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Kakashi doesn’t glower at Tsunade, no matter how much he wants to.
She doesn’t seem to appreciate his self-restraint.
“Don’t give me that shit. You’re thirty-five, your last rut was ten years ago, and you’ve been on S-grade suppressors for longer than that. You are due.” Her amber eyes are cold and unforgiving. She’s not even pretending to understand his perspective.
If only he could be genderless. It would be so much easier. But no, he’s a male, he’s got a cock, he’s an alpha, he’s got an alpha cock, and all of that together meant he was forced to go out of his mind in lust once every few years. There was nothing worse to his senses, an overwhelming need to fuck, to bite and mate and knot in such a way that he populates some poor omega’s womb with his spawn. Few could withstand his grade of risk level, let alone finding someone he didn’t immediately want to smother for daring to see his face or witness him at his most vulnerable.
He’s managed to avoid it for so long, he almost thought he could get away with it.
A bottle of hydration pills are pressed into his hand, as is his pre-filled-out leave request.
“I’m Hokage, why do I have to get a leave request approved. Who even approves it.” He mutters, a mite spitefully.
“Me, brat.” And Tsunade returns his glare with a raised eyebrow, holding her hand out to the door in a flippant dismissal, and he’s never abused his position, never would, but damn she made it hard sometimes.
“I can’t prescribe it,” She says as he strides to the door. He doesn’t want to hear it, don’t put it to words— “But as your doctor I highly, highly recommend you find a partner, preferably in heat and a certain rank of ninja. Something like this can go wrong, Kakashi, and it can kill you.”
“Thank you for your advice.” Kakashi eye smiles at her, though he knows the face beneath his mask is dispassionate. Maybe even annoyed.
And he poofs away this time, the canister creaking under his fist.
Rut. Fucking rut.
He hates the very thought of it. A goddamn remnant of a time long gone, and here he is, unable to avoid thinking with his knot for a few days (maybe even a week, he had seen his test results too, he was rather overdue). Wanting to fuck. Needing to. He’s never wanted to, never really needed to otherwise, far to engrossed in his own grief or Team seven or Anbu missions.
Who can even match him? A partner? Hah. He’s a goddamn Hokage, the only ones who could handle his monstrous rut self is another monster, another Kage-level shinobi, one who he trusted and wouldn’t mind being touched by, let alone touching with his own two hands. And really, how many of those are there?
Tsunade?! No. Everyone else was dead. Dead and…gone….
And then he sees ahead in the street a shining head of golden blonde hair, hears a warm, beautiful laugh, and hesitates just long enough that ocean blue eyes catch sight of him and light up.
He won’t admit it, ever, but Kakashi loved how much Naruto liked him. Genuinely seemed to just like him, for no reason. He knows as sensei he exists in a special role in Naruto’s life, taught him a few things here and there, but Naruto was open and loving and ready to talk to him, seeks him out whenever they’re in the village. Naruto, his sensei’s son, grown into adulthood under the village’s eyes and fought for an won all their admiration and love.
The fact that he was an omega never held Naruto back. Not even when heat interrupted his missions or sent him into seclusion.
Kakashi will not admit to hovering about the blonde’s apartment that week, scenting the building’s edges, lurking on the roof, scaring off curious individuals with a sharp snap of teeth and glowing eyes in the dark.
“Sensei!” Naruto calls, arm waving widely. He abandons his current friend (Hinata-chan, it was the young Hinata-chan, in love with Naruto but accepting of the fact Naruto was waiting for his alpha partner and she, as beta, could not fulfil that role) and trots up to Kakashi with his scent hanging about him like a happy, sweet cloud.
“Naruto.” Kakashi sighs, but it’s not as carefree or bland as he normally would be. Behind the blonde, Hinata gives Kakashi a secretive smile and melts into the crowd. Kakashi focuses himself, breathing exercises, chakra control. Just because he can smell peaches and caramel, doesn’t mean he needs to react to it. Just because Naruto’s trotted up to him, happy to see him, doesn’t mean he needs to wag his fucking tail in response.
