My sister looked back with unfocused eyes and panted, “Not yet,” grabbed my hair again and began to toss and twist while gasping for breath. She ground her hips against the source of pleasure between her legs and growled deep in her throat. She shuddered one final time then fell back onto the grass completely relaxed. I wasn’t sure but I guessed that she had just had an orgasm. She was still for a moment then opened her eyes and looked up at me, “Damn.” She glanced down at the mountain in my pants and offered “Let’s go back to the camper, mom and dad left on the bicycles. They’ll be gone most of the day.”
When we got back to the RV we found a note from our parents. It was a list of chores and that we should have dinner ready by dark when they came back. Madison grabbed a pencil and scribbled another line at the bottom of the list. She handed me the paper then stepped behind me. The last line, in her handwriting said ‘Fuck Madison.’ I turned around to face her just as she was stepping out of her summer shorts. She nodded toward the rear of the RV and said “Let’s go back there.” I reached for my sister but she darted past me toward the back of the camper, kicking her panties off her feet as she fled. She launched herself through the air and landed on the bed, laughing at me, teasing me while she pulled her shirt over her head and tossed it in my direction. The bra was last, she dangled it briefly from her fingers then grinned as it fell to the floor. I followed the scattered trail of Madison’s clothing to the rear of the RV. I’d never seen any girl completely naked before and my heart lurched in my chest when I saw her; my semi-hard dick became her plaything in seconds.
Madison is about 5’3” and small, I guess petite is the right word. She couldn’t have weighed much over 100 pounds but she packed a lot of that in her tits. They were full, round and the nipples were stood firm from rose pink circles of skin at the end of her breasts. I was trying to pull my pants off while stumbling toward her. She giggled at me, watching me fumble with my clothes, trying to shed my shirt and pants at the same time. “You’re never gonna have sex if you can’t get your clothes off any faster than that” she said mockingly. I finally managed to kick my pants into a corner just as I reached the bed. I threw myself at her and tackled her as she tried to squirm away from my grasp. My erection was throbbing, swelling even harder as we wrestled. I knew that if I couldn’t relieve the pressure soon, it would split open like a sausage on a grill. Madison managed to maneuver out of my hold, threw her body over mine and tried to pin me down, she was laughing gleefully as she sat on me, pinning my arms to the bed. She was straddled across my chest and I was looking at her slit just inches from my face. My sister started to say something but I didn’t hear her over the thunder of blood in my ears. As I looked at her sex crack partially covered by soft dark curls something wild and instinctive streamed out of my balls directly to my mind.
I wanted to lick her pussy.
I sat up with her still on my chest; she fell off backwards to the bed. I shifted around until she was tucked under me and kissed her on the mouth. I lifted up and slithered down the bed until her pussy fell under my gaze. Madison rocked her hips, arched her ass off the bed and I flicked my tongue on the beginning of her crack. The musky scent of her sex inflamed my desire and the brief lick sent a flood of sensations through me, my cock strained even tighter against the skin holding it together. I put my lips on her pubic mound and kissed it. I heard her suck in a rush of air as her body rose off the bed again to meet my mouth. I moved my lips downward to the lips of her pussy and kissed her solidly, then flicked my tongue against her. That time she groaned out loud “Ooohhhh!” I liked the taste of her, she was slick with lust which I began to lick from her. She bucked her hips and moved up the bed as I sucked on her vaginal lips. I could have stayed between her legs for the rest of the day but my balls were screaming in agony, my cock tearing at the seams. I abandoned her sex then pulled myself up and covered her body with mine. My sister looked up at me with wide wild eyes and rasped “Why did you stop?” I didn’t answer, I only widened my legs between hers forcing her thighs apart. I rolled my butt and put the end of my erection where my mouth had just been. She moved under me until the head of my cock slipped into place then I drove it home, hard and deep. Madison gasped again and arched her back, lifting her hips completely off the bed as I started to fuck her. This time we didn’t need to be quiet or secretive. The longer we had sex the wilder we got. She was tossing and thrashing under me, twisting the blanket with her fists. A pillow got knocked to the floor and in seconds the other followed it. Madison was thrusting against me, moaning sweet agony every time our bodies slammed together. I was driving into her faster and harder, our stomachs slapping loudly when the heat finally split my erection wide open. I felt another explosion in my nuts and a river of semen and sperm poured into my sister as gushes of liquid fire.
I got off Madison but my knees were too weak to hold me up so I sat heavily on the bed next to her prone body. She rolled to her side and kissed my thigh and felt between my legs for her new plaything. My prick was coated with cum, still rigid. She stroked me with two fingers then put them in her mouth to taste my discharge, “That was a hell of a lot better than what that asshole did to me last week.”
“You told him you don’t want to get pregnant, what about now? Aren’t you afraid I’ll tag you?”
Madison rolled to her back giving me an enticing view of her nakedness and replied “Last week after what we did, I got scared and told mom what happened. She asked me if I was going to have sex with him again and I said ‘I don’t know; I might but he didn’t pull out like he said.’ Mom and I talked for a while then she asked me if I wanted birth control. I told her I wouldn’t take the pill so she made an appointment with our doctor. I got a little thingy put inside me four days ago. It’s supposed to work until the doctor takes it out.” Madison looked up at me with flames building in her eyes and said “I can fuck anybody I want, any time I want and I’ll be safe.” After a short pause to let me digest her words, she continued, “Can you do it again?” My cock twitched in anticipation of another dip into my sister. We spent almost two more hours on the bed, she let me fuck her three more times. We finally had to get up and clean the bedroom then finish the chores on the list.
By the time we returned from vacation Madison and I had screwed each other at least twice a day. Most of the time when we were on walks alone but got two more afternoons in the RV when our parents left us alone. The second time we used our parent’s bed Madison had her first orgasm while I was fucking her. At first it was a light shaking in her legs but as the climax grew in intensity her body convulsed and trembled as the sexual tidal wave washed over her while I injected doses of hot fuck juice into the tender recess of her body. She put a long scratch on my shoulder when she reached her second peak; I had to keep a shirt on the rest of the trip so mom and dad wouldn’t see it.
My sister started dating some other guy and I was no longer shy with girls; I quickly found a girl in my class who would have sex with me. Even though Madison and I were both getting laid outside the house we found time enough to be with each other a couple times a month. We used those times together to experiment, suggesting and trying new positions and sex stuff. Once we were satisfied with each other, we used our new-found pleasures on other partners.
Neither Madison nor I went with our parents again on those summer trips but my sister and I screwed steadily until she moved from home. Even now when one of us goes to visit the other, we occasionally end up in bed, laughing and giggling just like we did when we were little. Only we aren’t so little any more.
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