Yuu stays with his aunt Ran while attending summer exam-prep classes, but her effortless sex appeal makes studying impossible. Still sexually frustrated despite sleeping with her husband every night, Ran spots Yuu's young, thick cock and uses him to satisfy her pent-up desire. The experience awakens Yuu's sexuality, and he starts pounding her with wild abandon. His relentless thrusts give Ran pleasures her husband never could, and soon she loses herself in their repeated creampie sessions.