HUNTB-625 Found out my brother likes to masturbate and the ending

Because of 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'm also considered a shiko! However, my sister-in-law peeked at my AV and masturbation stuff and started to masturbate secretly, moreover, ``I can't stand it, I can't help it...'' Just masturbate wasn't enough and you're 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!