AgathaHart
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PRIMAL; First Tie (A Kiribaku a/b/o hybrid fic)
🕑 Added 2022-08-14 15:13:38 +0000 UTCFandom: My Hero Academia / Boku no Hero Academia
Ship(s): Kiribaku, mentioned past KiriMinaKamiSero, eventual Poly!Bakusquad
Rating: Explicit
Tags: 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
*****
Sharp teeth clamped down on Katsuki’s neck, pricking the skin in a warning. He froze, his chest heaving with exertion as he took stock of his situation.
He’d been doing well, as he always did in a fight, using his speed and small stature to his advantage, followed up with a strength that never failed to surprise idiot alphas who thought they could overpower him. This one hadn’t though. He’d taken Katsuki’s strength in stride and neutralized his speed by taking him to the ground and keeping him there.
Now here they were. The alpha wolf’s legs intertwined with his, their ankles locked together. His broad arms were strong as tree branches around Katsuki’s torso, hands clamped around his wrists, pinning his own hands (and the knives in them) against his chest where they could only hurt himself. The fennec fox tried once more to wrench his hands free, but the alpha held fast--his teeth clamped down harder and he growled.
Warm breath ghosted across Katsuki’s scent gland, reminding him of the strange fact: the alpha hadn’t bitten his gland. Was he mated already? Katsuki had been out in the wilderness for years and never crossed paths with a lone alpha that didn’t want to bite and mate him... And of course this was the one time he would’ve allowed it.
From a young age, Katsuki had decided that if he was going to carry pups, they would only be from the strongest of alphas--in other words: alphas strong enough to beat him. He had yet to meet one who could.
Until now.
The alpha slowly released his neck, huffing out a frustrated breath. “I just asked if your pack was around!”
Katsuki ignored him, too caught in his own head. He never thought he’d find an alpha that lived up to his expectations for a sire; it was taking a moment to come to terms with what might come next. He tried to break free once more. It was just another test, just to make sure the guy really was strong, but the wolf’s grip was hard as stone.
“I don’t want to hurt you.” The alpha was clearly going for an unthreatening tone, but it was undermined by the sheer exertion in his voice.
Well, at least it was a struggle for him, so Katsuki wouldn’t have to doubt his skills. He thrashed once more. This time, for fun.
“Stop trying to stab me! Please!”
“Well, since you said ‘please’,” Katsuki said through grit teeth.
The alpha let out a huff that tingled across his scent gland. “Well, it never hurts to be polite.”
Not true. To a lone omega in the wilderness, showing politeness to a strange alpha could be dangerous. Which was why when the alpha had come upon him and said, “Uh, hey there! Is your pack around?” Katsuki responded with blades instead of a smile.
His spear was lying somewhere in the brush. He’d have to get that later.
“That’s why I was asking about your pack,” the alpha said. “I’m kind of lost right now and I didn’t want to trespass through anyone’s territory.”
A perfectly valid reason. It’d been years since Katsuki lived in a clan with territory, but rogue alphas had been a concern. The weaker, sneaky ones might try to steal an omega. The really strong and vicious ones might try to kill a dominant alpha and take over their pack completely. It was better if an unknown alpha introduced himself as a guest and risked getting kicked out of the territory than to sneak around and maybe get killed by an alarmed pack.
Lone omegas like Katsuki had the exact opposite of this problem and his instincts urged him to hide his status as a loner. If the alpha knew he didn’t have a pack, he might see Katsuki as fair game and try to claim him… but this alpha had passed Katsuki’s one test. His one criteria. He couldn’t find a reason not to tell the truth.
“I’m on my own.”
“Oh, like a Journey?”
Katsuki scoffed. “My old clan didn’t let omegas go on Journeys.” No rights of passage to adulthood for him, he had to stay home where it was safe and wait for whichever of the Journeying alphas came back first. “I left.”
“Oh… Um, I guess I’m sorry? I really wanna let you up, but I don’t really trust you not to stab me… I get it though, it must’ve scared you to have a random alpha show up when you’re alone… so I’m sorry for that too.”
“Fuck your ‘sorries’. And I’m not scared of you,” Katsuki growled. Even when facing alphas who meant him harm, he wasn’t frightened. Either he won and was safe or… or he found himself in this position: he’d lost the fight, but gained a potential sire. Of course, usually the alphas were overly eager to mount him–it helped him to overpower them when they weren’t even aiming to fight. He’d never been in a position where he’d have to fucking ask an alpha to breed him.
