A sadomasochistic orgy is formed in a gym

These women didn't know what they were getting into when they joined the most expensive gym in town. It is a place with super modern machines, but also with a rather strange atmosphere in which their trainers are constantly diving the enrolled students. One morning they invite them to a private and exclusive class, the girls accept out of curiosity and when they enter the room there are others of their classmates totally naked and the trainers are ready with their penises outside to suck them off. The girls accept to be part of this orgy and when they realize it again they are tied up receiving sadomasochistic sex while they pinch their nipples with clothes hooks.