One time I was kind of bored and really horny late at night, and this was very late at night, since I like to sleep through the day. I decided to go for a walk, and just take in the night air.
As I was walking I saw that there was part of the sidewalk that didn't have any porch lights or street lights shining on it at all, and I got a naughty idea. I nervously leaned against a tree and slid my hand under my underwear and started feeling myself, but that only got me more riled up. after a while I looked both ways to make sure no one was coming and then I dropped my shorts and underwear and drooled into my hand, and starting masturbating. I was scared someone would drive by but that just made it better, so I just decided to shut my eyes and let it feel amazing. After a while I felt myself cum and I just leaned against the tree for a little while longer before pulling up my pants and walking home again.
I've not done this again since, but I might just do it one day.