Mary's brother's turn

Note : This story is completely fictional!

Mary watched me walk in and sit down, a wicked grin on her face. “I knew you were watching, you know,” she said, getting up and slinking over to me, “I always know when you’re peaking. Everything gets quiet in your room.”

She had me, of course. I had watched just twenty minutes ago when Mary had fucked the boarder who lived downstairs. He is a very muscular man of twenty five or so and had easily seduced my 18 year old sister in her own bed. Mary wasn’t wearing her usual pedal pushers and tee. She had on a tube top and gym shorts that fit her last year and looked very sexy in a pubescent way. There was only the hint of breasts, but the tightness of the shorts and top made her look rounder than I had never noticed her being before. Despite the little sex games we had played as long as I can remember, I had never thought of her as old enough to really have sex. Then I saw her spread her legs and let a big man play with her pussy and then, with her help, put his cock in her and fuck her And now she was straddling my lap and french kissing me.

“I want to fuck some more. Herb was afraid of getting caught, but I want more. Where can we go?
And it was a poser. The parents were due home any time, we were both randy as goats, I could feel precum wetting my shorts, and caution didn’t seem the order of the day. I picked her up and carried her , her legs still around me, to her bedroom and flopped both of us down on the same bed Herb had just fucked her on. There was only a couple layers of nylon between our genitals, but it seemed like a straight jacket. I wanted what Herb had got, and what I had been thinking of for all these years. But every little sound from outside spooked us, just as any sound close to us in the house when we were playing around had always spooked us.

“Quick, my bed.” I pulled Mary up and we ran to my room. She could see right away what my thought was. I often used my window to come and go, and it was on the other side of the house from the driveway. We were naked before we got to the bed, both wanting to fuck first and think about it later. She spread her legs for me and I pounced on her, intent only on ramming it home and fucking her ass off as Herb had done. It didn’t work like that, of course. AS mightily as I pushed, I wasn’t hitting the mark, and as horny as Mary was, she couldn’t coordinate her pussy to meet my onslaughts.
“Lets go a bit slower”, Mary whispered. “Do what Herb did. I’ll show you.” She made me get up to my knees. She drew her knees up so I was looking straight at the sweet little cunt I’d seen stretched open just minutes before but now wouldn’t let me in. What hair she had was just on the mound in front, her lips and bum were still smooth as a baby’s . I was fascinated as she pulled the lips open, ever wider, until I could see the hole opening, glistening and twitching. I touched in with a tentative finger, feeling the softness and tenderness, suddenly aware how coarse and rough my hands were. I had thought to put my finger in her, but couldn’t think to hurt her with a rough nail. She too felt the rough nail, and we both knew there was only one tool for the job.

This time we went slow. I kept myself lifted off so she could get both hands to guide me in. I thought of the jell I had seen Herb use to slip in and wished he had left it, hoping against hope that I wasn’t going to be thwarted this close to home. I felt Mary’s pussy as she slid my boner down between her labia, and pushed gently when she told me to. Wonder of wonders, I felt her envelope my head, and I could feel the slipperiness of her own juices. I guess some of mine to, because by then I was starting to cum with every movement. I wasn’t worried about cumming too soon, because at that time I didn’t know about that problem. All I wanted was IN, and even being overly careful not to hurt her, I could feel myself deeper with every thrust, and then our pubes were together, and Our bodies were together, and our tongues, and we were fucking.

I revelled in the feeling of Mary’s body on mine, how buoyant and receptive all parts of her seemed to be. I marvelled at how happy she was to have me in her. I knew Herb was a lot bigger, but she was getting off on my cock just as much as she had got off on his. I didn’t have a huge cum, much as I would like to relate for the sake of this story, but the fact is, I was so excited and worked up I came even while I was making entry. But it was still great seeing the orgasm I could give Mary, and then, when I thought it was over, seeing her start over and cum again..
We lay quietly, letting her play with my cock with muscles she didn’t know she had in her cunt, frequently making my cock jump in reply. I felt myself getting bigger again, and thought it might be fun to go again, but both of us were still listening for the car, and were sated enough for the moment to let sense prevail. But I did pull out slowly, as if promising to return, and Mary let my hips slip through her hands reluctantly, letting me know she would be available.

Then we had the practical matter of covering our tracks. We both knew if the parents saw us now and together, they would know we had been up to something. Maybe not as much as we really were, but certainly playing with fire. Mary returned to her room and then ran a bath, figuring that would explain the colour in her face and generally healthy glow. I was out the window and on my bike, miles away before they actually blew in late, an hour later.

As Mary and I walked to school yesterday, we were both shy and coy. What had gone on two days before was still fresh in our heads, but we hadn’t had the chance to talk about it. Now neither of us knew how to broach the subject. My mouth was quite dry as I made myself say, “So, when can we do it again?”

Mary face lit up and I thought she was going to hug me right on the street. “I was afraid you were sorry we did it. I can’t wait to do it again. Can we do it tonight? Do you know where we can go? Maybe mom and dad will go out.” She bounced up and down, and I wondered how I could have thought she was a little girl, with that pert little bum rounding out her jeans. I even thought I could see swelling in her blouse. Then her friend Joanie joined us and we could talk no more. But I did notice that Joanie was a bit fuller in the body than Mary, and wondered what she might look like stripped down.

As I peeled off to go to the high school wing, Mary had a thought, and caught up with me again, “Aren’t mom and dad going to an art show Thursday?’
My cock twitched despite myself, “Do you think Herb will be around?”
Mary flounced her little chest, “If he is , you’ll just have to take turns!”, and skipped away, incorporating max wiggle.