He ruined her reputation---now he's the only one who can save it.
For exactly one season, Lady Charlotte Wentworth played the biddable female the ton expected---and all it got her was society's mockery and derision. Now she's determined to be in charge of her own future. So when an unwanted suitor tries to manipulate her into an engagement, she has a plan. He can't claim to be her fiancé if she's engaged to someone else. Even if it means asking for help from the last man she would ever marry.
Ethan, Lord Amesbury, made a lot of mistakes, but the one he regrets the most is ruining Lady Charlotte's reputation. He's older and wiser now, but his attraction to Lottie never wavered. Going along with her charade is the least he can do to clean the slate and perhaps earn her forgiveness. And, if he's lucky, her love.