… I walked across, erection bobbing about and lay across her lap. My penis was squashed between my stomach and her thigh and as she pulled me further over it jerked my foreskin back and I practically came there and then. She then started to spank me. It stung far more than I had ever imagined, but as I started to wriggle on her knee I found the knob of my penis was rubbing on the material of her skirt, it was arousing me even more and within a short time I was ejaculating all over her knee. I think Sheila realised, as she paused for a few seconds before spanking me harder. When she had finished my bottom was hot, throbbing and I was in tears. As I stood up my erection had gone down but there was a sticky wet patch on Sheila’s skirt. …

via Solo Touch :: Masturbation Story :: Spanking With Karen.