I know I've read heaps of them, but I can never recall names or authors. :( There was a great one that was something like: "Stiles' father tells him to invite for breakfast the man who's been sneaking into his bedroom every night." Cue the awkward. Hopefully the finders community will help?

I found stories by clicking on the AO3 Derek\Stiles tag, and ordering by hit count. That was in October, though, so presumably the top stories I read then aren't necessarily the same....