I, a working-class wife with unsatisfied desires, was unconsciously seduced by her large, cursing buttocks, and I had an affair with her from behind. (Shiramine Miu, PRED-741)

Lacking excitement in their married life, the wife, Miyu, works part-time at a convenience store, learning from a younger male student and enjoying happy days there. However, Miyu unconsciously exposes her buttocks, which the male student can't resist. He suddenly squeezes her buttocks and penetrates her from behind! Miyu is confused, but her sexual desire has also accumulated. She engages in short-term extramarital affairs in the store and backstage during her working hours! The young male student's vigorous thrusting makes Miyu's buttocks vibrate, causing her to orgasm again and again! The married woman's wanton buttocks make the male student's penis erect again and again! She not only earns an hourly wage but also enjoys sex to her heart's content, indulging in infidelity in the best workplace...