My wife's mother and my father, Ayaka Tomoda, ALDN-349

I've been married to my wife for four years. This man is my biological father. My mother has passed away, and we live with my wife. The woman living here is my wife's mother, or stepmother. Sometimes, my stepmother comes to visit her daughter, and we live a peaceful life. But one day, my father and my wife's mother had some kind of relationship... I heard noises and rushed to the scene, only to find myself unable to stand...