“You beat me in a fight,” he said. “That’s never happened.”
“I believe you!” The alpha said, an amusing strain in his voice. “You’re really strong!”
“But–” Katsuki’s lip curled as he braced himself to say something he’d never said before: You’re stronger. He opened his mouth and froze. No. He couldn’t say that. The alpha had only beat him in one fight after all. “You’re just as strong.” Even that was a painful admission. “You got a mate?”
“Huh?” The alpha sounded baffled. Understandable given the whole ‘tried to stab him’ situation. “No?”
“Breed me then,” he said casually, though he felt anything but. Every inch of skin the alpha was touching grew warmer the longer it pressed against him.
“Wha–is this how alphas prove their worth in your tribe?!”
“It’s how alphas prove their worth to me ,” Katsuki growled. Just the thought of his old tribe left a bad taste in his mouth, but especially their criteria for what made an alpha worthy to fuck him.
“B-but… you said no one’s ever beaten you.”
“And?” He glared over his shoulder and watched the alpha red eyes go wide, his cheeks growing pink.
“So you’ve never…?”
“Not with anyone else.”
“O-oh…”
There was a long pause during which it occurred to Katsuki that after all this time, he might get rejected. The thought was outrageous. If Katsuki got turned down by the one alpha he approved of… After fighting off who-even-fucking-knew how many shitty alphas who didn’t make the cut? After all the knot-stains who’d waited until he was in heat because they thought they could pull one over on the poor, weak, lone omega (only to find he was extra vicious in heat)? If after all that, Katsuki got turned down by the one alpha he actually approved of, he was going to be pissed .
The arms that’d been holding him so tightly suddenly loosened. Katsuki could’ve easily broken away if he wanted. The weird tingling on his skin eased at the loosened grip and he let out a huff of breath. He was able to twist around more and look the alpha in his red eyes.
“Are you sure?” The alpha asked, his expression genuine and searching.
“I’ve been celibate my whole damn life over this, of course I’m fucking sure.” And he meant it. Sure, the thought of getting knocked up and having pups was kinda terrifying, but it was also fucking exciting . He broke the alpha’s hold on his wrists as he tossed his knives a short distance away.
Katsuki looked back to find the alpha watching him. “Breed me,” he ordered.
He’d never had sex before, but he decided right then that one thing he liked about it was watching the alpha’s pupils expand. A subtle, spiced musk drifted off him, growing stronger as he pulled Katsuki down against him. Their position hadn’t changed much from earlier, but now instead of grabbing his wrists, the wolf’s hands went lower, untying Katsuki’s cloth belt. His breath tickled Katsuki’s throat and he pressed his lips to soft flesh.
Katsuki jerked back. “No biting,” he said.
The alpha’s hands had paused at Katsuki’s movement, but then went back to work. “Understood,” he said, “no biting.”
The musky scent of the alpha’s arousal was enough to have Katsuki’s cock half hard. He fully expected the alpha to go straight for his pussy, but instead one of those big strong hands wrapped around his cock and stroke, surprisingly gentle.
“Wha–” he watched, transfixed as his dick swelled to its fullest. “Idiot! You don’t have to–” He was cut off as a soft grunt slipped from his lips. He was already feeling overwhelmed. It’d been too long since he’d been touched in any way other than fighting and the hot tingly feeling had returned when the wolf had pulled him down. “Don’t need to do that to get me pregnant.”
“I know,” the alpha sounded almost amused. “But I gotta get you loosened up first.”
“This isn’t gonna loosen up my cunt.”
“I mean, a good orgasm’ll loosen you up all over!”
Katsuki flushed. He’d been thinking about this as practically as possible, he hadn’t expected the alpha to want him to feel good. And it did–it felt so fucking good to have someone else do this.
“I might not have a mate, but I’ve rut-shared so I know what I’m doing.” He nuzzled Katsuki’s neck. “Let me take care of you.”
Normally Katsuki would bristle at such an order and say he could take care of himself. But… there was some appeal to letting the alpha serve him. Especially when it felt like this .
“I want to kiss your neck,” the alpha said. It took a moment for Katsuki to realize the statement was also a request for permission.
“Fuckin’ do it already.”
Immediately the alpha was pressing warm lips to his skin. Katsuki made a soft sound at the sensation. Each press of his lips felt so tender and yet so intense. When he pulled back the skin tingled with a phantom sensation.
