When I was 13 I was at my friend Casey's house for a sleepover. It was late and we were getting bored so we decided to play truth or dare. When it was my turn I asked dare. Casey told me to sneak into her parents room and grab a book about sexual positions and sex tips from her mom's dresser.
I tipped-toed to their room and peaked in. They were sound asleep. I snuck in and took the book from the dresser and ran back to Casey's room. Giggling, I handed her the book. She showed me pictures she thought were funny. We laughed at the picture of a couple doing 69 and a picture of a guy putting his dick in a girl's butt. The funniest picture in the book I thought, and also turned my on, was of a guy ejaculating in a girl's mouth. After seeing that picture I really wanted to masturbate.
After a while Casey hid the book under her bed and we went to sleep. I waited until I was sure she was asleep and grabbed the book and headed for the bathroom. I flipped to the page of the guy cumming in a girl's mouth. I took off my clothes and looked for something to pretend I was sucking a penis while I masturbated. I found a large sharpie marker. I pretended I was that girl as I sucked and masturbated. I was imagining what sperm must taste like when I felt an orgasm coming. I started to rub my clit faster, I squezed my small breasts, and arched my back and finnaly reached an orgasm. As I was cumming I shot a squirt of liquid on the floor. I thought I peed but it didn't look or smell like it. I cleaned it up and went back to my sleeping bag.
I continued reading and masturbated again in my sleeping bag. This time I had a even more intense orgasm. I let out a tiny squeak. After this I fell immediately to sleep. When I woke up Casey asked why I had the book out, yelled at me because her mom or dad could have walked in and seen it. I said I was sorry and gave it to her.