Kirishima spoke so quickly it took Katsuki a minute to process and another minute to think it over. And there was a lot to think over. “For now,” he settled, “I want you to be mine and mine alone. Maybe…” He’d known people in his old clan who weren’t exclusive with their mate. For them, it was usually that they had feelings for multiple people. He couldn’t imagine that scenario for him but… “Listen, this is fucking crucial to me: I don’t just want a provider or a protector–I can do that shit myself. I want strong sires. If your packmates are as good a specimen of alpha as you are–” Kirishima blushed. “--then we’ll revisit this. Alright?”
Kirishima looked thoughtful for a long moment. He probably hadn’t considered siring as part of the equation and was feeling out his instincts, trying to decide if letting another alpha impregnate his mate was something he (and his inner alpha) could tolerate. The alphas in Katsuki’s old clan had been possessive as hell about their bearers having their babies, even the mated groups had only had one alpha with a group of bearers. But there were also extenuating circumstances there so he didn’t quite know what was normal.
“I think…” Kirishima said slowly. “That I want our pups to have the best chance of survival so… if you think one of my packmates would be a good sire then it’s fine with me. But only with my packmates.” He grit his teeth, grimacing at the very thought of Katsuki trying to breed with someone else. “I trust my pack to respect that you’re my mate and that your pups are my pups even if I didn’t actually sire them. I… I don’t think I could really trust outsiders with that.”
Katsuki nodded. He could respect that. “We have an agreement then.” He sat up and stretched, feeling muscles he’d rarely used before strain against the motion.
“Are you alright?” The alpha asked.
Katsuki tensed, then forced himself to relax. It wasn’t dangerous if this alpha knew he was physically weakened. Unless he was unreliable. But that’s what courting was for, wasn’t it?
“I’m kind of sore,” he said experimentally.
Kirishima looked guilty. “Can I get you anything? I know this one kind of bark that can ease pain if you chew on it for a while…” He looked around, like it would magically appear.
“... I’m hungry,” Katsuki said, feeling like it was a dangerous admission. But alphas bringing food was the most basic of all courting rituals for a reason. He’d meant it when he’d said he’d need someone who could feed him when he was weighed down with triplets. Time to see if Kirishima had meant it when he said he could provide.
“I’ll get you something!” Kirishima jumped up and started pulling on his clothes, tail wagging.
“Meat,” Katsuki ordered. “Go hunt something.” He rolled up to his feet, suppressing a groan as the muscles in his inner thigh strained.
“I’m on it!” Kirishima said. “I’ll be back before sundown, you just get a good fire going!”
Gross. Working the fires was such mom-and-pup work… But he guessed it made sense from a practical standpoint. Plus… it may not have been a part of courting rituals but he couldn't imagine he’d prove himself a decent mate and mother if he couldn’t do mom-and-pup work.
“I’ll make a fuckin’ fire like you wouldn’t believe!” He growled. “Just don’t come back with some puny squirrel!”
Big words considering Katsuki hardly ever hunted game larger than a rabbit. But he might be eating for two soon.
Kirishima hit his knuckles together in front of his chest. It was a weird gesture… probably something from his clan, but judging by the look on his face it was meant to show his determination. “I’ll definitely impress you, just you wait!”
***
Kirishima left him–going slowly down the creek, searching for prints and scents. Katsuki waited until he was well out of sight before taking a moment to properly examine himself.
From what little he could see of his cunt, he was a bit puffy and swollen, but not too badly. Mostly his muscles just felt sore. Luckily he still had a bit of medicine. He dug through his pack until he found the thick cream wrapped in a leafy envelope. It was painstaking to make so he was thankful it still smelled fresh. He spread some between his fingers to warm it, feeling a familiar sense of pride.
Like all the children in his old clan, he’d learned some skills with medicines and poisons under the clan’s eldest beta, Auntie Chiyo. When he’d presented, Chiyo had tried to talk his mother into letting him stay on with her at least half-time. She’d said he had a talent for it, pointing out how he’d figured out a new way to make their old medicines stronger. The hag refused of course, but he still allowed himself some smug satisfaction whenever he used his skills.
He smeared the medicine around his outer lips, his touch gentle, but impersonal. He was even more careful as he moved to his inner folds. He kept expecting to find a cut or tear, but he felt none.
Shortly after he’d presented, his Auntie Inko had gathered the bearers his age (all three of them) for a special lesson. Despite the fact she was far younger than Auntie Chiyo, Inko was the eldest omega in the clan, so it was her role to teach them how to be mothers. Eventually she would put them to work as her assistants as she guided the clan’s bearers through birthing, breastfeeding, and childrearing. Before that, however, she had to stammer her way through an explanation of courting, mating, and breeding. He remembered her explaining that they’d most likely tear their first time.
Katsuki’s mother, an alpha, had until then been quietly overseeing the lesson and suddenly snorted. “Not if your partner does a good job,” she’d said.
Inko had turned such a shade of red back then, now it was Katsuki’s turn to go pink. Did this mean Kirishima had done a good job? Katsuki remembered how he’d thought it was unneccessary for the alpha to finger him to climax before fucking him, but here he was with no injuries in delicate places.
His fingers met something slippery and warm and he started in surprise. Fuck. Just thinking about earlier was getting him wet? It felt really good though. His cock twitched at the memory. Shit.
He washed the excess medicine from his fingers and replaced the envelope in his bag. His dick didn’t falter though, only getting more full.
After he’d left his clan his heats had petered out and with them, his libido had slowed too. This was just fine with him. Any slick or seed he left behind could be used to track him. Not to mention, getting distracted like that could be dangerous. He’d thought being around a viable mate might make his cycle start up again. He hadn’t expected it to affect his urges in general. He definitely hadn’t expected it to affect him so fast.