The friction on his cock grew smoother as the wolf smeared pre-come down the shaft. The alpha’s other hand rummaged around behind him, the hand on his cock slowing as the alpha shuffled to remove his loincloth. As soon as the fabric was gone between them, he pressed his pelvis against Katsuki’s backside. Katsuki flushed to feel something hot, hard, and huge press against the cleft of his ass.
The alpha kept his hands busy–while one continued to stroke him off the other slipped past, between his legs, teasing the fat lips of his cunt. Fingertips lingered, trailing through slick-wet curls.
“You still alright?”
“Fuck,” Katsuki growled. “Yes.”
A finger slid inside him and he gasped. Not because it hurt. It didn’t. It felt like a perfect fit. No, he gasped because he’d never had anyone inside him before and the thought had his inner omega howling and slick oozing out of him. The finger began moving in time with the hand on his cock, a dual sensation to both his sexes that had him swearing, forehead pressed to the ground.
He’d come from his dick soon. His cunt may or may not follow along, he couldn’t tell with the pinching heat in his belly. The alpha added a second finger to the one wriggling inside him and he let out a choked noise, his leg jerking in surprise. The stretch at his entrance burned a little, but he could feel it more inside, his cock jumped at the sensation.
“I-I’m close,” he growled, too swept up to feel embarrassed at how quick he’d come to the edge.
The alpha grunted, panting against his neck. The hand on his cock continued as the fingers inside Katsuki pushed in far and began rubbing at the place that he knew could pull him to orgasm–and that’s just what it did.
Slick spurted across the wolf’s fingers just Katsuki’s cock spilled onto his hand. Katsuki howled in a way he’d never let himself do when he was alone. His body shook as the dual orgasm rippled through him, the alpha gently stroking both sexes as he came down from his climax.
Of course, the beauty of having a vagina meant that even though his cock had gone soft, he was still ready for another round. In fact, he was more than ready.
“Fucking get inside me,” Katsuki growled.
The alpha actually laughed. He shifted Katsuki’s leg, slotting himself between Katsuki’s thighs. Katsuki felt the alien, but thrilling press of a cockhead at his entrance. “You’re something else,” the alpha said.
“Hah?”
“Something incredible,” the alpha clarified, letting out a soft sound as he pushed in.
Katsuki choked out a gasp. The cock was much bigger and longer than his fingers.
The alpha hissed as he pressed in. The hand not holding Katsuki’s leg up snaked its way around his chest. “Y-you still good?”
“Don’t stop!” He snarled through grit teeth.
The alpha huffed and grasped at his hips. Using them as leverage, he started a slow, steady pace that was just enough and not enough at the same time.
The wolf’s hands were so big–his fingers nearly met in the middle of Katsuki’s waist. His omega yowled approval. Normally, he’d squash it down and take offense. How dare this asshole be bigger than him! But this big asshole had a big cock and was about to give him some big, strong pups so he let his inner omega make all the noises it wanted. Also him too. He was making a lot of noises.
Katsuki felt overwhelmed, every touch was so hot and the heat lingered like a burn long after touch had moved. He opened eyes he didn’t remember closing, trying to ground himself as the heat in his belly rippled through him.
He and the alpha had wrestled their way under the branches of a willow tree, the leaves providing a veil of privacy between them and the rest of the forest. They fucked on the ground like the half-beasts they were and each movement was met with an echoing rustle of earth and fallen leaves. The air was quiet but for the chatter of birds and their increasingly loud coupling.
“Shit… your stomach…”
Katsuki looked down and for a delirious moment thought ‘holy shit, I’m already pregnant?’ before he beat back his sex-addled inner omega and realized what he was looking at: there was a slight bulge in his belly. From the alpha’s cock. He was so big, his cock was making Katsuki’s stomach stick out. It wasn’t a lot, but it was decidedly there .
“Does that hurt?” The alpha rasped. His hips slowed and the weird, exciting bulge went away.
“No,” Katsuki said, which was the truth, but he said it so fast it sounded like a lie. He wanted that little bump back though and clumsily thrust backward onto the alpha’s cock. “Keep going!”
“You’re in charge,” the alpha complied, pressing a searing kiss to his neck.
Katsuki moaned as the wolf started moving again. He watched, transfixed, as the alpha’s cock pumped in and out of his body, ignoring the way he was fucking leaking slick.
