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Your stepsis catches you spying on her while she is masturbating! She is shocked and decides that you deserve to be punished! She commands you to get your cock out. She is unimpressed. She then tells you to go into the drawer behind you and get out the shiny metal chastity cage that she has. She dominates you and orders you to put it on your cock. She teases you and tells you that the harder your cock gets for her, the tighter your cock will feel in chastity. She has you lock the cage and give her the key. She's in charge of your caged cock now! To make it even harder for you, she gives you what you wanted. She strips further and masturbates in front of you until she cums hard! You don't get to feel that sweet relief that you want to and it makes her laugh. She'll decide once you have fully learned your lesson!