I don�t think there�s any argument that the configuration of siblings in a family determines how they grow up. The relationship between two brothers or two sisters is quite different from that between a brother and a sister — much less among a family with four or five or six assorted kids, but I have no personal experience with that sort of dynamic.

Anyway, one of my best friends growing up had a kid sister who looked up to him (usually) and I�m convinced that formative experience helped turn him into the sort of confident social leader he is now. My own time growing up was different, mostly because my only sibling was a sister five years older than me. I hasten to say that I came out fine and I�m as happy and successful as anyone can reasonably hope to be — but my relationship with Laura definitely colored my personality.

Not surprisingly, she was the dominant one, simply by age seniority, but she wasn�t especially domineering — or no more than is usual for a teenage girl saddled with a considerably younger brother. For my own protection, I had tried from a young age not to be a nuisance to her, and I had mostly succeeded. She generally left me alone to pursue my own affairs. But during her teenage years, Laura could also be a little strange around the edges.

How strange, I finally learned one afternoon in July of my thirteenth year. I was walking back from the local branch library and I happened to discover a half-pack of cigarettes in the grass adjacent to the bus stop a couple blocks from our house. I assumed they had been dropped that morning by some commuter and I snatched them up and buried them deep in my backpack.

Laura was going over to a friend�s house for some reason — she was in the middle of getting ready to head off to college in a few weeks — and our folks were at an antique show for the day, so I had the house to myself for the afternoon. I had never smoked a cigarette in my life and, while I understood all the reasons one ought not to smoke, I was nevertheless intrigued by the mystique of it all.

With my newfound treasure in hand, I had established a "smoking station" at the window of my upstairs bedroom, which overlooked the back yard. The sash was up and I had set a desk fan on a nearby stool, pointed toward the window, to encourage the smoke not to linger. (Mothers have a notoriously well-developed sense of smell.) With the window open, it was pretty warm, so I had shucked my tee-shirt and was wearing just a pair of soccer shorts.

I was trying to work out how to get through that first smoke properly. I got the thing lit with a kitchen match (and at the end without the filter, too), and was about halfway through it, carefully tapping the ash into a nearly empty Pepsi can. I wasn�t feeling nauseated or anything, and I figured that if it continued to go well, then on the second cigarette I would attempt to actually inhale, rather than just holding the smoke in my mouth for a few seconds and then blowing it out the window screen. I had my earbuds in and was listening to some old Metallica on my iPod, which made me feel even more sophisticated. But that music was my downfall.

So I was sucking on the thing, thinking about the strange taste as I stared out the window at an industrious squirrel, when a hand suddenly appeared over my shoulder and snatched the cigarette from between my lips. I jumped about an inch and spun around. Laura was holding the butt between two fingers, shaking it at me and scowling.

"Dammit, Kevin, you know better than this! If Mom catches you smoking, she�ll ground you for a year! Especially doing it in the damn house!"

"Yeah, okay, I know." I reached for the remains of my smoke but she jerked it back out of reach. "It was just an experiment, okay?"

"Where�d you get them, anyway?"

"I found them. Someone lost them waiting for the bus. Nobody sold them to me." I reached over and slid the rest of the pack out from under my pillow, since she was obviously going to confiscate them anyway. She snatched them from my hand, then carefully ground out the lit one on the lid of the can and stuffed it down through the hole. I heard it hiss in the tiny amount of drink I had reserved there for extinguishing purposes. Yeah, I�d had this little adventure all planned out, all right. Except for my sister�s early return.

She set the can on my desk with a clank and stuffed the open pack in the pocket of her short-shorts. "Christ, Kev — you ought to be spanked, you know that?"

Now she was annoying me. "Oh, fuck off. Besides, you�ll just go and smoke the rest of those yourself."

She jabbed me on my bare collarbone with a hard finger. "Don�t push your luck, little brother."

Besides still being a couple of inches taller, Laura was also much more athletic than I was. She was an avid swimmer and tennis player, and I had learned long ago that she was perfectly capable of knocking me on my ass if she chose. So I just gave her an aggrieved look and said "Oww. . . ."

Then her expression changed. She looked me up and down, still sitting there and dramatically rubbing at my wound. "You know, I think that�s exactly what you need — a spanking."

I just stared at her. "Fuck you. Nobody�s spanking me."

Then she let me have the killing blow, just as I knew she would. "Then I�ll tell Mom."

She would, too. And she�d word it such a way, and in such a carefully concerned and mature tone of voice, that Mom would have no doubt of her daughter's moral superiority. And I really would be grounded. I had no real alternative. I closed my eyes and sighed in resignation.

She backed up and sat on the edge of my bed — a platform thing, not very far off the floor — and beckoned to me. I stood up with another loud sigh, and then stopped and stared at her when she patted her knees. I was supposed to lay over her lap, like a three-year-old? Christ.

