Billionaire's Baby Surprise — Mia Caldwell

Surprise baby for the billionaire!
It was supposed to be one night to celebrate her promotion, a harmless fling with a stranger in a nightclub. Instead, Jake is actually billionaire Wallace Whitcomb Jacobi and her new boss. Their resolve to forget the shared night of passion and behave as aloof professionals soon falls apart under the force of their mutual attraction. Sondra knows the sensible choice is to resign -- not just because she can't keep her hands off her boss, but because the consequences of one night will last nine months and beyond.

This is a novella around 25,000 words with a happy ending and no cliffhangers.