Dark Cure by Cynthia Sax

A warrior seeking forever faces a medic living in the moment.
Gisella, the Refuge’s medic, is dedicated to her role. She doesn’t have the space in her lifespan for love, a mate, or children. Healing is her entire focus.
But she’s also a female in her prime. She has needs, wants, cravings…especially for a scarred, long-haired barbarian warrior temporarily residing in the settlement. One fierce, soul-blasting, passion-filled encounter is all she is willing to give him before she returns to her duties.
Oghul, a Chamele Warlord’s Second-In-Command, has waited his entire lifespan to find his gerel, the being fated to be his. He’s thrilled to discover she wants him as savagely as he yearns for her.
His little human medic appeals to his primitive possessive side. Greatly. He wants to stamp his ownership all over her bountiful curves, take her back to his home planet, claim his fiery female permanently.
When Carinae E’s solitary sun rises, two determined beings with very different desires find their lifespans entwined. Their battle for emotional supremacy will span systems and alter destinies.
The universe will never be the same.