"I" came to her house to stay overnight today. I was sleeping with her in her room, but I suddenly woke up in the middle of the night. "My throat is dry..." I slipped out of bed and headed to the kitchen. As I was drinking water from the refrigerator, I heard some lewd noises coming from the living room. "Hmm? What's that?" When I went to check, her sister was tying herself up with hemp rope. Then, her sister, who was showing off masochistic masturbation and seducing me, ended up getting trained by me...
