After losing her husband, Youko lived alone until her sister, Junko, became pregnant and asked for help with household duties at her in-laws' home. Much of the housework involved tending to the men, and these daily chores became intensely stimulating for Youko. The entire house reeked of masculine body odor, and given her naturally lustful nature, Youko found herself sinking deeper into lewd fantasies. She constantly imagined what her brother-in-law's cock smelled like, how big it was, and whether it got hard. One day, those fantasies began to turn into reality.