DRARRY. Harry is confused by Draco avoiding him, then something weird happens and he has cat ears and a tail! Should Harry follow his feline instincts, or ignore the meowvoulous feline inside when he's near Draco? (Im sorry about the puns, I can never resist)
A potion mishap causes Harry Potter to slowly turn into a maid neko. Shock collar, maid outfit, cat ears and tail and all. Worst of all, the only way to turn back is for Draco Malfoy to kiss Harry before the transformation is complete, in a month, and for both of them to sincerely wish for Harry to turn human again.
This is set in Remus and Sirius's seventh year in Hogwarts. It's everything started before Voldemort murdered Lily and James. And before Sirius was sent to Azkaban under false pretenses.