His steps slow at both the kiss and the inquiry, fixing his husband with a curious (yet knowing) look. It's not as if Lan Wangji hasn't had the same thought, but he allows Wei Wuxian to put words to it.

"Mn, we will rectify this."

With that, he picks up the pace again, heading to climb the stairs for a multitude of reasons. They are forever in the honeymoon phase of their relationship.