Mother-in-law incest - Lewd mother's stuffed body

Yuta, the only son, witnessed his parents having sex when they were supposed to have cooled down. ``My precious mother's body was defiled by my father's sexual desire...'' Feeling that way, Yuta comes up with a plan out of jealousy and anger. The idea was to show his father his physical relationship with his mother, which he had kept hidden until now.