I used to cum in school

I found out that if I stuff my penis on the side of my leg in my pants and shake my leg, the vibration was enough to make me cum. I used to cum twice a day on average during class in front of all my peers. I used to get off to it. Most of the time, I would check out my fellow students and do it, but I'd often get carried away and get caught, but to my surprise, many of them liked it and would even show off to let me finish(many of them would do the math and realize me shaking my leg was me trying to cum). Some even teased me into doing it when I wasn't.