My little sister comes into my room without permission and masturbates alone while looking at my PC, pornographic DVDs, magazines, etc. I knew that but I turned a blind eye to it. But I can't take it anymore. I'm going to show my precocious little sister a real, raw dick and give her a sex education. I entered my room while she was masturbating and asked her, "What are you doing?" She stammered, "My friend did something naughty with her boyfriend. I was interested too..." So I ended up giving her a real sex education...