Deviant Prince by Claire C. Riley

Heavy is the head that wears the Bratva crown.
Alexander Vasiliev carries the burden of his family’s legacy, and his life must follow a singular path: become his father; king of the four major criminal cells in the city.
A Pakhan.
The Boss.
The godfather of the Russian underworld.
Fierce ruler with a keen sense of business and unwavering brutality.
His life is a cocktail of blood, death, and money.
But the weight of royalty goes hand in hand with certain pleasures, and Alexander is an alpha with an appetite.
He has everything he could desire. And more.
Until he meets her.
Marisha Zolotov.
She’s off limits.
She’s married to one of his father’s powerful business associates.
She’s forbidden.
But that doesn’t mean Alexander will take no for an answer.
He’s used to getting what he wants, and he isn’t about to let her marriage get in his way.