Looking for a historical anal training story.

[ANnon82]

Does anyone know of a story in a historical setting, likely the Victorian or Edwardian age that is about two girls or young ladies, one of whom in the older sister of the other, who are taken in as wards by a godfather or old family friend/benefactor at his county estate and while there are put through anal training by him.

As I recall the older sister is the primary point of view character. Also I remember one scene in which one of the girls is bound to an ottoman/footstool while being stretched by toys or something like that.