I guess it's pure luck that I got home early that day. Still, luck and opportunity come to those who take advantage of them when the occasion arrives.

I had barely gotten in the door, when I heard voices coming from my daughter's bedroom. I guess the noise the two were making in there had kept them from hearing the car pull in, and me opening the door to put down groceries.

"Grandpa," came the voice of my daughter; then louder, "Grandpa!"

Dropping my purse, I hurried down the hall; figuring a male and female voice in my daughter's bedroom at this time of day could only mean one thing . . . sex. Here I had almost begun to give up hope; figuring the girl was frigid or (horrible thought) a lesbian or something. Still . . . her grandfather? I had really expected the 13-year-old to start with boys her own age; or if she was turned-on by older men, then someone her father's age . . . like I had, when I was considerably younger than she was. Still, you take what's available; and not having any current boyfriends or brothers or sisters in the house at the moment, I guess the child had turned to who was available. I hurried down the hall for a closer look, to be sure.

I was right. My father-in-law was in the little girl's room, completely naked (as was Sherrie), while the two rutted in the classical missionary bump and grind that usually brings such satisfactory results for both parties involved.

"Grandpa!" objected Sherrie again.

"Uh?" groaned the older man; sliding his prick in and out in short jerks that I figured meant it wouldn't be long before he was decorating the inside of my little girl's womb with baby-making seed.

"Grandpa, don't cum in me! I could have a baby!" For all her oral objections, my daughter had her legs wrapped around her grandfather's; and was humping back at him as hard as he was humping into her. "I'm probably ovulating RIGHT NOW," she emphasized, "and if you cum in me I'll get pregnant for sure. Please, Grandpa?"

"Oh God . . . I wanna' cum," groaned the older man. "Gotta' pull out . . . don't want to get you pregnant." I could tell that the need to splatter his seed all over the inside of my little girl's vagina was fighting with the man's desire to protect the child from an unwanted pregnancy. Time for me to step in, before his body and the feeling of my daughter's tight little slit milking on his prick made him make a decision he'd later regret.

"Don't you DARE!" I snapped; making both parties on the bed jerk their heads in my direction, in surprise. I knew I was taking the risk that the shock of discovery would cause the older man to lose control and spasm my daughter's belly full of incestuous seed right then; but figured the surprise would far more likely cause him to lose most of his erection, and stop the urgency to blow sticky white cum all over the inside of his 13-year-old granddaughter's tight little slit.

Luckily I was right; or everything would have been all over right then. As it was, the two incestuous lovers stopped fucking, and turned to look at me; the very picture of two people having sex; with the fat cylinder of my father-in-law's prick stretching the little girl's cunny, and vanishing inside. Both parties were flushed and sweaty with sex; and I knew that if I hadn't interrupted, the act would have been over in mere seconds . . . minutes at most.

"Here, let me show you something my father showed me," I said, to the astonished faces of the two lovers. If anything, my daughter and father-in-law had never expected my reaction at catching them having sex together to be instructing them how to continue! I figured the two seemed to expect me to yell, scream, rant and rave about her having full unprotected sex with her own grandfather. Even if I finally gave them grudging permission to continue, it would only be after finding out it had been going on for so long, that stopping them was moot. Only my mind doesn't work that way . . . especially after what my parents taught ME, at a far younger age than Sherrie.

"You want to keep on fucking, but you don't want to cum in her because she might get pregnant, right?" I asked.

Bob nodded.

"And you want to keep on fucking too . . . only you're afraid that if your grandfather cums inside you, you'll have a baby, right?" I asked my daughter.

"Uhuh." Sherrie was barely more articulate than her grandfather.

"Well, I was your age too once. Let me show you something my father taught me, when I was afraid of the same thing . . . OK?"

"Yes, Momma." My father-in-law didn't say a word; simply staring at me.

"Now you've probably lost most of your erection for the moment," I said; reaching down between their bodies, and wrapping my hand around the base of the man's prick that wasn't inside the girl, to confirm my assessment.

Again, Bob only nodded; waiting to see what I was up to. Sherrie was staring with equal surprise at me, and where my fingers touched the thick cylinder that was throbbing inside her body.

"So slide in and out again, until you think you're getting close, OK?" I instructed/asked.

Bob looked at me like I was crazy for a second; then shrugged and followed my instructions; sliding out about a half-inch, then sliding in until my fingers were almost mashed against Sherrie's cunny lips. Within five seconds, the two partners were fucking almost as hard as they had been when I interrupted them; the only difference being that I had two fingers wrapped around the base of my father-in-law's penis, almost as if I was jacking him off in my little girl. My intentions were far different from that though; paying close attention to the swelling and stiffening of his prick, and the bulging of the bottom as he approached the climax he had been denied when I interrupted them earlier.

