No Accounting for Love — Megan Frampton

Miss Katherine Grant is a lady's companion, one whose number of dishonorable offers (six) greatly outweigh her honorable ones (zero). Now tasked with making certain her charge, Lady Euphemia, does not contract herself to someone inappropriate, she finds herself inexplicably drawn to Mr. Henry Dawkins, the inappropriate gentleman Lady Euphemia wants to charm, who keeps the books at Madame Follette's. But it seems that Henry only has eyes for Miss Katherine Grant.

Originally published in the Dressed to Kiss anthology.