Lan Wangji has a fantasy. Wei Wuxian gets several clues.

The tentacle climbs up Lan Wangji's forearm and tugs him closer. This time it's his turn to shiver. The feeling is — like nothing he's experienced. Cool and slippery, strong but not the strength of muscles. Soft. He wants to feel it all over. (Wei Wuxian accidentally gets cursed, which results in an impromptu sex vacation. It goes great for everyone involved.)