Forbidden physical relationship between blood-related brother and sister. A brother and sister are alone at a hot spring inn that no one knows. Recently, my younger sister "Ai" has suddenly grown into a feminine body. She has been educated to receive her brother's sperm in her mouth or womb. As she rubbed her soft and heavy breasts and buttocks and stroked them, she looked at me and smiled, "Your brother's sperm, let me put it in a lot today, okay?"