Mean big sisters, Winnie and Bubbles, are picking on their little step-sister, Apple. They corner her in the playroom, teasing her as they remove her clothes. Apple is getting very upset, but she's not strong enough resist as her wrists are restrained and an embarrassingly pink diaper is unfolded in front of her. Poor little Apple cries and begs, but her sisters only laugh as they spank, powder and diaper her bottom. Not quite done, Winnie and Bubbles Apple's legs apart with a spreader-bar, and use a magic wand to make their "baby" step-sister cum in her new diaper.