Celestial Downfall3 books in series
Fallen to Grace Publisher's Summary
Azrael's a wingless angel, and if that wasn't bad enough, she's the only one with a functioning conscience. Her bi-color eyes mark her as a moral hybrid, and when she breaks her enslavement to Manor Saffron by making a deal with a demon, she doesn't expect to become Queen. She'll have to survive her new royal magic, convince a legion of angels she's worth fighting for, and find the breach in her Faustian deal, or risk a new master with horns.