Jiro is staying at his aunt Risako's house to prepare for his exams. Jiro is reunited with Risako, who looks even more beautiful than before. He is distracted from old stories and only looks at her ripe body... Then, noticing his gaze, Risako suddenly asks, "Jiro, you've been studying for exams... have you been building up?" and starts to play with the bulge between his legs. Drooling, Risako sucks his swollen glans... "This one's bigger than it used to be, too..." Without even knowing what's going on, Jiro is brought to his climax by his aunt's tongue skills, which he has always admired...