There once lived a young wommon named Cinderella, whose natural birth-mother had died when Cinderella was but a child. A few years after, her father married a widow with two older daughters. Cinderella's mother-of-step treated her very cruelly, and her sisters-of-step made her work very hard, as if she were their own personal unpaid laborer.
One day an invitation arrived at their house. The prince was celebrating his exploitation of the dispossessed and marginalized peasantry by throwing a fancy dress ball. Cinderella's sisters-of-step were very excited to be invited to the palace. They began to plan the expensive clothes they would use to alter and enslave their natural body images to emulate an unrealistic standard of feminine beauty. (It was especially unrealistic in their case, as they were differently visaged enough to stop a dock.) Her mother-of-step also planned to go to the ball, so Cinderella was working harder than a dog (an appropriate if unfortunately speciesest metaphor).