Actions

Work Header

Hidden in the Rain

Summary:

Tanjirou and Genya finish a tiring mission together, settling down in a cave for the night to rest their exhausted bodies and small wounds.

Tanjirou usually loves missions with others, especially with Genya.

For once, he wishes he was sent alone. Until he doesn't.

Or

Tanjirou goes into heat in the midst of ending their mission. Things go unexpectedly as they find shelter in an expansive cave for the night.

Notes:

(See the end of the work for notes.)

Work Text:

The demons head crumpled to the earth's floor with a heavy 'thump!' A large hole sat between its eyes in the frozen expression of anguish after defeat. It didn't take long for it to smither away into ashes, carried by the wind of the night. It whispered and whistled between the width of oak trees before fading into silence. Pure agonizing silence until his katana slipped from his hands and he finally collapsed. His face coated in a cold sweat.

He passed it off as exhaustion finally taking its toll, as well as the sting coming from the slight nicks and scratches gained.

Genya stood a few feet behind him, arm still raised from where he aimed his final blow. Chest heaving with adrenaline. He finally let his arm fall to its side. Eyes drifting towards Tanjirou's hunched over form, resting for a moment in the grass.

It's been a long night.

They both need some rest.

He walked over, plopping by his side on to the grass. Tanjirou had rolled over to lay on his back at this point, panting into the blissful silence of midnight. His cheeks were flushed, eyes fluttered closed until they finally opened. They blinked, taking in everything around him. Magenta eventually found gold in their search, a familiar expression of warmth and glee graced his features, brighter than the sun itself.

Sometimes he wonders how he can be so positive all the time?

"Genya," he breathed. "How are you doing?"

Genya snorted, eyes drooping with weighing exhaustion. "I should be asking you that. Ya' look like you're about to pass out."

Tanjirou grinned, his chuckle breathless in a way Genya pushed down. The air suddenly radiated the aroma of charcoal and cinnamon. He swallowed the saliva pooling around in his mouth. "I guess that makes two of us."

"Yeah, it does." He murmured, fang poking against his bottom lip. When had he taken a bite out of that demon?

He didn't remember.

They lay there for a while, basking in silence and tension.

Tanjirou eventually sat up, face turned away. "We should probably get moving, maybe find temporary shelter… Hopefully there's a cave or wisteria house nearby."

His hands drifted to his stomach, twisting with a familiar discomfort. Or maybe he'd been struck and didn't know? His palms felt warm as he looked into the distance, trees reaching far into the horizon.

Would they eventually come across a place to rest?

"The sun will be up soon, I don't know how long your form will last. Better to find one now and rest before then," Tanjirou murmured. He pushed himself up, reaching for his sword. But a hand grasped his wrist.

Heat spread up his neck, seeping deep under his skin and moving down south. Dread pooled in his gut when he remembered he forgot to ask for spare heat suppressants at the Butterfly Mansion before leaving for his mission.

Shit.

For once—despite his love of company—he wished this was a solo mission. He met Genya's eyes, bright irises ingulfed in darkness that came with his unique ability. Right. He eats demons.

He remembered it so vividly, Genya had picked up the arm he had sliced off in the midst of the fight.

The crunch of him chewing through bone had been loud.

He'd ignored it.

The eating part in itself was off putting, yes. But his ability as a whole left him awestruck; though he was also left with questions.

What else could he handle?

For all he knew, Genya presented as an Alpha. He could tell from his scent. Rain, Bonsai, and ichor.

It was different from the usual overbearing aromas Alpha's he's come across had.

Genya's scent felt like stepping foot into the dark biomes of trees and a heavy downpour on a gloomy day. A tinge of iron followed it, making it almost bittersweet.

Intoxicating in its own way.

"Tanjirou, wait a minute." Genya said, something almost stern in his tone. He dripped. But it's not like he needs to know that.

"Yes?"

"Let's just sit for a second, you look a like you're about to pass out…"

Tanjirou stills, but he stays. His sword long forgotten, just the warmth scorching hot around his wrist. Not painful, but the heat spreads southbound into forbidden areas.

His clit throbs.

Slick painting his thighs and beginning to soak through his fundoshi. He hardly registered nearly collapsing into the grass and Genya's yell of alarm. Strong hands held him in place.

And the only thoughts on his mind was those same hands behind used for the purpose holding him down to a flat surface as he was destroyed from the inside out by his mound–

He didn't hear his grunts of worry.

I just need–

It wasn't until they started moving that Tanjirou blinked, releasing he was being carried on Genya's back.

When had he started walking?

He almost didn't care.

Trying to ignore the increasingly unbareable heat between his thighs, forcing himself still. He would not buck his hips into his back! He was practically suffocating in his uniform.

He should've asked Kocho-san for some suppressants before this.

Gods. This is ridiculous.

He didn't dare try to look up at him.

But it was difficult to accomplish given he had a side view of his face in this spot.

He has such long eye lashes…

Pretty… he's so pretty.

