Derek is pretty sure Stiles doesn't look dumb, at least not with his cheeks flushed in they manner the seem to be constantly, regardless of whether he's a werewolf or not. The teen's body against his own is also incredibly alluring and after a moment he clues into what it was Stiles wanted him to do as well.

"I have lube," he mumbles after a moment, though he honestly wouldn't mind taking Stiles like this either.