Bound to You by Alyson Caraway

Coriel is determined to rid the world of demons and prove she has what it takes to be archangel. But when a fierce battle ends in tragedy on her orders, she is banished from the Heavens—and finds herself at the mercy of Hell’s sexiest and most powerful demon knight.
He’s the demon knight who wants her
Rather than take his rightful place on Hell’s throne, Zagan prefers to spend his days in the human realm corrupting souls—and he’ll end the life of any angel who tries to stop him. But rather than slay the beautiful battle angel when he has the chance, he binds her to him with his life-saving kiss, forcing her to obey his every command.
The line is drawn
Coriel has no choice but to submit to her captor, though the curse of his kiss is not what lures her to him. While Zagan takes great pleasure in exerting his dominance over the Heavens’ fiercest warrior, he soon wants her to do more than just his bidding. As the war between angels and demons rages, he wants her by his side … to rule Hell as his queen.