But he wondered how he was holding himself, restraining that instinct he's heard that Alpha's get whenever they come across an Omega in heat. He's heard warnings.

He knows it's possible to restrain themselves, some just choose not to. Wild animals they are.

He had to know by now, right?

Or maybe he didn't know? Maybe he was passing off his sweat and flush of his cheeks as exhaustion, as any rational personal would after the mission they just had.

But he found it unlikely.

Maybe he doesn't just have a strong scent?

Tanjirou sighed, clutching his shoulders tighter and facing the floor. Watching him take him forward, studying the earth's soil like it held all the answers.

It didn't.

Just the crunches of leaves and branches under his soles after each step.

The silence killed him.

Usually he'd make conversation by now, but what was there to say without loosing his mind?

Going into heat unprepared during a mission mixed with exhaustion.

He wanted the fall into a pit of bushes and crash for the night. But they couldn't, he couldn't. With Genya still in his demonic form, unsure of how long it'll last, they had to make it to some shaded shelter before the sun rises.

But how long will I last?

As much as he wanted to sleep, heat cycles did not make rest easy. Especially without suppressants.

This is gonna be a long night.


They eventually found refuge in a cave, the entrance covered by leaves and moss. Enough blocking to see inside but gaps remained to let light in.

The cave wasn't too deep. It ended 30 feet in and was pretty wide for the most part.

Good enough to settle for night and half of the day until they rest enough to continue on. Tanjirou figured that wouldn't be easy as he set out some supplies on the pack he brought with him.

Nezuko didn't join him this time along. She was stood at the Butterfly Mansion to recover all the energy used during the fight in the swordsmith village. As well as her nearly burning in the sun.

He chose not to think about that.

Genya—thanks to his demonic form, still having not faded—had any wounds already fully healed. His yukata over his uniform stained with blood that he took off in the meantime.

His collarbone was also on display, the top few buttons of his uniform jacket and the shirt underneath undone. It was littered with scars, but he still wanted nothing more than to sink his teeth into his nape and–no. Stop.

Tanjirou didn't look in his direction, focused on attending to his own wounds. (As well as taking his mind off of the suffocating heat slippery between his thighs) Which were very little this time around.

Just a few scratches. They stung, but it was nothing he couldn't handle. Pain wise.

He had his haori and jacket off, chest exposed to examine himself for more potential injury. As well as the fact that he's sweating. But his button-down remained, just opened for the meantime.

He felt eyes bore into him, and he didn't need to look to see who they belong to. He knew.

But neither moved.

Instead, Genya spoke, breaking the tense silence. "You're quiet today," he noted. "You still would've been talking your head off by now."

Tanjirou bit his lip, sheepishly looking over to meet his eyes. "I'm just tired, I guess."

Genya looked fine for the most part, almost calm. Serene. But his body held a slight stiffness to it. "That hasn't stopped you before."

Tanjirou snorted, setting down the gauze. It was only some deep scratches that needed minor stitches. (Which he's been taught to do as a temporary solution until further medical care can be sought)

They hurt, he can't even lie. But what's worse is trying to muffle his whimpering while trying to close a wound, thighs clenching.

Pain only made things more unbearable.

Even the fabric of his shirt grazing his nipples brought him closer to the edge. Sensitive and brought down to stiff peaks. Tanjirou couldn't meet his eyes, nor could he fully face him. Not like this.

Not when he's tempted to beg to be bred for hours until he's sobbing.

Even then, he'd want more.

It's mortifying.

"I'm… I'm alright, Genya–" he stammered, the hitch in his breathing betraying him when his bittersweet scent grew closer.

He hadn't even noticed him get up and move closer, sitting right by his side. His body heat suddenly grounding, and Tanjirou just wanted to bury himself into his skin and stay there forever.

His expression was so gentle, contorted with concern. The sweet scent almost overidded the spice buzzing under his skin right now. Once upon a time, Genya was annoyed to even be near him. Then Uppermoon 4 happened.

And here they were.

He'd like to say they're closer now. Recalling days of eating together and a few missions they were paired on.

Rationing food, finding shelter, hell. He vaguely remembered the time they closely huddled in a smaller cave after a downpour of rain came down on them.

They cuddled to stay warm, but never spoke of it after that.

Sometimes he wonders if he was just dreaming it. But he still felt the phantom sensations of Genya holding him close to his chest. Arms wrapped around his waist, chin resting on his head.

His scent clung to him for weeks following that. Inosuke even asked if someone claimed him or something. He's had many people interrogate him on the matter.

Though no bite was present; so he belonged to no one.

Disappointment seeped beneath the surface at that fact. Sometimes he'd dream about strong canines sinking into his neck. Marking. Claiming. Genya's scent always lingered in the air when he awoke.

He'd do anything for that experience again.

Annoyance no longer lingered around him whenever he was around. Just… something he didn't know how to name.

