muscle memory (слэш)

“How much did Wei Wuxian pay you?” Jiang Cheng asks.
Lan Xichen’s lips quirk. “I thought that might be your reaction,” he murmurs. His tone is teasing when he reminds Jiang Cheng, “Your brother doesn’t have enough money to be able to afford to play pranks like this on you.”
It doesn’t go unnoticed to Jiang Cheng that Lan Xichen has sneakily slipped in the fact that he knows who Wei Wuxian is to Jiang Cheng, even though that information wasn’t volunteered.
(Or, yet another amnesia fic that nobody asked for.)