Anastasia and I are going out tonight with some hot guys from school. When I head into her room to see if she's ready, I notice she's wearing a pair of bright red underwear that are so big, they're sticking out of the top of her shorts. When I grab and pull, I realize they're a pair of saggy granny panties! Ewwww! No step-sister of mine is going out like that! I grab her panties hard and start pulling them tight and out of her shorts. At this point, it seems the only way to teach her otherwise is to humiliate and her. I scold her as I pull her hot red panties nice and tight so I know they're right up her ass crack. I want my step-sister to look sexy and wear cute thongs like me. That's why guys like and I'm going to drill it into her, literally. I pull her shorts off, exposing her wedgied ass and pussy. Now, the real fun begins as I grab her underwear tight and her cracks. I pull nice and tight, explaining why it's necessary to my little inexperienced step-sister. I don't want her to get made fun of, after all. I'm just looking out for her! I lie back, and turn her over, facing away from me so I can wedgie her cute pussy. She cringles and screams while i tighten my grip and yank the material over her clit. Anastasia is stubborn and still claims to "love" her "comfy" panties, so I floss her ass and pussy real nice with them. By the way she talks and acts, I'm pretty sure my prude little step-sister hasn't even had sex yet. However, after a few minutes, I lean over and discover a vibrator under her pillow! To go out with a bang, I wedgie my step-sister real hard into an atomic and hold the vibrator to her clit. This is why she's a prude virgin! She wears her granny panties all day every day and masturbates by herself in her bedroom. Now, I'm going to humiliate her by her to cum while bound in her precious comfy panties!