Always wear panties!

Family

One day in the summer, my sister and I were outside wearing summer dresses. She's 12 and I'm 15. There were really hot guys outside about Katie (that’s my sisters names) age. So I tripped her and her dress went up. I didn't think anything of it, but she said she would get me back. One day, I was getting ready to go out. I don't know why, but I always but my panties on last minute. So I'm walking around my house in a falry skirt and tee shirt. I didn't know, but my sister invited these really hot guys from my school inside for a drink. While I was walking upstairs, my sister pushed me down. I toppled down the stairs, completely exposing myself. When I got to the bottom, my legs were spread out and my skirt was over my head and all the guys were laughing at me! It's 3 years later, and every time they see me they go "Hey, when can we get another show?" IT'S MORTIFING!
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Vibrators!