You are jerking off when your sister barges in the room. You can't blame her though because you share a room with her. She is in a rush and has to change but she has multiple rituals she has to complete. Every time she tries on a new pair of panties she has to aggressively put them on and off 10 times, counting aloud. When she changes her outfit she has to hump each corner of the bed 10 times. She encourages you to "ignore," her and continue to jerk off. I think you both know you're really jacking off to your sister.
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