Their Mistletoe Baby Surprise by Rachel A. Andersen

Dahlia Hughes should have taken her unexpected sabbatical anywhere other than her hometown… Or at least, stayed somewhere other than the Mistletoe Ski Resort and Lodge. But when she runs into the man who humiliated her back in high school, she knows she’s made a big mistake.
Literally running into Dahlia was the last thing Marcus Kruger expected. So was the baby he found abandoned in the Lodge’s industrial laundry room. Unfortunately, Marcus needs a social worker, and Dahlia is the only one who can help.
Thrust together taking care of a newborn is not the way either of them expected to spend their December, but this might be their only chance to rewrite one of their most regretful memories and reclaim what might have been…