A young man from the countryside moves to the city for work and begins living with his uncle's family. Though he was never close to his uncle, he's always had feelings for his aunt, Natsuki Natsuki. Reunited after moving to Tokyo, she treats him just as warmly as she always did. After overhearing harsh words from his cousin, the young man feels downcast. That night, Natsuki checks on him in his room, offering to listen to anything he wants to share. Gathering his courage, he confesses his love for her and pleads to hold her just once. Though slightly hesitant, she gently embraces him. Overwhelmed by her warmth, he grabs her hand and guides it toward himself. She begins tenderly stroking him, saying, "Just this once, okay," and he loses control, climaxing instantly. Yet his arousal doesn't fade, and he longs for her again. Responding to his desire, Natsuki gives him a slow, sensual blowjob, bringing him to a second intense orgasm. The next day, still naive about women, he asks Natsuki if she ever masturbates. Flustered, she admits she does so occasionally. Excited, he begs to watch. Yielding to his wish, Natsuki slowly begins pleasuring herself, carefully and deliberately, right before his eyes.