Bloodline Destinies, Book 2, by Iuliana Foos

When destiny offers Theodor De Croix the vampire Prince of the Old Coven a weak, half-dead human, his first reaction is rejection. But one drop of Vivienne’s blood will melt his frozen heart and bring him acceptance.

She belongs to the new subspecies, GeMs, appeared after the Flood, and blood is essential to her survival as much as is for vampires. Yet, her fear of his kind, ambitions, and machinations in their secret society in a post-apocalyptic world, will stand between them.

He will have to break every rule he lived by for five long centuries to save her life and hope she will save his soul in return.