Blood Ties — Cathryn Fox

Dari believes she has a genetic blood disorder that prevents her from aging. Her sheltered life is lonely except for the mystery man who enters her nightmares, soothing them into erotic dreams. Mikel has one mission: to protect Dari, who doesn't have a rare disease. Like himself, she is part human, part vampire. Now the alien vampires who created their kind are back to take control of her womb. To defeat them, Mikel and Dari must join as one mind, body, blood and soul.