Uchi no Otouto Maji de Dekain Dakedo Mi ni Konai?

The main character is a piece of meat named Nao, who was caught masturbating by her older sister. The older sister named Chiaki was surprised to see her younger brother’s monster-level boy. So the next day, she invited her two best friends, Yukiko and Nagisa, over to “show off” her younger brother’s little boy.

After seeing Nao’s giant dick, Yukiko was so horny that she sat on it and tried riding it. Just a few thrusts were enough to make Yukiko’s experienced pussy squirt with pleasure. Next is the older sister named Nagisa, who already had a boyfriend but had never reached orgasm because of her boyfriend’s tiny dick.

However, when she just inserted Nao’s dick, she immediately reached orgasm. Gradually, Nagisa revealed herself to be a masochistic girl. After being numbed by Nao’s dick, she immediately volunteered to be Nao’s yogurt tank. While her two best friends and her younger brother were having a wild time, Chiaki opened the door without realizing it, and what happened?