Incest is a topic that is increasing recently. Her younger sister, who has begun to be interested in sexual activity, gets excited by the genitals of her brother, who is her familiar "man". She noticed the difference between men and women and became sensitive to her sister, who was curious about "Chi Po" that she didn't have. She unconsciously invites her forbidden inbreeding to her brother, who has been taking a bath together until now, saying, "Brother, can I touch the penis?"
