Daemon's Angel — Sherrilyn Kenyon

Where angels go, love is sure to follow.

THE SAINT
Cast to the mortal realm by an evil sorceress, Arina had more than her share of problems. She was trapped in a temptress's body, tormented by untested passions, and doomed to lose any man she desired. Yet even as Arina yearned for the safety of the pearly gates, she found paradise in the arms of a Norman mercenary.

THE SINNER
The villagers said Daemon was the devil's son, but he was only a man plagued by strange dreams -- visions of a tantalizing beauty who enchanted him like no other. Then the enticing stranger appeared in the flesh, and he vowed nothing between heaven and earth would keep them apart. But to savor the joys of his very own angel, Daemon would have to battle demons--within and without--and risk his very soul for love.