Stiles gets turned into a werefox child with no memory of anything beyond the age of five (and a half, thank you very much). So when he smells the scent of home and security, naturally he follows it and finds himself face to face (or rather face to knee) with a scowling man (with pretty eyes).

Derek comes back home, but he's not quite himself. Five minutes with Stiles and it's like he never left. (Okay, with one small change.) Tumblr ficlet #4

Derek offers his bed to Stiles when Pack night runs late and everyone is too tired to go home. Stiles tries to kiss Derek's cheek but accidently gets his lips when the man shifts unexpectedly. Derek doesn't react like Stiles expects him to.