GVH-343 Her sister is a masochist Yusaaka Fuyuki

"I" was staying at her house today. She was sleeping with her in her room, but in the middle of the night she suddenly woke up. "I'm thirsty..." I slip out of her bed and make my way to the kitchen. When she takes out water from the refrigerator and drinks it, she hears a vulgar voice from the living room. "Hmm? What is it?" When I went to see how it was, there was her older sister tying herself with a hemp rope. And I decided to start training my girlfriend's older sister who showed me her masochist masochism and seduced me...