Executive Love by Cassidy James

Mel Huntington has it all – a CEO in her early thirties, with a killer wardrobe, great friends, and a handsome boyfriend in New York.
Mel Huntington is falling apart – someone is sabotaging her at work, her boyfriend is having second thoughts about being with a woman who is more successful than him, and she keeps veering into filthy fantasies about her brother’s best friend, Ethan.
As Mel and Ethan travel from San Francisco to Nashville to Milan via the society wedding of the year, the heat intensifies as the stakes continue to rise – and Mel must decide whether mixing business with pleasure could cause her to lose everything.