Darker Shades (House of Skin #0.5)
Charlotte E. Hart, Rachel De Lune

I know that better than most men, but I never understood its true face until I let them in my club and struck a deal. The Cortez brothers brought money and allegiance. All I had to do was agree and do as I was told. But Cortez was a monster I hadn't fully understood. And I wasn't prepared for one of the girls. She was spice and ire. Attitude and fire. With a body to kill for.
Yeah, my conscience got involved.
Or maybe it was my heart