I'm Secretly Doing My Girlfriend's Mom... Yumi Kazama

I'm Hiroshi. I've been dating my girlfriend for six months. Her mother, Yumi, is a single mom who raised her daughter alone—a kind, beautiful, hardworking woman with a calm, mature air... But actually, without telling my girlfriend... I'm also having sex with her mother. Both Yumi and I know this relationship isn't right... but we can't stop our lust and our urge to procreate...