One day, I visited a girl's room in Toshima Ward. In her small six-tatami one-room apartment, I learned her boyfriend occasionally stays over. She was extremely sensitive—her body would twitch violently ("Biku!!") even from the slightest touch. The walls were thin, making every sound clearly audible to the outside. At first, she tried to suppress her voice, but gradually grew louder. After reaching her first climax, she stopped holding back entirely and continued moaning openly, clearly enjoying herself.