Dark Defender by Madison Savage

Vampires exist. Just not on Earth…

Erin Rose can think of only one way to escape her abusive ex-husband. She sells herself to aliens. More specifically, one alien–a vampire alien.
He’s buying a human woman for two years in his unending quest to find his lifemate. The one who will make his heart beat and give him children. The one to whom he can give immortality.
But she’s not interested in forever. The vampire is just a two-year stop on her way to her new sanctuary and her freedom.
But when Fate steps in, as it often does, and plans go awry, will she get everything she wants, or will she find herself back in the cruel grip of an obsessive man who refuses to let her go?