She unintentionally let her roommate's teenage daughter move in, and in exchange for borrowing her room, she used her breasts and private parts for free. (Uno Mirei, SONE-544)

From childhood, my childhood sweetheart, Meiling, would always run to my room to hide whenever she argued with her mother. She's grown up now, and I hoped she could mature a little. "I want to masturbate, please leave for a moment." "No, if you want to masturbate, I can help you, because I can't feel anything, so I won't make a sound." I thought this was fantastic, free use of her private parts and breasts, it was amazing… But even when I used her private parts and breasts to my heart's content, she couldn't feel anything at all, which was more frustrating than masturbation… As a man, I had never felt so frustrated. Therefore, I started trying to make Meiling orgasm…