I've done it many times but usually either a friend is next to me or I am more or less alone. Last time was on a train to Belgium. I was alone in a standing area but it was empty so I dropped my pants and lowered my briefs. Wanked a full minute and took a pic on kik to send to the person who dared me. Didn't cum, pulled up my pants with erection clearly showing and started to go to seated area then noticed a security cam. nothing happened but I do wonder.
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