OBA-301 Yukine Kuramoto, the sexually frustrated mother at my friend's house while I was staying the night

While my parents were traveling abroad, I ended up staying at my neighbor Kosuke's house. My mom had been sternly telling me to study, so I had intended to simply study with Kosuke. Kosuke is good at studying, after all... But when I got to Kosuke's house, my plan was dashed in an instant. I accidentally came across Kosuke's mom masturbating. I quickly looked away, but the situation took an unexpected turn...