Slightly Wicked by Alyssa Clarke

Miss Eleanor Fairbanks is the most sensible of all the sinful Fairbank siblings until she has a chance meeting with the too handsome gambling den owner Lucien Glendevon. Ellie knows that her duty to her family should be more important than her own personal desires. The dowager countess has made it clear that she must help rebuild the family’s reputation by making a respectable match.

Ellie knows she should accept the very suitable offer of marriage from a charming younger son, rather than dream of a man deemed unsuitable by society. Yet with every chance encounter with Lucien and their scandalous stolen kisses, she finds herself courting impropriety with every step and falling dangerously in love with a man she would never be allowed to marry.