女子校に通う3人は男に飢えていた。まるで男子●学生のようにオナニー談義で盛り上がっている。しおりに弟いるよね？弟クンのチンポを見てみたいと盛り上がり、美術の宿題のモデルになってもらうテイで、すっ裸にさせたら意外とデカチン！！ムラムラがエスカレートしてしまい―お姉ちゃんの友達たちの生挿入中出しのおもちゃにされ…「え？お姉ちゃん？？」2人が帰ったあとムラムラしたお姉ちゃんにも襲われた！？？

Three girls attending an all-girls school were starved for male attention. They were excitedly discussing masturbation like male high school students. "Shiori has a younger brother, right?" They got excited about wanting to see her brother's dick, and under the pretense of asking him to be a model for their art homework, they got him to strip naked, only to find out he had a surprisingly large cock!! Their lust escalated, and they became toys for their older sister's friends, getting raw-fucked and cummed inside… "Huh? Big sister??" After the two left, their horny older sister attacked them too! ? ?