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"Wei Ying! This is..."
Wei Wuxian, who had been sitting peacefully next to Lan Wangji, fully pulled him over so that he was straddled in Wei Wuxian's lap, Lan Wangji's hands landing on Wei Wuxian's shoulders.
"Lan Zhan~ what are you thinking about? I just wanted to hold my little husband."
Lan Wangji glares at him, his ears bright red and fists clenching at the fabric of Wei Wuxian's robes.
Wei Wuxian had been in a playful mood all day, slowly escalating his flirting and trying to get a rise from Lan Wangji. They were supposed to be trying to find a way to send Wei Wuxian back to his time but they had yet to find anything helpful. (The fact that Wei Wuxian would rather poke at Lan Wangji’s cheeks than help read doesn’t help).
Seeing as how it was Wei Wuxian's own talisman design that got him into this situation, Lan Wangji had (rather mistakingly) thought that between the two of them, they would be able to find a solution in no time at all. Lan Wangji doesn't understand why he isn't trying harder to return to his husband in his own time. Knowing himself, Lan Wangji would not be pleased. However in the present, more time researching means spending more time with Wei Wuxian, so Lan Wangji has little desire to complain about the circumstances.
He'd always been drawn to Wei Wuxian, even when he'd been studying as a guest disciple. And something about this older Wei Wuxian who is so open with his affections that Lan Wangji can't deny his intent is... intoxicating. And who is Lan Wangji to deny his (future) husband? Surely there's a rule in the precepts about properly satisfying one's spouse.
But this position wouldn't do.
Lan Wangji pushes Wei Wuxian back until his back hits the ground and crowds over him, one hand already loosening Wei Wuxian's belt. "My turn now."
Wei Wuxian, who looks satisfyingly shocked, squeaks and flushes bright red.
"Lan– Lan Zhan! This isn't– I didn't mean to–" Wei Wuxian twitches and bites back a moan when Lan Wangji runs a hand across his exposed chest. "Stop–!"
Lan Wangji takes Wei Wuxian's hand and presses it between his legs. "Little husband?"
Wei Wuxian presses his lips together, a slightly strangled sound escaping him and looking pitifully unprepared for someone who has been provoking Lan Wangji all afternoon.
Lan Wangji flicks at a nipple in retaliation.
"Mngh!"
"Wei Ying wants to play innocent when his body is like this..." Lan Wangji whispers into his ear, "How many times must my older self have had to use it for me to get this kind of reaction so easily?"
"Lan Zhan... mean!"
"Am I not giving Wei Ying exactly what he wants?"
"Was Wei Ying not so desperate for his husband's attention that he has been provoking me all day and even grabbed me without my permission?"
"Lan– ah–!" Lan Wangji rolls their hips together.
"Spread your legs."
Wei Wuxian's legs dropped open (without his permission, stupid legs).
“Very good.”
Wei Wuxian's breath stutters, eyes going glassy before he regains his standing.
"Wait wait! We're still in the library, shouldn't we at least move to the Jingshi– Lan Zhan!"
Uncaring of his husband's concerns, Lan Wangji continues stripping him from his robes until Wei Wuxian is completely exposed. “No.”
Wei Wuxian's eyes flick from Lan Wangji to the door, but the slight trembling of his body betrays his excitement.
Unable to help himself any longer, Lan Wangji descends on Wei Wuxian, mouth open and eager. He laves at Wei Wuxian's pert nipples, biting across his chest to give the other equal treatment, and rocking his hips down against Wei Wuxian's all the while.
Despite his earlier concerns, Wei Wuxian is openly moaning now, unable to muffle his voice with his arms tangled in the mess of his own robes. Lan Wangji sits back and takes in the vision beneath him, Wei Wuxian glassy-eyed and flushed pink from his cheeks to his well-loved chest.
"Look at you." Lan Wangji leans down and licks at Wei Wuxian's glistening lips where they're parted and heavy pants escape his lungs.
"So lewd."
Wei Wuxian's lips chase his where they brush as Lan Wangji speaks, chin tilting up in a silent plea for a kiss and Lan Wangji licks deeply into his mouth as a reward.
They pull back, lips wet and breathing heavily.
"So pliant. You're not supposed to be enjoying this."
That makes Wei Wuxian glare up at him. “Am not!"
