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From E-Mail@address.com Tue Apr 02 09:25:31 1996
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From: E-Mail@address.com (Family Ties)
Newsgroups: alt.sex.incest
Subject: Sleeping with Big Sister
Date: Tue, 02 Apr 1996 07:25:31 GMT
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                      Sleeping With Big Sister
                         
     You wouldn't believe how sexy my big sister is.
     What's that you say?  "You wouldn't believe someone would be
so perverted as to fuck his own big sister?"
     Well, what would YOU do, if your sexy big sister came
into your room one night, and climbed into bed with you, stark
naked?
     Sure you would.  SUUURE you would.  And you would send back
the winning million-dollar lottery-ticket too, saying you didn't
deserve it.
     Actually, the first time it happened, it was completely
innocent.  Honest.  Well, for Elizabeth it was anyway.  My big
sister had just gotten cold, as the temperature outside dipped
down to almost zero.
     We live in this old farmhouse about ten miles outside of
Baltimore, Maryland.  Normally, it doesnt really cold here, 
but this year was an exception.  It had gotten to zero a couple of
times that year.  
     Anyway, Elizabeth has the room next to mine, and about 15
feet further from the thermostat, and further from the center of
the house.  Also, the duct-work into her room doesn't get as much
warm air from the furnace.
     Usually, Elizabeth doesn't mind; she just has one more
blanket than I do.  However, this night was not only cold, but
the wind was coming from the north for a change, and my father had
just installed the new thermostat to save energy, by
automatically turning the heat down at night.  It must have been
freezing in my big sister's bedroom.
     So, the big girl got up, came down the hall, and slipped
into bed with me.  All very innocent.
     "Huh?" you say.  "Innocent?"  "Climbing into bed naked, with
your own big brother?"  I see I'll have to explain a big more.
     Up to about a few years ago, when Elizabeth got cold, she used to
climb into bed with Mom and Dad.  She started doing this when she
was about three years old.  However a few years, Mom had put a stop
to it.  I think it was because at 13 years old, Elizabeth's body
was starting to have an effect on Dad, and Mom didn't want there
to be any "accidents" in the middle of the night.  Besides, Mom
liked her privacy, and Elizabeth was getting old enough that she
might notice certain "things".  Mom didn't worry because the past
few winters had been mild, never getting nuch below freezing.  But
this year had been different.  Everyday it was below freezing and the
evenings the temperature was in the teens or close to 0.
 
    Well, Dad's loss, was my gain.  Not being allowed to sleep
with Mom and Dad any more, Elizabeth figured that her little brother
wouldn't mind if she slipped into bed with him.

     She didn't ask me, she just did it.  Well, she never asked
Mom or Dad either, so that's really no surprise.
     What WAS a surprise, was waking up at about 2 AM, as my
big sister's body snuggled up to me for warmth.  She had just
walked down the hall, and slipped into bed with me, stark naked.
And I was just as naked.
     Huh?  Oh.  I never wear anything to bed at night.  Never
did.  I don't think my parents do either, as Elizabeth never
seemed surprised to find me not wearing any clothes, when she got
into bed with me.  Come to think of it, I don't remember even
seeing a pair of "pajamas" until I was almost 12, and George and
I went on that camping-trip with his dad, where he snickered at
me for going naked in the sleeping bag.
     I was just as amused at him actually wearing special
"clothes" to bed.  Heck, you might as well wear clothes to go
swimming!
     Even around the house, it's not all that unusual for one of
us to not bother getting dressed on a weekend morning, unless we
had someplace to go.  Mom usually dressed, because she didn't
want to get burned, when she made breakfast.
     Still, I can remember more than one morning eating cold
cereal, when all four of us sat around the table, with not more
than two pairs of socks, and a pair of slippers between us.  (The
tile floor is COLD.)
     So it wasn't the fact that Elizabeth was naked, when she
climbed into bed with me, that was such a shock.  It was the fact
that she was there at all, AND the fact that her body was cold!
