Someone had to show her

Summer had just rolled around before my senior year of high school. I was having a good summer but in early July my girlfriend at the time decided to end things. So for a few days I wasn't doing much and wasting a lot of time on the internet. I had just got my own laptop for my birthday, but the family desk top was in my room. One night my mom was out and my sister Katie was in the room using the computer to browse myspace or something. She was 13 at the time. I was laying down on my bed across the room with my laptop open. As usual I was on solo touch reading stories and giving myself such a hard on. I had taken a liking to reading brother/sister and first time stories at the time (I still like them) and had started thinking about it. Soon enough my sister got bored on the computer and came over to see what I was doing. I don't know why but I didn't bother to close or switch the window and just kept reading my story as my sister lied down next to me in bed. My sister saw and started reading herself and was intrigued. She asked to read another. Next thing I know we were looking through the archive choosing which ones to read together. I was so worked up and wanted to touch myself. Finally it was her that broke the ice and asked why people did this. "Because it feels good" I told her. "Haven't you ever touched yourself?" "No. why would I?" She responded. "I'm not a guy. I don't touch myself all the time." This wasn't the first time she had made a comment about me masturbating. She thought all guys did it and only guys did it. She didn't know girls could too. In retrospect I think she was curious about it. We read a few more and she kept making comments. Finally I said, "You know what? You're gonna have an orgasm tonight. You keep making fun of me but you don't know what you're talking about." I grabbed her right hand, lifted up her waste band, and shoved her hand down her pants. I used my hand to guide her into making circular motions and went back to reading. "Don't stop" I told her I couldn't believe how bold I was. I was there sitting next to my sister who was touching herself and I desperately wanted to touch her too. She wasn't just my annoying little sister. She was going through puberty quite nicely. She was thin, but not awkward and was developing a nice chest. But my mind was where my sister's hand was: between her legs. "You're going through puberty, right? so does that mean you've grown...." "Pussy hair?" she finished my sentence. "Yeah, that." "Yeah. What, you wanna see it?" she said sarcastically. "kind of" She then took her hand out of her pants and pulled the front of them down just enough to reveal to me her little black bush that had been growing. It was actually really nice. Not too big or thick, just right. After a moment she put them back up and went right back to what she was doing. A minute later... "I don't really know what I'm doing." She said. "It doesn't feel good?" "Like, kinda.. but I don't know what I'm supposed to be doing," She paused for a minute and then asked "Do you think you could maybe.. help me?" "Help you?" "Yeah, just this once so I know what I'm supposed to do." "uhm... ok. I don't see why not." I was dumbstruck about all this. I couldn't believe this was happening. I put my lap top aside and positioned myself next to her. "Do you think you could....?" before I even finished my sentence she took her pants off. There she was, right in front of me, that cute bush out in the open. I bit my lip and put my middle finger right between her slit. The second I made contact she let out a loud moan. Her pussy was so wet and I could smell her. With every circle my finger made on her wet slit she was moaning louder and louder. She grabbed one of my pillows and started to bite and moan into it. As I was using my hand on her she started to buck her hips. "Stop! Stop!" she screamed. "What? Are you ok?" I was afraid I'd hurt her. "No, I feel like I'm gonna go pee." I knew enough about what I was doing to know that feeling meant she was about to orgasm. I told her that. She was breathing heavily so I thought I'd give her a bit of a break. I repositioned myself between her legs so I could get a good look at her pussy. She has such a beautiful pussy. I was entranced looking at it and touching it softly. "Do you want to keep going?" I asked her. "You were so close to that orgasm." "Yes. I want to know what it feels like." I didn't use my finger to go back to the job. I had a much better idea. I was already between her legs so I lowered my head and started licking that beautiful pussy. When my tongue touched her she started moaning again and rolled her head back. I had never performed oral on a girl before. I liked it. No, I LOVED it. To this day its one of my favorite things to do. I licked her all up and down taking in every second of it. It wasn't long before she was bucking her hips again. I grabbed on to her and kept licking her yummy pussy. She kept moaning louder and louder until the moans became a silent scream. I knew right then I had just given my sister her first orgasm. I pulled away to see her recovering. "Did you like that?" She couldn't speak and just nodded her head. By this time I was so horny I had to get off. I told her it was my turn. I laid back, pulled off my pants and started jerking off harder than I ever had. My hand was a flash on my shaft as the memory of going down on my sister was still in my head. Next thing I know she had sat up next to me and was looking. "I want to see what happens. I've never seen a guy jerk off," she said. So I kept pumping as I watched her transfixed on my cock. Then I had another idea. "Do you want to touch it?" I asked. She didn't answer, just reached for my shaft and started moving her hand up and down as she just seen. "Like this?" "Yeah, but a little faster" I instructed. I laid back and let my sister give me a hand job. She wasn't bad, I felt it building up as she worked her big brothers throbbing cock. Before long she had made me squirt 4 big ropes of cum. Have been hard for that long it felt so good and knowing she did it made it even better. "Wow" she said as she touched it with her finger. By that time it was late and we were both spent. Our Mom had just got home so we went to bed. I slept good that night. Sadly, we never did anything like that again, which is probably for the best. But I will never forget the night I gave Katie her first orgasm.