Enjoy this true story.
I was sitting in my tour bus just people watching, whilst my passengers were looking around the sights. This young male, about 20 years old stepped out of his car, obviously this person just woke up and did not have time to take care of things, as he had on these athletic shorts that revealed a huge hard-on and I could make out every detail of his hard penis.
He stood there for 15 minutes or so. As I was sitting in my drivers seat, I unzipped my fly, pulled out my hard-on and wanked fast, within five minutes I orgasmed violently. He smiled at me and walked on.