My name is Hiroshi. I've been dating her for half a year. Her mother, Ryo, is a beautiful, hardworking, mature woman with a calm demeanor who has raised her daughter as a single mother. But actually, I've been having sex with her mother, without her knowing. Both Ryo and I know that this kind of relationship is not good, but when we're alone, we just can't help but bump our hips together.