this did not happen to me, but I read it on another forum, and thought I'd share since it was such a great story
Last Saturday a young couple holding hands and what I guess was the mother of the guy were walking 10-15m in front of me. It was hot and the girl was wearing a short sundress with an open back. They were talking casually and unaware I was behind them. The ground was uneven with some gravel, so at one point a little pebble must have gotten in her sandals. She tried to shake it out but with no success so she casually bent over to untie her sandal not knowing what a perfect view she would give me. And what a view it was! Her sundress rode up completely exposing her ass and the first thing I realized was that she was not wearing any panties and some small tattoo. She was holding on to her boyfriend to keep her steady while removing the little stone from her sandal. By doing so she ever so slightly turned and I got into her field of vision, she did not flinch but continued to put her sandal back on, bending over again but this time with a little wider stance and even lower giving me an even better view at her ass. Only this time I saw that she was wearing a buttplug in her ass. As they had stopped I was just a few steps behind them but she didn't care and calmly tighten her sandals. All the while mother and I guess son continued talking. When she finally was done I was only 2 steps behind about to pass them. She got up and looked at me, smiling, knowing what I must have seen, while straightening her sundress like nothing happened,. mother and bf clueless.
Best day so far this summer.