Sayuki visits her parents' home to celebrate her niece's school entrance, but her mother and sisters are out shopping, leaving only her brother-in-law at home. Trying to avoid him—he already drunk by midday—Sayuki heads to the shower, only for her brother-in-law to force his way in. To her shock, she sees his massive cock! Thrown onto the bed, she's pounded relentlessly, her eyes rolling back with each thrust as her body convulses uncontrollably.