He gives his fox ears a scratch. "I'm worried about Wei Ying all the time. Especially in this place. I always wonder how I can better protect you, when you over-exert yourself."

Those tails makes nice pillows and warm blanket, so Lan Wangji is going to curl up with him with close contact for affection. It would do if Wei Ying isn't in the mood for anything else. Hugs and embraces with his soft fox will keep him warm.