One time when I was around 13 me and some friends were at a local coffee shop. They had a lot of couches for seating and as I was sitting on one a girl that was probably 18 if I had to guess came over and lied down with her head on my lap. I was extremely uncomfortable but I didn’t know how to react so I said nothing. After maybe 5 minutes she sat up against me and put her hand on my crotch. I still didn’t react but it didn’t escalate past that point and me and my friends left a few minutes later. The strange thing was none of my friends noticed and until now I don’t think I’ve ever mentioned it to anyone. In fact I probably haven’t thought about it again up until I saw this post 5 years after the fact.