He doesn't like that Lan Wangji is right, but he has to deal with it because there are consequences that Lan Wangji doesn't want to find himself in again. He'll defend Wei Ying to the death if he has to, but he doesn't want to be stuck in that position.

"For now," he says, because he knows that Wei Ying won't accept more compromise than that. That he's accepting this much is a matter of influence on Lan Wangji's part.

He reaches over and takes Wei Ying by the sleeve. Now that they're already out here, does Wei Ying wish to explore more?