My sister often enters my room without permission and looks at my PC, erotic DVDs, magazines, etc., then masturbates alone. I knew about it but had been turning a blind eye. But now, I've reached my limit. I'll show my bratty sister the real thing and give her some sex education. When I entered her room while she was masturbating and asked, 'What are you doing?' she stammered, 'A friend did something sexy with her boyfriend. I'm curious too...' So, I ended up giving her a live sex ed lesson…
