So my ex and I went to a Movie type of party with 20 other people, we were friends with about half of them. While the other half we had no idea who they were. So the lights were out and everyone was watching the projector screen. Her and I sat in the way back behind everyone else, in the darkest corner. At the time we always wanted to try fucking in risky situations. I asked her quietly if she wanted to try it. Her response was a simple but enthusiastic head nod. She wore a denim skirt that she pushed up and she moved her panties to the side. While I whipped my cock out through my zipper. She then sat on my lap and rode me nice and slow. Trying not to draw any attention to us, while biting down on her fist to keep herself quiet. All the while I reached under her shirt from the back and slid my hands forward little by little until I felt the side of her tits without being noticed. I was able to gentle rub her nipples with my fingertips. She was grinding on me and riding my dick slowly for 20 minutes when I whispered into her ear I was close. I came in her almost with such force she almost squealed potentially giving us away. Luckily, no one seemed to hear her. It was so hot