The Duke of Kisses by Darcy Burke

Frances Snowden can hardly believe her good fortune when she’s whisked away from her boring life by her sister who is now a duchess. Instead of becoming the third wife of her parents’ stuffy neighbor, she can be anything she wants: a doting aunt to her newborn niece, a debutante in London, or even an independent spinster. But when she meets and kisses a mysterious man on a walk in the countryside, she knows exactly what she desires—him.
David Langley, Earl of St. Ives, is resigned to marrying the dull woman his parents chose when he was a child. His future is suddenly, and happily, diverted when he encounters a captivating young woman who shows him everything he’s been missing. Ready to embark on a blissful life together, a long-buried feud between their families makes their marriage impossible. Nothing is more important than duty and family, but can he turn his back on love?