Where Clouds Roll By
LJ Prompt: Derek gets de-aged, physically *and* mentally, and immediately gravitates towards Stiles instead of his pack. Why? Because he can sense that everyone else (Scott, Erica, Boyd, Isaac, etc.) is a werewolf (or were-something, in Jackson's case), and his family taught him not to trust unfamiliar weres when he was on his own. He can also sense that Allison's a Hunter or connected to them somehow, (maybe she smells like wolfsbane? w/e). So Stiles ends up having to take care of him until he's back to normal. In the meantime, bb!Derek gets very protective of Stiles, and adorable shenanigans ensue.
Gen is fine, but bonus points for Derek/Stiles either happening as a result if they weren't already in some kind of relationship.