Guardian Angels, and Guardian Demons. Mortals were given one or the other, depending on how their life was laid out.

You were a Guardian Angel, busily protecting the woman you were sent to watch. However, a rival demon of yours named Simon, was in charge of protecting the man your mortal fell in love with.

“Careful, you may dirty your gown.” Simon shot as you touched down on the ground behind your mortal, who was on a date, wings folding on your back.