Surprise fuck when out shopping

Last week when I was out doing my weekly shop at the local supermarket I was conscious of a guy following me around so I purposely bent over pretending to get an item from the lower shelf exposing my stocking tops. I was wearing a short skirt, stockings, boots and a blouse so quite sexy but not to over the top. Well he obviously caught a glimpse as the then approached me and said "nice view are you by any chance Barbara from the Shiny magazines " well that surprised me as it is some years since I did photos and articles for them, We had a conversation about the old days and how he used to like wanking when looking at my pictures and I could see he was getting hard by the bulge in his trousers and I said that looks useful as I touched it which made him go red in the face and he blerted out that he would pay for my shopping if I would properly show him what I had under my skirt, ok by me I said telling him to follow me discreetly to the toilets. I went into a cubical and he followed me in locked the door and i lifted up me skirt exposing my knickerless hairy pussy for him to see where upon he asked if he could wank himself while watching me play with my pussy, Go ahead I said but when he got it out it was so big and hard that i thought this is to good an opportunity to miss so I sat him on the toilet and climbed on and sat on it and gently rocked on it till i felt it spurt up me, it was so exciting just doing it on the spur of the moment that I came as well, He lifted me off and thanked me and said he would wait for me near the checkouts and as we lined up to pay I could feel his cum running down my legs which made me even more horny wondering weather it would drip on the floor. We went outside and said our goodbyes as I walked off with a spring in my step and a trolley full of free shopping.