When I arrived that day, I had no idea what was about to happen. Sex was the farthest thing from my mind. Just a nice visit with my big sister over the weekend, while stopping in on a business trip. If I had known what Cheryl had in mind, I probably would have never stopped in, or have run away immediately. On the other hand, maybe I would have stayed anyway ....

"Danny, did you fuck your little sister this morning?"

If the chair I was sitting in wasn't a big sofa with arms to hold me in, I probably would have fell out of it. In the first place, a question like that is one that you would NEVER expect your sister to ask her own child. In the second, even if she did, you certainly wouldn't expect her to air dirty linen like that in front of her little brother ... or any of her family or friends, for that matter.

"Oh, Mom!" was the expected response from the 16-year-old boy. The disgust at even being asked. provided the denial of his mother's accusation. "I haven't even been in Tanya's room, so how could I?"

I barely had time to start wondering what had made my sister suspicious enough to even ASK such a question (let alone in front of me) when she continued, "Danny Michaels ... I'm ashamed of you ... treating your own sister like that. Now you go get Tanya and Mindy too, and get out here in the living-room, so your uncle and I can watch you."

"Yes, Mom." A sigh of resignation.

"And don't go acting like it's some kind of chore. Or do you want me to ...." Exactly WHAT Cheryl was threatening her son with, was never said.

"No, Mom." Whatever it was, certainly speeded up my nephew's response, because in spite of slight objections all three of my sister's kids were soon standing in the middle of the living-room floor, blushing a little at being almost naked in front of their uncle.

The oldest, Danny or Daniel, was almost six feet tall, an inch shy of my height, while weighing almost a hundred pounds less. Not that he was skinny, or I was particularly fat. It's just that he was a boy, and I was a man, Well, OK ... Danny was a young man, and I was getting close to middle-age. Dishwater-blonde hair, blue eyes, and an engaging grin greeted me as always. Danny LIKED his uncle, and I liked him. "My favorite nephew" I always called him ... and he called me, his favorite uncle. The fact that I had no other nephews and he had no other uncles, just made the joke that much more funny. Dressed only in shorts and shoes, he looked ready to shiver ... with embarrassment, not cold; as the house was quite warm.

Next in line (age, not position) was his "little sister" Tanya. I emphasize "little" because Tanya was anything but "little" for her age. At twelve years old, my niece had developed in a way that 20-year-old women would kill for, No, not overblown, but definitely all WOMAN, for all of her tender age. Her breasts never would become the overblown gazongas that some women got (taking after her mother in this respect). I doubt if they filled a 'B' cup completely. But breast of a woman they definitely were; jutting out nicely and filling the bra she wore in a fashion to make any wolf (like me) sit up and howl. Many times before I had joked about how Cheryl was going to have to get a club to beat off the boys who would come chasing after the little girl ... and now it was obvious that the joke wouldn't be funny much longer; as with a body like that, Tanya would be attracting more male attention than a Playboy Model. Long brown hair in a slight flip where it reached her shoulders, and matching brown eyes that you could drown in the laughter of, along with the cutest slightly pug nose, tiny hint of freckles, and a mouth that rarely frowned, almost always smiling and giggling, and you get the barest hint of the beautiful woman that my eldest niece had become.

When you saw her as I did that morning, in matching red bra and panties with nothing else to hide her charms ... Well, Playboy models would turn green with envy. (OK ... So I'm prejudiced. My niece is that beautiful to ME, if not to others ....) The amount of bare skin shown off by the nubile young girl, I'm ashamed to say had me drooling, and even half a hard-on ... even if she WAS my own niece. I can't help being human. Breasts, butt, tits, and ass, Tanya was all WOMAN. Even if that woman was only 12 years old.

