Eternal by Eva Simmons

I made a deal with the devil…

Declan Pierce is a bully and a sadist. He’s been my enemy since birth, and he’s made my life a living hell. But when my father barters me in an arranged marriage, Declan proposes a deal I can’t refuse.
After all, so long as Declan owns my soul, it can’t be sold to another
But it turns out Declan wants more than I bargained for. My body, my submission, the truth behind what sent me to Montgomery Psychiatric Ward three years ago. And he’ll haunt every facet of my existence until he gets it.
I thought death was the only truly inescapable thing. After all, nothing is eternal… except maybe him.