I FIGURED IT OUT YOU HAVE TO GO TO THE SAVE WHERE MOMOKO AND KIMIKO AREN'T BATHING AND CORRUPT MOMOKO MORE AND TELL HER TO NOT LOCK THE DOOR WHILE BATHING
The problem with that is that you and me don't have the same saves tho :/ by I have no idea what save it is , I mean that amongs my set of saves I don't know which one would be the closest ... if even any would be remotely close , because when as far as i remember the bathroom I had it for a long time and I was sure that it was able to do later in the game , and now that task is literally the only thing i have left.