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In Your Sister
by Frank McCoy (1998)

***

Brother and sister are caught making out by their 
single parent mom and are taught a lesson they won't 
soon forget. (mf-teen, reluc, inc, preg) 

***

"ALL the way up in your little sister," Momma 
insisted. Momma had caught the two of us "making out." 
We weren't really fucking or anything like that, just 
feeling each other up, and kissing, and stuff like 
that. Momma caught us. Boy was she mad! 

After yelling and screaming, calling Lori a slut, and 
me even more unmentionable names, Momma finally calmed 
down. Or at least, she seemed to. What she did next, I 
still find hard to believe. At first, I figured that 
Momma had cracked. You know, gone over the edge. 
Loony-bin stuff. Well, I guess Momma cracked all 
right. Cracked right out of her shell. Inside, Momma 
is a very kinky lady, and I guess she had been holding 
it back for years. 

Anyway, once she realized what we were doing, Momma 
decided (probably correctly) that no matter how much 
she screamed and hollered, we probably wouldn't stop 
sneaking around and playing with each other. So, she 
decided that if we were going to play around, we might 
as well do it right. In fact, that's what she told us. 

"Huh?" I said. Lori's mouth was gaping too. 

"I said, if you're going to fuck around with your 
little sister, you might as well REALLY fuck her, and 
do it right." I still couldn't believe what I was 
hearing. My staid, prim, old-fashioned mother, 
actually TELLING me to fuck my own sister? No way! 

Momma had just started, however. "You're not on the 
pill, are you?" she asked Lori. 

"Momma!" You could tell by the tone, that my little 
sister had never even thought of such a thing. I mean, 
you don't go on the pill, unless you PLAN on being 
fucked. Lori was still a virgin. 

Momma semi-apologized, "Well, you never know. Some 
kids get them from school, or the free-clinic. They 
aren't allowed to notify parents any more, unless the 
kids tell them to." 

Momma looked at Lori even closer. "How long ago was 
your last period?" she asked. 

Lori thought a bit, then responded, "I dunno, about 
two or three weeks ago. Somewhere in there." 

"Good," said Momma. "Now why don't you two get 
undressed, and do this properly." 

"Steve," she said, turning to me, "if you're going to 
fuck your little sister, you'll both be more 
comfortable on the bed." Momma WANTED me to fuck my 
sister?! I looked at Momma in astonishment. 

Momma's face clouded up again. "NOW!" she said, making 
us both jump. "I'd better see nothing but two naked 
bodies in your bedroom Lori," she said emphatically, 
"in two minutes, or you're both going to be sorry!" 

If there's one thing about Momma (Or Daddy, for that 
matter.) she doesn't threaten lightly. Lori and I were 
moving before Momma finished her threat, shedding 
clothes as we went. By the time Momma made her slower 
way into my little sister's bedroom, we were both 
naked as jaybirds, and sitting on the bed waiting. 

Momma STILL looked annoyed.

"Well, what are you two waiting for?" she asked. "I 
told you Steve, fuck your sister. What's the matter, 
do I have to put it in for you?" she asked 
sarcastically. 

"B-but Momma!" wailed Lori. "We don't have any 
condoms! That's why we were just feeling around." 

Momma looked as if she were going to blow her top. 
"Not in MY house, you don't," she exploded. "As I said 
before, if you're gong to fuck, you're going to do it 
right. Now get started, or get out!" Momma looked as 
if she meant it. 

Well, at 15, I sure wasn't ready to leave home, and if 
I wasn't, my little 10 year old sister wasn't either. 
We looked at each other and shrugged. Well, if that 
was what Momma wanted, that's what she would get. If 
my little sister had a baby, well Momma asked for it. 

Somehow I knew that Momma would be overjoyed, if Lori 
showed up with a big belly. 

Lori lay on her back; and I put my cock inside her. 
Yeah, just like that. No foreplay, no sucking cock, no 
twiddling her twat. Just up and stick it in. After 
all, that was what Momma wanted, wasn't it? Besides, 
we had gotten hot and slippery enough, before Momma 
caught us. 

That, and the thought of actually fucking my little 
sister, and getting her pregnant, with Momma's 
permission yet, was unbelievably exciting. 
(Permission? Hell, Momma was almost INSISTING that I 
knock the kid up.) 

As I said, I did it. I pushed my big cock up inside my 
little sister's tight little hole, and gave her a 
belly full of baby-juice. Lori only let out a little 
squeak, when I slid through her hymen, then she was 
grunting and moaning as though she had been fucking 
for years. 

As I mentioned before, I did it. The feel of the 
little girl's tight little slit squeezing and clamping 
on my already pre-cum leaking prick was too much. 
After all, I hadn't really been inside a girl before, 
let alone one as tight and horny as Lori. I made about 
two big strokes, in about 10 seconds, and I lost it.

I pushed my cock up inside my little sister, and gave 
her what she wanted: a bellyful of her own big 
brother's incestuous sperm. 

That's when Momma said those words at the beginning of 
this story. "ALL the way up in your little sister," 
Momma insisted. I grunted, and did my best. Pushing up 
as hard as I could, I did my best to plant as much of 
my baby-making seed as far up in the little girl's 
tight little belly as it would go. 

Momma seemed to be satisfied. Once she had seen me do 
my best to impregnate my 10 year old little sister, 
she calmed down a lot. Momma made it clear to both of 
us, that we could play around with each other all we 
wanted, we could even use birth-control, when she 
wasn't around, but not the pill. 

She just insisted that if we WERE going to play 
around, that at least once a month, we stopped 
"playing," and did it right. Yeah, just what you 
think. 

From then on, Momma practically ignored the two of us, 
and our almost constant sex-show. That is, unless we 
made it TOO obvious, or invited her in to watch. Once 
a month though, Momma insisted on watching the two of 
us fuck. She always made sure that Lori was in the 
middle of her period, and that we didn't use any 
protection at all during that one time.

After the first time, Momma always insisted that my 
little sister go to bed without washing up afterwards, 
so that her big brother's sperm would have a chance to 
soak in. Then, for a month, she would leave us alone. 
Don't get me wrong, Momma didn't INSIST that I 
impregnate my little sister. 

She just insisted that if the two of us were going to 
fool around, then at least once a month, we had to 
take our chances that I MIGHT make a baby in my little 
sister. There's no way that Lori and I were going to 
stop fucking, once we started. Also, as you might 
guess, and Momma probably planned; we figured that if 
we were taking a chance part of the time, what 
difference did it make the rest of the time. Except 
for a few days at the beginning, we didn't use any 
birth-control when Momma WASN'T watching either. 

After a while, it got to be quite a kick, thinking I 
was planting a baby in my cute little sister's flat 
little tummy. It took longer than you might think. 
Lori had just passed her 13th birthday, when she 
finally missed her first period. By the time she was 
14 though, we were already working on a little sister 
for our son to fuck. 

Well, as Momma said, "If you're going to do it, you 
might as well do it right."

END

~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
This story was written as an adult fantasy. The author
does not condone the described behavior in real life in
any way, shape or form. Anyone tempted to act out any
of the scenarios in this story should seriously 
consider seeking professional help.
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