◊ Mysterious Animagus ◊

Everyone with basic knowledge on the subject knows that one's Animagus form represents their inner animal, their soul's animal form.
So, what happens when Harry Potter discovers that he has the same form as someone else inside of Hogwarts?
Hoping to get to know someone with a similar mindset, the fifteen year old tries to discover their identity.

WARNING: AU, Snarry, underage relationship (since Harry is fifteen), slight dom/sub.