At that time, if I told you well... When her son witnesses her masturbating, Shiori (Shihori Akiyama) regrets accepting the erotic act she requested to stop her. After that, her son's desires got out of control. She sucks on her tits and demands sex while gulping down her breast milk. She accepted Shiori on the condition that she was "just the tip". She doesn't cross the forbidden line if it's just her tip. That was Shiori's idea.
