God, he likes Stiles. Even his angry face is wonderful to Derek. He just watches him, openly fond, until Stiles asks the question. He had thought wanting Stiles to stay was a given. He'd just said that. God, he can't believe he said that.

"If you'd like to stay," he says carefully, but now he's not so sure. Maybe Stiles had just wanted to get him in bed so he wouldn't have to deal with him anymore. "It's up to you."