The Demon's Mistress: A Novella — Jo Beverley

The Demon's Mistress opens with a bang -- almost. Maria Celestin, known by society as the Golden Lily, a beautiful widow just out of mourning, arrives just in time to stop George, Lord Vandeimen, from taking the coward's way out from under his debts and crumbling estate. Her proposition, that Van act as her affianced for six weeks in exchange for enough money to pay off his creditors and make the most urgent repairs to his home, intrigues him, as does the lady herself. Van suspects that Maria has an ulterior motive for approaching him, but he's willing to deliver whatever her heart desires. And her heart desires Van.