Yuletide Greetings (BDSM Holiday Romance) (Taboo Wishes Series, Book Three) by Brynn Paulin

Zach Colvin never believed in Santa Claus, so filling in as Santa at the mall for one of his friends is not making his holiday bright. He’s supposed to be on vacation, not working. When his brother promises to send him a package full of holiday cheer, he never expected it to be a near-naked woman.

Kate Morgan has made a mistake. After many emails, she’s meeting a man for a near-anonymous hook up, but she's stunned to find a different man opening the front door—a man with a determined grin, mesmerizing eyes, and a naughty penchant for spanking.