Junpei is a hardworking son completely devoted to his job, avoiding any romantic entanglements and dedicating every day to his career. His mother, Sae, grows concerned about him. When she tries to talk, Junpei becomes sullen and, despite having work the next day, drinks heavily until he's completely drunk. The next morning, Sae attempts to wake her intoxicated son and accidentally sees his fully erect cock prominently rising from his chest. Puzzled, she wonders, "Is this... morning wood? Or maybe... tired dick?" Feeling sympathy for her son, she unconsciously begins touching herself. Determined to fulfill her son's needs, she resolves to release her own suppressed desires. Sae tenderly licks his cock, then uses her ample breasts to stroke him. Her body heats up, arousal building beyond control. When Junpei wakes, she pulls him into a tight embrace, and their relationship takes a new, intimate turn.