     When my big sister snuggled her cute big 16-year-old
butt up against me, far from being aroused, I almost let out a
yell of surprise and shock!  Thank goodness I didn't.
     "What are you DOING here?" I asked my big sister.
     "I was cold," she complained; snuggling her almost-freezing
butt back against me for emphasis.  "You don't mind, do you?"
     I thought about it, and decided I didn't.  What the heck, I
felt sorry for my big sister, and besides:  I was cold too.
Elizabeth would make a nice big bed-warmer, once her ass warmed
up.
     Yeah, I can see your smirks right now.  Thinking about how
"hot" that bed would get.  Well, I wasn't thinking about sex
right then.  That didn't come until later.
     As I said, at FIRST, it was all very innocent.  Even on my
part.  After all I was only 12.  
     NO, I did NOT climb on top of my innocent big sister, and
fuck the hell out of her, just because she climbed in bed with me
naked.  Elizabeth just wanted to get warm, and at first, that's
all I wanted too.
     In fact, it wasn't until about two hours later, that I had
any sexual thoughts at all, about my big sister.  It must have
been about 4 in the morning, and we had both been sleeping
comfortably for quite a while, when I woke up with a piss-hard-
on, and needed to hit the bathroom.

     Only Elizabeth wouldn't let me.  I was lying with one arm
wrapped around my big sister's body; instinctively cupping her
big nubbin of a breast, and she had wrapped HER arm over mine,
and wouldn't let go.  I suppose I SHOULD have pulled away, but I
was still too sleepy to make a struggle.  I decided to wait to
pee.  Possibly even go back to sleep.
     Only it was about then, I became aware of my sexy big
sister's cute big butt rubbing against my piss-hard prick.  It
wasn't intentional, but it sure was sexy!  Suddenly pissing was
impossible anyway, as my piss-hard-on became the real thing.
     I tried pulling away, but Elizabeth just hung on tighter to
my arm, pressing it against her big chest, as she snuggled
back against me.  Once she gets to sleeping soundly, Elizabeth is
almost impossible to wake up.  I know, I tried.
     I tried pulling away from my big sister, but since she
had a death-grip on my arm, that just forced my groin even harder
into her sexy big butt.  After a couple of pulls, I stopped
trying anyway.  I had other things on my mind.  I COULD have
pulled away, if I wanted to, but it would surely have woken
Elizabeth up, and shortly that was the last thing I wanted.
     "Elizabeth?" I said, to be sure she was really sleeping.
     Elizabeth didn't respond, even when I repeated it louder.
     By now, my mind had become filled with the sexy
possibilities of sleeping with my big sister, when she was
unable to wake up.  Uhuh.  I'm sure you have had such ideas
yourself, about taking liberties with an unconscious girl, even
if you DON'T have a cute big sister sneaking into bed with
you.  Well, so had I, even before Elizabeth did.
     Only I never expected to realize those fantasies with my own
sister.  Once it became obvious that I wasn't going to wake
Elizabeth up, without raising a real ruckus anyway, the
possibilities were staggering.  Well, hard-on raising, anyway.
     Only I already HAD a hard-on, and Elizabeth didn't even seem
to be aware that her cute big rear was rubbing against a
throbbing erection, that was simply ACHING to slip up inside her
tight big cunny, and squirt her full of her little brother's cum.
     I didn't do it, of course.  I was too scared of what would
happen, if she woke up, while I was halfway inside her.  Could
you imagine the yelling, screaming and accusations?  Well, I did.
So I didn't try to fuck Elizabeth. . . At least, not then.
     I DID start sliding my prick back and forth, up against my
big sister's cute big butt; between her legs, and even up
against her pubic-mound.  Back and forth, until my prick was
drooling pre-cum; lubricating the sensuous slide between the
big girl's legs even more.  When the head of my cock got real
slippery, the top even spread my big sister's cunny-lips,
until I could feel her pubes wrapped halfway around it, and knew
the sweetest big hole in the world was sliding along the top
of my aching penis.
