Since the HBP is starting in two weeks I've been looking for some HP stories.
This one I found in a comment over at
Snarry Fic Find.
Obviously it's Snape/Harry and I haven't read all of it, just the first five chapters. It seems quite promising. It's complete.
The Apple Tree by Philo Summary:
Harry returns for his seventh year determined to change the status quo. A long (but completed!) tale of romance, betrayal, initiative and derring do!
Edit: So, three days later I just finished this wonderful story. Harry meets Severus some night before the school year starts, they're having a hot night together and start a relationship soon after. But Harry is wearing some sort of glamour and Sev is not aware who he's with.
It's definitly worth reading again.