A Boy in Wolf's Clothing

Stiles doesn’t really understand what’s going on any more because Derek is Derek and Stiles is Stiles and they’ve always been separate, even though they’re technically mated now, and he doesn’t know when they were expected to become 'Derek and Stiles' the unit. He doesn’t know when Derek wanted to become that, because even though Stiles is at college now and he’s grown out his buzz cut and started working out every Thursday, he’s still Stiles Stilinski, the kid who’s about as co-ordinated as a peace march in Israel, and Derek is still Derek Hale, he of the cheekbones and perpetual sex-hair and brooding looks.

Or, five times Stiles turns to the wolf for Halloween, and one time the wolf turns to him.