There's a War On! 1979, a year out of Hogwarts. Lily and James are not yet married, Peter's not yet turned on his mates. The war is going strong, and paranoia is at an all time high. (
loveavertsevil / Lily,
untamedmutt / Sirius,
raisedbywolf / Remus)
Azkabaning 1993, alternate universe where Lily recognized Peter's cries for help for what they were and got through to him before it was too late. He was already a Death Eater (sorta) but he hadn't turned his friends in yet. In exchange for naming all the Death Eaters he knew and waiving his right to trial, Peter went to Azkaban under the plea bargain that his friends and family would be told he was killed in battle instead. Harry grew up with both his parents and his godfather, but not for lack of trying on Voldemort's part. (Further repercussions of this have not yet been figured.)
Unless stated otherwise, it can be assumed that the Peter that is tagging out is probably from There's a War On!