Dragon Dad’s Mistress by Amelia Wilson

Running is not an option.

Desperation and anger are constant companions in Marshall’s life now. He is in love more passionately than he thought possible, and his love is at risk. His mate, the woman of his dreams, is carrying his child, and they are in danger from a gang of Griffins.
Harper is stuck in an endless cycle of emotional and physical abuse. She clings to the hope of all of the promises for a family Marshall declares daily. However, as her abuser, the leader of the Griffins, keeps her trapped, she begins to worry those promises will never come true.
Marshall and Harper feel the time they have is running out.
The Griffins run a tight gang.
Retrieving Harper quietly isn’t an option.
If Marshall doesn’t get Harper soon, he’ll declare pack war between the Griffins and Dragons.