"Are you doing okay?" Genya murmured, leering over to peek at his flushed face.

No.

I need to be pinned down and–

"I… I, maybe we should just go to sleep. I probably just have a bit of a fever?" He shrugged, setting down his jacket and haori as a makeshift futon. "We just need to rest, right? It's been a long day, after all."

Genya blinked, something flickering in his expression. But he didn't push the topic any further. "You do look a little hot," he sighed. "Fine, we should try to sleep for a while…"

Tanjirou smiled, settling down onto the cold hard surface of the cave floor. A tad bit uncomfortable, but it'll have to do. He turned to him for a second more. "Goodnight," he muttered with a smile.

Genya's expression softened, even with demonic patterns gracing his features. "Yeah… goodnight, Tanjirou."

Tanjirou shivered.

Genya retreated to his own corner soon enough.

He turned, back facing him. Hoping he'd be able to grow comfortable enough for unconsciousness to claim him.


The day came in grey and gloomy when light seeped in between the gaps of moss of vines. The sound of heavy rain echoed in the deep confines of the cave.

They'd be here for a while longer now.

Just great

Tanjirou laid there, shifting uncomfortably on his back as he stared at the ceiling like it owed him something. He had not been able to sleep.

At most, his slumber lasted 5 minutes between painful throbs of his clit. And that was on the high end of time he's capable of falling asleep.

He didn't bother trying anymore.

Just trying to muffle his whines into his haori as he bucked his hips into nothing. The skin beneath the pants of his uniform had grown moist to the point he couldn't decipher whether it was sweat or his own slick.

He was highly tempted to just strip and let the rain rinse him clean of filth. But he'd not risk getting himself an actual fever.

He's desperate, but not fully incoherent of the last remaining ounce of his dignity.

Genya lays still in his corner, sleeping? He's unsure. From what he's seen, he hasn't moved aside from the rise and fall of his chest. A sign he was still alive and breathing.

He sure hopes he's still asleep.

I do not wish for him to see me like this.

He sighed, legs shifting and clenching. What if… what if I let my hand slip and fingers do the work?

But with Genya right there?

He couldn't do that!

Gods.

He lays there, tense in his own skin. His hair clung to the back of his neck and his forehead, body fully coated in sweat.

I can't…

It comes off anyway.

Belt unbuckled and his pants haphazardly pushed down below his knees. He practically ripped off the knot holding his fundoshi on and stable.

His fingers drift, immediately finding the swell of his throbbing clit, coated in his slick. He bits his lip, two digits rubbing at it in uncoordinated circles.

Slick dripped down his thighs, staining the cave floor below. It doesn't matter…

He can smell the aroma of his own heat whispering through the air like a whistle. It clung to everything like perfume.

His gaze shifts to the taller, leaning against the wall of the cave. Seemingly deep in slumber with his jacket as a makeshift pillows behind his head.

His hands shifts further downward, fingers pulling at the slick that occasionally oozed out of him. They pushed inward without much trouble, dragging against wet oversensitive walls.

The sounds of slick thrusting were unbeknownst to him, a familiar cycle through every heat. Only this time, does he worry about a potential audience.

But Gods… does he crave it.

The top few buttons still remained unbuttoned. Neck and collarbone clearly on display. He inches deeper, finding the bundle of nerves that brought him heavy orgasms enough to satisfy the demands of his heat to an extent.

But he had suppressants then…

Would it still help now?

The squelches become louder, and he bites back a moan. Rubbing at his clit with his thumb in tandem with each drag of his digits.

Looking back at Genya, he's so close..!

He imagines himself sucking on the skin, letting his tongue trace every muscle and scar. Making his way down to his navel, reaching to unbuckle his belt–

Thunder cracked outside—loud and unforgiving—pulling him out of his sinful track of thought.

So loud… he whined.

He looks back at Genya, gut twisting in anticipation and dread. He sat up right, wide awake. His demonic features mostly faded; golden tips of his hair and hue of his eyes had faded, now back to their dark indigo colour. But they bore right into him, jaw tense.

Yet he still didn't move.

Tanjirou felt his eyes travel, studying his body language. From the clench of his thighs, the stiff peaks of his nipples making an outline against his shirt, to the hot flush of his skin.

Down to where he had his fingers inside himself, thighs slick and staining the cave floor.

He couldn't breathe.

Had he been fully coherent, mortification would've drowned him for days. But now?

He could only wonder what'd he do. What will his next reaction will be?

Would he help me get through this if I asked? If I begged?

He's never spent his heat around others. His cycle usually lasting a week at most. With the use of suppressants.

He always made sure to be alone.

For good reason, he understands now.

Being in the room with another person drove him mad with need.

I just want to be filled…

To be held through it all until it finally stopped.

Would Genya help him?

He was so tempted to reach for him, to cry out. But the painful pulse of his clit stopped him in his tracks, his thumb paused over top his swollen bud, made worse to the point he audibly moaned.

It echoed.

