Black Star by Marteeka Karland

A love beyond time — and space.
When the woman known as the Black Star Princess falls into the hands of enemy ship captain Mikiel, they discover a love that brings them together, along with the crews of their cyborg vessels. And they uncover the long-ago betrayal that condemned lovers Nani and Darian to endless servitude as the heart of those vessels.
The events that condemned Nani and Darian to a living hell have inextricably bound together everyone they hold dear. They’ll do whatever it takes to find one another in the vast reaches of space — and to unite their peoples. But as more and more trusted friends are revealed complicit in their long-ago betrayal, it seems there’s no one they can trust — but each other. Is what they had so long ago still strong enough to heal the rift that threatens to tear their home worlds apart?