Four mother-daughter pairs visit a famous oil massage parlor. Among them are lolita schoolgirls who have come with their moms. Deep inside the shop, lewd masseurs perform sensual massages on the girls. At first, the young girls shyly resist, but gradually they can no longer withstand the intense stimulation. Repeated acts of gaping, deep throat, handjob, and squirting bring them closer to climax until finally they are creampie. These corrupted expressions of pleasure, brought on by complete strangers, fill them with shame and the desperate desire to keep it all hidden from their mothers. This is the fourth installment of the series, meticulously capturing the forbidden scenario.