Sherrilyn Kenyon: Dragonsworn (The Dark-Hunter World)

Medea was born the granddaughter of the Greek god Apollo, and among the first of his people that he cursed to die. But she will not let anyone rule her life. Not even her notorious grandfather. And when Apollo sends a new plague to destroy what remains of her people, she refuses to standby and watch him take everything she loves from her again. This time, she knows of a secret weapon that can stop the ancient god and his army of demons once and for all. However, said device is in the hands of a dragon who wants nothing to do with politics, the gods, humanity, demons or Greek Apollites - and especially not her