He pouts a little as he realizes that the answer could be no. He certainly would hope that the other him would be reasonable, but even if they are the same..they are also just enough different that he can't be sure.

"Then I guess we better do all the dancing we can now, just in case!" His expression is positive and upbeat even if beneath the surface there is unrest.

His own Lan Wangji promises that nothing will change even when they are married and that Wei Wuxian can still do whatever he wants and spend as much time with this one as he desires. It made him happy to to know that, but he also knows that just as easily the other him could say the opposite and then it won't matter. His time with this Lan Wangji could be limited, or soon be cut off completely, and that thought makes his heart ache a little.