Miu takes a convenience-store job because married life lacks excitement and enjoys being trained by a younger adult student coworker. Her huge ass keeps peeking out as she works, unknowingly pushing the horny young man past his limit until he suddenly grabs it, pounds her from behind, and gives her a creampie. Though confused at first, her pent-up desire takes over, and they start squeezing quick affairs into shifts on the shop floor and in the back room. Her ass shakes through repeated orgasms under his hard young thrusts, and she gradually sinks deeper into cheating at the best part-time job imaginable.