My local sex shop is run by an attractive middle aged lady and I often go in there to buy big tit films and browse through the porn and the masturnbation toys. Over the years I have got on friendly terms with her and she looks out for big boob movies for me. I often chat to her about the best masturbators and I get increasingly brave talking about my masturbation habits with her. A few weeks back I popped in there and purchase a variable speed vibrating cock ring and then went back to my car and put it on with the speed set low enough that it could not easily be heard. Then back to the shop with a throbbong hard on to browse the porn. When I was within aa whisker of orgasm I selected a film and went to the counter to pay. My timing wasn't bad and as I took my change I blew my load in my pants thinking it was all very discrete until she smiled at me and said "Did you enjoy that?" I blushed and made to leave but she siad "its OK! I understand, we get all sorts in here but if you are going to masturbate in the shop for fuck sake be discrete, the moment you get your cock out in the shop you are banned". I stammered my apologies but she said I was a good customer and she looked forward to seeing me again soon. I staggered out of the shop bright red in the face with a big tit film in one hand and a cum stain spreading across my jeans. Eeh Gads! If I saw that I would say what a pervert!