"Oh God, I'm gonna . . .," Bob's comment came faster than I expected it to. I guess the tight wet heat of a barely teenaged girl squeezing on the most sensitive part of his prick was too much to resist. With my finger, I felt a bulge start to ripple through the tube on the bottom of his prick; and knew he was right.

Pinching the tube hard to stop it from spitting thick white baby-juice in my daughter's defenseless belly, I said, "Stop!" loudly.

"Oh God, I'm gonna . . .," repeated Bob. I could tell the man was hard-put to follow my instructions; but he obediently stopped sliding in and out. The pressure of the bulge on the bottom of his prick increased for a second, then subsided, as I didn't let it ripple through and into my daughter.

"Now push up HARD inside her, and HOLD STILL that way, until the urgency passes," I instructed him. "You too," I warned Sherrie. "If you move too much, your grandfather will lose control, and it'll be all over, OK?"

"Yes Momma. Obediently Sherrie held still, while Bob pushed his prick into her until I had to remove my fingers from around the base of his prick. By then, the pressure in the tube on the bottom had relaxed; so I let go.

I watched the two lovers straining against each other, until Bob suddenly gave a kind of shudder and relaxed.

"See?" I said. "You get a little release this way, without cumming in her, and now you can continue . . . Go on. It'll be several minutes now before you feel the need to cum again; and I want you to do then, just what you did now . . . OK? When you're about to cum, just press up inside her as hard as you can, and DON'T MOVE until the sensation dies down . . . OK?"

Wordlessly, the two started their copulating motions again, at my instructions. Sherrie stared fascinated down her body at where her grandfather's penis was sliding in and out of her. "But what if he . . . I mean, when he . . . I mean, he can't keep this up all night," she said, about the third time her grandfather stopped stroking in and out, and she held him until he shuddered and was ready to continue.

"No," I agreed. "Pretty soon it's going to be too much even for that; and your grandfather's going to cum." I could tell that the girl's tight little sleeve milking on the man's prick WOULD get the best of him soon, even with my father's technique helping him to hold off from splattering the inside of Sherrie's vagina with thick white gobs of incestuous cum. "When you get to the point you just can't hold back any more, even when you're pushing up inside her like this," I told him, "you'll have to pull out, as soon as you feel yourself starting to cum."

"OOoooOooh," shuddered the man; as I could tell he was almost at that point already. Still, after holding himself in Sherrie for about 5 seconds, he managed to start stroking in and out again. I doubted he would be able to survive another time of feeling Sherrie's tight little tube milking and squeezing on the head of his prick, even if he held still.

"Only don't just yank it out," I warned. "Once you feel yourself start to cum, pull it out slowly; so the sensation doesn't make you squirt more than you have to . . . just make sure you ARE really cumming, before you do; because I don't want Sherrie to miss out on anything she doesn't have to, OK?"

Sherrie's "But Mommmm!" objection was overridden by her grandfather's expletive, "Oh shit!" as he suddenly jabbed himself as far up in the little girl as he could go. I cold tell that THIS time just holding still wasn't enough, as I reached down to the join, and felt one, then two, and finally three bulges ripple through the man's prick, before he obeyed my directions and pulled out once he felt himself cumming inside her.

"It's OK," I reassured her, as the obscene member slowly inched out of her tight little slit. "A little bit inside you probably won't hurt, as long as your grandfather gets it outside before he really cums." As I said this, I felt a fourth thick bulge ripple through the tube; and as the purple head exited I felt a fifth bulge, just before the hole in the tip expanded and a thick white jet splattered directly into and around the hole closing slowly behind the man's departing member.

"See," I said; reassuring my daughter, "that's the stuff that makes babies." While I said this, I carefully milked the last thick drop of ooze onto the child's belly, so she could see it. I had to work fairly hard to strip out more than a drop or two; but what was there DID form a small puddle in the child's navel. "Aren't you glad that didn't get inside you?" I asked.

Sherrie shivered, as she looked at the thick white drop of baby-making seed pooling on her tummy, and the matching drop still oozing from her grandfather's prick.

"Now that he's finished cumming," I said, "you can finish up. It always feels better to the man to feel his penis go soft inside a girl, once he's cum. Dad and I used to do this all the time," I finished up; taking Bob's still fairly erect member and pushing the dribbling head back into my daughter's slit, where it pushed the earlier splatter inside.

"But Mom! He's . . . I mean, his . . . oh shit."

"It's OK," I soothed her. "The tiny bit of cum on his prick won't make much difference now . . . seeing that he's already cum on your stomach." I looked pointedly at the congealing glob making an obscene puddle in my daughter's navel.