Footsteps grew closer, stopping at his side as a figure loomed over him. Genya crouched by his side. He was tense with restraint, but refused to touch him. He couldn't. Not like this.

Tanjirou whined. Please touch me…

"Tanjirou," Genya whispered tentatively. His hand hovered over his shoulder, enough for the heat to seep beneath the fabric but not exactly touching. "You're in… heat."

He merely mewled in response, warmth coming off of him in waves. "Gods, you're burning up–"

Tanjirou sat up, clutching on to his arms. Nails dug into his biceps, indigo hues softening at the sight of glossed over magenta. His fingers were slick. He was in tears at this point. "Pleaseplease, help me. I can't take this anymore!"

Genya stilled for a second, realization slowly dawning on him. "You don't have suppressants…"

Humiliation scorched hot under his skin, but all he could do was snuggle closer. "Please… it's too much." he pleaded, resting against his chest.

"Tanji–"

"Please!"

Genya sighed, "Are… are you sure?" He grit his teeth, hands twitching. They clenched and unclenched from fists into open palms. "I can't promise I'll be gentle.."

Tanjirou shakily nodded, "it hurts…"

"I don't wanna hurt you, Tanjirou. What if you open your stitches–"

"I don't care!" He snapped. "I need this… I need you." Something in his magenta hues burned, scorching a slight bit of red from where the gloomy light came in through the gaps of moss.

Thunder crackled once more.

Genya's pretty sure he throbbed, instincts simmering beneath the surface. He didn't know how to react properly.

Tanjirou was in pain, no doubt about it. But the need, the want for him drove him over the edge.

He didn't like seeing him in so much agony.

How could he refuse him like this?

Looking so needy…

Stunning…

"Okay, okay… it'll be alright." Genya reassures (more to himself than to Tanjirou), a hand coming up to grip the nape of his neck. It was warm, clammy with sweat; if it wasn't for his blatant debauched state, he would've assumed a fever. But the moan that slipped past his lips in reaction to skin contact earned a twitch.

Gods.

Curse me for being so sinful.

Genya leaned down, seeking his lips. Tanjirou yielded under the pressure, welcoming it eagerly. He owed himself to be tender, to be gentle with him. But the buck of Tanjirou's hips didn't make things any easier for him.

Just the primal instinct to dominate and fulfil this Omega's carnal needs. How could he say no?

He growled, tongue swiping over his lips. Finding entry almost immediately as he let his hand drift downward. He assisted Tanjirou with the rest, pants and fundoshi a pile on the ground. They drifted past trimmed curls and finally found soft folds, puffy and slick.

He practically oozed on to Genya's hand, growing closer towards his needy hole that accepted him so greedily. His lips perfectly slotted against his own, fingers that weren't slick were wrung in his hair, tugging down.

Moist heat accepted him with almost no resistance, movements languid in his exploration. He moaned apprecatively, swallowing every tearful whimper muffled against his lips. Tanjirou was scrambling, bucking against his hand and struggling to find a stable grip.

But he was so pleased, a soft purr rumbling from the Omega's chest. Soothing his racing heart. He curled his fingers upward, dragging past his g-spot before moving to target it again.

Tanjirou couldn't breathe, legs quaking with the hand between his thighs and tongue down his throat, eating up every sound he could muster.

It lapped up every crevice, finding places to taste where he didn't know tongues could even reach. It was when he broke the kiss that he could fully exhale, leaning into the skin of his chest where Genya's shirt was open.

His palm met his clit with a slap so hard Tanjirou squealed. His noises echoed in the hollow expanse of the cave. His fingers pistoning at a deeper level. "G-Gen..!"

Genya bit his lip, repeating the action to hear it again. His entire hand was obscenely wet at this point.

Another mewl echoed.

Gods…

There was a huff of impatience from Tanjirou, helplessly clawing at the buttons of his shirt. Some of them had been ripped off in his needy frenzy, but he didn't even give a damn about the destruction of clothing being done.

He craved that skin-to-skin contact.

"Pleaaase… pleahhse…!"

Genya groaned, pressing his forehead to his. Tanjirou's cries subsided for a second, his soft purrs resuming. He nuzzled further into him, eyes glossy with tears. "I.. I'm sorri–"

"It's okay." He muttered, instincts backing off just a tad. "It's okay, Tanjirou… damn it."

He would've forgotten he'd still been fingering him if it wasn't for the way he clenched when he dragged them outward, curling against that spot that was responsible for a plethora of his whimpers. He let go of his nape, using his free hand to unbutton the rest of his buttons. Their shirts soon joined the pile on the floor, and Tanjirou immediately reached for him.

Face pressed against his chest, taking in his scent. "Alpha…" he had murmured. Rain, bonsai, and ichor suddenly so strong in his senses he couldn't help but salivate, kissing along his scars and pectorals. Genya bit his lip, the sensation of his hot mouth travelling downward doing numbers to his psyche.

Alpha…

He twitched.

