GVH-369 Her sister is a masochist, Miyazaki Rin

"I" came to her house today. We started drinking at noon in the living room, just me, her (college student), and her sister (OL). After a while, she seemed to get drunk and fell asleep on the sofa. With no choice, I was relaxing next to her when suddenly her sister started taking off her clothes in the dining room across from us. Despite my shock, her sister bound herself with hemp rope and performed masochistic masturbation right in front of me, even begging me to train her…