The Song of the Rose by K.M. Carroll

A retelling of Beauty and the Beast, but in space.

The human race is at war with the Rox, a ferocious race of horned, demonic humanoids from space, and humanity is losing.

When the humans and Rox agree to a hostage exchange, Lieutenant Zayn is asked to volunteer because of her social standing. She will be housed with a prince of the Rox, and their good behavior will ensure that peace talks will go forward between their races. Zayn is terrified of sharing living space with one of the demons, but she agrees in order to bring about an end to the war.

Alnair l'Nath is a prince and commander in the Rox fleet. He is nervous about being shut in with a human princess who might knife him in the back, but he wants the war to end, too. He and Zayn despise each other on sight, even though Alnair finds her oddly attractive.

Zayn and Alnair gradually make peace as they discover that humans and Rox are not so different. But when a rogue...