     That was it.  Before I was even aware that I was about to
cum, I was doing it; squirting great sticky gobs all over my
big sister's ass, between her slim big legs, and even all
over her pubes, and in between them.  It was like some silly
comedy, where I couldn't get the damned thing to stop squirting.

     By the time I stopped squirting, my big sister was a
mess.  So was I, with white greasy cum all over my hand, where I
had been desperately trying to keep from getting any on the bed.
Mostly I had succeeded, but at the expense of squirting more of
it all over Elizabeth.  I knew I had to clean up the mess, before
Elizabeth woke up, and wondered what was happening.  I knew I
could NEVER satisfactorily explain THIS.
     Elizabeth STILL didn't want to let me go, but I finally
managed to work my hand out from under hers, and make a bolt for
the bathroom.  I didn't DARE stop to pee, even though my prick
was now threatening to make an even BIGGER mess, if I ignored it
much more.  I grit my teeth, and dashed back into the bedroom,
with a whole roll of toilet-paper.
     First, I grabbed a wad, and stopped the more obvious drips
from reaching the bed.  Then I wiped my hand, and tried to clean
Elizabeth up, without waking her.  Elizabeth slept like a log.
     Only when I had finished up with the more obvious mess, did
I worry about what my big sister had between her legs.  What a
sticky gooey mess!  Ready to bolt and play "sleep" at an instant,
I carefully lifted my big sister's leg, and wiped up the
streaks of cum between them until I came to the most delicate job
of all.  Elizabeth's crotch was slippery, where I must have
squirted three or four healthy gobs of cum all over her pubic-
mound.  Carefully I wiped up there too.  Elizabeth didn't wake up,
or even move much; except when I wiped right between her big
mounds that made up the outer lips of her bare big cunny.
     Elizabeth moaned, and I thought she might wake up, but she
only pressed her big pubic mound more firmly against my
probing hand, while I froze in fright.
     When I realized she wasn't going to wake up after all, and
even seemed to like the feel of my hand between her legs, I
couldn't resist letting my big finger slip between the lips of
her crack.  It was warm and incredibly slippery in there, as some
of my cum must have accidentally gotten inside.  I didn't dare
wipe her there with the rough tissue, so I tried to kind of
"sweep" the extra goo out with my finger.
     I didn't really succeed, but something else happened
instead.  Elizabeth seemed to like the feel, and she pushed back
at my probing finger; until it slipped halfway up inside her hot
big hole.  Oh shit!
     As I said before, you wouldn't believe how tight my big
sister is.  Or how hot and wet she is inside.  I almost fainted
from the feeling of my big sister's vagina sucking on my
finger like a calf sucking on it's mother.  The though of how it
would feel sucking on my prick, was almost enough to make me
repeat my earlier embarrassing episode.  I couldn't resist
sliding my sperm-slippery finger even further up inside my big
sister to see what would happen.
     "Mmmm," moaned Elizabeth, making my hair stand on end.
Surprisingly, having her little brother feeling her up, didn't wake
her.  In fact, she seemed to slip into an even deeper sleep,
hugging the pillow, instead of my arm this time.

     I don't know how long I might have remained there sliding my
finger in and out of my big sister's hot wet hole, but I was
forced to quit fairly rapidly.  The pressure in my bladder told
me I had two choices:  Either make a mad dash for the bathroom,
or make a hell of a mess on the bed.  I pulled my finger out of
Elizabeth, (THIS almost DID wake her up!) and just made it to the
toilet, before losing control.  I actually made a slight mess on
the seat, but that was easily cleaned up.
     After I had finished, I returned to bed, and went back to
sleep.  Yes, sleep.  With the pressure off both my balls and
bladder, the very thought of the risks I had been taking was
enough to give me the shivers.  If I had been caught. . .
<shudder>  I moved as far away from Elizabeth as I could, and went
back to sleep.