His fundoshi too tight now.

He nearly lost his train of thought, hand shifting in irregular angles which brought muffled whimpers that vibrated against his skin. Getting lower and lower.

He wanted to be gentle.

To care for his friend (can he even consider him that anymore?) all the way through his pain that came with heat cycles. Sex. Mating. It was such a vulnerable, intimate process.

He hardly knew what he was doing on his own, just going off of instinct. Instinct that clawed and knawed on the bars of their chambers in the back of his mind.

Wanting to be set free.

Wanting to be the one who takes control and lay siege in his cunt for as long as the cycle lasted.

To claim.

To bite.

Gods… I want it all.

He wanted nothing more than to fuck his pretty lips as he watched them graze the trail of hair leading down to his concealed cock. Which had been throbbing for hours now.

Sleep didn't stop it.

It didn't soften.

If anything, Tanjirou acknowledging him as alpha probably could've put him into an early rutt.

Hands found his belt, the sound of the buckle being loosened was almost loud between them. The heel of his palm brushed against soft pubes as he curled his fingers deeper, feeling the tight clench of his soaked walls.

He didn't register his pants being pushed down just enough for access to untie his fundoshi. He didn't register it falling to the ground. Just the muffled keen of Tanjirou's lips around his throbbing cock.

Such a perfect mouth…

All for me.

He sat up further on his knees, giving him easier leeway to take him deeper. Moist warmth surrounded him, tongue swiping over the tip of his length. "Aaah!–" it was so good. So hot. He couldn't only wonder how well he'd take him in other places. "Tanji…"

He pressed his thumb over his clit, rubbing it in slow circles just to feel the vibrations of Tanjirou's writhing travel up his cock. He bucked against it, tears streaming down his face as he gagged. "Mmmph~!"

His hips had begun to twitch and spasm, thighs quaking. His pussy clenched, somehow even wetter now. "GHhm!"

He's getting close.

Deep down, he was beyond pleased.

Every demand whispered in his ear like a temptation.

To bury himself deep into him and breed him full of his knot. His free hand grasped back on to his hair, grip tight, holding him close. Tanjirou gagged some more, but he greedily accepted his rough touch like he was dying of thirst. Strings of saliva pulled at every stroke of his tongue, clinging to veins and girth. "Hmmph…"

The downpour of rain was a distant memory compared to the thick drip of Tanjirou's slick, soaking his hand falling on to the cave ground like a permanent stain. "Gods, Tanjirou…" it squelched with every move of his fingers. "look at you…"

The incident at the swordsmith's village didn't feel like too long ago. A few months, maybe?

Just then, he could hardly stand behind in the same room as the damn omega. (His divine smell of honey and charcoal also drove him mad, he'd wanted to avoid an early rutt) Since then, they've had opportunities to grow closer.

Missions.

Training.

That night in a small cave they never brought up again.

The gods (or whoever was up there) would've struck him if he didn't admit he craved for another occasion such as that.

I do…

Every night.

Tanjirou's smaller—but still muscular—frame molded against his own as they huddled for warmth until the rain stopped. He wanted it all again…

Was this an answer?

Perhaps not what he'd intented, but…

I'm not complaining.

He eventually pulled his hand away, completely drenched as he brought it up to his lips. Bitter, it tasted. As would an organ, but it has this twinge of sweetness he could get addicted to. Almost like honey.

The Omega's breath hitched, the sight before him incredibly filthy. But even then, slick oozed down his ass even with his mouth occupied. The needy part of his brain didn't care.

Breed me…

Fill me.

Fuck me…

He's dreamt of this.

Horrid cycles he's spent in heat on other occasions where he wished someone was there with him to help him. Wished Genya was there.

Nights he's craved him at his side.

Nights where he wanted a moment to be told it'd all be okay… To be held and cherished.

Was that okay to want to be selfish?

To think about himself just this once?

He almost didn't care anymore, salivating around his length just he'd imagined in so many filthy dreams where heat tugged on his psyche. He was holding on to his waist with a vice grip to keep himself up right in this position, the other hand working what wasn't in his mouth.

He had to breathe through his nose, it proved difficult but possible with all his senses in overdrive. The tears made everything blurry, hard to see. But he didn't need to see to hear Genya's ragged huffs and whimpers. Whimpers…

Gods…

I'm making him feel good!

Heat scorched between his legs, thighs completely drenched. He wanted more of that. Pulling back enough, he swirled his tongue around the tip. Teasing the slit. What occurred was more of his Alpha's desperate whines, a large hand coming up to grip the back of his scalp. "Oh, fuck..!" Genya mewled, eyes fluttering shut when Tanjirou took him back down his throat. "Haaah! Oh my g–"

His clit pulsed at the sound, gratification like fire in his nerves at his low groans and keens. Experimenting with his tongue did wonders.

Genya choked as his tip hit the back of his throat once more, the teasing driving him mad.

