Willed to the Enemy - Nikki Rose

Book 1 in the Venturi Mafia Series
Mia Montecelli has little time to mourn her father's death before she must take his place as head of the Montecelli crime family. While attending the reading of his will, she finds that her father included conditions to her inheritance. She must marry the heir to the Venturi family, or forfeit half of her father's legacy. But Giovanni Venturi isn't the type of man Mia saw herself marrying. He's irresponsible, selfish, and cruel. And what's worse, she has a history with his brother.
Matteo Venturi puts family above all else. As the devoted son, and consigliere to his father and don, his life consists of covering for his reckless older brother and doing whatever is needed to help the family. But Teo never expected his future sister-in-law to be the mystery girl he'd fallen for five years before. Feelings reignite every time Mia is near as Teo fights for the strength to push away the only girl he's ever truly...