Mizuki couldn't bring herself to reject her son when he said, "Let me be the one to satisfy you." With her husband constantly away on business trips, she had been resorting to masturbation to cope with her loneliness. Gradually, Mizuki lost her composure, overwhelmed by mounting pleasure. Telling herself it was just a one-time mistake, she intended to return to being a proper mother starting tomorrow. But faced with her son's powerful, stamina-monster cock, she found herself unable to keep that promise.