Outcast's Alley / by RhiannanT (PG-15)

Title: Outcast's Alley
Author: RhiannanT 
Fandom: Harry Potter
Pairing: Harry/OC (sort of)
Genre: AU, Magical Culture, Creature!fic, Political
Length: Long (Words: 104,860)

Author's Summary:
When Harry goes through some changes the summer before his Fifth year, his relatives don't react well. Suddenly Harry finds himself homeless and alone, and learning to cope with yet another whole new world he'd never known existed. creature, royalty

Review:
Another HP classic, this is a great world-building fic.  It goes into a lot of interspecies politics and there's more about Diagon and Knockturn Alleys.  It uses a lot of common HP fanfic tropes - the summertime creature transformation, in particular.  I like the slight twist on the magical lifemate trope though - that suddenly someone just turns up out of the blue trusting you completely and then dies... not how it usually goes and it's an interesting take.

Outcast's Alley (on ff.net)

There is also an abandoned sequel - Bastard Prince (on ff.net)