MY FWB & I worked at a drive-up liquor store (just beer, cigs, chips, water, soda, gum/candy, no hard stuff). We decided to see how far we could go before the next car pulled up. The cooler was behind a big shelf, so I'd sit on the cooler, or bend over it, and we'd go at it. Actually, this happened more than once. One time, we were only interrupted 3 times, another it was about 10 times. He never lost his hard-on fully, and a couple of times, we got so busy, I had to help him at the front, groping him here and there, out of public sight, so he'd want to finish what we started!