Devin was a normal man, cubicle worker, paper pusher. Then he became possessed by a Gluttony Demon. Things changed. Devin the Demon then wandered the Southern US, looking for new kinds of hunger, new kinds of things to eat.
During the events of Accord I, Devin temporarily joined the New Orleans' Accord group in an attempt to get closer to Johnathan Simard, whose hunger was uniquely pleasing to Devin. In the end, the group tried to kill Simard, and Devin attempted to defend him by releasing itself from Devin's mortal body, though ultimately it was crushed by the imploded house. Losing its host, the demon was sent back to Hell. It awaits a new potential host, preferably something among vampires.