Naughty and Nice by Mari Carr

One unforgettable night…with the wrong man.
If there’s one thing Liza excels at it’s making bad decisions. Which is why she knew it was stupid to invite the guy she’d just started dating to the gala she was hosting. When he gets overly familiar, she asks him to leave. He refuses…
Until sinfully sexy billionaire, Matt Russo, intervenes, leading to Liza’s worst decision ever. Because a holiday hook-up with Matt, her family’s enemy, would definitely land her on the naughty list for life.

If Matt’s past has taught him anything, it’s that true love doesn’t exist. Then he spies Liza—the only threat to his simple existence—across the hotel ballroom. A slow dance leads to a heated embrace that ends in his hotel room. And for the first time ever, he imagines a very different future for himself.
Unfortunately, it’s one he can never have.