"Thank god," Stiles mumbled, after deciding that Derek was going to leave him alone. To his credit, he did attempt to be as quiet as humanly possible as he finished up. Humanly possible.

He did come down the stairs a few minutes later, wearing a pair of his own gym shorts he left around and one of Derek's shirts. "I don't know about you, but I feel awesome."

Deal with him masturbating in your shower, Derek. Just deal with it.