The mean Coldly ruthless and deeply cynical, Apollo Metraxis from "The Italian's Christmas Child" has to get married, and produce an heir, within the next 5 years.
The obvious choice is Holly's bff Pixie. Pixie and Apollo hate/despise/lust for each other. He blackmails/coerces her into a temporary marriage.

If you read the first book ... read this one, that's all you need to know.
Christmas with a Tycoon - Lynne Graham
1) ♡Italian's Christmas Child (Vito Sorrentino Zaffari & Holly Cleaver)
2) ♡Greek's Christmas Bride (Apollo Metraxis & Pixie Robinson)

The synopsis below contains too many spoilers.

Again, reading the below synopsis? Huge Spoiler Alert!!
-D

Coldly ruthless and deeply cynical, Apollo Metraxis has made a career of bachelorhood. But when the inheritance of his father's estate is conditional on a marriage and a child, he is forced to do the unthinkable!
Unpolished Pixie Robinson is the world's worst choice of a wife for Apollo. Yet her family's mounting debts leave her defenseless and therefore uniquely suitable. But when the wedding night exposes Pixie's untouched vulnerability, striking a chord in the dark reaches of his heart, Apollo is forced to think again.

(●spoiler alert●)

And that's before he discovers that she's carrying not one but two Metraxis heirs!