Lastly, there was Mindy. While not yet the woman her older sister was, the clear skin, slight padding on her hips, and just the tiniest hint of bumps on her chest showed that when they younger girl developed in the next year or so, she was probably going to give her older sister quite a run for her money. Already the younger girl MOVED almost as sexy as Tanya, somehow looking like an invitation to sex, like a pedophile's wet-dream, instead of just looking erotically beautiful like her big sister. Mindy had the darkest hair of the three siblings ... Long, straight, dark, almost black hair; running down her back almost to the crack of her ass. (I looked closer, and by damn it went PAST her ass already!) I compliment the little girl on her hair all the time. I hope that had something to do with her letting it grow even longer. I suspect so, as Mindy clearly doted on me. How MUCH she doted, well ....

Green eyes, pug nose (even more than her big sister) and even more freckle set off the child's face. Not as laughing and giggly as her big sister, Mindy's serious face somehow made me feel even more comfortable with her; as if I knew she was sharing her true feelings and life with me, when she settled down to talk with her "favorite uncle". Somehow, of the three kids, Mindy was the one I felt closest too; though Danny was by far the one most like me otherwise.

Right now, being the one closest to naked of the three children (wearing only a white cotton pair of panties) the youngster somehow looked the sexiest ... even more so than her big sister, Tanya. I think it was attitude ... Mindy was trying to look sexy for ME (though WHY I hadn't found out yet) while her big sister was just naturally looking like any normal man's wet-dream, without even trying.

All this examination and rumination about the looks and personalities of my sister's kids took barely a second or two to accomplish, though telling about it takes much longer. I barely had time to grin back at Danny, lick my lips in unconscious appreciation of Tanya's charms, and shake my head with wry appreciation (and a big grin in response) to Mindy's smirk at my look at her big sister, followed by a "bump and grind" that I swear kids her age didn't know how to do when I was that young, when Cheryl came in after finishing up in the kitchen.

"Well?" she accused. "What are you too waiting for?"

As both older kids gave me an embarrassed grin, and started hesitatingly to take off what little clothing they had on, Cheryl turned to Mindy and added, "You too. You can help."

"It's about time the kids learned priorities around here," she added; coming over and joining me on the couch. The seeming-modest housecoat my sister was wearing slipped open and gave me a view of her body I'd never seen before.

I practically gaped; ignoring the three kids on the carpet. My big sister was NAKED underneath the housecoat. My mind was stunned at the mere thought, though Cheryl pulled it closed around her before I got more than a glimpse of long legs, furry bush, and breasts that poked out firmly. If I had any sense, the erect nipples and firmness of those breasts would have warned me of what was to come ... maybe. Like I said though, my mind was stunned.

"Ooooooh, That feels good."

The moan from the middle of the room attracted my attention to what was going on there, instead of the vision alongside me. What was going on in the center of the room riveted my attention there for the next several minutes.

Tanya, my eldest niece (The one with the tits and ass, remember?) was lying on her back in the middle of the floor, stark bonkers naked, while her big brother was between her legs ... ALSO stark naked, and with a swollen prick sticking out in front of him. It was quite obvious that the two kids were not only GOING to have sex, but were EXPECTED to have sex, and probably had done so many times before. To cap this off, their little sister Mindy was holding the older boy's penis, and rubbing it against her older sister's vagina!

It was the sensation of this, that had prompted Tanya to moan with appreciation at the sensations her little sister was producing with their brother's prick.

"Don't tease your sister too much, you two," prompted Cheryl; her voice breathing huskily in my ear. "She needs that thing IN her right now. You kids can play around later."

"Yes, Mom." I'm not sure if that response came from Danny, Mindy, or both; but the action was the same as the older boy moved forward; sinking his prick into the 12-year-old, while their little sister directed the member into her big sister's body until forced to remove her hand as the two older siblings' pubic bones met.

"Ooooh," the moan of appreciation was repeated.

Danny didn't say a word' but the look of almost painful ecstasy on his face made it clear that the older boy liked the feeling of his prick sinking into his sister's body almost if not more than she did. For sure, neither one was complaining.

Mindy just looked down in fascination at where her big brother's prick had vanished into her big sister's body ... as if wishing it was HER the older boy was fucking, instead of Tanya.

