Nakamura: It's a contest between you. A harsh punishment will be awaiting losing party. It goes like this, Nishihara, I put on you a device, and you should endure and not come from it. If you come, you lose points. On the contrary, Tohno will be masturbating, if she manages to make herself reach an orgasm, she receives a point. So, who'll have more points in the end, wins the game. Of course, Tohno, you don't have to masturbate. In this case, it'll certainly be you who gets the punishment.
Tohno: What a perverse game...Nishihara: Hey! What are you...?!
Ishii: We thought of a game.