I secretly have my younger sister perform oral sex on me and share her thoughts in a diary. Since we were young, I've indoctrinated her into believing that this is a natural thing for siblings to do, and she still obediently follows. Every day, her oral techniques improve! Recently, my sister has become even more erotic and performs oral sex on me in spots where our parents can't see! It's seriously fucked up! But the thrill of not getting caught by parents who are right nearby takes excitement to its peak! In the end, we crossed the line and can't stop now. We're stuck in an incestuous quagmire... For my sister, it's just a normal thing that any siblings do, so she doesn't question it at all. But I, who know the truth, honestly feel a bit guilty.
