After her divorced husband takes custody of her son, Rin, overcome with frustration and loneliness at not being able to see him, has a physical relationship with her son. Seven years later, her husband remarries. On the one day a year when she is able to see her son, she can't forget the warmth he felt that day. "Don't forget me..." Rin kisses him forcefully. She massages her breasts with her own hands and takes her son's erect penis into her mouth. "We're not father and son anymore, so please go deep inside me." Her love is unstoppable...