Incest [silent] Incest - my dad is next to me...

His father, Taichi, was able to remarry the young and beautiful Reiko, and was living a happy life every day. However, even the seemingly happy family members were experiencing unusual behavior in places they were not visible. It is an incest between a stepmother and son that is never allowed. Her stepmother stops her son from feeling guilty towards her husband, but her actions become more and more bolder than her as if she enjoys the thrill...