MGMQ-136 A father whose son's girlfriend is a slut and has her anus developed while his son is away, making him cum like a female.

Machi and Ken are lovers. Machi is aggressive and has a slutty personality, while Ken is submissive, making for a sadistic and submissive relationship. Hiroshi, the father, is unaware of the situation and is curious about the noises that he hears in their room that day, so he peeks in. There, he sees his son being violated by his girlfriend in reverse anal sex! Since then, Hiroshi, the father, can't help thinking about Machi. As if seeing through his feelings, Machi seduces and plays with her boyfriend's father, making him addicted to the forbidden pleasure in the room when her boyfriend isn't around...!