Lan Wangji takes Wei Ying's hand and moves it to his waistband, so he can take it off of him. That's obviously the problem here, isn't it? That Wei Ying doesn't know where to start? He moves closer, starting to undo some of his many ties.

How he'll actually get out of his clothes is a bit of a mystery, but as he untucks his shirt from his skirts, he looks Wei Ying directly in the eyes. He does always want his husband, it's true. And he's having a hard time hiding that fact now that they're here, now that he's undressing and he's drunk and Wei Ying said he gets to claim a prize...

He shrugs his upper clothing-- uh.

....Well he tries to shrug them off, but they get stuck on his wings. Very sexy.