I'll use her for my revenge.
I force an arrangement: If Heather becomes a sensual gift for my enemy, I will keep her sister safe. I train Heather to become the perfect toy. Each day, she learns that I'm as dangerous to her as the enemy. And each night, her submissive nature captivates me. She's supposed to be an expendable gift, and yet the more I train her, the more I want to keep her locked in my chains. But revenge is all that matters. In the end, I will conquer my enemy, even if that means sacrificing my toy.
Author's Note:
This dark romance follows an assassin and a submissive heroine. It contains disturbing content. Reader discretion is advised.