Chapter 1

I watched closely as Bobby's thick prick vanished slowly into his little sister. Looking at the thick member slowly sinking into the nubile young girl's body, you would never think the older boy would be able to get all of that meat into the child, without him longcocking her and making her scream in pain. Judy however, had been fucking her big brother since she was three years old, and he was five; enjoying it all the while. Today was no different for that. For something else it was, however.

I know it's wrong to let my son fuck his own sister like this. Even more, I know just how dangerous it is to allow the boy to ejaculate his seed in his little sister's fertile young belly ... but I can't help it; being mesmerized by the sight of my handsome boy's prick first bulging, and then throbbing as he squirted gob after thick white gob of his potent seed into the child's womb. Ever since the first time the boy actually ejaculated in his little sister about four years ago, I knew this moment would come ... and I could no more stop it now, than I could back then. Watching the two kids progress from simple feeling-up to oral sex to actual vaginal intercourse to anal sex and other things even further out had been a constant thrill over the years. In the last few years, watching them go even further, as first Bobby then Judy reached puberty was more than just exciting, it was thrilling, exciting, electrifying, provocative, exhilarating, and just plain erotic as Hell. That my two kids were now grownups, (in the only way that really matters) doing real grownup things, was as stimulating as anything you could imagine.

Bobby's panting grew harsher, as his orgasm approached; while Judy locked her slim ankles around her lover's legs. There was no way that steaming load of thick white pregnancy-juice was going any place except into the little girl's sucking young womb where it belonged.

"Do it," I murmured. "Do it."

Bobby grinned up and me and smiled; holding his prick buried to the hilt in his little sister's belly, while he held off his approaching climax. They both knew full well how much I liked to watch them fuck.

"Do what, Mom?" He prompted.

"Yeah, Mom, what?" added Judy. Her grin matched that of the older boy, as her hips slowly rocked back and forth in an instinctive copulating motion; her slippery little slit slowly massaging the thick penis that was buried to the hilt in her wet, engorged, and wantonly swollen sex.

"Cum in her," I said. "Shoot your spunk in your little sister's womb. You want to cum as far up in your sister's tummy as you can." I shivered at the obscenity of what I was saying. I know it's wrong to let my son ejaculate his sperm in his little sister ... especially considering that the younger girl has been having periods for over four months now; and had finally finished her first regular flow a little over a week earlier.

Chapter 2

Somehow the danger of having my barely teenaged boy actually impregnate his eleven year old little sister with his incestuous sperm just increased the thrill of watching the two kids mating like this. The knowledge that neither child knew the full consequences of what they were doing, was almost mind-blowing. I had fantasies of Judy being six months gone; her now-flat cute little belly sticking out and heavily swollen with her own brother's baby inside her; neither child having the faintest idea of what had happened, or what was going on in her body ... the two kids still fucking merrily away, without either one knowing the end results of what they were doing or had done. I almost had a climax at the very thought.

Bobby and Judy however, weren't really listening to me. The two kids were too involved in THEIR respective climaxes to pay attention to their mother having a vicarious one next to them.

"Do it," Judy echoed my words. "Do it, Bobby. I want to FEEL it squirt inside me." Her sweet young face twisted up into a grimace that almost looked like pain, as her hips began working almost frantically to extract her brother's sperm. Judy's mind might not know the full consequences of her actions with her brother; but her body was certainly doing everything a little girl can do to get it to reproduce.

So was Bobby. With a groan he suddenly sank down on his little sister; frantically rutting into the child while his prick bulged and spat wad after thick white wad of sperm into Judy's milking vagina. Bulge after thick bulge rippled through my son's prick, as the boy bred his little sister like a bull breeding a cow. Thinking about how the child's tight little tunnel was squeezing the boy's penis at the same time as it stretched her inside and then throbbed and spat gob after thick sticky gob of gooey white cum inside the little girl's sucking young vagina; splattering incestuous seed against the child's uterus until Judy's cervix dipped into the obscene pool of her brother's cum and sucked it into her developing womb, was enough to make me shudder with repressed need for something similar inside myself. But this thick white injection of baby-juice, was reserved for my daughter's womb, so SHE could feel HER brother's baby squirming inside her cute little tummy, like I had once, not my needing womb ... as much as I wanted it for myself. I had had MY fun years earlier, when I had first Robert, and then two years later, Judith Ann. I sighed for the lost days of my mis-spent youth. Well, maybe NOT so mis-spent, thinking about the two wonderful results mating so joyfully here in front of me.

"Do it," I encouraged the boy thickly; my tongue swollen and swamped with saliva as I almost drooled on the two of them. "Squirt your spunk as far up in Judy's tummy as you can. I don't want you wasting any of it on the bed." I could barely choke out the words; as a climax of my own at sight of the erotic dance taking place in front of me took me over the edge. I could barely stand up to see the two kids work out their own climaxes; Bobby's seed filling his little sister's belly with thick heavy gouts of pearly white incestuous cum pumping in lusty jets from his straining, squirting penis against the smooth pink walls of my daughter's tightly stretched and squeezing little slit.

