This happened about 10 years ago.
When I was younger in order to have spending money I used to go around with my Dad and help him with landscaping work. My Dad and his friend had started a business and had gotten a lot of clients many of whom lived in very upscale neighborhoods.
One day my Dad took me to the biggest house I had ever seen in person and told me that I could start raking leaves and he would go down the street for a short time to work on another yard. The yard I was in was just as impressive as the huge old house it belonged to, if not more so and up near the house there were wooden partitions with vines growing all through them. This made a simple, mini maze and in the middle of the maze there was a flower garden.
I had gotten tired of raking and began to explore the yard. I didn't think anybody was home and so I felt very free to roam around the property. My adolescent body began to react to the subtle stimulus of being alone outside. I put down my rake and went near the flower garden.
I pulled my penis through the opening in my pants and pulled the foreskin back as far as it would go revealing the head of my penis already engorged with blood. My brown foreskin about 10 shades darker than my the head of my penis which was beginning to turn a light shade of purple.
I stroked my penis, with no fear of being caught. I remember how big the head of my penis kept getting especially right before I ejaculated my Latin seed over the flower garden.
I was basking in the afterglow when I saw an older woman come around the corner and gasp and turn away as she looked at my penis. I was so scared because I had no good explanation for what was going on. The lady then turned around and said she didn't want me urinating in her roses and if that I needed to do so then to use the guesthouse which she said she would leave open.
I don't think she ever told my Dad and certainly didn't know I was his son, but that for me was one of my best getting caught experiences.