I jacked off in my backyard in broad daylight a couple times when I was 12. This was at the height of my hormone craziness, I jacked off with my younger brother in the room playing video games as well. At this time I had no idea what I was doing was bad in any sense, only later did I realize that that behavior isn't quite socially acceptable haha.

Probably in my friend's mom's room. Was about 15, I ran into her room to use the restroom and she was cooking dinner for all of us in the kitchen. She had left out a pair of black lacy panties on her dresser, had been a long time for me so I used them to help me finish up real quick and then stuck them at the bottom of her dirty clothes.

Gelbooru.

EEEEEEEEEEEEEEEEEH www.youtube.com/watch?v=9CdVTCDdEwI

(Wanted something else, it's that little ragtime/vaudeville type riff I don't know the name of. But this'll do.)

When I was about 21 or 22, I sat in the corner of a public pool subtly masturbating.

One time I fingered myself in the backseat of my mom's car on the way to kentucky

Back of a cruiser with an inattentive female officer whose uniform was unbuttoned ;Þ
(my arms are long enough I can vault right over)
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We have lots of amazing choices to go with, too!

Nothing like post-riot denouement on warm spring days!

When I was in sixth grade, I masturbated in a handicapped stall of a women's bathroom during school band practice. For some reason, I hadn't yet figured out how to masturbate via the usual way, e.g. jacking off, but I had figured out how to bring about a climax by applying pressure and rubbing the root of my penis beneath my scrotum. I remember that I hadn't closed the outer door all the way, so I could hear the strings section practicing scales as I worked it!