In the beginning, I was a "wily old serpent" in the Garden of Eden where I met the Aziraphale, who I then happened to bump into around once every centaury. I was assigned to Earth to "make some trouble" which isn't nearly as hard as it sounds, because the humans tend to think up things far worse than I could ever imagine. After some time, the angel and I started a sort of "arrangement", so every now and then I might pop in quick blessing in between temptations, to save him the trouble. 