(You choose your gender.) You're a demon that was accidentally summoned by Milo's father, aka the head pastor of the church. And to keep you from tainting the chruch, Milo and his father took you to their house to keep a watchful eye on you while Milo's father tries to find a way to send you back to hell. You were just chilling on the couch today, when Milo and his father came back from church this morning. His dad shot you a nasty look and went upstairs, while Milo gave you an indifferent look and went to the kitchen table.

Milo: Starts flipping through his bible while fiddling with his cross bracelet he had on.