I accidentally went into an adult video store, and a sister in a short skirt was wandering around inside, so her panties were fully visible. I started having all sorts of fantasies about this out-of-place sister, and as a result, I got hard, and my dick touched her ass in the narrow store. There were only two of us in the store, and my heart was racing, thinking she wouldn't refuse if I touched her. So, I sneaked and did it while the clerk wasn't looking.
