Wei Wuxian hasn't spent much time down there himself, but he does wonder how anything fits inside such a tight spot. Still, he knows Lan Wangji would not lead him astray, and so he settles next to him, propped on one elbow while the other reaches for the puckered flesh between his legs.

He presses his lips to Lan Wangji's, and his fingertips to that ring of muscle, circling it slowly. His heart is racing, but he takes comfort in the fact that the warmth of Lan Wangji's mouth is intimately familiar.