Sin's Daughter (Otherkin #0.5)

Cursed with immortality, driven into a nomadic life on the fringes of society to escape those who hunt her, Amber Hale has learned the bitter lesson that she can never grow close to anyone. Never love.

Only once did she break her own rules. And her lover, Kai Warin, paid for her mistake with his life. For decades, she's been numb with grief. Now, confronted by a soul reaper--an agent of one of the most powerful of the Underworld deities--with Kai's face, she must acknowledge the likelihood that he betrayed her...to the Lord of Evil himself.

Forced into an uneasy alliance and plagued by the unwanted yearning between them, they must work together to elude the dark forces hunting them both...

"Watch for Eve Silver's hotly anticipated Otherkin trilogy SINS OF THE HEART, SINS OF THE SOUL, and SINS OF THE FLESH, for more tales of forbidden alliances and inescapable desires."