Taken and Mated by Samantha Madisen

Katalana Scott has spent years living in hiding from the Imperial Guard, but it is only once she finally boards one of their ships that she learns the truth about herself and why she is so special.
She is an Atrix, one of a select few whose unique genetics offer new hope for the future of many worlds. But the Imperial Guard are not the only ones in the galaxy who are aware of her value…