Vaka by Keira Conrad

He claimed her body…now he wants her heart.

Callie is a survivor. Her mom’s abandonment taught her you can only count on yourself, and the rest of her crappy childhood taught her to get back up when life knocks you down. It’s why she’s chosen as one of the first space colonists to settle a new planet. And why she’s willing to step up when they reach their destination and things go horribly wrong.
Vaka, a warrior and dragon shifter, usually solves his problems by lighting them on fire or tearing them to shreds. But not this time. His people are dying out. The females of breeding age are gone. He can’t do a damn thing about it – until the answer to his prayers crash lands on his planet.
He proposes a scandalous trade, and Callie is just desperate enough to accept. The consequences will shock them both.