     The sensual feel of my big sister's skin rubbing against
my leg was a wonderful way to wake up in the morning.  Her lithe
young body next to me made me want to hold and cuddle her all day
long.  It was only when I remembered the narrow chance I had
taken the previous night, that my hair stood on end, and I
hurriedly moved away from my sister.
     Elizabeth didn't even notice.  Cheerfully she got up, and
walked back to her bedroom to get dressed, now that the
temperature was back up.  She didn't even seem to notice or care
that I was staring at her naked body with interest, until she
left the room.
     Well, that should have been that.  Only what had happened
that night haunted me for the next three days.  Visions of my
big sister's naked body lying next to me covered with my sperm
filled my thoughts; while I imagined her sexy big butt against
my stomach again, and dreamed of my prick sliding up inside her
tight big hole, just like my finger had.
     I don't know WHY Elizabeth slipped into my bed that night,
three days after the first episode.  It wasn't nearly as cold as
before, and the wind was from the west, like it usually is.
Still, I didn't object.
     This time, Elizabeth just slipped into my room right at
bedtime, instead of the middle of the night.  "You don't mind if
I sleep with you tonight, do you?" she asked; but didn't wait for
an answer before slipping under the covers with me. For the
second time in a week, I found myself in bed with a cute,
squirming, sexy, and VERY naked big girl.
     Only THIS time, I was fully aware of the possibilities.  My
prick exploded into an erection, like a poker sticking out in
front of me.  I KNEW Elizabeth could feel it, as it was poking her
in her soft big tummy.  Surprisingly, she didn't seem to mind.
She just moved over, turned her back to me, and snuggled back to
me again; ignoring the fact that my prick was sliding halfway
between her legs.  I ran my hand over her flat big tummy, and
up over her young breasts, and Elizabeth just giggled.
Only when I started rubbing her pubic mound, did my sister reach
down, grab my hand, and firmly place it back on her sweet big
tit where it belonged.  Two minutes later, Elizabeth was asleep.

     There's no way, that I could get to sleep.  The sensual feel
of my big sister's skin against mine, the smell of her sexy
long hair in my nose, the feel of my prick rubbing against her
slim big leg the. . . well you get the idea.  I'll be able to
ignore my big sister when I'm dead.
     Part of me was FAR from dead at that moment; and it took
over most of my thinking.  Yeah, my prick was as hard as a rock,
and the sexy dreams I had been having all week about my big
sister didn't help matters either.  I waited, almost holding my
breath, until I was sure Elizabeth was asleep.  Then I waited some
more; listening to her quiet breathing for over half an hour, to
be sure she wasn't faking.
     "Elizabeth," I said, then louder, "Elizabeth?"
     There was no response, except the quiet breathing of my
big sister, and the slow rise and fall of her chest against my
hand.  This time, when I ran my hand down her tummy, and then on
until it rubbed her pubis, she didn't object.  Elizabeth was
really asleep.
     By now, my prick had been leaking slippery pre-cum for
almost a half-an-hour.  So, it was with no difficulty at all,
that I slipped the head of it between my sister's legs.  I wanted
to repeat the thing I had done the previous night.  Only THIS
time I had a roll of tissue-paper by the bed, and a towel handy
too.  I wasn't going to be caught unprepared this time.
     So, I started doing it again; sliding my prick up against my
big sister's butt;  between her legs, and even up against her
tight big hole.  Two or three times, I felt the tiny big
hole against the top of my prick, until I couldn't resist and
slid down in bed, until I could angle my prick up so the tip
poked into the furrow that guarded my big sister's vagina.
     I could actually feel my sister's tiny big vagina in a
circle around the head of my prick.  There was no way that I
figured I could actually get my penis inside her, but just the
thought was enough.  I came again.
     Only THIS time, I didn't get it all over the bed.  I got it
all over the inside of my big sister's vagina, instead.  Uhuh.
