Thats...not going to be an answer that Lan Wangji is going to like to hear. He gives kind of a sheepish grin as he reaches up to rub the side of his nose. "Since I needed to be normal size to get out the door, I just made sure the hall was empty before coming out. And..I was naked so then once the door was shut I changed into a rabbit and it locked behind me."

At the time he thought he was being clever. The lack of a key didn't cross his mind until much later. "Ah..he does! He had to go get one when I was injured. You said I couldn't walk on the ankle so I wasn't sure how to get to the door. So he went and got a new key."