So I started to arrange myself across her knees, but she held up a hand. "Pants off, little brother. We�re going to do this right."

I gave her another disbelieving stare. She returned a slightly crooked smile and made a get-on-with-it gesture. I slowly pushed my shorts down and stepped out of them, straightening my briefs as I finished.

"Everything, Kev. C�mon."

Now this was definitely getting weird. I hadn�t been naked in front of my sister since I was in diapers. My heart rate picked up a little as I bent again and shoved my underwear down, and just stood there and let her look.

The thing is — and this wasn�t something I actually thought about much — my cock was substantially larger than the adolescent male average. I knew this from making surreptitious comparisons in the showers in gym. It was longer and thicker than any of my classmates, even the tall junior varsity basketball players. None of the guys ever mentioned it, of course, but they all were aware of it. And now Laura was staring at my equipment close-up and her eyebrows were up near her hairline.

"Jesus, Kev. When did that happen?"

I just shrugged. I mean, what are you supposed to say?

Laura reached out slowly and I thought for a moment she was going to grab my dick — maybe she thought so, too — but after an instant's hesitation she just took my wrist and steered me down across her lap. I wasn�t exactly aiming for it, but I settled with my cock tucked down between her thighs. I could feel their warm smoothness and my cock twitched once.

"Stop that," she said quietly. Then she commenced the spanking. Only it wasn�t what I was expecting. Knowing Laura�s strength, I had braced myself for a stinging slap. Instead, it wasn�t much more than a pat. Something seemed to have changed in the last thirty seconds. There were a couple more very light blows, then a positive caress as her palms moved over the curves of my ass and my lower back and up and down my thighs. I could feel my erection growing. So could she. I wondered tensely where this was going and what exactly was happening.

Then she spread my cheeks. Just the knowledge that my big sister was staring at my asshole made my cock expand even more. I felt her shift her legs slightly, squeezing my increasingly rigid cock between her thighs. Then she began pressing the tip of one finger against my sphincter, twisting it to work it in a tiny bit. Laura kept her nails short because of the sports, fortunately, and what I felt was a small jolt of electricity. I know I jerked, and I know she felt that, too.

"You like that, do you, little brother? Interesting." She moved that exploratory finger again and I twitched again. "Hmmmm." Then she removed her finger and prodded me in the hip. "Up."

I scrambled up and began to reach for my clothes, but Laura grabbed my arm. "Not so fast." Then she got up, too, and gave me a little push toward the bed. "We�re not finished. Get down on your hands and knees." I must have looked apprehensive because she winked at me. "You�re going to enjoy this, trust me."

So I knelt on my bed on all fours, my cock sticking out at a sharp angle beneath my stomach, and looked over my shoulder. "Down on your elbows, Kev. Stick that cute ass up in the air for me, and spread your knees apart."

Now, perhaps I should note that, while I was definitely still a virgin at this point, as were all my buddies, I wasn�t totally ignorant of the mechanics of sex. It�s not that difficult to find some very explicit video clips online, and through a good deal of fascinated repeat viewing when I was alone at night, I had acquired what I felt was a pretty thorough theoretical knowledge of the subject. And it seemed to me that this pose my sister had instructed me to adopt was more appropriate for a girl who was about to get fucked from behind. What Laura expected to accomplish, I couldn�t quite envision. But I quickly found out.

I kept a small jar of Vaseline on the floor beside my bed, next to the box of tissues. Its official purpose was to prevent chapped lips when my sinuses got jammed up, as they often did in the summer — but, of course, it had other uses. Which I discovered when my sister scooped up a dollop of it on her finger and spread it all around my asshole. Then she began working a long, slender middle finger up inside me, rotating it as she went.

The sensation was like what I imagine you�d feel if you stuck your tongue in an electrical outlet. I was suddenly lightheaded. I found myself making trembling fists in my sheets. I was on the verge of a cramp in my thigh from the sudden tension in the muscle. And I know I was making a strange sound in the back of my throat. After a few moments, her finger was all the way in there, but it felt like her whole hand. When she flexed the joints and twisted, I thought I might faint.

Laura shifted position, but without moving the invading finger. She reached forward between my thighs with her other hand and her fingers wrapped around my rigidly swollen penis and tried to tug it back toward her. That was a bit uncomfortable — but in a good way. No one had ever handled my dick but me, not that I had any memory of, and it was an amazing sensation. When you jerk off, there are no surprises, right? You can feel yourself touching yourself and you know it�s you. But when someone else handles you, it�s all unexpected, from one second to the next — especially when you can�t see what�s happening. Then add to that the forbidden sensuality of your own sister doing it, and on her on initiative. But there was more to come.

