When I playfully played SM with my childhood friend, she became a masochist and became an erotic masochist who wanted to be obedient.

Ruka and I have been childhood friends since we were little. I don't know if they are now close to family. But why? I've been having a strange feeling lately. ``I want to mess up Ruka.'' I wonder if it's because of the AV I watched recently. I don't even know the cause of this feeling. Before I knew it, I was saying something strange. ``Why don't you try pretending to play SM?'' Ruka was confused, but she agreed. In this way, we became masters and slaves. At first it was just a casual feeling. It was just a trial. I never thought something like that would happen. I can't believe I'm going to destroy Ruka. I can't believe I'm turning into a masochist pet who obscenely shakes his crotch and begs for training.