Her left hand was busy wanking my cock as she sucked it hard. She leant back onto the cistern and lifted her feet up onto the side of the cubicle near...the door. She pulled down her black dress letting her great tits completely free. I reached down and began kneading and squeezing her delightful largish boobs. She shoved Vince into herself right up to the hilt and started rubbing her clit with her right hand. I squeezed and pulled at her nipples and she furiously rubbed at her clit as her first. "Baby, could you please get on all 4s and push your ass up into the air. I want to look at your ass and pussy whilst i stroke myself to orgasm." Am i not doing it right?" Yes baby you are, but right now I can't get the image out of my head of your perfect body and your ass is honestly the best I've ever seen. I would love to cum over that if it's ok with you?"The biggest smile appeared and then up she popped. Instantly i grabbed hold of my cock and went to work. Her perfect little puckered. Miss Sutton nods to Gary who is standing behind his daughter, out of her sight. Tentatively, he brings his palm down on the thinly-clad bottom. Linda wriggles encouragingly. He slaps again, a little harder. Then harder still.Dr Gordon (who has been watching closely): Is that working for you, Linda?Linda: Yes, sir. It's very good.Dr Gordon: Is your cunt wet?Linda: Yes, sir. Miss Sutton can tell you.Dr Gordon: Do you want more?Linda: Yes, sir.He nods to Gary, a cue that he should resume. Once my mother noticed the placement of my hands she loudly admonished me "Don't touch your weewee in front of everyone you disgusting little boy! Playing with your little ding dong constantly is probably what stunted your growth in the first place!". It seemed suddenly everybody was on their phones, and subtley (or not so subtely) trying to take photos or videos of me on their phone, suddenly their days were now interesting as they had seen something so out of the ordinary as to be burned into.