Impulses — Elayne S. Venton

Nadenka is tired of being the key to her species' survival. She has no control over her life. When a Human visitor arrives on Brondite, she intends to escape on his ship, but the Hunger claims her first. Overcome by the wild impulse to mate, she sinks her fangs into the stranger and succumbs to an intense longing she's never experienced before.

Nadenka's unexpected desire unleashes hidden cravings that challenge Darwin's professional ethics. Interspecies relations are forbidden. No exceptions, no matter how strong the temptation. If he succumbs to her lure, he will lose everything he's worked so hard to build. But if he doesn't mate with her, the cost may be her life.