The alpha’s nose pressed against his scent gland and Katsuki let out a whine that shocked him. “Don’t bite!” He tried to say it as a command, but it came out pleading.
“Won’t–” the alpha grunted, hips stuttering as his breath hitched. “I wanna–can I lick it?”
The gland felt tight and sensitive. He didn’t want a mating bite, but maybe some licking could alleviate the pressure. “Yes, fuck! Yes!”
One press of the flat of the alpha’s tongue was more than enough to alleviate the pressure. A burst of pleasurable tingles shot up the back of his neck and he arched, hovering on the edge of his orgasm. He pressed a hand to his stomach, feeling the alpha pushing into him from inside and out. The wolf must’ve been able to feel him too. He jerked and snarled, tightening his grip. His hips slammed purposefully into Katsuki’s.
Oh fuck, he was going to knot him. Katsuki’s omega was howling a chorus of ‘yes, yes, yes!’
The alpha thrust against him again, hard enough to push Katsuki forward and make his cunt flutter, so ready to cum. The alpha pulled back to push in again. Katsuki braced himself against the ground. He pushed back as the alpha bore down on him. There was a tight, breathtaking pain-pleasure-pressure as his cunt gave way. And then it was in and it was so big and he was so full. He could feel it through the hand on his belly as the alpha poured into him. Katsuki cried out as he clenched down, shaking apart as he finally cleared the edge and came around the alpha’s knot.
The wolf pressed down on his scent gland, not biting, but sucking hard, sending out ripples of pleasant tingles that had him shuddering until the last of his orgasm had faded.
They lay there for a long moment, simply catching their breath.
The alpha lazily laved his tongue over Katsuki’s scent gland and he–well, he actually turned his head and let him. He’d never let himself be so vulnerable with an alpha since before he presented but… he kind of liked it. This was a wet, rhythmic heat of a different sort and it stoked an equally different involuntary reaction in him: he started purring. Before he could even start to feel embarrassed, the alpha’s chest nearly vibrated behind him, his own purr loud and close.
Fuck, Katsuki could feel the rumble in the alpha’s knot. He gasped at the subtle sensation on his over-sensitive cunt. Either feeling Katsuki clench around him, or tasting the flicker of arousal from his gland, the alpha reacted, reaching down between Katsuki’s legs, past his spent cock, arriving at his entrance. He stroked Katsuki’s lower lips, where the tender, wet skin still clenched around his knot.
Katsuki shuddered, sensitive. “What are you doing?” He rasped.
“I want you to cum again,” the alpha said simply.
“Fuck,” Katsuki squirmed as the tender touch at his cunt sent prickles of pleasure-pain tingling up his spine.
Like he could fucking read Katsuki’s mind, the alpha pulled back, focusing on Katsuki’s less sensitive but still very wet outer lips. His hand then left entirely, coming up to instead grab at Katsuki’s chest.
“Fuck, your tits are incredible,” the alpha groaned.
Katsuki smirked lazily. He didn’t quite have the plump breasts of a female omega, but he had enough for the alpha to cup and squeeze. Slip-damp fingers teased his nipples.
Katsuki didn’t usually play with his chest much. He had when he was first learning how to get himself off, but once he got the hang of it, it seemed unnecessary. This was nice though. Really nice.
The alpha latched onto his neck and sucked. Wet fingers tugged and pinched at his nipples until they hardened into bright pink nibs. Katsuki moaned and felt heat pooling in his groin. He probably couldn’t cum from this though.
Or at least he thought so. The longer the alpha kept at it, the more he started to doubt this. Soon Katsuki was gasping, his cunt clenching around the alpha’s knot while his breasts began to ache, his nipples harder than they’d ever been.
“That’s it,” the alpha’s voice rumbled through his purr. “Let me take care of you, come on.”
His words stoked something primal in Katsuki that his spent cock swelling once more.
“You want me to touch your dick?” The alpha asked, half command, half question. “Or should I keep playing with your breasts?” He gave them both a meaningful squeeze, pulling down to Katsuki’s nipples and pinching hard enough to make the omega fucking mewl .
“Nnngh!” By way of response, Katsuki reached a clumsy hand down between his legs and grabbed his half-hard member. His hips gave an involuntary jerk and both of them groaned at the tug between them. “Don’t stop,” he ground out between grit teeth.
The alpha dragged a teasing over his gland and continued as he’d been: licking and sucking along Katsuki’s neck and teasing his stiff nipples. Katsuki’s hand moved erratically over his dick.