He really didn’t have time for this though and he was exposed out here.
… But he could hide under the willow branches–that was how Kirishima had snuck up on him. If he kept quiet and out of the wind…
He crept under the curtain of leaves and immediately felt more secure. He wasn’t going to masturbate, he told himself as he sat back on his butt. He was just going to make sure he didn’t have any internal injuries. Yeah.
He slipped a finger inside, carefully feeling his inner walls. Maybe he took a little more time than was strictly necessary but he had to be thorough. He ignored his erection because this was a medical examination.
Shit, what if Kirishima came back? He’d said he’d howl to signal when he caught prey and again before his return journey. But if he forgot–
Maybe they could have a repeat of what happened earlier.
His cunt throbbed pleasantly and he pulled his hand away, breathing suddenly uneven. Fuck, what was he doing? Just because he’d found one alpha he was willing to have sex with didn’t mean he was safe from harm.
He scowled down at his traitorous hand and froze. His finger was shiny with slick, but also thin streaks of white. Kirishima’s seed. Because Kirishima had bred him earlier. His semen was still inside Katsuki’s cunt. Katsuki’s omega liked that. It liked it a lot.
He throbbed again and a moan slipped past his lips before he clapped his clean hand over his mouth. Fuck! He usually had fucking immaculate control over his omega, but giving in to it like he had with Kirishima had unleashed some kind of… horny flood! He snarled and snatched up his spear.
Fine, he could have one orgasm!
His inner omega cheered while he moodily rose up so he was kneeling. At least in this position he’d be able to get to his feet faster if a threat appeared. He didn’t start just yet though, first scenting the wind and twisting his long ears until he was absolutely certain there were no immediate threats in the area. Then, and only then, did he slip his free hand between his legs.
His wet finger had grown cool and he shivered at the cold touch to his insides. There was plenty of hot slick to heat him up though. And seed. Fuck. He bit off a moan and settled instead for a breathy gasp. He didn’t know why the thought filled him with such heat. He bit his lip and moved his finger, imagining that he was pushing Kirishima’s cum further inside.
‘C’mon,’ he silently urged his body, ‘get pregnant!’
Something snapped nearby and he froze, heart pounding and ears swiveling. There came a second, loud rustle and then a squirrel came flying down a nearby tree, closely pursued by another.
Fuck. He needed to hurry this up.
He looked down at the hand holding his spear, then to his cock, weighing the pros and cons. Finally he made his decision and, setting the spear within easy reach, took his length in hand. He needed to be quick.
‘Think sexy thoughts,’ he ordered his omega.
Usually this triggered images of the few alphas he’d been attracted to back in his clan. All two of them had been strong enough to meet his standards in a sire, but had been too old for them to consider him as a mate. But now his omega had new material based on memories and not just embarrassing teenage fantasies.
He thought of Kirishima’s fingers moving in him, how he’d licked and sucked Katsuki’s neck. When he’d teased Katsuki’s nipples and that first heavy press of his cockhead into Katsuki’s virgin hole.
His hips jerked and he stifled a groan. Repositioning the hand at his entrance, he thrust forward, humping both hands with his cunt and cock. Adding a second finger as he remembered how thick and satisfying Kirishima’s dick had felt inside of him.
His hips stuttered as he continued to thrust into his hands. “C’mon, c’mon,” he growled, half order, half plea.
His thoughts became as frantic as his motions. Mental images came and went in a flash.
Toshinori’s thick arms tensed as he showed them how to draw an arrow. Kirishima grinning, his mouth full of sharp teeth. Usagiyama crushing a melon between her thighs, the bulge of her clothed cock splattered with juices. Kirishima’s knot pressing against him. That faint whiff of post-rut he’d caught off Toshinori one time. Kirishima’s knot bursting inside him. Usagiyama hunting topless, tits as impressive as her abs and both glittering with sweat. Kirishima spurting inside him–filling him with seed–seed that was still there–going deeper and deeper–breeding him even when the alpha wasn’t here–
“Hah..!” Katsuki choked around a cry. He jerked, back arching as his cock spurted and his cunt clenched. He pressed his lips together to trap the sounds inside but couldn’t contain them completely: “Hmm! Mmmngh!”
His whole body shook with the force of his dual climax. “Hmmmfuck–”
His orgasm faded and he bent forward, plunging two fingers inside himself and pumping them quickly. Sometimes he could pull himself back and over the edge again–
“C’mon, c’mon–” He was definitely pleading this time. And his body blessedly responded. He gasped as he peaked, his whole body tense as he teetered, hand stuttering. And then he was falling over the edge again–harder than before.
He threw his head back, but made no sound as heat coiled outward from his belly, more slick spilling between his fingers. His orgasm wrung him out so tight he forgot to breathe and when he finally came down his ears were ringing.
Which was kinda bad–he needed those to work to keep him safe. He grabbed his spear with a cum-wet hand and tried to catch his breath.
When he came back to himself at last, he forced himself up on shaky legs. Kicking the dirt around, he buried as much of the sticky evidence as he could. The scent of freshly turned earth would work to mask the smell as well. His legs became surer as he worked. When he was satisfied he could no longer smell himself on the ground, he returned to the stream and washed away the rest of the evidence.
He set off in the opposite direction Kirishima had gone, sure that the alpha would be able to track him (he wouldn’t be a very good hunter if he couldn't). Katsuki had a mission: get firewood, supplies to make more medicine, and find a good campsite (preferably with a deeper body of water nearby). The location would need to be defensible and large enough for a fire big enough to cook whatever meal Kirishima brought him. And if it was good, he’d let the alpha try and breed him again.
… He was really hoping it was good.
