Calamity by Nikki Riker

With Calamity haunted by his past and gang relationships unravelling, will Penny be able to save Calamity from himself? And has she found love in the place she’d least expect it?
Calamity Gardel is the ruthless head of the Calamity Kings gang. Enraged at the Cruz family for running off with his daughter, he’s close to breaking their treaty and starting all-out war. Penelope “Penny” Cruz is a fiery girl who knows how to get what she wants. She secretly helps rehabilitate girls and get them out of the sex trade.

When two of her newest girls disappear, Penny fears the worst. Crossing into King territory and faced with the powerful and intimidating Calamity, Penny makes a deal with the devil – to sell her body in exchange for the girls’ freedom.
But Calamity won’t let her go so easily. This is his chance to exact revenge on the Cruz family. But soon, something happens that Calamity fears – he begins to develop feelings for her.