He wasn't even due for his rutt yet, but with the way everything screamed at him to breed, claim, and bite Tanjirou for days, weeks, said otherwise. "Yes… yes, like that–" he bit his lip, familiarity boiled in his gut like a warning. "Gauuhd– fffuck..!" Yet Tanjirou continued like he wanted to suck him dry; he wasn't complaining about if though.

He was so close

But he couldn't let himself go, not just yet. This was about Tanjirou

My sweet omega.

Even as he pulled his head away before he could get to that point, panting heavily. "Haa…" Gracious… his mouth is so—He vaguely heard Tanjirou's whine of disappointment.

"Genya–"

Genya huffed, his chuckle sounding breathless. "I know, damnit." He was tempted to sit and admire the wreck he was right now. Drool pooling out the sides of his mouth. Lips wet and swollen. Face completely flushed and shimmering in sweat. He looks like a vision. But with the way Tanjirou is clinging to him, begging and crying, how could he wait any longer?

"C'mere…"

His head pricked up, red hair falling in layers down his neck and shoulder blades. The dilated hexagonal shape of his pupils narrowing into slits.

A small thing to notice compared to everything else happening, but… it's cute.

He settled down, cave ground cold against his skin but he hardly gave a damn as Tanjirou climbed into his lap. Hovering right over his length, tip aligned with the opening of his already oozing cunt, slick with its own lubricant. His hands found Tanjirou's hips. Plush. Soft. Different to the rest of him.

Perfect for breeding…

Breeding.

His throat went dry at the image. Pumping Tanjirou full with his knot and cum until he bore their puppies…

He ignored that thought. No… not now.

"You really ready for this?" Genya whispered, almost hesitantly despite the urge to sink canines into his neck and claim him. "I can't promise I won't lose myself…"

Tanjirou wiggled his hips, prepared to sink down. He leaned against his chest. "Yes… I don't– m-mind…" he managed to mutter. "I need you so much… I've needed—Aauuh!~" He hardly finished his sentence before he was slammed down on to girth without much restistance, the stretch momentarily aching and fading before he could catch his breath. "Yesss– ffuckk!~"

He felt so pleasantly full, the outline of his alpha's length lightly protruding against his abdomen like a permanent claim. "Genyaaahh…"

Genya had leaned into his shoulder, breathing hotly over sweat-slicked skin that sent shivers down his spine. Tanjirou was so hot and wet around him. Clutching around his length so greedily. He was rapidly losing every ounce of self-control by the second. He bottomed out not long after, holding Tanjirou tight enough to draw blood where sharp nails dug in. The other didn't even pay any mind to the sting caused by indents in his hips. "Tanji… I-I… shit, I'm s–"

"Alpha," the breathlessness in which it was uttered was enough to shatter his resolve completely. "Please… t-take me," he pleaded. "D-Do as you p-please…"

He bit his lip, jaw tense in what was left of his minor evidence of restraint. "You… you're completely sure about this?"

"Yes…"

With an assisted raise of his hips, Tanjirou began the rise and fall of riding Genya's cock. Every snug pull upward created strands of slick that stuck to his alpha's navel, clinging to silky raven pubes. Tanjirou's hands had found his shoulders in attempts to be steady. "Yesyesyesyesyesyesss!~"

The jumps always targeted his cervix, grazing his g-spot every time the tip collided with the sensitive insides of his pussy. "Genyaa.. Oh gods, oh–"

Genya pants, just in awe of the statuesque physique glistening like gold due to sweat. Nipples merely stiff swollen peaks upon his flushed chest and the warmth that visibly spread up his neck and graced his adorable face.

His jaw was slack in his pleasure, hair sticking to his skin. Magenta eyes glossed over and teary. An exquisite sight to be witness to.

But the slight was only the tip of the iceberg. Tanjirou's slippery yet tight cavern had him teetering on the edge of insanity. God… he's so fucking wet.

He almost wonders how much more messy it'll get. But it's not like he has to with slick sticking to the most intimate parts of their skin. Tanjirou's thighs were thoroughly drenched. His own cock and navel were soaked in it, beginning to drip between his legs as well.

The hottest thing he's ever seen…

Growls and chuffs rumbled from Genya's throat accompanied by heavy pants. Lips buried in Tanjirou's nape, suckling the skin until they formed dark hickeys. He was putting the stamina leftover from his abilities to use, the rapid slams of Tanjirou's hips falling elicited beautiful symphonies out of the Omega. His sweet noises echoing in the heated silence of the cave.

Holding his hips tight, small streams of blood dripped down his outter thighs. The scent drove Tanjirou up the wall, every thrust slippery thanks to the thick ooze of his sopping hole. Genya's abilities proved useful, even hours after most had mainly faded.

Skin slapped skin at a pace he couldn't comprehend in this position. He was hardly in control of his movements anymore, but it's not like it mattered. Heat boiled in his gut and he clenched, his denied orgasm from earlier reappearing with a vengeance. Squelches echoed between them. "Tanji… sshhhitt–"

"Genya–" Tanjirou cried, clenching around him in a vice grip. "Haauhh–! I'm coming..!"

