JUR-701 | Her older sister's close-contact training has made my crotch rock hard... I'm the worst kind of guy, enjoying her physical beauty and cheating sex with her, getting drenched in sweat and love juice as she vigorously strokes my muscles and erect cock. - Yuki Takeuchi

"Hey Shingo, why don't you get your sister to train you?" I was currently living a semi-cohabiting life, staying at my girlfriend Miwa's house only on weekends. Then one day, her older sister, Yuki, suddenly came to stay at Miwa's house. Apparently, she was studying hard because of her husband's infidelity... Yuki worked at a personal gym, and at Miwa's suggestion, I was practically forced to start training with her. Her muscular body and beautiful face were right in front of me, and I was getting rock hard. Yuki noticed my excitement and began to escalate her seductive training more and more...