A diary of my oral sex with my sister, kept completely secret from our parents! I make my sister give me oral sex and share my thoughts in my diary. I taught my obedient sister from a young age that it was a natural thing for siblings to do, and she still believes it. My sister's oral sex techniques are improving day by day! She's getting even more erotic, and her techniques are escalating, so she gives me oral sex when our parents can't see!