Archive of Our Own

Eiden swears that he went to bed alone last night— so why does he feel someone else's breath on his neck? Not to mention, a serpents' tail curled around his waist and between his legs. The winter sun, harsh and white, has started to peek through his curtains.

"Yakumo?" He asks, the only possible owner of the tail that's coiling tighter around him.

"Eiden-san," a soft, wistful voice sighs, and he feels a pair of arms squeeze around his torso, too.

"Yakumo—" Eiden croaks, the tightness around his lower half starting to make his legs go numb.

"Hn?" Yakumo blinks, pupils thin as daggers. He opens his mouth to yawn, stretching it impossibly wide, as if he doesn't have a jaw. Eiden would find it uncanny, if he hadn't seen it before.

Yakumo's forked tongue flicks out as he closes his mouth. It's only once he blinks again that he finally seems to understand what he's doing. His pupils widen back to their normal size.

"Eiden-san!" He exclaims, beginning to recoil in embarrassment. His tail loosens, but Eiden stops him from completely uncoiling with a gentle hand on his tail.

"It's alright, Yakumo," Eiden strokes over his scales a few times, feeling the muscles under them begin to relax. "When did you crawl into bed with me?" He asks, giving Yakumo a chaste kiss.

Yakumo's face reddens. "I, um. I don't remember. I just… felt so cold alone in bed last night. Then I woke up here."

Eiden groans as he stretches his arms up and loops them around Yakumo's neck. He grins when he notices Yakumo starting to stammer at the contact.

"And I, uh, really don't remember transforming my lower half into a tail. I'm so sorry." He frowns, but instinctively leans closer into Eiden's embrace.

"Don't be," Eiden purrs, "Waking up next to you was a pleasant surprise. Sounds like your serpent survival instincts kicked in."

"Mm, that sounds right," Yakumo says, squeezing his eyes shut as he lets out another wide-mouthed yawn. He can barely keep his eyelids open.

"Sleepy again?" Eiden chuckles. He supposes it makes sense. Yakumo always tends to get more lethargic in the winter, spending most of his time bundled up or by the fireplace. He's slower to start his days, sometimes falls asleep in odd places. He had just never sought Eiden out in his sleep like this before.

"M sorry," Yakumo mumbles, and Eiden huffs out a sigh. It won't help to chide him for apologizing again. Plus, he's just too adorable right now.

"If it's the cold that's got you so zoned out, I've got something that might warm you up," Eiden teases, sliding his hand to the place where Yakumo's tail meets his torso, his sensitive underbelly that's still cool to the touch.

He pets over that spot, the faintest line down Yakumo's middle that indicates something's hiding from him. He dips a finger into the slit, and Yakumo bites back a whimper.

"Hn, Eiden-san—" Yakumo's tail spasms around him, the end flicking around his feet.

Eiden smiles to himself and presses his fingers deeper inside, trapping the head of one of Yakumo's dicks between the knuckles of his fore- and middle- fingers. He rubs both fingers against it and eases it out of the slit.

When Yakumo's got his tail out, his lower anatomy becomes a strange mix between his serpent and human sides— a side affect of keeping his human torso, making him a bizarre hybrid of his two possible physical forms. Eiden likes it, though— Kuya and Garu often exhibit their animal traits. It's just part of being yokai, and Eiden hopes that Yakumo continues to feel comfortable enough to share that side of himself with him.

And it helps that Eiden is just the kind of freak to find potential sex with a snake hemipenis really damn hot.

He glances up to see Yakumo biting down on his lip, his nostrils flaring as he tries to keep his composure. His pupils are thin again, and the faintest feeling of dark essence lingers in the air, more scales appearing in patches on his human skin, shimmering silver-black.

Eiden can fit a few more fingers in the cavity that keeps Yakumo's genitalia, so he digs them in, fascinated by the wet heat he feels, so different from Yakumo's outside temperature. He strokes down the cock he had exposed, fingertips sliding between the two lengths. Yakumo's second phallus pops out while he's playing with them, and Yakumo's mouth gapes open. His fangs are longer when he's got all his snake traits on display.

"Eiden-sssan," Yakumo's voice is low, and the consonant sound of the honorific elongated like a hiss.

"Does that feel good?" He asks, stomach fluttering with delight.

"Yesss," Yakumo says, eyes a bit dazed, before he tries to regain some of his human composure. "Yes, but—" He frowns. "Kiss… I want to kissss—" The hiss comes out at the end, even after he'd stopped himself just before.

