The Hidden Heir by Kai Lesy

The monster who comes to put me underground... forces me to become his wife instead. His brother betrayed me. Then died without ever meeting his son. Luca Moretti, the Devil of Chicago, has come to claim the last Moretti heir. My child. I expect a bullet. Instead, he forces a diamond on my finger. Then moves my son and me into his lakefront mansion. His rules. No way out. So I swear I'll make his life a living hell. Starting with being the worst mafia wife Chicago has ever seen. However, Luca isn't what I expected... He guards my son like his own. Silences anyone who dares look at me wrong. And looks at my curves like they were made for him. He doesn't just want a wife in name... He wants every damn inch of me. And Luca doesn’t believe in happily ever afters. He believes in till death do us part. Apparently, he takes the “death” part very seriously.