The thrusts didn't slow or pause as he was thrown into an orgasm, losing the definition of oxygen for a split second as Genya's hands slid towards his rear, tilting it upward. He couldn't breathe, but the blinding sensation of being fucked through an orgasm had him frothing at the mouth. Salivating. He hardly registered the volume of his echoed sobs. "Oh, yes! R-right there, ffuhuckk!"

Genya grit his teeth, having shifted their positions slightly. Pounding up into Tanjirou's weeping cunt that made his length glisten in his wetness, adoring every single warble and moan. He could hardly keep himself in check anymore in this state. His only focus being Tanjirou. And only Tanjirou. "Good gods... Haaauh..!" He groaned. "So… so good, Omega…"

Tanjirou scrambled, clutching his shoulders and biceps so sharply they've drawn blood as well in long angry streaks left by the lethal crescent shape of his nails. "A-Alpha!~" He clenched again, snug around his length as he was thrown into another explosive orgasm. Gasping and mouthing loud against his chest as if muffling the sound would matter in here. "G-Genya—"

"T-Tanji..!" Genya stammered, his grip bordering on bruising. "Sshhi– forgive me– aah..!"

Tanjirou came again. But this time it was loud. Sobbing as he seeked out Genya's lips, cried muffled moans swallowed by his Alpha's longer tongue. He felt so euphoric in the moment. Their lips slotting together in a sloppy exchange, being held so closely so he'd never leave.

Not like I'd want to…

The thrusts had slowed, much to his whining against the motion. But it gave him time to form a coherent thought even if the pistons of Genya's cock up into his cunt were driving him wild with its cruel precision. "Haaa… Genya, I…" he murmured between kisses, breathing against his lips. "I need you…"

"I-I know," Genya whispered. "I'm here… I'm here for you."

"No… I mean– I've needed y-you for so long..!" Tanjirou confessed, sounding a bit winded. "And I.. I don't just mean to help with my h-heat."

Genya paused, his grip softening a tad. "T-Then what do you mean?"

Tanjirou bit his lip, face heating up in shyness rather than the cause of his cycle. He's long lost shame at this point. What else did he have left to lose right now? "I meant… I-I meant I need you." He clarifies. "Like.. m-more than friends who train and go on missions together and share food and cuddle in caves–" Lips silence his rambling, one hand leaving his rear to grasp the back of his neck. He melted almost immediately, the kiss deep and languid. Tongue ticking his throat, tasting every flavor his mouth could've brought. "Mmphm!~" He felt himself being maneuvered to lie on the cave floor, haori and uniform jacket rested under his head. "Gen–" he'd try between kisses, but his pleas more morphed into moans as Genya sank deeper into his fertile cunt. He could hardly breathe. "Mmmffuck~.."

Venom scraped over his lips, dripping from his Alpha's sharp canines into his awaiting mouth. It tasted like ichor, blood.

Tanjirou clenched.

Is he going to bite me?

The thought on its own had him salivating. Honey-like dripping from his own shorter canines, the two venoms mixing into something bittersweet. Genya eventually pulled away, growling as he buried his lips where Tanjirou bared his neck to claim.

His pace returned back to its pounding speed, sinking impossibly deeper. Occasionally pulling out halfway to violently SLAM back into his abused pussy. His squeals and sobs echoed loud in the cave, cancelling the heavy downpour of rain and thunder outside. A knee was slung over Genya's shoulder, free hand keeping it still with nails digging into thick flesh. His hips weren't even touching the ground, his Alpha's cock carving its shape angled downward. Targeting his g-spot over and over.

Low grunts and moans vibrated against his neck, not quite biting yet. But his tongue licked over the area on preparation, the moist sensation feeling almost cold and sterile.

He pulled his hips back, SLAMMING again.

Tanjirou wailed.

"K-KNOT! Pleasepleasepleaseeuh!"

Genya growled, licking over the bare expanse of his neck where the bonding site lies for the final time. "Mine."

All-fucking-mine.

Sinking his teeth in, canines penetrate flesh. Venom seeping deep under his skin and into his system as if it belonged there.

And it did.

Fucking finally…

Tears streamed down Tanjirou's cheeks, the claim bringing him towards another orgasm. How many have I had tonight?

He didn't know.

Lips begin to kiss them away, gentle and reassuring. "Tanji," Genya murmured. Repeating his name like a prayer.

"Pleaseeuhh… knot… m-me…" Tanjirou whimpered, nails scraping down his biceps. "I w-want–"

"Ssh, I-I know." He hissed, jaw tensed in restraint. "Gods…"

"Pleas—oh, yessss!~" he'd gasped, digging into his arms as the the hard knot slipped past his slick folds—grazing his swollen clit, filling his pulsating cunt and locking them in place. "Genyaaahh!~ I lo–"

"I love you so d-damned much, you know that?"

