Jon has always be insecure about the size of his penis. He felt a wave of shame and humiliation as his felt his small member throb. He look of at Zoe and tried to gather any courage remaining and said. "Zoe, you promised not to look" he squeaked, shyly.
Zoe let out a playful giggle as she look at her older brother standing there wearing their mom's purple panties. "Is it even bigger then my pinky? She laughed holding up her pinky?
Jon felt a wave of sexual arousals from his sister teasing, trying his hardest not to touch his dick. This was wrong he thought, this was his sister. Why is this this so hot? He wondered.
Trying to grab control of this situation he started begging "Please sis, I did what you wanted. Please stop teasing me".
Zoe left out another giggle. That caused Jon dick to pulse. "Fine" she said and continued. "Our bus for school will be here any minute." she grinned "You better wear them all day or I am telling Mom about this". As she walked towards the door and added "Or maybe I should tell the people at school about my panty wearing, micro dick brother" She laughed with a dark chuckle.
