Sign me up for the enema class!
Since I started dong enemas I've always had an enema-class fantasy like this. All students in the enema class agreed in advance to write their names on a note card and throw them in bowl for possible selection to participate in future class enema demonstrations. For each enema demonstration, the instructor, a hot chic in a stereotypical sexy-nurse costume, picked a name out of the bowl for the naked enema recipient. That person, often me, had to immediately come up to the front of the class, strip off his or her clothes, and await his or her enema. The instructor then picked another name out of the bowl to be the enema giver, or she did the honors herself. I greatly enjoyed watching, giving, and receiving enemas in enema class.
When I was in middle school, I had a similar fantasy about our sex ed classes being held in the school's biology classroom, which had a large lab table in the front that the teacher used for biology demonstrations. In the sex ed class, the teacher first used the lab table to demonstrate things like putting a condom on a banana, and using realistic male and female dolls to show how sex worked. With our own props we followed along at the smaller student lab tables where we sat. In my preposterous fantasy, which was still real enough to get my rocks off at age 13 or 14, the demonstrations near the end of the course became live sex demonstrations. Students were free to attend or skip these final classes, but if they attended, they had to agree to assume the risk of being randomly selected by the teacher to be one of the performers in the several live sex demonstrations.
Only a few students chickened out and elected study hall instead of these final sex ed classes with the live sex demonstrations. Of course I kept getting randomly selected. In my first demonstration, the teacher asked me to strip and sit on her big lab table in front of the class. Then she picked a long series of random girls to come up, get me hard if I wasn't already, put a condom on me, and take it off. I was picked for another demonstration where the teacher had me strip and stand in front of the class. Then the teacher picked a random girl to stand behind me, reach around me with one arm and jerk me off in front of the class to show all the girls what a male ejaculation looked like. Then it got really good. I was again randomly selected to have sex with the hottest cheerleader in school on top of the teacher's lab table in the front of the class. The cheerleader was experienced, but I was a virgin. The teacher and the cheerleader had to show me what to do and guide me with their hands. The class loved it.