Content: This one has demon sex so there's bloodplay and whatnot, have a nice day.

night streets, free walking

By: Aviantei

Demon!Rairi AU (Raigaku):

"Getting Worse 'Til There's Nothing Left II"

"You look a bit dissatisfied."

Rairi has begun to look like a demon more and more as the nights stretch into weeks. Their nails have become more permanent claws, the color has drained out of their skin, and now there are painted lines across their cheeks, a red much like the blood that always ends up splattered across their face whenever they devour a body. The changes are similar to these ones he's gone through, and Kaigaku can't help but wonder if there's something subconscious in Rairi that's doing that, or it's just how they would have changed otherwise.

Rairi has also begun to talk in more frequent bursts, no longer just silent and following along. They'll occasionally chime in when it comes to planning strategies to attack people, though the contributions are rare. They haven't told Kaigaku that they hate him yet, so he's considering that a good thing.

(Sometimes he wonders if Rairi can even hate him, if Kibutsuji did something to them that makes Rairi willing to follow along with Kaigaku's whims, or if they've just snapped to the point that they can no longer feel anything at all.)

And now, they remark on Kaigaku's expression, and he latches onto the sound of their voice. In general, post-transformation Rairi doesn't speak until spoken to, but they've initiated a conversation. There's no way Kaigaku's going to pass the opportunity up. "What do you mean?"

Rairi shifts on their cushion. The two of them have upgraded to the home of a family they killed and ate together a few weeks ago, and it's an odd spot of domestic energy in the rest of what they've been doing together. If Rairi is bothered by the choice in prey, they haven't said anything, even as the two of them have torn through innocents, through Demon Slayers that were far too weak to be a challenge, through the Kakushi accompanying them. Tucking a piece of their now loose hair behind their ear, Rairi says, "When we were eating. You had a sour look on your face. You didn't like it?"

The words are vague enough that this could be an ordinary conversation, all the way back at Sensei's home. But this house has nice furnishings while being smaller in size, and the windows are closed tight against the sunlight, and the it Rairi's talking about was a person, not some weird new side dish that Zenitsu suggested and isn't to Kaigaku's tastes.

Kaigaku shrugs, decides to break the illusion before it can drag anything else up from the broken box that's somehow still present in his heart. "Some people just happen to taste better than others. It's the same as pulling a peach off the tree." He picks at his teeth, swallowing down the dull-flavored fragment of muscle still sticking to the side of his incisor. "If it makes me stronger, I don't give a shit."

Rairi's face shifts closer to an amused smile. "I mean, yes, we need to eat to live, but it's still better when we enjoy what we're eating." Rairi lifts their hands for heavens knows what—and then they've ripped their razor-sharp claws across their open palm, and the rich metallic aroma spills out into the air.

Kaigaku's hands snatch out for theirs to stop any further damage, as if they'd committed the act as a human and not as a demon that can heal right away, transfixed as a small puddle of red forms in their cupped palm. "What are you doing?"

"The blood's your favorite part, isn't it?" Rairi asks, as blunt as ever, and Kaigaku's not surprised that they noticed. Their eyes have always been sharp like that. That almost-smile gets a little closer to the real thing as they look up at him. "You could think of it like dessert or something." A sound like a snicker. "A reward for being good and eating all your vegetables?"

They're teasing him, of all things, but Kaigaku doesn't have the mental capacity to care; all his resources are overloaded with trying to process the fact that Rairi's offering him their blood, and saliva starts to pool under his tongue. He pauses a moment, as if waiting for the punchline. When one doesn't come, he dips his head down to meet their hand.

The flavor rips over his palate, bold and beyond gratifying. He'd had a vague taste of it before, his tongue shoved into their bleeding mouth as he tried to get them to swallow, but that was mixed in with Kibutsuji's blood, so he didn't get to appreciate it in full. Now, though, Rairi is all that he can taste, and Kaigaku drinks up every last still hot drop that's available to him, feeling like he's almost floating.

Whenever the wound seals back up on its own, Kaigaku's fangs tear it back open to keep drinking. Rairi doesn't complain, not when he does it the first time, nor when he does it a second, a third. By then, there's a warm satisfaction creeping into his stomach, and he makes sure to clean away every little smear of red he can reach with his tongue before finishing. Kaigaku presses his lips against Rairi's palm and looks up to them with lidded eyes. "Thanks for the meal."

Rairi nods, looking satisfied and somewhat flushed. With their new pale skin, the color is even more pronounced than it was when they were human. Their lips part, but no sound comes out—though Kaigaku doesn't need that for him to understand.

