Shiokawa Undan, the No. 1 M-girl in 2022, was found to writhe in agony when her nipples were roughly touched, so we decided to train her to focus on nipple torture. As expected, she was in a state of extreme agony when we tied a total of 1kg of weights to her nipples and pistoned her from behind! When we pulled her so hard that it seemed like she was going to tear off and continued to thrust into her throat, she cried tears of joy.