My gloomy self was used as a prop in a punishment game by my sisters, and I ended up having a harem sex session with them!! MKON-148

My younger sister used to be so cute, but lately, all she says is things like, "Brother, you're disgusting!" and "Don't wash your clothes with mine!" Then one day, she brought her friends over and told me, "Don't you dare leave your room!" I had no choice but to stay inside. Then I heard noisy footsteps going upstairs. The next second, the door was flung open, and my sister suddenly showed me her underwear, yelled "Go to hell!" and left immediately. What just happened?! It seems I've been used as a punishment in a game, and the difficulty is gradually increasing. In the end, I ended up having a harem sex session with all of them!