Bridesmaid by Chance by Meghan Quinn

When a chance at being a bridesmaid turns into a chance at being a bride, how can she possibly refuse?

Hudson Hopper is in some trouble. After doing his business partner, Jude, a favor by hiring Jude's younger sister, Sloane, Hudson very quickly finds out that she is a massive distraction—especially since she's now his assistant.

But when they are confronted with a situation where Sloane is told to fill in as a bridesmaid for one of Hudson's business partners, she comes up with a trade. She'll be a part of the regency wedding—corset and all—if Hudson marries her in return. Sloane knows the value of the trade: he needs her, and she needs his wedding ring to get her into a high-society club that will further her career.

It's an instant no from Hudson at first, but when she convinces him that no one will find out, including her brother, and that he will benefit from the marriage, too…well, Hudson might just find himself saying "I do."