Chosen (джен)

Wei Wuxian took a steadying breath. He reluctantly rolled up the bottom of his robes revealing a red lotus flower on his upper thigh. 
Jiang Cheng’s hand went to his wrist on instinct. He didn’t even have to roll his sleeve back for confirmation. It was a match. 
He'd spent decades searching for his soulmate. He’d asked Wei Wuxian for help countless times, even begged him when he became desperate. And yet...
“You’ve had my mark, this whole time?”
~
(Or, you and your soulmate, romantic or platonic, share matching soulmarks. After the events of Guanyin Temple, Jiang Cheng's relationship with Wei Wuxian is strained at best. What happens when he finds out that Wei Wuxian actually has two marks, and has been hiding the one that matches with Jiang Cheng's ever since they were children?)