Playing With Sister

I am a big fan of the site and have always wanted to contribute. One day, I was reading this site and masturbating to the female-female stories. My sister(12) walked in and asked me why my 'pp' was so hard. I told her it was because I was horny. She asked if she could touch it, and I said sure. After a while she asked me how to get it unhorny. I told her that she needed to rub her hands up and down on my 'pp.' She gave me the best orgasm I ever had.