Until now, I've generally only read stories on FFN. Probably because I find it the most convenient, and have problems/biases against other major sites (such as AO3's horrible tagging system). The only well-written, non-FFN fic I can think of that I've read is The Very Secret Diary by Arabella. If you guys could recommend me good stories on other sites that I should read, I would appreciate it very much.

I generally can tolerate most pairings and genres, as long as they're realistic and well-written, so feel free to post a variety of stories

 

Island of Fire by esama comes to mind. It's in the DLP Library.

 

If you haven't read The Shoebox Project, you should. It's a classic for a damn good reason.

Similarly, see Full Pensieve's archives, in particular Years of Rebellion and Last Horcrux.