Ack, sorry for taking so long to reply, but my sister's home visiting this weekend, so I've been a bit busy. Anyways, I have a couple of recs for you, but it's worth mentioning that the ones I like best that I can think of off the top of my head are long alternate versions of what's happening in canon. One's a completely different fifth year, and the other is a complete AU of everything, which pushes a relationship between Sirius and Remus, though it's not the forefront of the story.

Perhaps I should just email you the link for the first, but the second I mention is "Stealing Harry" and the subsequent sequels... they're seriously amazing. It's at sam_storyteller and it's great. It gives different secondary characters a chance to grow.