He chuckles, sitting up straight. "I know you devour everything, but you can't tell me you were satisfied with what we had, either." Mirroring their earlier motion, Kaigaku slices a clean line down his own palm and offers it. Rairi tries not to rush, but their hands catch onto his wrist, and soon their lips and tongue are probing the cut, drawing blood into their mouth with ease. A satisfied hum reaches his ears. "You should've just asked if that's what you wanted."

Rairi's hand smacks his bicep, but soon it's back to steadying his arm. Claws and calluses aside, their skin is soft, and their fingers are gentle, yet the touch feels like they're branding him. Kaigaku doesn't mind; if Rairi ever marked him as theirs, he'd wear it with pride. But he also knows that, unlike him, blood isn't Rairi's favorite.

His free hand manages to catch under their chin, and Rairi scowls at him for the interruption. Kaigaku runs his thumb over their lips, the smeared blood looking like a fresh layer of lip color, and then he pops his left index finger between their teeth. Rairi's eyes go wide, though he can already feel the sharp points of their fangs poking at the skin. "Go ahead. It's fair. You like the bone best, don't you?"

The echoing crack of teeth through knuckle is answer enough, and Rairi covers their mouth with their hand as they chew. Kaigaku does feel the pain, sharp and searing, and he pops his end of the severed digit in his mouth to keep the blood from getting all over the floor, but it's not long before a whole new finger has reformed to replace the one now getting crunched to bits between Rairi's molars. The fact that they look embarrassed while doing it just makes it better, and the flush is just a reminder of the flavor of that Kaigaku realizes he was foolish for thinking he'd had his fill of.

Kaigaku thinks it would be such an utter waste to not indulge in someone who can heal fast enough to replenish the supply, and the idea that's wandering into his mind is making his mouth water all over again. Rairi glances up to him, teeth pressing down on their lower lip hard enough to draw a fresh dribble of red that slips down their chin, and they and Kaigaku lock eyes for a split second before they've both moved, fangs tearing open each other's mouths, their blood mixing together.

Kaigaku supposes that what he did back on Rairi's last night as a human counts as a kiss—but this is such a different experience for so many reasons. Rairi fits in his lap as Kaigaku's mouth works its way to their neck to drink from there, and Rairi grasps onto his hair. In time, their hands fumble down to the buttons on his uniform jacket, clearing the way for Rairi's mouth to press against his collarbone before tearing a shattering bite out from it as well—and then everything's a matter of sweat and blood and crumbling bone and heavy breaths as the two of them devour each other, and Kaigaku at last realizes that he's hard whenever Rairi's hand is already pressed up against his crotch through his pants.

By now, both of them are a mess—the major wounds healing, but still leaving blood everywhere, clothes open, rumpled, and torn but still half on, drool trailing shining lines across their faces—and it's almost unbearably hot for him to look at. Of all things, though, Rairi hesitates here, and Kaigaku cannot help but remember overhearing lectures that feel like they're from a lifetime ago. After everything he's fucking done to them, Rairi still wants his consent? He growls in frustration and looks them dead in the eyes. "We are not stopping. Not after all this. You want it? Fucking take it."

The relief that washes over Rairi's expression is immediate, and then Kaigaku can't see what face they're making anymore, because they're untying his kimono and undoing his belt and pushing his fundoshi aside. He hears Rairi take in a breath, and then there's wetness and heat pressing down over his length, and Kaigaku can't help but notice what a dangerous game they're playing now, when those teeth that so happily cut through bone could easily rip him apart then and there.

Kaigaku tries not to think too hard about the fact that he almost likes the idea, thinking what it would be like if Rairi would devour him with the same passion that they consume everything else.

Lucky for him, Rairi is also giving him plenty to be distracted by. They don't do anything as brutal as bite his dick off, but they sure aren't gentle, either. Each little prick of their fangs (painful, yes, but painful in the best possible way) draws blood, and soon there's a pale pink mix of spit, gore, and precum lubricating Rairi's lips and making it more than possible for them to move down ever lower and deeper while the most delicious sounds muffle against him.

Kaigaku is torn between two prospects: letting Rairi finish him off and making Rairi call out his name. The second wins, and he pulls Rairi off him with a fist in their hair and a hard tug. Rairi tries to glare at him, the effect ruined by the dribble of fluids running out the side of their mouth, by the flick of their tongue as they clean up the spill. Kaigaku just grins back. "I never said I was done eating you just yet."

