A Rekindled Attraction (The Ball of Sin series #1)
Ramona Elmes

Lord Bromley has always loved his childhood friend Leonora Walker and was shattered when she married a decade ago. In a shocking turn of events, Leonora is now divorced, and London society has deemed her unsuitable for any proper gentleman. Frustrating Bromley, she is unbothered about the prospect of never marrying again and more interested in playing matchmaker for him.
An unexpected searing kiss between them confirms for Bromley that his feelings aren't one-sided. Unwilling to have anyone but her, he secretly arranges for her to attend the most notorious ball of the season. He has one night to show Leonora that friendship is only the beginning of what exists between them.
*The series is in the same character world as the Nouveau Riche series.