Des:My girlfriend and I are college students. Her younger sister Nanami is a high school girl. Although Nanami had a quiet face, she was actually a masochist... One day, Nanami notices that Im watching, and she seduces me by showing off her masturbation. I was surprised, but decided to train such a perverted younger sister. Masochist training is repeated without her eyes...The relationship with her sister escalates day by day, and she has become a complete masochist who repeatedly climaxes during bondage sex. # Yoro P