I thought I could trust a secret with my step-sister. I had to tell someone what I've been thinking about my new step-mom. I thought maybe unloading my dirty fantasies would make them go away or at least not be such a constant bother. I was wrong. After I spilled my secret longing for my step-mom to my step-sister I found myself wanting something to happen for real with her. It's something about an older woman who is confident and subtly sexy that makes my cock swell in my pants until I have the all-consuming desire to rub one out in privacy since there is no way anything sexual could happen in real life. My step-sister swore she wouldn't say a word to anyone about my secret and as far as I knew she hadn't. I came home from college early today to find my step-mom alone in my step-sister's bedroom, reading what appeared to be a diary. My step-sister wrote the secret I told her in her diary and now my step-mom read it and knows exactly what I desire.