A man who keeps several overly obedient big-breasted female slaves. One of them is a college student named 'Hono,' who is perceived by those around her as a plain and quiet girl but is actually a masochistic woman. Another is 'Hazuki,' an overstressed office lady working in accounting at a trade-related company. This time, he summons these two women to simultaneously engage in training play. Since all the acts are performed on both of them at the same time, the women are aware of each other's slave status while performing double kissing, double fellatio, double paizuri, double frottage, and finally, double bicycle sex, using their large breasts to serve.
