Demons are always thought to be evil and dangerous. But what if "demon" was just a name of a race? What if they weren't evil? What if that was just how humans have thought of them and have persecuted because of how they were born?
Dahlinda was born a demon in a town of humans that HATE demons. She's never known anything but pain and being called a freak. In her heart she's always wanted a family that will love her, but instead she is saddled with a guardian that is more evil than what they call her.
See how I've evolved this into a Sleeping Beauty story. A twisted one at that.