When I had been fucking Mrs Chabot for some time, she told me she wanted me to come and assist her in a couple of her exercise classes. As I've already mentioned, the family were fitness fanatics. I was hesitant, since I had never done anything like that, in fact I had never even been to an exercise class since I left school. I asked her why. She told me that it was difficult for her to demonstrate some of the exercises properly, since her breasts were so big. That sounded fair enough, and she told me the fitness centre was willing to pay for an assitant. I would get some extra cash, so I agreed.

There were two classes, one for over 50, mixed gender, and one for over 60, female only. Mrs Chabot told me that in fact the over-60 class consisted at the moment of just five of the ladies from the over-50 class, who happened to be actually over 60, along with two other women who would arrive later. She said it was very important that I made a good impression, and I would only get to come to the later over-60 female-only class if all the women from the first class agreed I had done a good job. As well as that, I was told I would meet the other two women when they arrived, and they had to agree as well, just based on general impressions before the class began. This was all because I didn't have the usual certificate, and the women were to be told I was a trainee.

I was certainly very nervous. I didn't really care about the money, but I didn't want to make a fool of myself, and I certainly didn't want to fail in case Mrs Chabot was displeased and decided she didn't want to have sex with me any more. A few days beforehand, Mrs Chabot presented me with an outfit. Somewhat to my horror, this consisted of just three items: a pair of thick black pantyhose, a black leotard and a pair of red dancing pumps with elastic straps. Surely she couldn't be serious? She told me it was quite normal and "exactly what the dancers wear", so I reluctantly agreed.

The first class was done. I helped some of the more elderly gentlemen perform their exercises properly, and the way it happened, though I dealt with a few of the ladies, that was more for demonstration, so they could watch me. I forgot about the pantyhose and just got on with the job. I had to concentrate quite a lot. There was a break of half an hour, during which Mrs Chabot and I went into the small office nearby. I was hungry and gratefully accepted a pasta salad she gave me. She told me I had done well and all I had to do now was "look serious and professional" when the two other women met me for the first time. Before long they came, we had a very brief conversation, the class began after another five minutes.

The class seemed to be going well - I thought I had demonstrated all the exercises well and the women seemed very appreciative. At a certain point in the proceedings, I started to feel my penis getting hard. Only a little at first, but when I moved around, it became difficult to prevent myself from having an erection. I turned away when I had an opportunity, groped around and pulled the leotard and pantyhose away from my shaft and balls, and repositioned them. Now my fully erect cock was vertical at the front, and sticking out at an angle! It was more comfortable, but I really did not want it to be doing this! I had thought if only I can move the nylon away from my flesh, it would settle down, reasoning that somehow it must have been all caused by friction. Now, though, I couldn't avoid the thing being seen, obvious and prominent, and I cringed with embarrassment.

Somehow, I struggled along, and the class finished. I was now feeling very hot and bothered, and I still had an erection. I changed into my regular day clothes, my erection undiminished, and waited in the office while Mrs Chabot talked to the women as they left. Eventually she came back and spoke to me. First, however, she unfastened my trousers and got down in front of me and sucked me off. I had a huge orgasm. Then she told me that she had slipped me some viagra. I was astonished, I gasped. Then she told me "and the good news is, two of the women want to pay for you to fuck them".

That was how it began.