My younger sister's classmates and her super-masochistic older brother play a king game and end up having an orgy and ejaculate raw.

The devilish schoolgirls who are my sister's classmates (Nanako Miyamura, Miku Ikuta, Nao Fujikawa, Yayoi Amane, Tsumugi Himeyuri) and their masochistic older brother (Junkichi Kashiwagi) play a king's game and end up having an orgy and having sex raw. I was made to ejaculate a lot!