During the summer before sixth year, Harry finds an injured bat in the garden and decides to try to heal it...and an unwilling Snape learns just what kind of a person Harry Potter really is. No slash.

A potions accident leaves Snape as a cat until who-knows-when. Harry’s already got his hands full when a prankster starts sabotaging the rebuilding of Hogwarts. But what if it’s not just a prank?