Tanjirou breathed, releasing his arms to reach up and craddle his lovers face. Lovers… is that what they were now?

"I-I love you too. .."

Genya melted, leaning his forehead down on to his. Using their locked position to continue roughly plowing into his fertile cervix. Tanjirou's gasps where hot against his face, clenching around the girth of his cock as he came more times than he's counted so far. 5 or 6? Maybe more…

He was growing sloppy himself, getting closer and closer to his own climax.

Especially being a first—and only—witness to the beauty of Tanjirou in a debauched state. From the swearing-turned-moaning, the sweat coating his sun-kissed skin, and the wet hug of his throbbing pussy. Pulsating and twitching around his cock, almost pulled him deeper.

From where his mouth was slacked open in gasps and moans, smaller—but just as sharp—canines peeked out, dripping with the golden coat of his venom.

A venom like theirs was sweeter compared to the iron-like or bitter taste most Alpha's had.

It wasn't usual for Omega's to leave bites to bind them to their lovers; but it wasn't unheard of either. What if I…

His smaller—but calloused hands scrambled down Genya's arms, towards his back and shoulder blades. Giving him leeway to lean downward, arching his neck enough to give him access to his bonding site. A meek gasp slipped past Tanjirou's gasp. "G-Gen…"

"D-Do it," he reassured. "I know you w-want to…"

Grasping the back of his neck, Tanjirou tugged him closer. Tongue gently lapping over the scarred skin, the sensation warm like a healing balm. He sighed. The air around them thick with the heavy scent of pheromones, sex, rain, and sweat. Tanjirou was sweet in every way. Like the season of summer was crushed into a human mold; he smelled like fresh air, charcoal, and cinnamon. But he tasted like honey. He could bask in him all day.

Finally, canines sank into his bonding site. Warm venom injecting itself in his system as they were finally bound together.

They were bonded mates for life.

Genya groaned, heat boiling in his gut. Everything seemed to move on its own after that. Plowing into his bruised cervix with a stamina he didn't know he had, fucking into his mate with a ruining intent. "Hhaah… ffuhck.. Ffuck.."

"Gaah!~" Tanjirou moaned, leaving angry red streaks down his lovers back. "Gods, Yesss!~ rightthererightthererightthere!"

"T-Tan.. nghhaah–!"

"G-Gen!–"

"I-I know, I'm–"

"CUMMINGHHA!~"

He finished with a final slam of his hips, emptying himself inside his lover with a throaty groan as Tanjirou simultaneously clamped around him like a vice. Seeing stars as he came once more. Loud. Wet. Explosive.

The two laid there, panting and basking in afterglow that had long yet to end.

Heat cycles were no joke.

But for now, Tanjirou was content to just be held by his mate.

Just like I've always wanted.

He looked up, meeting his lover's eyes. Dark and dreamy, staring him down with this serene expression he could only fawn over. "Genya…"

"Tani…" He breathed, cracking a smile. Tanjirou giggled, no resistance found in the switch of their position. Laying closely on the cold cave floor, huddled together.

This was only the beginning of his cycle.

They still had a long way to go.

But not right now…

"I… I love you," Genya murmured. "For so long… you've drove me insane with how hard it is to resist you…"

Tanjirou huffed, leaning against his chest. "The feelings mutual… and…"

"I love you too…"


The two spent the remainder of Tanjirou's heat in the cave until the rain stopped, switching to a nearby waterfall where the liquid was warm and clear.

Most of the time was spent coupling.

From being pinned against a tree to being bent over a boulder at the edge of the water.

Kocho-san was not happy he spent so long without his hand made stitches being attended to. (His stitches had ripped a few times because of their "rough housing") But given the timing and circumstances, she let it slide.

For now.

Tanjirou was already on thin ice as it is.

Though she supplied him with spare suppressants as requested. Warning him not to let it happen again. Her gentle smile subtly lethal.

The stitches. Not the coupling. That shouldn't happen again.

It didn't take long for news to get out about him and Genya's recent "bonding". Zenitsu, his fellow omega and one of best friends, continuously whined about him "getting action first".

Whatever that phrasing is supposed to mean?

Tanjirou payed no mind to it. Neither did Inosuke, who merely glanced at the bonding mark with a curious expression and went back to chasing squirrels.

He did face the awkwardness of his fellow slayers not so subtly staring at his neck or giving him looks of pity. Why would they pity me?

I'm fine!

Happy, actually.

Genya's amazing. He's so sweet and attentive! There was no need for his colleagues pity.

He doesn't care about what anyone says.

Not even the crow of the Wind Pillar leering around when he and Genya spent their time together.

He blatantly ignores it.

Nothing could be done when he and his lover were finally bonded, together for eternity.

Absolutely,

Nothing.

Notes:

Hi, this came to be because I literally find NO Omegaverse fics of just these two. I decided to fix that. Soooo.

Here ya go!!!

Enjoy.