Vax

Every now and then, a human will catch a demon's interest. Maybe it's boredom and they use them to pass the time. Maybe they act as a useful pawn. Maybe a spider is enemies with a butterfly.

Whatever the true reason, Vax picked out Syeven.
As long as Syeven steals and does everything Vax says, he will make sure his sister is taken care of.

The Butterfly Coven are strongly against Vax and curse his human to be useless.