"Oh my god," Stiles said at Derek's words and actions, the feel of Derek's mouth on his neck went straight to his cock which caused it to twitch and harden. The human fumbled out of his wet shorts, having forgotten they were there in wanting to get Derek wet, and he was grateful for the support of the wall when Derek pushed him against it.
"Three," Stiles said, his tilted back and pressing against the shower wall, as Derek licked the water droplets from his skin. "I can get myself to come three times." Stiles had a lot of practice doing so in the last week.