I had the tip of my prick poking into Elizabeth's tight big
hole, when it exploded; and I let every drop squirt right up
inside her.  I hadn't really PLANNED on doing this, but I did it
anyway.  (Actually, I had planned to use the towel, but once I
started squirting in Elizabeth it was too late.)
     Knowing my sperm was going into my own sister's body, was
incredibly sexy.  It was also a relief, to know I wasn't getting
it all over her body and the sheets, like last time.  I didn't
dare pull away, until I had spasmed the big girl full of every
drop of incestuous sperm I had in me, and my prick was finally
wilting like six-week-old celery.
     Since I had squirted it inside her, I couldn't wipe my cum
out like I wiped it up last time; so I stuck a wad of tissue into
my big sister's crack, and drifted off to sleep.
     About an hour later, I woke up sweating.  What if Elizabeth
woke up, and found a wad of tissue holding my sperm from leaking
out of her hole?  There's no way she wouldn't be able to figure
out what had happened.  I hurriedly reached down and managed to
work the wad of tissue out, without waking my big sister.

     Only now I couldn't get back to sleep.  My big sister's
sexy big body next to mine, and the knowledge of how close her
tight big slit was to the head of my prick wouldn't let me.
Finally, I knew I had to try again to blow another load of cum
into my big sister, or I wouldn't get ANY sleep at all.
     That's all I intended to do. . . Slide my prick in and out,
just like before, and jack off into my big sister.  I didn't
really plan on fucking her. . . Honest.
     Only when I was rubbing up against Elizabeth's vagina this
time, her hole was so slippery with my sperm inside her, and the
head of my prick was so slippery with pre-cum that when I tried
to seal the head of my prick against her vagina, so I didn't get
any cum on the bed, it just slipped inside.  The head of my
prick, that is.
     The feel of my big sister's cunny-lips snapping over the
head of my penis was too much.  I had planned on a nice long
session of bringing myself to the brink several times, before I
squirted my seed inside Elizabeth; but feeling her incredibly
tight big hole squeezing and milking on the head of my prick
caused me to cum almost instantaneously.
     Just like the previous night, this time It seemed to go on
and on.  Squirt after squirt of thick sticky cum spat into my
big sister's belly.  Gob after gob.  Jet after jet.  I must
have ejaculated almost a pint of warm greasy cum into my big
sister, and it's a wonder her flat big tummy didn't bulge from
the internal pressure.  I fell asleep that way, with my prick
holding my sperm bottled up in my big sister's womb.
     Two hours later, I repeated the job.  I woke up; found my
prick leaking cum in my big sister's belly, and slid the head
in and out until I came again.  This time, I made SURE I had the
head of my prick inside her, while I spasmed her tight big
tunnel full of warm greasy cum.
     In the morning, I did it again.  In fact, Elizabeth was just
starting to wake up, as I left the last sticky drop of incestuous
seed squirting in my big sister's hole.
     I don't know what Elizabeth thought about being so wet
between the legs, but she seemed to be embarrassed.  Perhaps she
thought she had been having a wet-dream.  For sure she didn't
seem to feel my prick pull out of her vagina, as she got up, and
then dashed for the bathroom to pee.
     Well, as you can imagine, I did it again.  And again, and
again.  For almost a month, Elizabeth stopped by every two or
three nights, and once she was asleep, I would fuck her.  By the
third time, I started trying to push more than just the head of
my prick inside her, and by the fifth, I was sliding my prick up
in my big sister's belly, until my balls were rubbing against
her bare big cunny lips.
     After that first disaster, I never wasted a drop outside of
Elizabeth's tight big hole.  And God was she Tight!  But that
made it feel all the better to my horny prick, and safer too; as
she was less likely to leak, once I had squirted inside her.
Usually, I would spend the whole night with my prick buried in my
big sister's body; only pulling out, when I woke up the next
morning.

     It's funny, but sliding my prick up inside her tight big
hole never seemed to disturb Elizabeth's sleep at all.  Not even
when it first went in, and it was all I could do to make it fit.
