Good and Evil (Rewritten)

Gray and his clan are vampires. Natsu and his clan are werewolves. Gray and Natsu aren't evil but they weren't trying to be good per say, but when a couple of college girls enter their world, they learn that doing nothing isn't the way to go. Now it is time to choose a side. Gruvia, NaLu, Jerza, GaLe, Elfever and other pairings. Supernatural AU.