The Werewolf Enigma

The Golden Trio is attacked by Fenrir Greyback while Horcrux hunting and Harry and Hermione get bitten and fall unconscious. When they wake up, they find themselves twenty years in the past. With the challenge of hiding their origin and their "furry little problem" from the school (except Dumbledore and the Marauder's), can Harry and Hermione survive seventh year?