I separated from my husband a few years ago and have been living alone with my only son, Hiroki. However, I recently started dating Sato, a subordinate at my company. Hiroki has also secured a job, so I thought I would take this opportunity to introduce him to Sato and we decided to go out to dinner together. Maybe because I drank too much, I got in the mood and Sato and I shared pleasure together... but I never imagined that Hiroki was watching us like that...