The Devil’s Game by Sandra Sookoo

He’s heat and sin. She’s ice and proper. Between them, a storm of passion is brewing.

On the shelf Miss Amelia Hasting has no time for frivolity. Companion to a willful nineteen-year-old nouveau riche heiress seeking a match with a titled gentleman, Mia’s only task is steering her charge away from rogues and scoundrels, but when it’s her peace of mind that is threatened by an overly handsome and very wicked viscount, she must do something, and fast, to keep both herself and her charge out of his bed, even if she’s curiously tempted by him.
Rakish Nicholas Devlin, Viscount Wycliffe, is suffering from ennui. Now that the war is over and there’s no need for his smuggling services, he requires a fortune, which means sacrificing himself to parson’s mousetrap with a young woman who has more bosom than brains. Despite his protests, when he meets a stubborn, companion indifferent to his charm, he forgets the heiress into order to knock Amelia from her icy pedestal and discover her fire.