Withstanding the Enemy by T. L. Mahrt

Emma Andrews was orphaned at a young age with no family to turn to. Tired of the broken foster-care system, and believing it was her only option, she runs to a multi-millionaire with a reputation of hiring young women. It is only then that she learns what real monsters look like…
Emma uses her overactive imagination to help her get through the toughest of days. By daydreaming a life full of love and freewill, she manages her colorless prison, but even in her wildest dreams, she would have never imagined it could become a reality. That is, until she meets Chance, a man willing to lay his life down to save hers.
But what Emma doesn’t expect is to fight her own personal demons—her heart.