Miyu and I were the only ones left preparing for the cultural festival. Because there was rope used for the work, I jokingly asked, "Can I tie you up with this?" She said "Ehh~" shyly, but she didn't refuse. When I tied her up roughly but tightly, her breathing became rough and she was going wild... Seeing that erotic face, I lost it. Driven by the impulse to make Miyu, who has a masochistic switch on, even more obedient, I continue playing as I come up with ideas. It escalates more and more, and I go crazy for the painful and pleasurable SM sex...