This story is on FF and is a WIP. I just read all the chapters that have been posted so far (26).
The Changer by
Vingilot Harry Potter has been missing since he was eight. Now, seven years later, Severus Snape has a one night stand that just doesn’t seem to end. How long will they be able to keep their secrets? HPSS
Harry Potter - Fiction Rated: M - English - Action/Adventure/Romance - Chapters: 26 - Words: 59117 - Reviews: 1996 - Updated: 10-10-06 - Published: 2-23-06
Harry, known as London, is a month from being 15 when Severus sees him dancing in a muggle club. The wizarding world has been looking for Harry, but is getting ready to declare him dead. Harry covers his scar and Severus just sees him as a sexy young man that he beds. Harry smokes, swears, but tries to keep his homeless friends safe, as well. Wizarding world finds out he's alive and Dumbledore wants him to come to Hogwarts. Harry only agrees if he doesn't have to attend classes (he can't read but doesn't want anyone to know)and can live/sleep with Severus. No one, but Harry and Severus, likes the idea, but they agree. Harry knows magic, but his is unconventional (can't make a wand work-but is more powerful than the others). I think this is a really good story. It has a lot of funny moments with Harry's language and actions in front of the teachers and school children.