One evening my sister had her friend over and we ended up playing cards sat on the front room floor. After a while I noticed I could see right up her friends skirt to her tight white panties and she was sitting with the heel of her foot right under her puss. Every time she leaned forward to pick up a card she would ride over her heel and then I realised she was using it to get a rub. Her face was flushed and she was wiggling about, the whole while spreading her thighs wider apart giving me a perfect view of her tightly spread white panties.
I became really stiff and started to thrust slowly into my jeans and get a rub from my hands now and again as I stared at her firm young thighs flexing and how her panties had become sucked right into her slit, how puffy her puss was bulging around her foot and the sight of her young puss grinding over and over the heel of her foot. Towards the end of the game she moved her foot and I could make out the redness of her sex against those pure white panties, moments later I was in the toilet wanking for all I was worth.