Wei Wuxian crosses the room in two strides and brushes his mouth against Lan Wangji’s, who goes still, but permits the kiss.
For Wei Wuxian, pleasure has always been something to be chased, his body something to be indulged. Even when you’ve unexpectedly been resurrected, you never know when a particularly tenacious fierce corpse is going to show up and rend you limb from limb – may as well bask in everything that feels good while you can.
Lan Wangji, on the other hand: sometimes Wei Wuxian kisses him and he’s warm and willing and pliant. On other days it’s liked the memory of the inscribed wall of laws in the Cloud Recesses – and the Gusu Lan sect has an immensity of stupid taboos about what you’re not supposed to do, and with whom – falls over him like a shroud, and he responds to Wei Wuxian’s flirtations with a stony stillness that hurts his heart. And so far he can never tell which Lan Wangji he’s going to get.
Source: you are the one I am lit for, by yantantether – 魔道祖师 – 墨香铜臭 | Módào Zǔshī – Mòxiāng Tóngxiù [Archive of Our Own]
This is such an unusual but absolutely believable and interesting take on how Lan Wangji might react to being with Wei Ying.