A similar thing happened to me.
Our middle school was organizing some clubs around various physical exercise, there was like a tennis club, a martial arts club, and a swimming club etc etc. I picked the martial arts club and for some reason only liek 5 other people picked it, and 4 of them were girls who were in a friend group. So when we sparred, I usually got paired with the 1 boy, but there was one time he wasn't with us and I ended up sparring with one of the girls. She was my "training partner" for that day and ended up sitting on my face and rubbing her crotch on my body several times while we 'trained'. Also when we wrestled at one point, she headbutted my crotch area really hard on accident and I bent over in pain, and she got nervous and was like "im really sorry!" and put her hand on my sore cock through my pants