Sirius's Student

Hermione gets bored one summer and longs to learn how to become an Animagus. Thus, she seeks out the best Animagus: Sirius Black. Sirius agrees to teach her with a few conditions in mind and they strike up a bargain that will change the fate of the Wizarding World forever! Severe AU, Hermione/Sirius, Harry/Susan, Ron/Lavender, Smut/Lemons, Swearing, Character-bashing, Mature