Even to me, her younger brother, my older sister Meiling is beautiful and pure. When my older sister secretly brought home a man, I wanted to see what kind of man he was, so I pretended not to be there, and then I heard my sister's voice saying, "Master!" I couldn't believe my ears. The man was my older sister's master! The sound of bodies and bodily fluids colliding, and the obscene voice stimulated my crotch. And then I peeked at my older sister, who had become a masochistic slave, indulging in a messy sex session with a middle-aged man. However, when my sister found out I was peeking, she told me to keep quiet...