Chapter 3

For not the first time, I wondered if it could possibly feel as good to Bobby to have Judy's tight little sleeve wrapped around his swollen prick, as I knew it felt to the little girl to have him sliding, swelling, then spurting inside her, from my own similar experiences when I was their age.

"Unh, Uhn, Unh," he panted. Then, "Yes Mom," as his squirts subsided into just little drops of goo in Judy's belly. My imagining the sticky mess he had made inside the little girl, as his prick first spasmed, then squirted, and finally dripped the last few sticky white globs of incestuous sperm inside his own sister's tight little tunnel, almost made me cum again.

"Good," I said. "For the next week or so, I want you to make sure and spunk your little sister's belly as often as you can. A horny young boy like you should be able to fuck your little sister at least three times a day, and probably four or five. OK?"

Neither child even wondered why.

"OK," said Bobby happily; slowly pulling his white-streaked member out of his little sister's clutching young slit. Even soft, my daughter's tight little hole clung to the older boy's prick; following it out, almost looking like a second skin turning inside-out around the boy's penis, and stripping nearly every thick drop of her brother's potent seed inside her tummy where it belonged. I almost collapsed again in orgasm; thinking about millions of my son's vigorous sperm wriggling up inside the child's uterus and on into her womb; as each lusty little tadpole raced the others, vying desperately their in frantic search for the little girl's waiting and ripening eggs.

"And don't let me catch you wasting any of it outside your sister," I added; remembering the other day. Over the years, ever since they first started fucking, I had made sure both kids knew and experienced ALL aspects of sex ... even those I didn't care for personally. The kids had taken to sex like ducks to water; in the last few years, making their way three times through the Kama Sutra (which I bought the moment Bobby first ejaculated sperm inside his sister). "Your sister is going to need LOTS of spunk up in her tummy in the next few weeks, if she's going to be a BIG girl like her mother," I added. Exactly how big and how like a mother, I didn't tell them. I figured Judy would find out soon enough, when her cute little panties started getting tight. (Or maybe not even then, with a little bit of luck!)

Bobby just nodded happily; grinning from ear to ear. If his mother wanted him to spend all of his spunk inside his cute little sister's tight little sleeve, then he was quite willing to put it there. I thought seriously for a moment of getting out the Kama Sutra again ... and then decided that one of the books my sister had lent me years ago when I was trying desperately to get pregnant might be better.

"You too," I prompted Judy. "For the next two weeks, I want you to let me know if your big brother doesn't fuck you and squirt his spunk in your tummy at least once in the morning before school, and once at night before you go to bed, besides whatever fucks you kids do during the day, OK?"

Chapter 4

"Yes, Mom." Judy seemed unconcerned and not even surprised at my insistence on having Bobby ejaculate his seed in her vagina, instead of squirting his cum in her mouth and ass like he often did. "Can we do it again now? Please, Mom?"

I was about to say it was getting late, close to school time, and that her brother probably wouldn't be able to do it again so soon, when Bobby put the lie to that last, by sliding his cum-dripping re-erect penis back inside the little girl and starting to fuck the 11-year-old all over again! I actually SAW a thick white drop of cum oozing from the end of the swollen prick, before it vanished again into the child's peach-like split, that was soon sucking once again at her brother's thick penis, in hopes of getting the older boy to squirt her tiny little womb full of life-giving seed yet one more time. Ah, the resilience of youth!

I settled back down to watch. The two kids might be a little late getting to school this morning, but there ARE higher priorities, you know. If necessary, I would write them a note, or take them to school myself. I knew it would take a little longer for the boy to ejaculate his cum inside his sister the second time; so I made myself comfortable while I looked. I spent the time waiting; daydreaming about Judy having two or even three kids by her big brother, and her tummy being swollen by a fourth one, with neither child ever having the faintest idea of how it happened, or the normal end-result of having a teenaged boy keeping his nubile young sister's cute little tummy full of his incestuous sperm. I wanted MY kids to have as much fun as I did, (or hopefully even more than I had) back when I was their age.

My orgasm at that sexy thought ripped through me as I joined my two children in their second and third (Bobby's second, Judy's third) orgasm of the morning. My stomach rippled, and my vagina clutched in an unsteady rhythm at my probing fingers; almost in sync with my daughter's tight little sleeve clamping and squeezing desperately in frantic attempts to milk each precious drop of her brother's sperm from the swelling, throbbing, and wildly spurting member that was filling her tummy so nicely ... and like *my* tummy hadn't been filled in way too long, it seems. Millions of tiny sperm rippled through the thick tube on the bottom of Bobby's prick, before being spat vigorously into the welcoming young womb of his little sister, where hopefully at least one would reach the child's waiting egg before the day was over.

God I love my kids. Judy was going to really enjoy this, when she finally figured out what had happened, and what I had done for the two of them.

I sure had, when my parents did it for me and Dan.