Dauntless by Kallista Dane

I’m tearing across the galaxy at a hundred times the speed of light. Tomorrow I’ll become the bride of a fierce alien warrior—and I’ve never even kissed a boy.
My mother always told me I was too delicate to play sports, to join clubs, to go away to college, so I studied from home. A childhood illness left me with a weak heart. Even after the doctors said it was strengthened, Mom was too worried to ease her grip on me. She never allowed me to go to a dance or a party or a football game. When mother died after a long illness that took every dime she had, I was left with nowhere to go and a degree in ancient history that offered zero employment opportunities.
My only friend, Inia, who had lived next door since I was a little girl, signed up for the Centauri Brides program and suggested I join her. I’d never even lived in my own apartment, but with few options—no options—I found myself signing up to marry a huge hulking alien, sight unseen. and spend the rest of my life on a newly discovered primeval world.
Kyros
I want at least a dozen children.
My entire family was wiped out when a vicious enemy destroyed Arythios. My father, mother and eight siblings gone as if they’d never existed while I was commanding a team of warriors in charge of security aboard the solport.
Unlike some of the others, I was eager to sign up for a human mate. I requested a strong woman, like my mother was. While waiting for a Bride, I built a home with enough bedrooms for the many children we will bring to this world.
Tomorrow I will claim my chosen Bride. Together we will found a dynasty on Centauri and our descendants will celebrate our union for millennia.