Tired of a husband consumed by work and neglecting their family, Hitomi once again finds herself alone in her room tonight. Suppressing the growing loneliness deep within her body, she touches herself, letting out hot, trembling breaths. Unbeknownst to her, her son Yutarou has noticed her state. Rather than merely peeping, he recognizes his mother's loneliness and decides to satisfy it with his own body. The next morning, while cleaning, Hitomi is suddenly confronted with Yutarou's fully erect cock. Trembling with shock and shame, she finds herself captivated by its size and heat, unable to resist grasping it tightly. This act is not mere impulse, but proof of another emotion buried deep within her heart.