After divorcing her husband a month ago, Mirei Yokoyama lives alone with her adult son and jumps at an offer to work as a housekeeper for a wealthy family. The job seems to be going well until the ailing man of the house seduces her into a forbidden encounter. She strips and masturbates in front of him, then pleasures him with a handjob and footjob. When the family’s adult son discovers their secret, he demands that Mirei have sex with the male representative from her staffing agency as the price for his silence. Admitting that she is secretly insatiable, Mirei sucks his cock and wraps her soft, full breasts around it before they have rough condomless sex. She rides the thrusts in missionary and screams through repeated orgasms. Watching them lose control, the adult son asks whether he can be next, leading into Part 2.