Brutal Alien by Luna Kingsley

I hate everyone but her.

Zuvath:
It has been a year since the second transport of humans arrived and trust is in short supply. They keep to the settlement, determined to create their own community without the untrustworthy aliens who got them into this mess. All of them except for Ellen. She breaks the rules for me—sneaking out to hunt together, riding our komoth and even hiding away in secret caves where she lets me touch her secret places.
I want her but no one knows what we get up to when we’re alone. If we were discovered, it could ruin the fragile peace between our kind.

Ellen:
I’ve always been a people pleaser and that personality trait extends to Xavren. The barbarians are my friends but so are the humans. They rely on me. They count on my leadership. If I mated with a barbarian, they would see it as the ultimate betrayal to what we’ve accomplished and what we’re striving toward.
Zuvath has taught me how to survive here. Always the brooding grump, he’s different with me—correcting my bow form when we hunt, watching me closer than he needs to, saving the best pieces of meat for me. Somehow he’s become more important to me than anyone else…and I can’t tell a soul about it.
When we stumble on a foolish plan by the humans, we’ll use our strong bond to try to prevent disaster.