Captivated by the Wallflower — Aileen Fish

Adam Lumley, Viscount Knightwick, desperately wants o breed one of his mares to a stallion owned by the Earl of Huntfield. Huntfield sees no reason to improve the stock of his competition and repeatedly turns down whatever sum Knightwick offers.
After giving up hope his wallflower daughter will ever find a husband, Lord Huntfield settles on a deal: if Knightwick can turn Lady Susan into a diamond of the Season, Knightwick can breed his mare as he wishes.

Lady Susan Yarwood truly enjoys London assemblies. Where else can she find so many potential sponsors for the school she wishes to establish for the poor children in Huntfield? With her father threatening this will be her final London Season, she must work quickly to secure the funding she needs. The last thing she needs is the interference of the handsome, flirtatious Lord Knightwick who continually draws her away from the matrons she seeks donations from. She will succeed in founding her school, no matter who stands in her way.