(God, she's tight!)  However, pulling it out, almost always did.
Quite a few times, I lay there and sweated, while Elizabeth's
breath grew ragged in the middle of the night, after I had came
inside her; waiting for her to go back to sleep, so I could clean
her up, while worrying about what she'd say if she figured out
why her crotch was such a mess.
     After a while though, I solved this problem by just leaving
it in my sister; bottling up my sperm inside her, until we got up
in the morning.  Since I usually woke up first, this worked out
pretty good.  As I said, usually I woke up first; pulling out,
and shaking Elizabeth at the same time, so she wouldn't associate
being woke up with the fact that my prick was no longer filling
her snug big hole, or the snapping sensation of her cunny-lips
popping off the head of her brother's prick.
     Twice though, Elizabeth woke up first.  Luckily, when she
woke up, she turned over; pulling my prick out of her before she
was fully awake to what was happening.  I shudder to think what
might have happened, if she had come fully awake, with my fat
prick still up inside her.  Oh well, it didn't, so why worry now?
     Elizabeth never seemed to notice until AFTER I had pulled out
that she was full of cum, and then she always seemed embarrassed
that I might find out that she had another "wet-dream"
     Ha!  Well, you know it didn't last forever like that.
     In fact, it's amazing that it lasted for the week-and-a-half
that it did.  The end, was precipitated, when my parents got up
one night, and didn't find Elizabeth in her bedroom.  So they went
looking for her.
     "Oh.  There she is.  Look, Cindy in here with
Billy."
     My father's words woke me from my half-doze, where I lay
with my half-hard prick still leaking cum in my big sister's
tight big hole.
     Oh shit!  I was dead!  When my parents saw me sleeping with
Elizabeth, they would just HAVE to know I was fucking her.  I
didn't even dare pull out, as the movement would have made our
sexual-joining that much more obvious.
     I lay there sweating, as I tried to pretend that Elizabeth
and I were just lying there, innocently sleeping together like
two kids who didn't even know there WAS such a thing as sex.
     Elizabeth just slept; making HER job easy.  I lay snuggled up
to her as close as I could, so our parents wouldn't be able to
see that my prick was inside my big sister, unless they
already knew it.
     This forced the last two inches of my prick into my big
sister's tight big snatch; bringing a murmur of satisfaction
from her, as she snuggled back in her sleep.  Once again, my
prick was buried to the balls in my big sister's vagina.
Oooh, did that feel good.  A squirt of pre-cum leaked out, as I
tried to remain still.
     It was incredibly hard not to thrust in and out, as
Elizabeth's vagina rippled and milked on my invading prick.  I
guess she was having sexy dreams, just like I had been.

     Well, I'm not completely sure how well it worked, but Mom
didn't come into the room screaming, when she saw my big
sister sleeping peacefully next to me.  In fact, she seemed to be
amused.
     "Oh, isn't that cute," she said.  "Elizabeth's getting to be
quite a sexy young woman."
     Oh shit!  Suddenly, I was sweating like heck, all over
again.
     "Uhuh," said Dad.  "If it wasn't her little brother she was
sleeping with, we might have to take precautions."
     "I suppose," said Mom.  "One of these days, When Elizabeth
starts having boyfriends, we're going to have to get her started
on some kind of birth-control."
     My hair stood on end.  Upt to then, I hadn't even THOUGHT
about the possibility of getting my big sister pregnant.  And
the big girl was sleeping at that moment, with a big helping
of my sperm soaking into her vagina, right up next to her
(possibly) fertile young womb.  I knew Elizabeth had
been menstruating for a few years, but in the heat of passion I
never gave it a thought.     I was so scared at the prospect, that
I almost missed my father's answer.
     Elizabeth's tight big tube squeezing on my prick, did
big for my composure either.  If I wasn't careful, I was going
to ejaculate yet another helping of my seed in MY SISTER'S womb,
and THIS time I wouldn't have ignorance of the fact that she
might get pregnant, as an excuse.
