Heart of Decadence by Jenna Jaxon

Miss Amelia Burrowes was the scandal of the ton in her first Season, when her fiancée died and she was declared a ruined woman by Society. Ten years later, she’s back in London to make an arranged marriage that will hopefully allow her sisters to be received by the ton. But when Nathan, Lord Ainsley, the man she’d really had a tendre for all those years ago, renews their acquaintance, the flame between them rekindles and Amelia must convince him that a woman with a past deserves a future.