Naomi and her step sister Lizzy have just returned home from the movies, when they discover that their parents seemed to have gotten carried away with their fun and left their kinky bondage box room. Lizzy hasn't the slightest clue what it is, nor what it's used for and Naomi explains that she's seen their step-mom sitting on their step-dad with him trapped underneath her before! Naomi smiles widely, convincing her naive step-sister that she should let her try it out on Lizzy; especially if Lizzy desires to hang out more with her pretty, popular step sister. Lizzy agrees and finds herself soon regretting the decision as she squirms and struggles underneath the weight of Naomi's crushing ass and pinning pussy.