The Forsaken Ones Series by Denna Holm.
Another amazing series by the talented writer, Denna Holm. Book 1 of 2: The Forsaken Ones It’s the year 3015, and humans face extinction, their planet nearly destroyed. Desperate politicians approach demons for help, not understanding the high price to be paid. Normally bound by the summoner’s magic, demons suspect Maggie is key to giving them free access to Earth. Magdalena is a half-breed succubus with a heart. Though raised inside one of the worst brothels in the world, all she wants is to find one man who can love her despite what she is. She wants free of this…