Toru in his puberty was obsessed with his mother Erika's sexy body!! He would peek at Erika while she was taking a bath, get an erection, and use her image as material for his fantasies. As his desires escalated, he could no longer satisfy himself with just fantasies, eventually playing tricks on sleeping Erika. However, Erika had noticed. Recently always sexless and frustrated, Erika was actually excited by her son's mischief.
