Fearless by Cyndi Friberg

Kelsey's undercover assignment aboard the Fearless blows up in her face when the ship's handsome commander sets his sights on her. They're genetically compatible, which means one thing to a Rodyte male, pursue, seduce and claim his potential mate.
Jakkin didn't set out to bond with a mate, but now that he's found her, he'll do everything in his power to win her heart. It doesn't matter that she's a spy, or that she claims to despise him. He can sense her attraction and smell her arousal. Her words are hurtful and cold, but he has no doubt that her passions burn as brightly as his.
Note to Readers: This book contains detailed descriptions of sizzling passion only suitable for mature readers.
From Cyndi: Battle Born is a fully integrated sci-fi series. Each romance is resolved within the given book, but many plot elements continue on from story to story. For this reason, it's best to read the books in order. Enjoy!