An all women gym class beating my cock

There is a female workout instructor at the gym. She conducts group classes. Her classes comprise of all women. A class has 20 women. She is also my cock beater. She beats my cock regularly in her private office. You know the typical slapping, trampling, crushing, kicking, flogging with cloth belt, mini flogger, beating with crop, wooden ruler, etc all over the cock, something that every woman should do or at least know how to do, just the way they learn how to do handjob, blowjob, have sex and such.
One day she said “How about I have the class beat your pecker? I think they will like it”. I agreed. At the next session she said to the class “I want to try something different in our routine. Change in routine will keep you interested in working out regularly. What I am about to propose may startle you but try it out before coming to a conlcusion. OK?” All the 20 women said “Sure!” She said “Are you ready to hear?” The class said “Yes!” She said “How about I have you beat a cock?” There was silence and confused look on everyone’s face. She said “Think of it as a stress reliever. Think of what is stressing you and then take out that stress by beating the cock. What do you think?” There was still a confused look on everyone’s face. They thought it was a joke. They said “Sure, whatever you say”. One woman asked “Do you mean beating a dildo?” She said “No, a real cock!” and smiled. Seeing the still confused look she said “Let me show you and then you can follow along and try it out yourself. Just like any new exercise, it may take a few attempts for you to get the hang of it, so persevere and don’t give up.” She slid the small partition to the side. I was standing naked. I smiled at the class. The whole class blushed in disbelief. She came up to me and told the class “Watch”. With that she slapped my cock on the top. The class gasped. They had never seen a cock being beaten before. It was a medium intensity slap. In private she slaps hard but today she wanted to leave it for the class. She asked the class “Did you see how I did it?” Let me show again. She slapped again, this time on the side. She asked once more if they understood how to do it and slapped again from the other side. Then she told the class “Make a line. One by one come over and slap. Slap how ever you want, how ever hard you want, and how much ever you want.” One by one each one came and slapped. There was a wide variety, all the way from patting to medium intensity slaps; some were comfortable from the get go as if they were experts. She had them do this rotation 3 times, just like all other exercises. My cock was beaten all over. She asked the class “What do you think? Did you like it? Did you find it a stress reliever?” The class wholeheartedly agreed. She said “Next time I will show you what all you can do with your feet. We will make this part of our routine. I will show you many different ways of beating a cock. At the end of these 3 months I want all of you to be expert cock beaters.”
As the weeks went on so did the intensity of the beatings as they got comfortable with it. From that point on my cock was made to learn to take group beatings without bending forward or taking my ass backwards. If I had then I knew what was going to happen. She would have tied me to the wall at the chest, abdomen with my hands at the side, thighs, and ankles. I know this because this has happened before. In one of the beatings in her private office she once gave a me a hard slap that made me wince and bend forward. She said “Don’t bend and stand straight” She slapped again and I winced and bent forward again. She said “I will fix this.” With that she tied me and continued beating it.