Madam Martinique

Madam Martinique is the head mistress of the finishing school which bears her name. While outwardly appearing as supporting petticoat discipline to parents who bring their sons to her school, once she's rescued children from such parents, she brings them into an environment where they can decide if they're girls, boys, or any other gender.

Stories about Madam Martinique's Finishing School can be found both at Big Closet Top Shelf and Fictionmania.