Defiant by Cyndi Friberg

Rivals, enemies, lovers, Jenna and Drex are soon all three. She wants him, nearly as much as she resents him, so how can they ever hope to build a future together? Jenna has good reason to despise all Rodytes, but that doesn't keep her from longing for Drex, thinking of him night and day, and finding incredible pleasure every time they touch. Still, happily ever after is built on trust, and Jenna will never trust a Rodyte.
Drex is determined to prove to Jenna that he is different. He never expected to find a mate, so he refuses to let her slip away. He will court her with ruthless patience, wear down her emotional defenses until she understands that she is the most important person in the universe to him. But hostilities between humans and the battle born are rapidly escalating and the couple keeps getting caught in the middle. Can they overcome their pasts and focus on the future or will the conflict consume their love?
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!