Showing Promise Me Heaven by Connie Brockway

Lady Catherine “Cat” Sinclair will do whatever necessary to save her family from financial ruin—including marrying the ton’s most eligible bachelor for money. Lacking the skills to seduce the rich lord, Cat seeks out a legendary rake to school her in the art of desire. But when she finally tracks down Thomas Montrose—now retired—she dismisses him as “over the hill.”

Once a rake of mythic notoriety, Thomas is happy to forget his dissolute past and tend his country estate, until, that is, his peace is disrupted by a charming and infuriatingly dismissive miss. While he may no longer seduce women, he has certainly not forgotten how to make them surrender to his charms…and he’s only too happy to prove Cat wrong. So the master seducer promises to teach her his scandalous secrets

But Thomas never dreams his beautiful student could send him to the edge of temptation…or that witnessing her dazzle every lord who crosses her path would make him insanely jealous. Now he must act quickly—and overcome the secrets of his past—before he loses forever the woman to whom he’s already lost his heart.