One thing led to another and I wound up letting my mother in law basically 'use' me I think just to embarrass me
My mother in law is in her late forties and teaches science at an small private girl's college in a wealthy neighborhood. She is very concerned about keeping her job and this year she's supposed to be evaluated for a permanent position. To help her make her reputation, she asked me if I would help her in a lesson she was planning on biology and reproduction. She asked me if I would come to her class and basically pose in the nude to let her talk about male reproduction while showing her students what she was talking about, using me as the so called model. I was very reluctant to do this but surprisingly my wife thought it was a great idea to help her mother get her appointment. Her mother said she already talked this over with the school's director and she said as long as it was supervised (whatever that meant) it would be ok.
Finally, and after my wife's mother said she would pay me a hundred dollars as a kind of modelling fee for the session, I agreed. That day I walked into this class of about a dozen senior girls around 18 and 19 (I am 26) and my mother in law introduced me and said I was going to help in the lesson. I undressed down to my briefs and laid on the lab table in front of the class which she had put some kind of thin mattress cover on. The girls gathered around the table and then my mother in law took off my briefs and began stroking my prick until I got an erection. She started saying stuff about male anatomy, which I wasn't really paying much attention to, because by now I was getting really hot. After awhile, as she gently squeezed and stroked my prick and balls, I told her I felt like I was going to come and she tightened her grip on the head of my prick to stop me, which kind of hurt but did have the effect of reducing my erection. A little while longer she told me it was ok for me to start masturbating myself and told the girls to say when they started to see anything coming out. At this point, I was so hot I knew as soon as I started jerking off I would shoot my load. As I was playing with myself and pumping away, I noticed my mother in law had a video camera and was filming everything. By now, though, I was so hot I couldn't stop and quickly shot all over myself. After this I asked my mother in law what she was doing with the video taping and she said she wanted to show the tape to the school director and 'did I mind?' What was I supposed to say. I really felt like I was taken advantage of and I told my wife, who just blew it off and said her mother in law told her I did great and said I must be 'a very good lover.'