Heat Rising - City of Hope, #1

Escaping a war-ravaged Earth, Mesa Adair has made her home miles below the surface of Aleucia in the underground city of Hope. But salvation comes at a price. Her life is no longer her own, her every move monitored, and her freedom limited by the alien warriors who rescued humanity from their dying planet. The only bright spot in her new reality is her position as a personal assistant to the most powerful male in the city, but even that is about to come to an end. From the moment the raven-haired beauty stepped into his office, Director Raxcor Wyeth knew he had to have her.
The more she challenges him, the more he wants her, but lately, something has changed. She's distracted, guarded, and when she requests a transfer to a different level of the city, he knows he'll do anything to keep her, anything to protect her. Mesa might be human, but she belongs to him-whether she realizes it yet or not.