The Duke's Mistress — Carole Mortimer

The young widow Lady Dorothea Fitzroy is bored with her life. Most especially so with her role as mistress of her brother's household, and the endless round of society engagements this forces her to endure.
What Thea so badly needs is a secret and passionate lover, to become mistress of another kind entirely, and so add excitement and spice into her humdrum life. But where is she to find this handsome and inexhaustible gentleman?
Julian Remington, the arrogant and haughty 17th Duke of Blackmoor has no interest in finding a mistress for his bedroom or his home. He's jaded, cynical, and distrustful when it comes to women. One woman, a woman from his past, has caused too much grief in his life for him to ever trust another.
Thea and Julian are about to be caught up in a passion for each other that blazes so fiercely, and so out of control, it is beyond the power of either of them to resist.

Author's Note: The stories in the Regency Unlaced series are steaming hot and the language sometimes explicit.