BRD-004 Mother-son play play: Peeping on mother and play

An unbelievable scene unfolded before my eyes. My friend Yusaku was committing obscene acts on his mother. I found myself peeking without thinking... I said to Yusaku, "Isn't this bad? For a father and son to do something like that." And Yusaku said, "I can't believe Atsuro saw us... That's right, next time, please videotape my relationship with your mother. And also my relationship with your sister, Yuki..." I ended up peeking into an abnormal world...