Last Man on Earth - Now in Ebook from Ellora's Cave by Michelle M. Pillow
Dr. Micco Hagan has been charged with pairing up the last of Earth’s survivors based on genetics for optimal survival of the species. He can’t resist the opportunity to be with his dream girl, Rena Gates. Though she rejected him before the Earth ended, he hopes now she’ll find a soft spot for him.
In the time before, Rena thought Micco had only come on to her to win a bet. She never expected them to be rescued together, or to be eventually partnered. Unable to resist following orders, she discovers they have a lot more going for them than DNA matching. The sex is explosive, but can it eventually grow into love?