He expects Rairi's embarrassment, but he's met with them hauling themselves up to undo their own belt while Kaigaku reminds himself that it's not the best idea to attempt to tear apart their Corps' uniform with his teeth. He entertains the idea of doing it to their underwear anyways—but Rairi yanks both articles of clothing down, pulling one leg free and not even bothering to kick off the other in their haste. Kaigaku ends up propped up on one arm at about a thirty-degree angle with Rairi's knees on either side of him, catching the sight of Rairi's muscles and chest through their open jacket and almost too mesmerized to focus on what he was about to do.

Rairi's claw pokes into a spot in the middle of their stomach, drawing a thin line that trails through their abs and right down to where their pubic hair is waiting, the resulting blood making a clear path for Kaigaku's tongue to follow, and then the hand that's not keeping him upright is on Rairi's ass, pulling them forward until his face is buried in them. Soft hair tickles his nose as he presses a hot kiss over their clit, giving it an experimental flick of the tongue before changing locations and slipping inside. Up above, Rairi moans, their walls squirming and their voice breathy:

"Kaigaku…!"

Kaigaku feels like he's been waiting his whole goddamn life for them to say his name like that, with pleasure and passion and desire. There's no way he's satisfied with that one time alone, so he licks and sucks and fucks them with his tongue—and he's not disappointed in the slightest by the sounds that pulls out of their mouth, the way they repeat his name, begging for him and him alone.

Rairi's taste is heady and somewhat bitter, and the gods know they're wet enough. Kaigaku revels in both these facts—but it could be better. When he bites, Rairi's voice jumps up an octave, but any pain in the sound melts away into pure delight as he continues his ministrations. The addition of their blood on top of the flavor already filling his mouth is addicting, and Kaigaku drinks it all up as he pushes to find the best spots to make Rairi's hips wriggle into him, seeking more.

Everything about Rairi's reactions is fucking amazing, and Kaigaku's become hard enough that he can feel his dick pressing against his stomach. He abandons propping himself up, his head half landing on the cushion he sort of recalls sitting on beforehand, and pulls Rairi along with him, letting them sit on his face. When he shifts and reaches his free hand down to jerk himself off, Rairi's fingers catch hard on his wrist, their grip enough to make his bones creak. "Come the fuck on," he breathes, his words sending puffs of air across Rairi's cunt. "I'm not in the mood for you telling me I can't get off." Though that thought does bring with it another enticing prospect, it's one Kaigaku has no intentions of giving up power for right now.

"Calm down," Rairi says, sounding anything but calm themself. They yank his hand up to bite off a fresh morsel of bone for themself—this time the top two joints of his ring and middle fingers—before tossing Kaigaku's now bleeding extremity towards his face. They swallow, the pulse of muscle in their throat enticing, and then they grin. "Are you telling me you'd rather use your hand when you could come down my throat?"

Kaigaku groans without even being touched, and Rairi takes that as permission to make just that happen, lifting themself up. They're not wrong—Kaigaku's been dreaming about watching Rairi swallow his cum for much longer than he'll ever admit out loud—but he also doesn't want to lose. When they attempt to pull away, he drags them back, his claws cutting fresh gouges into the back of their way too sexy thighs that he's beyond ready to have his face crushed between. "You first."

Rairi rolls their eyes and takes advantage of the blood now slicking under Kaigaku's palms to slip out of his grip. He swipes back out for them, but Rairi's already repositioned, on hands and knees with their ass in his face and those disorientingly gentle fingers pulling Kaigaku's dick back to their lips. "Thanks for the meal," they downright purr, and then it's back inside their mouth he goes, and Kaigaku first utters a curse, then Rairi's name.

He's pretty sure they smirk around him, but it's kind of hard to tell when his head slams into the back of their throat, heat spreading from his groin through every last centimeter of his body. His attempts to see what's happening are thwarted by Rairi's everything being in the way, and then they jerk their hips back towards him, and, fine, if they want to be this way, he's at least going to make them come first.

It takes a little bit of adjustment at the new angle, but soon Kaigaku's got Rairi moaning again, and, while he can't make out the exact syllables with their current mouthful, there's a pleasant little three-beat sound they keep making that has to be his name. Rairi pulls plenty of gasps and groans out of him as well, and soon both of them are jerking their hips into each other's faces, all blood forgotten but them consuming each other regardless.

Despite all of Kaigaku's best efforts, he moans loud, and his orgasm comes first, a little slow to start before the rest comes rushing out of him. Rairi makes a little sound of surprise—which is just fine; Kaigaku would be just as happy with them choking on his cum as not—but then there's a tell-tale gulp, followed by several more as Rairi sucks him dry and takes it down along with every other piece of him they've swallowed today. Rairi still rolls Kaigaku's softening dick around in their mouth a bit longer after he's finished before setting him free and pressing a kiss against the tip, right on the slit.

