His Mistress by Christmas - Victoria Alexander

For three years, Lady Veronica Smithson has been perfectly happy as a widow--and thoroughly independent. Still, the right gentleman could provide the benefits of marriage without the tedious restrictions. And in Sir Sebastian Hadley-Attwater, renowned explorer and rogue, Veronica is sure she has found him.

Sebastian will come into his inheritance in a matter of weeks--if his family deems him responsible enough. There's no better way to prove his maturity than with a wife. But though Veronica will share his bed, she refuses to marry. However, Sebastian has a plan: An intimate sojourn at his new country house will surely change Veronica's mind. For Sebastian never takes no for an answer. And he intends to persuade his Christmas mistress that they belong together--in this, and every season to come.
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"This Victorian yuletide romance provides erotic sizzle and delectably clever dialogue on every page." -USA Today