Santa's Secret Shopper by Vivianna Waters

Stella Vixes adores the art of gift-giving. When people mention the importance of love languages, hers has always been providing the people she cares about with the perfect gift. It might seem easy, but finding the perfect present takes both copious amounts of time and a keen attention to detail. Luckily, she found the perfect job as a personal shopper. The only setback is her terribly handsome, but totally cocky grump of a boss.
Niko Havenstorm has no time for frills. He's all about the deals he can make and the profits he can create for his multi-million dollar hotel empire. Of course, that's not even counting his new venture into airlines. The last thing he cares about is gifts. Can't he just write a check? Unfortunately, he shares his jaded feelings with his personal shopper and foils a perfectly fun party.
Stella decides to prove Niko wrong by going on strike just in time for the gift-giving busy season. The duo make a deal that Niko must survive the holiday season alone or double Stella's pay. Of course, the season gets off to a rocky start when Niko accidently orders lingerie for his top investor.

A holiday romance with a happily ever after. Enemies to lovers. Boss and office romance.

Warning: Intended for mature audience.