My girlfriend betrayed me so I set up her rape as revenge

After fucking my best friend's little sister, I started thinking about what to do next. I was still angry and wanted more payback. He betrayed me with my girlfriend, so, I fucked his sister in the ass. I intend to keep doing it, but I won't admit to anything until his sister turns eighteen. I smiled as I thought about the look on his face when he finds out I've been fucking her for three years.