Scene 1. (Swapping) Two couples know each other well. However, the woman in one of the couples enjoys sex with the man in another couple as she falls in love with his muscular body. Then, when that woman’s boyfriend finds out that the two had sex, he starts to burn with jealousy and tries to take revenge on them.
Scene 2. (Lust) A woman was masturbating due to her loneliness. Today, she meets a man for the first time in a long time. She calmly suggested that they must have sex, and the two had sex right away.