"Aren't they beautiful kids?" asked Cheryl breathily in my ear. Somehow in being distracted by the "action" going on in the middle of the floor, my pants had become unzipped, and a warm, willing hand was stroking my swollen penis while I watched. For the first time in many years, the willing hand was not my own, but my big sister's.

"Uh .... Uhuh," I could barely groan in agreement.

By this time Danny was sliding in and out of his sister; the very picture of two kids fucking, in a display of eroticism that put any porno flick to shame.

"C'mere, Honey ... Help me with your uncle," directed Cheryl; and two seconds later the older woman's hands were replaced by softer, younger, more inexperienced, but even more eager ones owned by her youngest daughter. I groaned; but somehow couldn't muster the gumption to even begin to object to being molested by my 10 year old niece.

"Careful, Dear ... We don't want him cumming yet," Cheryl admonished her daughter; placing a hand over the younger girl's, and slowing the frantic pumping before I blew thick wads of sticky cum all over the child's hands, face, and my crotch too.

I almost came anyway; as the stimulation of having my prick massaged along with the "action" in the middle of the floor was almost enough to take me over the edge. By now, Danny had come down on his little sister's body and was fucking the girl full "missionary style" with her legs wrapped firmly around his; pulling the boy into her body with each stroke he gave.

"Oh, God, I'm gonna ...," Danny groaned; while sinking to the hilt in his sister.

I looked over at MY big sister. "Hadn't you better DO something?" I asked. "If Danny cums inside her like that ...." I left the rest unsaid.

"... He might get her pregnant?" asked Cheryl; seeming unworried at the prospect.

I nodded. Somehow the idea of my nephew fathering a child on his own little sister didn't seem so obscene, while my 10 year old niece slowly jacked on my prick, and her mother pinched the base to keep me from spewing thick sticky cum all over her daughter's face.

(Mindy was leaning over me, her face not two inches from the tip of my prick, as if she was planning on giving me a blow-job, and her hair draped in sensuous trails all over my stomach and groin. Somehow I had ended up with my pants on the floor, my shirt on the couch, and only my shoes keeping me from being as naked as the little girl jacking me off. When exactly this happened, I never noticed.)

"Well, if he does, he does," replied Cheryl. I was almost dumbfounded by my big sister's nonchalance. "After all," she concluded, "isn't that the whole idea of having sex with her?"

"Oh, Oh! OOOOHHH!" groaned Danny from the floor; echoed by his sister's, "Ah ... ah ..... AaaiiieeEeeeEEE!" in response, as the two children rutted frantically. From the jerking of the boy's body into his little sister, it was obvious that his penis was doing the job it was designed for: ejaculating his sperm into a fertile female body. That the fertile body accepting the sperm was his own sister, seemed to bother neither sibling a whit; as both kids did their best to get Danny to squirt each thick drop of incestuous seed as far up in his sister's eagerly accepting young womb as two children could.

Finally the frantic mating and rutting of the two siblings slowed; and Danny collapsed on his little sister; his chest mashing the girl's bosom flat as they both moaned in exhaustion and appreciation of the pleasures each had received from the other. That the boy's potent sperm were even then rushing madly up inside his sister's uterus in search of her fallopian tubes and waiting egg to fertilize, bothered neither the two incestuously coupled children, nor their mother, nor sister, nor surprisingly, even me. I actually found myself HOPING that Tanya got pregnant from this episode (obviously not the first for the two siblings) and that I had just witnessed the beginning of life for my first grandniece or grandnephew (or delicious thought, possibly both)!

"Momma, can I ...," pleaded Mindy; distracting me from her two older siblings, now that they had completed.

"Ask your uncle, not me," responded Cheryl; her whole face one big grin.

"Can I, Uncle Dan? Please? Please?" she asked; looking up at me with that begging face that only children can do properly.

I looked at my sister for guidance.

Cheryl grinned back at me. "She wants to fuck you," she explained; as if it was the most normal thing in the world for a 10-year-old girl to plead with her own uncle for sex.

"Please, Uncle Dan? I'll make it feel REAL good for you, I promise!"

