Mariko's husband is away on a long business trip, and she lives alone with her son, Kazuya. Her son's new friend, Atsushi, has recently become attached to her... But Atsushi, who lives in a single-parent household and is starved for a mother's love, confronts her with desires that go beyond affection and forcefully pushes her down. As he caresses her greedily, Mariko is unaware that she has not felt for a long time. The stimulation of his youthful and powerful penis, which her husband does not have, reminds her of her womanhood, and she cannot suppress the rising throbbing in her body...