The Rise of the Underworld by Meg Xuemei X

I can’t forgive his betrayal, yet my body answers to his mating call.
The dirty truth about my fourth mate, a demigod druid, cut me bone deep.
To prevent an apocalypse on Earth, he had me kidnapped and taken to the Underworld. There I was raised as a warrior slave and trained to battle the Dark Lord.
I do not care how hard it was for him to send me away, the woman he treasures most. I do not feel sorry that his heart bleeds for me every second of every day. He robbed me of my birthright and the power to carve my own destiny.
I vow never to forgive him, even though he’s finally come to bring me home, even as he fights alongside me with my other immortal lovers.
Yet my body craves his every scorching touch and refuses to deny my destined mate.