HUNTC-350 "Big Brother Punishment Game" starts! This is a punishment game where the little sister and her friends suddenly show their panties by barging into the room of the big brother who is usually called creepy!

A brother who is usually called a pervert. His sister and her friend suddenly barge in, showing him their panties as a punishment game for losing at games! Things escalate further to "showing pussy" "being obedient"... eventually leading to sex! Initially, the sister and her friend genuinely hated it. But despite calling it a punishment, they got more and more excited, unable to hide their genuine interest in dirty things. Then, they find themselves climaxing from the brother's dick, whom they were supposed to hate! The brother, who was initially just a tool for the punishment game, ultimately reigns as the best big brother who makes them feel good!