Stargazer

AU. There is no Boy-Who-Lived; Albus Dumbledore defeated Voldemort. Harry grows up as an ordinary boy—a very ordinary boy, with barely more magic than a Squib. He sets out to prove himself, but in private, because he doesn't want to see the disappointment in everyone's eyes if he fails. HPSS, building from a mentor relationship with Snape. Eight parts. COMPLETE.