Infernal Sin by Ariana Nash

An angel and a demon fell in love, and the world went to war…

Branded a traitor by his own kind, Severn knows winning demons back will not be easy, but when High Lord Luxen steals Mikhail from his grasp, he has no choice. He’s going to need all the help he can get to find Mikhail, unseat Luxen as High Lord, and build a force to rival the vicious Guardian Angel Remiel’s. Or every last demon will die when the guardian descends on London.
Weakened by his treatment in Haven, Mikhail finds himself at the mercy of the demon High Lord. A sly, powerful concubi demon, Luxen is able to manipulate the minds and hearts of those around him. Including Mikhail’s. Is Mikhail’s love for Severn strong enough to withstand Luxen’s charm? Or will he break, unleashing an ancient god’s terrible vengeance upon them all?
As the lies of the ancient past come crumbling down, Severn and Mikhail must harness their differences and unite two warring races. They must fight for truth and for love, together. Or all of London will fall.