A nun uses a student as a sexual slave

I study in a catholic school, but the nuns, who care for our education seem to have a different way of life. Something very different from what is customary in this type of religion. Every time I do something that they consider to be wrong, I have to face the punishments that are very advantageous for them. They always want to get pleasure from my cock. I suppose that have fetishes with the forbidden and with adolescents. I say that because the punishment they always involve sex with the sisters or other students. Sometimes they ask me to do a threesome with them. Of course, I can’t say anything to my parents because I could no longer enjoy the punishment. Then, I try to always be a student bad and enjoy the punishment of the sisters.