Nikuen

The main character has recently started dating a girl named Aoi. For the first time in his life, the protagonist was invited to the girl's house. However, coming to the place they found Aoi's mother being fucked by an unknown guy. For some reason this did not shock Aoi at all and they went to her room. It turned out that this guy had hypnotized the mother using an app. And the next day his victim was also our hero's girlfriend....