Riko Tokushima (40), visiting a massage parlor introduced by her husband's acquaintance, receives an oil massage only to suddenly find herself seduced. What begins as a simple treatment takes an unexpected turn—she's repeatedly brought to orgasm during the session, eventually giving in to sex. Initially curious, she soon finds herself overwhelmed by deep desire. She experiences creampie sex, succumbing to intense female orgasms again and again. Despite her shock at the sudden turn of events, her body instinctively responds, revealing her helpless arousal.