My Girlfriend’s Sister is a Masochist – Arisaka Miyuki

Synopsis

I’m staying over at my girlfriend’s house tonight. I was sleeping in her room when I suddenly woke up in the middle of the night. “I’m thirsty…” I get out of bed and head to the kitchen. As I take water from the fridge and drink it, I hear some suggestive moans coming from the living room. “Huh? What’s that?” When I go to check, I find my girlfriend’s sister binding herself with rope and masturbating. Her provocative display of masochistic pleasure leads me to begin training her…

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