HUNTB-625 Discovered that my younger brother likes to masturbate and the ending

Due to family circumstances, I ended up sharing a room with my sister-in-law. One day, I was secretly watching AV when my sister-in-law fell asleep, but my sister-in-law found me! Of course, I was also considered a shiko! However, my sister-in-law secretly watched my AV and masturbation stuff and started masturbating secretly, moreover, `` I can't stand it, I can't hold it in... '' Masturbation alone is not enough, and she's greedy for my cock! I saw the most disgusting thing in my life, but instead I had to have sex with my sister-in-law!