OBA-301 The mother at my friend's place where I stayed over was extremely frustrated sexually, her name is Kuramoto Yukine.

While my parents were on an overseas trip, I ended up staying at the house of Kousuke, who lives nearby. My mom had strictly told me to study, so I genuinely intended to study with Kousuke. Kousuke is good at studying too... But as soon as I got to Kousuke's house, that plan went out the window in an instant. I accidentally caught Kousuke's mom masturbating. I quickly averted my eyes, but the situation started rolling in a direction I never expected…