Kaigaku was the only one that was really competing, but of course Rairi beats him at this, too. Still, he's not about to admit defeat just yet, so he shakes off the combination of full stomach and post-orgasm lethargy that's threatening to pull him under and yanks Rairi back towards him, earning the full force of their moan now that there's nothing in the way to smother it. Kaigaku's a fast learner, and he's managed to figure out Rairi's favorite spots and angles already, so it's not long before they're unable to hold themself up anymore, gasping and moaning and mewling against his stomach.

"Oh, Kaigaku, yes, please, I'm gonna—! I'm coming, fuck—"

With Rairi trembling, Kaigaku flicks his tongue across their clit as quickly and thoroughly as he can muster. Rairi's hands fist in the pantlegs still hanging off his hips, and, even when their voice comes out in weak little whimpers and he can tell they're finished, he pushes a bit longer, reveling in the near sobs that earns him before pulling back, Rairi's slick and blood drying on his lips. All that follows for a while is the sound of their combined heavy breathing, and, among the absolute satisfaction he's feeling, Kaigaku can't help but think of how much of a bitch it'll be to clear the bloodstains off the floor, assuming they ever even bother to.

Eyes still shut, Kaigaku shakes Rairi's thigh in hopes that they'll maybe move into a more comfortable position for them both. It takes them a moment, but soon Rairi lifts themself up, their weight disappearing off his chest and stomach. He waits for the feeling of their head on his shoulder, the tickle of their long hair against his skin, but there's nothing but the rustling of clothes, and when he opens his eyes, Rairi's trying to put back together the buttons on their jacket over their shredded undershirt, looking skittish in a way that's just downright unnatural.

"Are you fucking thinking of leaving right now?" Rairi flinches, some excuse or another that he doesn't want to hear starting to form on their lips, and Kaigaku pulls them down by the hair to lie back on top of him. "You're not someone I would just fuck and walk away from. Goddamn. I want you here."

Rairi's small exhale leaves goosebumps across his shoulder. "Because you need me to live?"

Kaigaku goes deathly still. The question isn't even accusing, and that's what makes it worse. He didn't even realize Rairi had heard that, remembered it through the haze of their impending transformation. But they did, and Kaigaku's immediate instinct is to deny that he ever said it. And while he doesn't do that, he asks back, "If you have a problem with it, why didn't you kill me when it was your fucking job?" instead of what he should be saying, which is, Yes, I need you.

Rairi moves, but they curl in closer instead of jerking away, the former of which Kaigaku was preparing himself for. "…Because I don't want you to die."

Kaigaku loosens the grip he still has on their hair, moving his hand to pat their head instead. "Then why are we arguing about it?"

"You're the one that picked a fight!" Rairi sounds exasperated, but there's something that suspiciously sounds like a sniffle that follows their words. "But okay. If you need me to live, Kaigaku, I'll live."

Those words are something that he didn't want to admit he needed to hear, but when Rairi says them, the blue haze of anxiety that's been nesting inside his chest lessens, disperses. "And if you don't want me to die, Rairi-senpai, then I won't die."

These are promises that neither of them can guarantee they'll keep. But both of them are stubborn, and Kaigaku knows he'll be damned three times over before he just sits down and accepts death—and Rairi's the same. Even if there's an uncertainty about the future, the two of them will struggle and claw their way forward.

Rairi hums, their fingers tracing delicate patterns across the flakes of dried blood (his? Theirs? Both? A goddamn mystery) sticking to his skin. "I don't think it's appropriate for you to call me 'senpai' anymore."

"Like I give a shit."

And somehow, in the middle of this worst possible outcome, there's laughter; Rairi kisses him, and Kaigaku reciprocates, rolling them over so his body weight presses down on theirs, their hands already trying to peel of the pieces of clothes he's still wearing to start all over again.

[Author's Notes]

I'm at a con right now, so I don't have much in the way of comments, so take this angsty demon smut lol. Sometimes I'm just in the mood.

Thanks to Sharanya Suryawanshi and marklagos1978 for the fav and follows on walk steady works; you're very cool.

Yes, this is the continuation of the "Kaigaku turns Rairi into a demon" scenario from wandering road, wherever you are.

Do check out the little paths we find ourselves upon, for a ton of extra canon walk steady content I worked hard on it this summer.

I have a bunch of nsfw wips in my docs so I don't know what's next if you have requests lemme know and I'll see if something I has matches it. Look forward to a new piece in wandering road, wherever you are next month, tho!

-Avi

[09.02.2023]