An Animagus

Hermione decides to attempt a new spell she read in a book. She's seen it done and wants to test her abilities.The incantation may just be out of her skill set... what happens when she casts the spell and drinks the potion? What happens if someone stumbles upon the ritual?

Read and find out. ;)
I do not own any characters, I only had an idea and wanted to share it with others.