Wicked Little Secret (Boston's Elite)

It was supposed to be an anonymous, one-night stand.

Dr. Olivia Lacroix wasn't proud that she went to the bar when she was ovulating, intending to get pregnant. No last names or phone numbers had to be exchanged—the guy never needed to know. No harm, no foul. Right?
Wrong.
When her one-night stand shows up at the hospital right after she's given birth demanding answers, he’s no longer the nice guy she met in the bar. Not satisfied with her explanation, he insists she marry him or else he's going to sue her for full custody. Olivia has money, but not the kind of money her infant son's father apparently has. She had no idea she'd hooked up with a multi-millionaire.
What else can she do but marry him? Their prenup guarantees her joint custody if he divorces her. That should be easy enough to make happen. If she can keep from falling in love with the grouch first.