At a massage parlor, Aoi happens to be treated by Katsuya, her adult son’s adult friend. She playfully tells him he can touch her directly and asks him to massage her “stiff” breasts. Aroused by her voluptuous body, Katsuya relentlessly stimulates her nipples until she climaxes again and again. Thrilled by the risky pleasure inside the shop, Aoi requests him on her next visit and sinks deeper into the bliss of an oil massage that leaves her entire body sensitive.