"Um ... I'm not sure," I responded weakly. Watching my sixteen year old nephew pork his twelve year old little sister was one thing ... but they, while both legally still children, were adults in body. I, on the other hand, was definitely an adult (both legally, and in body) while my cute (and yes sexy) little niece was definitely only a child (again, both legally and in body). "I'm a little big," I explained, to soften the blow.

"That's OK," she responded confidently. "Daddy and Danny fuck me all the time. In fact, Daddy says it feels even better to cum in me, than it does in Momma. Please, Uncle Dan? I'll make it feel REAL good, I promise!"

I looked over at Cheryl, who was looking back at me with a somewhat bemused expression at her little girl's candidness ... and maybe even a little embarrassment too. For the first time I got a really GOOD look at my big sister's body, as the housecoat wasn't really covering anything by now; simply pushed out of the way behind her. Firm bosoms (a hint of what her girls would have at her age) only a slight wrinkle and stretch-marks from one of the kids, and a body I wished I had seen more of and more often. I looked close to see if she REALLY wanted me to.

Cheryl shrugged and grinned.

"Ok," I responded; giving up my objections, and burying my conscience. Obviously I would NOT be forcing the kid into something she didn't want.

With a squeal of glee, the next thing I knew a ten year old little girl was climbing on my lap, fitting my swollen peter into her incredibly tight little hole, and sliding down on me. I had barely time to grasp Mindy by the waist in self-defense, before an incredibly tight ring surrounded the tip of my prick (while my big sister held it upright and ready for her daughter) and then slowly worked it's way down until it was surrounding the base of my prick, and my penis was buried to the hilt in the bare squeezing slit of my own niece!

The milking squeezing tightness of her tiny hole was too much ... after all the stimulation of watching her two siblings mate like minks on the floor in front of me, I felt myself start to spasm the moment three inches were inside her, and once the child's pubic bone met mine I was in full ejaculation. God, it felt so good to let that heavy load of baby-juice go ... right where it belonged too, in the belly of a willing woman. And for all her tender age, Mindy WAS a woman.

"Just think," whispered Cheryl, as I spasmed her daughter's tight little slit full of thick heavy cum, while the child's flat little belly rippled in orgasmic response to each thick white surge of incestuous seed into her loins, "Mindy's period was a little over a week ago. If you're both lucky, you might be getting that little girl pregnant with your baby, right now."

Oh God! My sister's words sank in like a depth-bomb. I couldn't help it: My prick swelled again; and I blew an even bigger wad in the child than I had before. Spasm after spasm shook me while Mindy's tight little slit milked and chewed and worked to extract each precious drop of sperm into her heaving young belly where it belonged. Jet after jet, squirt after squirt, until my balls ached with dry heaves, and Mindy and I collapsed against each other because we were both too exhausted from jamming ourselves together. Surprisingly, for all the cum I had deposited in the third-grader's belly, not a drop escaped; held in by the thick plug of her own uncle's fat prick. I knew that when we pulled apart though, that a river of semen was going to make a hell of a mess in my lap. I was too tired and satiated to care.

"Now don't hog your uncle," my sister admonished her youngest offspring. "After dinner, your big sister is going to want HER turn to feel uncle Dan pumping a baby in her tummy too. Just because you're first, and he's going to be sleeping with you tonight, doesn't mean you can keep him to yourself, you know."

"Yes, Momma." Mindy snuggled even closer; forcing my half-limp prick back up inside her to the hilt; obviously deciding to enjoy being mated to her uncle as long as she could.

"Thanks, Uncle Dan," the ten-year-old whispered hotly in my ear, while her tight little slit massaged my prick. "I can't WAIT to get you in bed tonight. Don't waste ALL of your cum in Tanya. My big sister might be older, have better tits, and (Mom says) be more likely to get a big belly when you cum in her; but *I* am the best lay in the house; and don't you forget it. Even Daddy says so. I want to feel you pumping a baby in my tummy at least two or three times tonight."

Oh God, sibling-rivalry is going to kill me.