But, to Kakashi’s eternal horror, Naruto’s head is cocked to the side and his eyes are narrowed. He’s reading the words on Kakashi’s pill canister. Oh no. No, no, no.
“…rut…aid?” Naruto says lowly, brows furrowing. Oh, please Kakashi thinks with wide eyes and his entire soul frozen, please be too dumb to understand. But blue eyes fly open wide, shocked, blinking up at Kakashi and---
“You’re an alpha!” Naruto announces to the public street as though this fact was new and bright and shiny and everyone should know it. Naruto hadn’t known? He’s looking now at him with new eyes, with eyes who just learned something new and shiny and important.
Kakashi is gone in an instant, barely a cloud of dust in his wake.
Naruto, of course, follows because he still doesn’t understand some social cues. Kakashi’s radiating fuck-off vibes hadn’t yet bled into his scent pheromones, so Naruto could ignore the stiff body language and dark narrow eyes just fine.
Honestly, Kakashi thinks the boy wouldn’t get it unless he did something overtly alpha – snarling, mantling, bristle like a great dog under threat, maybe even pin him down so Kakashi could physically dominate--- Naruto always understood the beast better than immaculate etiquette.
“It’s okay Kakashi-sensei!” Naruto cries, darting up this side. Kakashi notices he’s not wearing the standard scent patch today, perhaps he was off duty. His cloud of cloying sweetness and fruit envelopes him. “I won’t tell anyone you’re on rut, everyone has to have it right? Who’s taking the hat while you’re gone? Do you need anything?”
Kakashi deliberately remains silent, leaping off towards his apartment and expecting Naruto to fall back and leave him alone.
Instead, Naruto keeps pace because of course he does.
“Kiba was in rut a few weeks ago, he asked me if I could partner him cause Shino was on a mission.” Naruto says baldly, and merely blinks when Kakashi misses his next jump.
“What?” Kakashi hisses, clinging like a cat to the side of the wall. If he presses any harder, this poor family will have Kakashi’s fingerprints indented into their plaster.
A red-hot white rage fills him for a terrifying instant. Naruto, the all-powerful Savior, the partner to Kurama and Kakashi’s successor in just a few years, and an omega. Who could just ask him to partner a rut? Who would have the balls?! Certainly not a runt like Inuzuka Kiba.
“Yeah?” Naruto gives him a face like Kakashi’s pissed in his cereal. “It’s just Kiba. I said no, cause I probably wouldn’t partner for anyone except Team Seven, ya know? Not that Sakura-chan would ever, and Sasuke has that gland problem.” He whispers the last and glances around furtively, remembering the last time he’d mentioned said problem aloud. If he didn’t heal so well, Sasuke would have relieved him of multiple fingers that day.
Only Team Seven.
Ah. Okay. Okay, Kakashi, chill.
“Who’s partnering you then, Sensei?” Naruto asks, waiting patiently for Kakashi to crawl his way ignobly back to the rooftop. He’s realizing now that his rut behaviors had really started causing havoc, he’s almost glad to take the leave. Kakashi doesn’t know what would happen if something like this had come up in the Hokage tower, where his shinobi force and his advisors were all present and watching all the damn time.
But Naruto asked a question. Who’s partnering you, sensei? Blonde hair that’s just long enough to fist, pink lips that would open and pant and get wet by a questing tongue, and blue eyes that would haze, staring up at him adoringly, rolling with every thrust---
Kakashi puffs into smoke and leaves Naruto to cough in it’s excess.
Home, home, home, den, den, den safe, nest.
Safe, he’s safe.
He activates his security seals, almost frantic, tearing at his jacket, his mask just to gasp into the empty open air, shocked by his own body’s responses.
