Shinobu Kayama plays a mother who has just turned sixty and, having given birth to her son at an advanced age, dotes on him more than anything. Her affection gradually evolves into an abnormal, deep emotional attachment, which her son reciprocates with intense desire. Embracing his feelings without resistance, she welcomes the forbidden bond between them. Soon, her son's actions grow increasingly passionate—he obsessively clings to her mature, fully ripened vagina, overwhelming her at first. Yet, confusion slowly gives way to pleasure as their taboo intimacy unfolds. Her slender body writhes intensely, and as her son fills her womb with creampie after creampie, she reaches powerful orgasms. The flood of semen injected into her long-dry sixty-year-old vagina violently shakes both her body and soul.