"Elspeth Potter's DUCAL SERVICE, about a 40 year-old duchess who runs off with the stable boy based on a short story published in THE MILF ANTHOLOGY (Thunder's Mouth Press), to Susan Pezzack at Harlequin Spice, in a nice deal, in a two-book deal, for publication in 2008, by Lori Perkins (World)."
Thanks to Rachel Kramer Bussel for the alert!