Harc by Ella Blake

Olivia Fisher is a journalist with big goals and enough guts to accept an assignment that puts her on the base ship of the most notorious alien Saar-king. She sees Harc Gral-Nak as a tyrant who puts his ship and its people above all. Learning that she is his biological mate is as much a surprise as discovering the stern leader’s hidden depths and long-buried kindness. However, someone on his ship doesn’t believe she belongs there, and will go to lengths to eliminate her.
Harc Gral-Nak is paying for his missteps with the humans of Earth by hosting a party of their journalists. The problem is, one of them turn out to be his mate. Harc has known only battle, self-reliance, and old traditions—none of which are useful when dealing with Olivia. As the Baylan fleet falls under attack and new species begin arriving on Earth, Harc must learn to balance his duties to his people and to his human mate, or risk losing them all.