JUR-701 Her sister's intense training has my crotch rock hard… My muscles and erect dick are being vigorously rubbed, soaked in sweat and love juices, enjoying the beauty of her body and cheating sex with cum inside. I'm the lowest piece of shit. Yuki Tak

``That's right, Shingo, let your sister train you!'' I was currently living a semi-living life with my girlfriend, Miu, staying at her house only on weekends.One day, Miu's older sister Yuki suddenly comes to stay at Miu's house.Apparently she is studying hard because of her husband's affair...Yuki-san works at a personal gym, and at Miu's recommendation, I decided to undergo semi-intense training as well.His muscular body and beautiful face were just a stone's throw away, and I got a hard erection.Yuki noticed my excitement and gradually escalated the seduction training...