The man keeps several overly obedient big-titted female slaves. Among them are "Hono," a seemingly plain and gentle college student, and "Hazuki," an office lady on the verge of being crushed by stress. This time, he summons both of them together for a simultaneous training session. Since all the action unfolds with both women at once, they remain acutely aware of each other as fellow slaves, performing double kisses, double blowjobs, double titty fucks, double dry humping, and even double penetration on a two-wheeled device—using their large breasts to service both the man and each other.