Eiden huffs out a little laugh. "Of course we can kiss. You really like it, huh?" He leans in, lazily stroking Yakumo's cocks. Yakumo kisses him, with a deepness and fervor that contrasts his previously languid behavior— like he wants to eat Eiden alive.

It's enough to make Eiden distracted, his hand stilling at the base of Yakumo's hemipenis, his own head too fuzzy with arousal to focus anymore. Yakumo's tongue invades his mouth, and he feels the forked sides of it on either side of his tongue, and he hates that his first thought is 'it's like they're scissoring'.

Yakumo sucks on his lip, bites at it, his fangs pricking the delicate skin— Eiden starts to taste blood, but he doesn't really care. Yakumo's hips are undulating, rubbing his bare cocks against Eiden's—still trapped in his sleep pants, soft but quickly coming to life.

"Eiden-sssan, ssso warm—" Yakumo says between kisses. "I want to ssstay here, with you," he says, lips wandering to Eiden's neck. He latches onto his collarbone, tail moving faster, frantically trying to get closer and closer to Eiden, despite the fact they were already nearly melded to each other. "Inssside, inssside you—" He says, sentences slightly broken, like he's starting to lose his grip on human speech. Eiden finds this side of him both fascinating and arousing— this unabashed, animialistic want.

"Okay, okay, hold on," Eiden says, though Yakumo's already started to use the strength of his tail to roll the clothing off Eiden's lower half. He's impatient, slithering between Eiden's legs and rocking against him, almost in a trance. "Hey, you're not gonna be able to get inside me just like that," Eiden says.

Yakumo doesn't seem to care, despite how he had been pleading just a moment before. Eiden doesn't mind either— if this is how Yakumo wants to warm up, he'll take it. He holds on, groaning softly each time Yakumo's teeth find a new spot to bite. Yakumo thrusts between Eiden's legs, one dick constantly grazing his balls, the other rubbing against his hardening length.

Eiden feels Yakumo's breathing get increasingly fast as he seems to approach orgasm. Eiden got worked up pretty quickly, making him not far behind. Yakumo's wandering mouth finds its way back to his lips, and Eiden's moans are trapped between them while they frot against each other.

Yakumo's tail is relentless, powering the thrusts of his cocks hard enough that he can feel one of them prod against his rim, aching to penetrate him.

"Yakumo," Eiden pants, "Hey, I'm gonna—" He cuts off with a loud groan, surprisingly being the first to cum. He trembles and whimpers when Yakumo keeps pushing his cock between his legs, hypersensitive. Yakumo isn't in a state to listen. He lines up with Eiden's rim and pushes in as deeply as he can, causing Eiden to try out at the intrusion— he didn't have time to fully prepare himself. "Yakumo—" He whines, wincing at the pain.

"Eiden-sssan feelsss good," Yakumo says, the force of his thrusts driving Eiden into the mattress. "Warm, warm—"

Eiden cups Yakumo's cheeks with his hands, rubs his thumbs gently under his earlobes. Yakumo shudders— his gemstone is sensitive. He forces Yakumo to make eye contact with him, and is sure Yakumo sees the tears in corners of his eyes.

"Hurt?" He asks. "Did I… hurt you?"

"Just- just a little bit," Eiden admits. "I told you to be careful, I wasn't ready."

"Sorry," Yakumo pouts. "I'm sorry, but Eiden-sssan—" He squeezes his eyes shut, biting down on his lip. He pushes into Eiden again, the pain thankfully numbing into a dull ache that is outweighted by the pleasure that wracks through him with each press against his prostate. Eiden struggles to keep hold of Yakumo's face, and is left clinging to his shoulders, instead.

"You feel too good, I want—" Yakumo groans, face tucked in the crook of Eiden's neck. "Want you all to myself," he says, cutting off with a grunt as his tail tightens around Eiden. He bites down on Eiden's collarbone as he spills over, stilling as he waits to ride it out.

After a moment, though, Eiden realizes Yakumo has stilled a little too much. "Yakumo?" He asks. The serpent's face is hidden in his neck. Eiden brushes his hair out of his face, only to find Yakumo's expression incredibly peaceful, and his breathing even. "Don't tell me you fell asleep?" Eiden chuckles, and a soft snore against his skin is enough of an answer. He runs a hand through Yakumo's hair, perfectly content to doze a little more, too. "It's rough being cold-blooded, huh?"