Here is a book I've been waiting to read for so long, I can't hold myself anymore.
Here's the story of the book, please note that this is from the author website =)
For Nikki Donovan, being a teenager can be hell. Literally.
As if trying to fit in at a new school and navigating the social scene isn't enough stress for her, sixteen-year-old Nikki Donovan just found out that her long-lost father is, in fact, the demon king of the Shadowlands' the world that separates and protects ours from the Underworld. When she is brought there by the mysterious (and surprisingly cute) messenger Michael, she learns that her father is dying, and that he wants her to assume the throne. To complicate matters, a war is brewing between the Shadowlands and the Underworld, her half-demon qualities are manifesting, and her growing feelings for Michael are forbidden. Ruling a kingdom, navigating a secret crush, and still making it home by curfew - what's a teenage demon princess to do?
You can read the first 2 chapters here.
(just scroll down a bit, it's below the description)