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Your younger step sister, Vicky, has always been a brat. Growing up you would always pick on her and tease her, and she would always go running to your parents to get you in trouble. Your relationship changed the day she walked in on you masturbating to cuck porn and realized you had a tiny cock. Now she humiliates you and your tiny cock and has turned you into her chastity locked sissy ass worshipper. She loves to tease you and sit on your face while she tells you stories about all the big cocks she's fucked.