My name is Steve, I'm an 18 year old male from California. My sister Ashley is 16. Let me describe our life. I'm 5'9" tall, around 200 lbs, not fat, but not exactly a bodybuilder, black hair, brown eyes. Ashley is about 5'4", no more than 110 lbs, dirty blond hair, blue eyes, and a great body- 36C tits, shapely legs, and an ass to die for. This story took place a year ago, so we were 17 and 15 then.

"Steve! I need you to drive me to school!" Great. I just got my liscence and now she's already bugging me for rides. I was supposed to leave the house in 2 minutes, and now it looks like I have to take my baby sister with me. Just my luck.

"Well, hurry up, Ash. We're leaving in 2 minutes!!!" I yelled up the stairs to her. "I'm gonna go start the car."

I started my car and waited for Ashley. And waited. And waited. After 10 minutes she finally came out and got in the car, not even offering an apology. I was pretty pissed off, because this meant I probably wouldn't get to school on time to mess around with my girlfriend.

As we drove, Ashley prattled on about some guy she was interested in. I really wasn't paying attention, because her short skirt was extremely distracting. I had always found her very attractive, and because of that I tended to stare once in a while, but she never really noticed. As she talked, her skirt rode slowly up her legs until it was mid-thigh. I had gotten quite a hardon from the show, but luckily we were nearing the school. As we parked, she thanked me for driving her and gave me a peck on the cheek. I stared at her ass as she got out of the car, and was rewarded by her skirt riding up to show a white thong on her beautiful ass.

I entered the school ten minutes later, after my extensive car-locking ritual (I am a bit paranoid when it comes to my 1958 Plymouth Fury).  As I walked through the halls, I realized I had missed the first 15 minutes of class. I walked past the room where my girlfriend Carrie had class and stood by the door. From her seat in the back she could see me perfectly. I made a motion with my hand telling her to "hurry" and pointed to my left, then left the door.

I waited near the room as she asked to go to the bathroom. As soon as she walked out, I grabbed her by the hand and led her down the hall. We ducked into a janitor's closet with a broken lock. Before she could say a word, I kissed her, forcing my tongue into her mouth. My hand slid up her shirt and began to fondle her B-cup breasts. I pulled her sweater off and tossed it onto a box nearby. Topless, she quickly got on her knees as I pulled my stiff cock out of my pants. "My god..." she whispered. I looked down to see what had shocked her. After all, it wasn't the first time she had seen my dick, why should she be surprised?

As I looked down I quickly realized what it was. The head of my dick had swollen to triple its normal sizem and the whole thring was throbbing like I had never seen before. Carrie looked up at me and smiled. "Boy, you must need this bad, huh?" I just groaned as she took my rod in her mouth. Within just a few seconds she was in her usual perfect rhythm of up, down, up, stop....down, up, down, stop... After just five minutes I couldn't take any more. "Oh...baby...I'm cumming..." I quickly shot a massive load down her throat. After about 30 seconds I finally stopped cumming, and she had to struggle to swallow it all.

"Oh, god...I don't think you've ever shot that much, Steve!" I looked down at her and smiled. "Well, you did just give me the best head of my life, baby." I figured that was the right thing to say...after all, I wasn't going to tell her that I was so horny because I was imagining she was my sister. Somehow I didn't think that would work.

"Well, I have to get going," she said. As she reached for her top, I grabbed her hand and led it down to my still hard dick. "Steve, I don't think we have time for this..." I checked my watch- she still had another 10 minutes to make it back to class in time for the bell. "Oh, but baby, I need this so bad..." I kneeled down and pulled down her jeans, revealing a cute blue thong. She let out a low moan as my tongue lapped at her vagina right through the thin fabric. Not wanting to waste any more time, I stood and turned her around as I pulled her thong off and put it with her top and jeans.

After bending her over a box, I quickly slid my aching pole into her tight, wet pussy. She began to moan as I pumped slowly in and out of her, and she started to play with her tits as I fucked her. Carrie loved to feel up her tits while she got off, and I didn't mind the show. Today, though, I wasn't paying attention. In my mind, I was fucking my 16-year old sister instead.

As I started to go faster, Carrie's tittie-play got rougher, and she was soon pinching her nipples as hard as she could. I pumped faster and faster, watching my dick slide in and out of her sopping-wet cunt. She started to talk. "Oh, oh, oh, oh...god, yes, cum in me...". I was getting close, and she could feel it. About a minute earlier than I hoped, Carrie orgasmed, and she started to get tired. I could tell her poor little pussy was getting sore, so I quickly imagined that it was Ashley's snatch I was fucking. Instantly, what seemed like a gallon of cum shot into Carrie, and she let out a low moan as I filled her with my seed.

"Thanks baby" I said as she started to lick all of her juices and my cum off my dick. For a second, I imagined Ashley's pretty face down there, and I was hard as a rock immediately. As Carrie gently licked my cock, I grabbed her by the hair and forced my dick all the way in. I began face-fucking my girlfriend as thoughts of my sister ran through my mind. Carrie tried to keep up, but she was just too tired. Too soon, my cum shot down her throat, and I almost collapsed from the exhaustion of having three massive climaxes in less than twenty minutes. Carrie quickly put her clothes on before I could change my mind again, gave me a kiss, and left for class.

By the end of the day, I had met up with Carrie two more times, both times resulting in at least two blowjobs and one fucking. As the bell for the last class rang, I headed to my car only to find Ashley already waiting for me. I stared at her breasts pretty much the whole way home.

This continued for weeks. I would drive Ashley to and from school, building up insane amounts of horniness, and then I would use my poor girlfriend as a cum receptacle. Little did I know that things were about to change...