The Billionaire’s Bed by Eileen Cruz Coleman

Determined to impress his ex-girlfriend, billionaire tech investor Fin Bradley decides to throw a grand, Gatsby-style party, at his mansion in Long Island, New York.
His plan is to win back Kelly, the woman who broke his heart years ago, and make her realize how wrong she was for dumping him when he was broke and down on his luck.
The guests arrive on time and soon the soiree is in full swing, and Fin feels confident the night will end according to plan. But that plan changes when he starts falling for Maria, his household personal assistant. Before the night ends, Fin will need to decide to whom his heart really belongs and who should join him in the billionaire’s bed.