I had about one second�s warning, from the warmth of her breath, and then her tongue curled around the head of my straining cock. She licked the tip several times, then dragged her tongue up the underside until she reached my balls. She took half the shaft into her mouth (which was all that would fit) and applied suction. And then, . . . God. She sucked both my balls into her mouth at once and pulled back a little to create a strain. And at the same moment, she flexed her finger deep in my ass and then slid it in and out, basically finger-fucking my ass. I nearly lost my mind.

Later on, I tried to imagine what it might have felt like if my sister actually had fucked me in the ass, like with one of those strap-on dildo rigs I had watched lesbians use on each other in the online videos. It would have been much larger than her finger, of course, but assuming it was well lubricated and everything, . . . would I have liked it?

Yeah, I think I would have. Sex is sex, right? And this was all new to me. I was pretty much open to anything. None of my close friends were gay — that I knew of — but if one of them had been, and if I had somehow gotten into this position with him, . . . well, I don�t know, that might have been different. I have no problem with gays, you understand, or even with the idea of two guys having sex with each other. To each his own. It just isn�t my thing. But this was Laura, and she was definitely a girl. And I found I was very much in favor of her doing things to my ass while sucking my cock and trying to swallow my balls.

So this went on for a minute or two, her moving my balls around in her mouth with her tongue while her finger pistoned slowly in and out of my ass and her other hand slid up and down my cock. My brain wasn�t really functioning at this point, but I knew I was going to explode at any moment.

Laura must have realized it, too, because she suddenly released my balls, flipped over on her back, and pushed her head back between my knees — all while drilling her finger as deep into my rectum as she could. She took my cock into her mouth again and without thinking about it, I spread my knees farther apart. The head of my dick pushed back into the top of her throat and I was vaguely aware of her struggling not to gag.

And at that instant, my mind a tightly focused pinpoint, I erupted. I jerked and shot what felt like a quart of semen past her tonsils, directly into her stomach. Another jerk, another load following right behind the first. Then two or three smaller loads, by which time I�d regained the presence of mind to pull back a little so she wouldn�t strangle. She stuck with it, though, and didn�t try to push me off.

After another thirty seconds or so, with me gasping and trembling, Laura withdrew her finger and gave my ass a pat. Gathering my wits — and being careful not to lose my balance and plant my knee in her face — I rolled off, got turned around, and collapsed beside her. She grinned at me, semen smeared on her lips, and slipped her hands down between us to give my cock a final squeeze, milking the last bit of semen out to dribble over her knuckles.

I don�t think it�s common, but I�ve found that after I come, it still takes my penis a minute or two to deflate. Kind of a slow process, and it meant that my dick was still large enough to nearly fill both her hands wrapped around the shaft, one above the other. When she discovered this, she just looked at me, eyes wide, and whispered "Wow."

Laura went off to take a necessary shower a few minutes later and I just lay there naked, thinking about what had just happened. Mostly, I wondered if there was going to be a repeat performance. There might have been, I don�t think my sister would have objected, but the opportunity didn�t arise. One or both of our parents were around all the time, and then the morning came when we all got in the minivan to drive Laura off to her freshman year, and that was that. The next time I saw her, the following summer, both our lives had changed enough that we just never got back to that strange place.

So, how did this experience change my personality? Hard to say. My junior year in high school, I got together with Beth, who was even more of a geek than I was, so we bonded first as friends with similar interests. Our relationship escalated from there. We were never under the illusion that we were in love or anything, but we became very close — and, eventually, we were "sex friends," or whatever the current term is. We lost — or gave — our virginity to each other. Then we got together frequently, and privately, and carried out exploratory experiments with each other. She was perfectly willing to wiggle her finger up into my ass, in return for which I was more than happy to lick her pussy to orgasm. We even watched some of those online videos together, in the spirit of research, which led to anal sex, a little light B&D, and similar departures from the ordinary.

After graduation, though, we went off to different universities five states apart. Our parting was a little sad, but we were under no illusions about that, either. And I had no problem finding a couple of willing fellow explorers my first term in college.

Now I�ve been out in the world a few years, I earn a nice living, and my social life, while relatively quiet compared to some of my friends, is more than satisfactory. And I�m still single. So is Laura, perhaps oddly. And my big sister, who is self-employed and appalling successful, is shortly going to be in town visiting clients for a few days. She emailed me to see if she could crash at my place, to save on expenses. I replied that my apartment wasn�t terribly large and that I had only the one bed, but that she would certainly be welcome. And she replied back that one bed was "more than adequate." I suspect there may be some more exploration in the offing.

Copyright 2014 by Michael K. Smith. Copies may be made and posted elsewhere for personal enjoyment, but all commercial rights are reserved.