Crath by Laurann Dohner

Since being betrayed by her home planet, Kelsey Bowen has been sold at auction as a human incubator. Until she’s rescued by a feline alien who claims to want to marry her. He’s got to be crazy, right?
Since joining the crew of The Vorge, Tryleskian male Crath Vellar wants what his family has—a human life-lock. His littermates and cousin are very happy with the Earth females they’ve rescued and claimed, and after a lifetime alone, Crath wants someone to call his own. He’ll just have to make sure she survives long enough to give him a chance to win her heart. Not an easy task, when other alien males also want his Kelsey.