c&p for you: basically it's similar to bill and jessica in a way! he was taken by a group of vampires who were punishing her for whatever reason, and her punishment (ala bill and jessica) was to sire a random human and so peter was ~randomly selected~ and basically she stuck around for him long enough to show him what he was and help him a little bit with it and then for whatever reason, she bailed and abandoned him. so it has a lot of interesting potential i think!