Vital Struggle and the Devil's Dominion (Devil's Dominion #3)
Christina B. Rose

The only problem now is that I’m not sure I want that future anymore.
Cas: I’m not sure what I want at I’m not built for this. She’s always been my obsession - my only vice. So I watch her. Even as I solidify my alliances, I’m plagued with thoughts of her. I need to bend her and push her. I can make her understand, I’m certain. She’s mine, and she knows it. We both know it.
But I can wait. I know she wants to make the decision. I just hope she doesn’t make the wrong one.