Life was dull and monotonous. The boy stood atop his mother Megumi's crotch, her head bobbing up and down with wet, squelching sounds as he stared blankly. Entranced by her beauty, he let out a soft moan. The relationship between mother and son gradually deepened. As the son's dominance grew more forceful, the mother found herself yielding completely to his will. Day after day, night after night, she submitted willingly to the act of incest. Then, with the arrival of early autumn, the boy visited his relatives' home and reunited with his mother's younger sister, thirty-year-old Natsumi. Radiating a stunning, sensual charm, she became a presence who stirred the boy's heart.