A Record of a Friendship with My sister in a Bathhouse

recently, there's been an increase in the number of people who can't talk about it. From the day that a gentle and beautiful "sister" is seen as a "woman," "younger brother" transforms into a "male" who aims to be a "female" living in the same house. When she enters the bath where she exposes unprotected naked bodies inspired by the smell of females who smell every day from her estrus, her sister reacts to her erected younger brother Chi-po and accepts Ma-ko.