Inflict by Bethany-Kris

As the son of an Irish mobster, Connor O’Neil spent his boyhood hiding from the horrors of his own home. His one reprieve was a girl he knew only as Evelyn, but even she was taken away. As a man, Connor is determined to stay away from his father’s business. With Sean, participation is not a request, but a demand. The truth is, Connor might be more like the evil he’s trying to hide away from than he would like to admit.

And he’s already spent years trying to cover the scars left over from the pain.
A chance encounter puts the lost girl from his past back on his path, and he no longer has a choice but to face the darkness he’s been ignoring for years.
Evelyn. Sasha. Slave.
She doesn’t really know who she is anymore.
Or maybe she does, and she doesn’t want to tell.

She isn’t the same as she once was—now a thing to be kept and maintained, shuffled from owner to owner until it was her time to go. She only became Connor’s because he took her when he knew she wasn’t his to take.
Except she isn’t Connor’s at all …
And he can’t keep her hidden forever.