Sonny's home

When Dean is sent to Sonny's Boys home by one pissed off John Winchester, he meets a strange kid seemingly unwilling to open up. But he refuses to stop hunting, even in his situation, and Castiel is swept into the world of a hunter, which he realizes he may have a bigger part in than he thought.

or

a teenage destiel AU where Castiel is a permanent member of the boy's home when Dean shows up.