The Housekeeper’s Billionaire Boss by Bree Livingston

One holiday.
Two hearts.
And a love language only they understand.
Molly Hines made a promise not to date after she adopted her brother’s baby. It’s been an easy rule to follow until her boss—Josiah West—invites her to spend the holidays with his family so she won’t be alone. She thought he was cute from the moment she met him six months ago. Now, she’s finding out that he’s not just cute, he speaks her language of movie lines and song lyrics.
Six months ago, Josiah West hired Molly after witnessing the cute barista getting fired. When her babysitter shows up at his apartment with Molly’s new infant, he finds out she’ll be spending the holidays alone. On a whim, he invites her home—a baby needs to be surrounded by family, right?
That old holiday magic is in the air, and these two square pegs find that it’s hard to fight it when they fit together so well.