Wei Wuxian squirms, arms tugging out from where he's trapped under his hastily-removed clothing.
Once free he immediately tries to twist himself out from under Lan Wangji, managing to squirm into a crawling position and get about a handspan away before a hand clamps around his ankle. Lan Wangji ignores Wei Wuxian's protests and calmly drags Wei Wuxian back toward him, appreciatively eyeing the way his trousers cling to his rounded ass.
His eyes catch on a dark patch of fabric, at first mistaken for a shadow, but then Lan Wangji realizes the fabric is damp. Lan Wangji cups Wei Wuxian between his legs over his trousers, making Wei Wuxian yelp, and rubs at his steadily leaking hole with his thumb.
"Wei Ying is wet." Lan Wangji only faintly registers the words leaving his lips.
The fabric squelches soundlessly under his touch.
"Nngh– Lan Zhan?"
Lan Wangji loses all patience.
Wei Wuxian shouts when Lan Wangji his trousers down and spreads his cheeks, the cool air making his puffy hole twitch as if beckoning to Lan Wangji. With one hand Lan Wangji teases at the rim, opening it enough for his tongue to slide in between his fingers. Lan Wangji fumbles at his robes with the other hand, tugging at his belt while he devours Wei Wuxian's slick hole like he's starved for it.
Wei Wuxian squirms and clenches down on his tongue rhythmically, moaning freely into the air as more slick leaks from him.
As soon as Lan Wangji's robes are open, he yanks down his own trousers. Lan Wangji presses Wei Wuxian's cheeks together and slides his cock between them, coating himself with Wei Wuxian's slick.
Wei Wuxian trembles and pleads, "Er-gege, no this isn't right. We shouldn't be doing this ahn gege, let– let me up."
Lan Wangji leisurely thrusts against him, watching in a daze as the head of his cock catches repeatedly on Wei Wuxian's hole.
All at once he pushes the full length of himself into Wei Wuxian, groaning as the impossibly tight, wet heat of Wei Wuxian consumes him.
Wei Wuxian moans and grapples uselessly at the floorboards, tries to inch forward, away from the stimulation. Lan Wangji kicks his knees further apart and pulls Wei Wuxian flush against him with a wet slap.
He grips Wei Wuxian tightly by the hips and leans forward to whisper.
"Wei Ying must take responsibility for teasing me all day." Lan Wangji rolls his hips and Wei Wuxian chokes out a groan when he presses even deeper.
He fucks Wei Wuxian with abandon, wet slaps of their hips echoing in the empty library, moans barely muffled in each other's skin.
If anyone were to walk in there would be no mistaking what was happening, and the thought only excites Lan Wangji further. He shifts his hold on Wei Wuxian so he can thrust in at an angle that has Wei Wuxian writhing, aiming for the spot that makes Wei Wuxian curl up in ecstasy.
Lan Wangji pulls Wei Wuxian into a kiss, unable to resist when he sees the way Wei Wuxian is practically drooling.
"Good, Wei Ying."
Wei Wuxian spams and clenches down tightly as he shudders in release, cumming in spurts all over himself where his untouched cock swings between his legs with each thrust.
Lan Wangji feels as if he's melting, he shoves in deep and he feels the head of his cock squeeze past an even softer, tighter ring of muscle deep inside. Wei Wuxian's eyes roll as Lan Wangji fucks into that deep silky spot that shapes itself around him, Wei Wuxian's body making room for his cock, and Lan Wangji can't take it.
He cums hard and fills that spot to the brim with his warm spend, Wei Wuxian weakly shaking through another powerful orgasm that's almost painful in its pleasure. Wei Wuxian collapses into a heap, hips still held up by Lan Wangji.
The arch of his back makes Lan Wangji perk up valiantly in interest but Wei Wuxian whines.
"Gege nooo, seriously please! Have mercy, how is it that you know how to fuck me so well even in this form? I won't be able to walk, I might pass out if we go again!" Lan Wangji turns him over and carefully pulls out, pressing a kiss to Wei Wuxian's forehead
"Mn. No more. Wei Ying took his punishment well."
Wei Wuxian giggles breathlessly, lips bitten red and plump, Lan Wangji captures them again in another kiss.
"Aiyah, Lan Zhan! You're still the same now as you always are, never change."
Lan Wangji presses a kiss to his lips in promise.