Their Brazen Countess (Lustful Lords, Book 6) - Lustful Lords, #6

Long ago, she had to walk away from a secret love. Just as she's determined to renew those bonds a new threat may drive them apart forever. Louisa Marie Houghton is more bluestocking than bell-of-the-ball. But her parents have social climbing plans that include marrying her off for a title. She thinks her problems might be solved when she stumbles upon two handsome gentlemen in the woods around her home. Linc and Arthur are new friends retiring to the country to give the latter a respite from the bad influences of London society.
And finding a forest sprite who stirs their darkest desires-only to lose her as suddenly as they find her? Not part of their plan, but at least they have each other when it all falls apart. Five Years later, she walks back into their lives. But no sooner than they rekindle their connection, a new threat emerges that may threaten to unravel everything they've waited so long for. Will they lose their forest sprite once again? Or can love prevail?