He’d only been taken off suppressors last night, how was he falling into rut already? What had it been? What triggered it? He understands it might be stronger due to the delay, but holy fucking hell—
The sweet smell of wet peaches, caramelized. Braying laughter in a voice so full it would deafen him shouting in pleasure. Blue eyes. Blonde hair.
Absolutely not.
He would not fall into rut after smelling an appetizing omega, he would not, he’s not a green teenage brat of an alpha. Kakashi was Kage-level, he’s had iron control over himself for all his bloody life, he would not allow his body to lust disgustingly after his omega student, his much younger, much purer omega student.
And yet his body didn’t seem to care, stripping himself quickly until its just him pressed against the inside of his bedroom door, cock fisted in his hands with one at the base tight around the thick skin that would eventually bloom into his knot.
Fuck!
“Fuck,” Kakashi hisses through clenched teeth, eyes tightly shut. Madness flirts at the edges of his consciousness. His hips are pumping already, working to find a hole despite being alone in his den, having refused the beautiful omega right there that had asked.
It had been an opportunity. That’s all, that’s all his body was latching onto. Naruto had asked, curious, polite, probably expecting a random answer of an old Anbu comrade or a hidden fuck buddy.
“I don’t have one,” Kakashi could have said, alpha standing tall and looking down the four inches to Naruto’s eyes. He could have leaned in and let his scent waft, trailed the back of his fingers down those whiskered cheeks and crowding close to smother him in alpha scent. “I don’t have a partner, but you could help me out, couldn’t you Naruto? Help out your old teacher?”
Kakashi gasps in air as his feet become unstable, hips thrusting up into his own grip, imagining, what would Naruto taste like?
Kakashi comes at the same moment his window blows open, then shuts. Oh no.
Back arching, he really can’t focus, eyes squeezing shut, teeth grown huge and menacing in his mouth and his knot swells even without a clutch, shooting out come up his abdomen, onto the floor, dribbling down his thighs. Fragrant and sticky and gross, the alpha in him is beyond pleased at the scent marking. What’s better is the little gasp he hears.
“Sensei.” Naruto’s voice isn’t suave, it isn’t seductive, it’s a little shocked and awed and a bit confused but ready to fucking learn.
Kakashi doesn’t open his eyes. Naruto’s in his den. Omega is in his den.
“Get out.” He bites through his teeth, clenching his jaw so hard it hurts, just so his nose doesn’t focus on that wet, wet beautiful smell, just so he doesn’t do what every inch of his body wants to do, which is leap atop Naruto and bear him to the floor.
(he’s probably so loud, so willing, crying out, sweating, gorgeous, opening up for Kakashi, for him, for alpha--)
“Sensei, it’s okay.” Naruto rustles, moving though his feet don’t approach. A new smell invades Kakashi’s home, new and strange and something he’s smelled before only through layer and layers of clothes and walls and seals. “Kakashi. I…I would partner for Team Seven, anytime, but they can’t, and you can, and I want to. I want to help and I….”
Kakashi’s eyes open and he gets to watch Naruto pull his fingers out from his pants, part them so Kakashi can see the sticky slickness dripping from them, stretching between his fingers. Slick. Heat. Naruto’s in heat. His cheeks are flushed red, his bottom lip is bitten, and his eyes are darting between Kakashi’s bared face and his exposed, still hungry cock.
“You what.” Kakashi’s voice is almost unrecognizable. It’s rough, and mean, and dark and it’s alpha speaking, that’s alpha talking, listen bitch.
Naruto whimpers, legs shuffling, knees probably trembling. There’s a dampness of sweat to his brow, headband-less, and Kakashi’s realizing that the other has slowly taken off clothes here, like he’s just getting too hot, stripping in Kakashi’s den like it’s his own.
“I want your help with my heat, I’ve turned down everyone and I couldn’t figure out why, not until you did your thing with your hand last week and touched my neck and I wanted you to choke it and hold me down.” Naruto’s brave, so brave. Telling this to Kakashi straight on, Kakashi who’s rut is swirling into his brain, taking over his motor controls.
