The Change a Diary can Make

The combination of a werewolf, ex-convict playboy, skilled mischeivious Dark witch, and a Horcrux of a psychotic Dark Wizard is never a good thing. Especially for their enemies. This is finished, just so you know. It's a sort-of teaser/one-shot. I don't mind if anyone uses it as a basis for a new story. Disclaimer: I do not own Harry Potter, J.K. Rowling does. Unfortunately.