Fuck, he was already so close again–was it because of the way the alpha was pinching his aching tits? Or perhaps because every jerk of his hips sent an aching, vibrating reminder of the cock stuff inside him? Fuck, it could even be because the alpha’s uneven breathing ghosted across his kiss-wet neck, sending pleasant cool tingles across his skin.
Regardless of the why, it was nearly embarrassingly soon when Katsuki’s back was arching, pussy squeezing the knot inside him. “Yes! Yes! Yessss!” He cried out as he shot another load, whining as the alpha pinched his sore nipples through his third orgasm.
“F-fuck!” The alpha groaned in his ear, one hand coming down to clutch Katsuki’s hip. He shuddered violently.
Realizing the alpha was cumming again, when he was not even fucking moving made Katsuki’s orgasm do a clumsy but delightfully welcome little encore and he cried out again, shaking apart as he imagined more of his partner’s seed spilling into him.
They took a moment to catch their breath and then the alpha was asking: “Did you want one more?”
“Fuck!” Katsuki let out a huff of a laugh. “I’m–I’m fucking good ,” he panted. “You’re thorough as fuck.”
The alpha let out a soft laugh. “Thank you?”
“Kinda feel like I should thank you…” Katsuki grumbled before he realized he’d spoken out loud. The alpha chuckled again and pressed a kiss to Katsuki’s jaw then, after a moment’s hesitation, he lay his head down. They were neck-to-neck now. Their scents would mingle. Katsuki would reek of the alpha for days… he found he didn’t quite mind the idea.
They lay there a long while, coming back together. Katsuki had heard that omegas often went ‘limp’ or got lethargic after being knotted and had always written it off. Of course they got ‘lethargic’ after mating–why would they want to move with a big dumb alpha attached to them? But now he kinda got it. He felt like he did after he’d washed himself of the grime of a long hard day, then laid out in the sun, bone-weary but comfortably warm. He felt so relaxed, he almost fucking dozed off. He came to when the alpha gently tapped his hip.
“I’m gonna try and pull out–you ready?”
No. He was very comfortable actually, but they couldn’t lie there all day. He shifted, spreading his legs to make it easier. The knot did feel smaller now, but it was still quite a strong tug when the alpha pulled out. The sound it made was obscene, but Katsuki barely noticed as he was struck by an emptiness. They both gasped as his cunt clenched down on the head of the alpha’s cock. The alpha let out a shaky breath as he pulled out the rest of the way. Katsuki felt similarly shaken, his entrance clenching down on nothing, sending pleasant tingles through him even as he mourned the loss.
Warm wetness trickled down his leg. He drank in the sight of the alpha’s sloppy wet cock draped across his thigh. All the slick that’d been plugged up inside him was now oozing down across his legs, clear and sticky and mingled with streaks of white. He frowned. Some of that white shit better have stayed inside.
The alpha was gently stroking his hip. “I want to court you properly,” he said.
Katsuki was too sated to react with his usual bluster. Instead, he turned and offered a single raised brow. The alpha met his gaze with an earnest expression.
“Sorry, I know we’ve gone a little out of order but… well, I… I don’t think I’m a ‘breed and leave’ kind of alpha, y’know? I want to look after my pups and my mate.” He looked Katsuki in the eye. “Please let me to court you.”
Part of Katsuki wanted to say ‘hell, the fuck no’. This asshole probably had a pack and Katsuki hated packs. But on the other hand, his heats had become few and far between since he left his clan–his body adjusting to the lack of alphas–which meant he very likely wouldn’t get pregnant from this one coupling. And who knew when or even if he’d find another alpha that met his standards? Plus whenever he did get pregnant… Well, he was strong and perfectly capable of providing for himself usually , but what about when he was huge, heavy with pups? Or when he had a helpless infant (or infants ) that screamed and stank for every predator to hear and smell? He could care for himself by himself, but when he was no longer alone… back-up would be convenient.
Plus… it turned out sex felt pretty fucking great.
“Alright,” he said, trying to sound like he was relenting and not like he was ready to get fucked again. “First things first though: what’s your fucking name?”
“Oh! It’s Kirishima Eijirou! What’s yours?”
“Bakugou Katsuki.”
Eijirou grinned, showing off a line of sharp teeth. He leaned in close and gave Katsuki’s scent gland a playful lick. “I’m excited to court you, Bakugou Katsuki.”
Fuck. He couldn’t believe it, but he was excited too.