He had done that last week, hadn’t he? Jealous bastard that he was. Naruto had been laughing with a paper pushing chuunin, scratching his whiskered cheek with an embarrassed pinkness to it, and Kakashi had swooped by, snatched his omega by the back of his neck and walked off with him. He was Kage, he hadn’t needed to intimidate that chuunin, but he had anyways.
Huh. Maybe rut had been incoming for a while now.
“Even if it’s just your rut, I know what its going to be like, I know you might come out of it and want to talk like adults--” Naruto says this with a certain kind of disgust and it’s so familiar the parts of Kakashi that were still rational laugh at him, “—but right now I need you.”
I need you.
He needs me.
A thunk of skull hitting wood, hands gripping so tight into whatever clothing is left that the seams creak and Kakashi’s got Naruto pinned against the far wall. With his cock hanging out his pants, head drifting low and slow, and Naruto is letting his eyes roll back, letting his omega take over and oh yes.
His mouth over Naruto’s gland. He won’t bite. That hasn’t been offered yet. But he can lick, and lick, and lick, until Naruto is squirming against him and whimpering and making all these little movements and noises just for Kakashi.
I’ve turned down everyone.
“Who else?” Kakashi rasps, panting, clawing at Naruto’s shirt until it either gives in or slips off because then he can touch skin. “Who else has tried to touch you?”
“Wha—” Naruto’s eyes are hazy, but his mouth drops open obediently when Kakashi crawls his lips and tongue up to kiss him. their first kiss. It’s hot and slow and determined, and Naruto’s hands cling to the back of Kakashi’s neck. “What?” He grunts at a forceful thrust of Kakashi’s cock against his hipbone.
Alpha was eager.
“You’ve turned them down, who fucking tried—” Kakashi snarls this time, unreasonably angry, rut turning his rage and hatred into something frightening and primal. He’s yanking, stripping Naruto of his pants yet going back for his mouth over and over, unwilling to lose ground on either front.
The smell of slick and wet peaches is going to his head, he feels fuzzy and lost and yet strong, dangerous in a way he rarely does, not even in battle.
“That doesn’t matter,” Naruto is laughing, grinning, helping Kakashi strip him and yanking at Kakashi’s own few layers until they’re both naked and Kakashi is bullying his way between Naruto’s legs, the both of them precariously pressed against the wall and likely to stay there.
A bed doesn’t even cross their minds.
“Yes, it does.” Kakashi grunts, sealing himself over Naruto’s gland again and sucking, scarping his teeth in a way that was both threatening and claiming. He won’t bite. He’s a respectful alpha. But he’s also an alpha in his first rut of a decade, and Naruto’s legs are trying to spread about his hips and there’s a beautiful, wet, throbbing cunt right there for Kakashi to taste and by all the fucking Kami in the sky he’s going to.
He falls to his knees right there, ignoring the familiar painful pop, and delves in without even asking. If this is his one chance to have Naruto, because rut and heat leave them to their senses, he’s going to have everything.
The first swipe of his tongue sends Naruto squealing, and when he mouths at that pussy like it’s kissing him back, Naruto’s feet leave the ground. Kakashi’s pressing him fully into the wall, perched on his shoulders and his arms and he feels strong enough to do this for fucking days and---
“Kakashi!” Naruto screams, shivering, into an orgasm because Kakashi hasn’t made this a slow and steady incline. No, as he feasts, Kakashi licks his way inside, sets his mouth within the thick lips of Naruto’s cunt, and shakes his head vigorously, like a dog.
Naruto shrills a few times, legs jerking, slipping down the wall and yeah. Alpha made his omega come hard.
Letting Naruto collapse into his lap, pinned between Kakashi’s kneeling form and the wall, the alpha surveys him for a moment, pleased. Pulling Naruto so he sat over his thighs, legs spread, and Kakashi sitting on his heels, he can let his cock fall heavy over Naruto’s seam and over his mound. The head of it rests, leaking, on golden skin and Naruto blinks his way back into consciousness only to lick his lips at the sight. He reaches for it.
