Your geeky stepsister is really upset. Some mean girls at school made fun of her "granny panties". You ask if you can see what they were talking about, and at first she thinks it's weird but gives in and shows you. When you tell her you like them she starts to open up and reveals that these same girls accused her of having no booty. To get your opinion, she takes off her jeans and shows off her plain white panties in various poses, getting more enthusiastic about modeling for you before deciding to lead you upstairs for more fun.