I thoroughly trained my girlfriend, a big-breasted, J-type girl from Kansai who always bullied me, to become a sensitive, premature ejaculation-prone girl who could experience nipple orgasms through masturbation. (Arai Rima LULU-244)

My girlfriend's younger sister, whom I met for the first time, was a little sissy. Even though it was our first meeting, she looked down on me and made fun of me. She was cute, but shameless; she didn't treat me like a man, or even a human being, so she didn't seem to mind not wearing a bra and having her nipples exposed. I hated that her nipples were so cute! I couldn't resist reaching for the defenseless little sissy's nipples… At first, she resisted the sudden nipple torment, but she couldn't take it anymore. I continued to twist her nipples until she reached orgasm…