Their Broken Vessel by Lizzy Bequin

Three brutal alien warriors.
One broken human mate.
Back on Earth, I was just a small time criminal. A loner who never needed help from anyone. Especially not from a man. But I’m not on Earth anymore. This is Terramara. A hellish planet of black deserts and poison air. A helpless little human like me doesn’t stand a chance.
Enter the aliens.
Three brutal blue-skinned warriors with glowing eyes and razor-sharp horns. Their musclebound bodies have been honed by eons of evolution to serve two primal functions. The first function is killing.
The second is…unspeakable.
The aliens have the power to keep me alive. The key to my salvation lies within their dominating biology. But if I want them to save me, I’ll have to surrender myself to the monsters, body and soul.