“Naruto.” Kakashi says, impressively coherent. It’s tough, a bark more than a word. “Be sure.” There, that’s good enough of a warning. His scent clouds out around them, marked on Naruto’s skin through spit and scratches but Kakashi wants a new scent, a deep, implanted scent in this beautiful, golden-haired cunt that twitches in reactive shock to such a quick savage orgasm.
“Kakashi-” Naruto purrs, eyes lidded, cheeks pink, his own scent billowing strongly. Heat, rut, whatever. It all flies out the window when Naruto finishes, “-sensei.” Teasing, toying, pressing buttons like only he knows how to do and Kakashi’s will to resist breaks.
He's on his feet, omega in hand in an instant, eyes sharp as they ensure the apartment is secure. Den is safe. Kakashi noticed that Naruto hadn’t actually answered his question. He probably had the entire village as competition. He had to secure them properly. Nobody could get through his defenses; nobody could smell him or Naruto.
Well, nobody could get in save a very determined seal-using omega but that’s all.
Naruto’s mouth drags on Kakashi’s own gland, which hasn’t been touched by another person for probably more than two decades. It makes him shiver, almost stumble, but then Naruto’s in his bed, in his blankets and sheets, legs spread, pussy red hot and waiting, and Kakashi’s rut brain has no other choice.
He puts his cock in without a single second of pause.
Naruto’s neck strains when his head tips back, mouth falling open in shock. Kakashi dimly understands, distantly pets at Naruto’s throat, his chest, over his pink nipples. It did feel very, very good.
Thumbing at a wet clit, Kakashi grins savagely when Naruto spasms, legs, arms, pussy, all of him flailing and reaching for him.
“Kaka-shi, Ka--, please, oh god you’re huge what the fuu—” Kakashi smears those words back into Naruto’s mouth with a few fingers and then his tongue.
“Perfect pussy,” Kakashi mutters, dark, heavy. Hanging his tongue, he lets his saliva gather and slip down it, directed into Naruto’s own mouth. The omega whines again, cunt twitching in a tight, tight hold, and Kakashi growls.
“Take it.” He says, drawing his hips back and then fucking them forward, perhaps too hard, perhaps without a drop of mercy and he would feel bad. He would, if Naruto hadn’t grinned madly in response, eyes rolling back in pleasure and his thighs falling open to encourage Kakashi in deeper.
“Make me take it,” Naruto throws at him, challenges him, and Kakashi’s too alpha right now to allow him the leisure to think he’s in fucking charge.
He surges, and then he’s fucking, and Naruto can do nothing but clutch back, cunt hot and open and filled.
He’s loud. Kakashi knew he would be. Scream, omega.
With his hand around the back of Naruto’s neck, he can hold him down to receive his thrusts, he can duck down to kiss him, or lick his cheek, as he likes, he can let his other hand travel and touch him, feeling from mouth to chest to belly where he fucks within to open thigh.
Blue eyes. They’re so much. Looking t blue eyes, locked on his though they’re lidded and darkened and dazed with pleasure. A reminder, that Kakashi is fucking Naruto. That Kakashi’s alpha is doing his feral best to mate him.
He fucks harder, trying to angle for Naruto’s pleasure, trying to erase any hint of another person’s claim on his body, his soul.
Naruto is not a limp participant, instead his nails are clawing at Kakashi’s skin, leaving red welt lines behind, his voice urges him on, praises him for every goof thrust that fills him just right, dragging on all the best parts, pushing him towards another orgasm that barrels down towards them both.
The strain of rarely used muscles in his hips and thighs is distant and unheeded. He would fuck for days if Naruto needed it, and alpha agrees that he’d rather leave omega plump and sore and full of come before stopping.