"You're sure?" she asked, somewhat worriedly, as her grandfather slid his prick back up inside her with a sigh of satisfaction. For some reason it showed signs of renewed life, as the old man started sliding in and out again.

"Uhuh, You and your grandfather can do this (as long as you do it THIS way) as often as you like, without either of you having to worry about him getting you pregnant," I replied. "Dad and I did this for over three years, when I was young, and I never had to worry. After a while Dad got so good at it that he could screw me for hours without pulling out; just getting his fun from the times he almost came inside me."

"Eventually my father got so good that he didn't have to pull out to cum at all; and after a while when he pulled out he would be completely limp, with only a drop or two of cum to squirt; and sometimes not even that. Dad got all the release he needed, just by stopping and holding his prick up inside me whenever he was about to cum."

By this time my father-in-law was stroking in and out again; just like he had done earlier. Then he paused for a second, holding himself deep inside Sherrie, while another wave of release shook him, before going back to stroking in and out again.

"Now you make sure you push up inside Sherrie as hard as you can, if you feel like you're going to cum again," I admonished him. "They say that the second time a man cums is more likely to get a girl pregnant than the first one; and we don't want to take any chances with Sherrie, now do we?"

"You say you and your father did this for over three years, and you never got pregnant?" Bob asked; shuddering again with release, on top of my daughter; while Sherrie held him in her arms, almost comforting her grandfather in his shakes; while her legs wrapped around his and held him tight inside her. This time my father-in-law just lay panting on top of the girl, instead of going back to sliding in and out like he had before. I figured Bob had finally lost his erection, just like Dad used to in the old days, and was just enjoying the feel of his limp prick being massaged by the tight little tunnel of a barely teenaged girl. Once again I wondered if it felt as good to a guy to be inside a girl, and to squirt his sperm inside her, as it felt to me when I came. Well, Dad had sure seemed to enjoy fucking me all those years . . . (Was it really almost 10?) . . . almost as much as I had.

"Well, I was only eight years old, when we started," I said; remembering those days fondly. "So three years isn't all that long. And as for the other thing; I never said THAT." I smiled to myself, as I remembered my little sister Cindy and brother Mike. "I just said Dad and I did it that way for over three years after we started; and that's the way my parents made sure I never had to worry about pregnancy."

I watched as my father-in-law's prick finally slithered out of the girl. As I expected, only a small bubble of white oozed from the tip of his cock; just like it had been with me and my father. "See," I said to Sherrie; grabbing the man's limp member and squeezing the last sticky drop out to join the tiny puddle congealing in her navel, "that's your grandfather's sperm . . . the stuff that makes babies. Aren't you glad it didn't get inside you, so you don't have to worry about getting pregnant?"

Sherrie just nodded; while her grandfather just groaned.

"Good," I said with satisfaction. "From now on, I expect you to do it just like that; so none of us will have to worry about whether or not you get pregnant."

And that's the way things are going right now.

It's been over three years now, with Sherrie having full unprotected vaginal intercourse with her grandfather almost every day; and not once has any one of us had to worry about her getting pregnant.

I AM getting a little worried about her little sister though. Candy just turned eight (the same age I was when Dad and I started) and with two babies in the house, the child is likely to start worrying about having one of her own . . . if I don't do something, like have my husband show the little girl her grandfathers' techniques, before it's too late. I certainly don't want Candy worrying about getting pregnant like her big sister, at her age. I'd better have Dan show her Dad's technique tomorrow.

. . . .

Well . . . so much for "best laid plans." Yesterday I was watching my husband Dan slide his thick prick up inside our little girl, when he told her, "We've got to be careful, so I don't cum in you, so you won't have to worry about getting pregnant," just like I taught him to. I could tell my husband was almost ready to cum, with thick white gouts of incestuous sperm squirting in gooey jets against the child's cervix, the second he managed to get his entire member inside our little girl's tight little slit.

Only Candy blew the whole thing away. "That's OK, Daddy," she told him. "I'm not worried. You can get me pregnant as often as you want to, just like Grandpa does Sherrie . . . I don't mind."

"You don't?" gasped both Dan and I together in astonishment.

"No, of course not. You both know how much I like Mike and Jenny . . . it would be really neat to have a baby with my own father."

That was it for Dan. Hearing his own 8 year old little girl telling him that she didn't mind if he got her pregnant, while her tight little slit milked and squeezed on his engorged prick would be too much for any man, even one as concerned about his kids and how they felt as Dan. Even the thought that he wouldn't be able to give the little girl the fucking she deserved, couldn't keep him from blowing thick white gobs of sperm inside Candy's vagina where it was being massaged so erotically.

Well . . . at least we don't have to worry about Candy getting pregnant any more than we worry about her big sister . . . even during the times Dan isn't using Dad's technique.