Harry Potter and Hermione Granger: Animagus Unleashed

Harry escapes from the Dursleys (prehogwarts) by means of an accidental animagus transformation. He becomes a pet and confidant of Hermione and manages to induce a similar animagus transformation in her. The next surprise for the Grangers is the address on the second Hogwarts letter of Harry Potter, Cat mat on the floor, second bedroom to the left upstairs.