Ruka and I have been childhood friends since we were little. We might as well be family. But why is that? Lately, I've been overcome with a strange feeling. "I want to mess Ruka up." I wonder if it's the influence of an AV I saw recently. I don't even know the cause of that feeling myself. Before I knew it, I was saying strange things out loud. "How about we try SM play?" Ruka was also hesitant, but she went along with it. This is how we became master and slave. At first, it was just a lighthearted feeling. It was just a trial. I never thought it would turn out like this. That I would break Ruka. That I would become a masochistic pet who shakes my crotch vulgarly and begs for training.