But he does stop, pulls out of that perfect beautiful wet pussy, grinning in glee at the mix of angry growl and desperate whine he gains from Naruto.
“Roll.” He orders, no room to argue, and everything in him is pleased when Naruto throws himself to do so, limbs shaking with the effort, with the closeness of orgasm. This leaves him presented, automatic, chest to bed sheets, face buried in pillow though turned slightly to peer out the corner of his sly, beautiful eye, and his ass held high and ready. His cunt, a beautiful entrance. Beaten hot pink and hot from Kakashi’s efforts, sinking back inside is like tasting the Pure Lands.
“Kakashi,” Naruto sighs, groans, arms stretching out to give Kakashi better leverage to fuck him. To knot him.
“It’s coming, omega,” Kakashi coos, low, letting the words hiss into Naruto’s ears. His alpha is feral for it, eyes pinned to where his cock delves into Naruto’s body, shining with Naruto’s wet slickness, the ruddy dark skin at the base collecting more blood, trying to swell.
“Please, please, Kakashi, knot me,” Naruto whimpers, and this time he’s got so much omega in his voice Kakashi’s alpha can read it clearly knot me, knot, breed me so I’m full, I’m in heat, ready for you.
Kakashi would think later, that he came inside because he knew Naruto had his birth implant and nothing would come of it.
But at the moment, he didn’t fucking care. He surges in, knot swelling viciously, pinning Naruto down when his body reacts, locking in that beautiful, ready cunt and unleashing his climax, balls well prepared and unloading so much come into Naruto’s body it’s a wonder his belly doesn’t swell. Swell with child his alpha howls. Clamed, scented by Kakashi somewhere he couldn’t remove, Naruto would smell like him for weeks.
Satisfaction settles into Kakashi’s bones even as he continues to come. With his hand curled around Naruto’s gorgeous hip, Kakashi’s idly rubbing at that thick clit, letting Naruto fall to pieces again and again around his cock and his knot, until the other is sobbing with it, trembling, mad with it.
“Hmmmn,” Kakashi mumbles into the skin of Naruto’s back, wishing he could lick at his gland, whishing he could kiss him.
Naruto purrs back, collapsed into a mass of flesh and come. Pressed tight together and locked by the clutch, Naruto and Kakashi rumble together until sleep claims them, Kakashi’s cock still swollen and locked inside.
When they wake, it’s because Naruto’s restless sleeping pulled Kakashi’s softened cock from his depths and they both cry out, needing it back, needing that connection.
Rut lasts for three days, helped along quicker by the heat partner of his wildest dreams. The hydration pills are emptied, every item of food in their apartment is eaten, and they awake basically rational again on the fourth morning, Naruto’s sweaty limbs splayed over and around Kakashi, who’s back aches something fierce.
“I’m too old for this.” He groans into the ceiling, feeling every one of his years in his joints and his vertebrae.
“You’re not.” Naruto mutters into his pec. “Too old would mean you couldn’t have fucked me unconscious like that.” Even Naruto, the ever eternally energetic is slumped with exhaustion, heat finished and probably more come in his body than actual nutrients.
A dark satisfaction purrs in Kakashi from that thought, and he thinks…well. All in.
“I might not be too old to claim you, if you don’t mind a dirty old man for a mate.” He says blithely, all his significant attention locked onto the way Naruto registers the words, stiffens, and then oof-!
He’s knocked back into the bed, nose almost crunched, mouth full of shoulder suddenly. Naruto’s lunged up at him, taken his head and forced him down over his shoulder for a mate bite, completely missing his gland and trying to wrestle him into position.
“Well?!” Naruto says, impatient, joyful, kind of bratty. “Get to it! We don’t have all day for you to be late!”
Kakashi starts laughing around his mouthful, filled with his own deep-seated happiness, and licks along Naruto’s shoulder to find the swollen gland. When his fangs sink in, and the claim takes, he sighs with the sudden feeling of security, of love and safety and warmth and…
And Naruto.