Billionaire Under the Mistletoe - Carole Mortimer
When kind-hearted Sophie Carter steps in to rescue Christmas for enigmatic billionaire Max Hamilton’s family, she doesn’t anticipate that, after filling their stockings, she will find a present waiting for her under the tree…

Snowed In With Her Boss - Maisey Yates
Amelia Lambert is shocked to be spending Christmas pretending to be her boss Luc Chevalier’s girlfriend. Snowed in together in a five-star Aspen resort, an unexpected chemistry ignites!
Chevalier Brothers Series - Maisey Yates
1) Highest Price to Pay (Blaise Chevalier & Ella)
I think Ella was a secondary character in another Maisey Yates book
2) Snowed in with Her Boss Luc Chevalier & Amelia)

A Diamond for Christmas - Joss Wood
Headstrong Riley’s holiday run-in with hot gemstone tycoon James Moreau is unsettling to say the least. But she soon discovers that the only thing better than resisting temptation is finally giving in!