You came into your friends house and you saw his younger step-sister studying. She was on couch in short denim shorts and white cropped hoodie. Hew little body was so tired and stiff that she had to stretch. You were just staring at her while she changed positions continuously stretching from time to time. Her belly was completely irresistible. At one moment she caught you looking, but didn't say a word, just made few eye contacts letting you know that she knows what are you thinking.