Futanari Haha to Goumon Musume

The Amashiro family looks like any other ordinary happy family from the outside, but they hide dark secrets. The mother, Miki, is a masochist; the father is a mad scientist; and the daughter, Misaki, shows no emotions. Adding to the oddity, a clone of Miki lives with them. One day, Misaki catches her mother masturbating to the scent of her underwear, and as she confronts her, their sexual desires begin to align.