     "Well," Said Dad, "there's ONE way we might rig it, so we
don't have to worry about one of her boyfriends knocking Elizabeth
up, without putting her on the pill."
     I listened with all my might.  If there was a way out of
this mess, then I wanted to hear it.  How could Elizabeth be safe,
if she was fucking someone, and not using birth-control?  Right
then, I had a VERY personal interest!
     Even straining to hear, I missed it.  Dad must have
whispered in Mom's ear.
     "You're kidding!" she said.  I could hear the amusement in
her voice, so it must have been pretty funny.
     "Well," said my father, in a more normal tone, "Elizabeth
can't very well GET pregnant, if she's ALREADY pregnant by her
own big brother, now can she?"
     "You're incorrigible!" said Mom, but I could hear the
laughter in her voice.
     "No, just horny from seeing my little girl sleeping in the
same bed with her big brother.  Who knows, maybe Elizabeth is
ALREADY carrying Billy's baby in her sexy big tummy.  Wouldn't
that be a kick?"
     "You don't really MEAN that, do you?"
     "Well, I know if I was Billy in that bed with a sexy big
sister like Elizabeth there, I wouldn't be wasting my time
sleeping!  I'd be filling the big girl's cute big tummy so
full of baby-batter, she'd be having triplets before she gets out
of the high school.  Besides, wouldn't that solve the problem of
us having to worry about Elizabeth getting knocked-up by some kid
she hardly knows?"
     The light dimmed, as the door closed, and my parents backed
down the hall.
     "I guess it would, but WHAT a solution!"  Mom's voice was
fainter now.
     I could barely make out dad's, "Maybe.  But I can tell you
like the idea.  See?  You'd like to see Elizabeth's cute big
belly swelling, and her breasts dgetting bigger just as much as I
would."
     There was a squeal from my mother, and then their door
closed with a <click> and I couldn't hear any more.  I wasn't
listening anyway.  I knew enough.
     Just knowing that my parents WANTED me to get my big
sister pregnant, was too much for my overstimulated prick.  My
cock swelled up like a balloon, until it felt two-inches in
diameter, and sent another surge of life-giving sperm squirting
into my big sister's womb.
     This time, I didn't try to hold back.  Pushing in as hard as
I could, I sent bolt after thick creamy bolt of baby-making cum
as far up inside my big sister's belly as I could.
     It was only when I was slowing down, and the last big
trickle of cum was dribbling out of my half-hard prick, that I
realized my frantic thrusting had finally woke my big sister
up.
     Oh shit!  Maybe Mom and Dad wouldn't be mad if I got
Elizabeth pregnant, but then THEY were assuming that the big
girl would know what was happening when I did.  If my parents
found out that I had effectively raped their big girl, by
fucking her while she was asleep, and couldn't even object. . . I
was dead.
     Our parents love both of us, but Dad especially loves his
little girl.  When he found out I had raped her. . . I couldn't
bear to think of what might happen.
     Whatever punishment I thought up, Dad's would be worse.  Of
course, worse than that, would be the shame I would have to carry
the rest of my life.  I would never live it down.  I waited,
miserably, for Elizabeth to start yelling and screaming.
     "Mmm," said Elizabeth, sleepily.  "Billy?"
     "Uhuh?"  I didn't DARE say more, or even move.  My prick was
still half-in, and half-out of Elizabeth's sucking big vagina,
though by now it was limp as a noodle.
     If I pulled out though, there would probably be a flood of
cum all over the bed; not only making a mess, but drawing
attention to the very fact that I had not only fucked my big
sister, but I had ejaculated my incestuous sperm inside her as
well; possibly even getting her pregnant.  I was caught, either
way.
     "Billy," repeated Elizabeth, "are you fucking me?"
     "Uhuh," I replied again; waiting for the screams and
accusations to start.
     "Oh," murmured Elizabeth sleepily, "that's what I thought."
Then my sexy big sister snuggled her cute big butt back
into my stomach, and went back to sleep.