Finally, Jack turned and whispered to me to put my hand up my skirt and start masturbating. I did as he told me and after a couple of minutes, I knew that the guy directly across from me noticed that I was doing something under the table. Nothing was said until Jack turned to me and grinned. He asked the guys if they had ever seen a woman masturbate before. They were a little stunned at the question and glanced to see how I would react to Jack's question. They both finally said no and then Jack turned to me and told them that they couldn't say that anymore because...