Note: This story was dynamically reformatted for online reading convenience.
 
 Mom and Sister Conceive By Muffin Stuffer

   A quickie of how a brother and sister experience their first coupling as
a result of watching their parents in the throes of baby-making.

   <bang knock> <bang knock> <bang knock> <bang knock> the sounds started
slowly then increasingly became louder <bang knock> <bang knock> <bang
knock> <bang knock> and faster.  Children in the other room were awakened
by the <bang knock> <bang knock>.

   Sarah, 14, had heard the sounds before when she was younger.  She never
gave them much thought, just thinking they were sounds of the night.  But
now she was curious, inquisitive.  She had an itching feeling in her loins,
between her young legs that she had not noticed before.  The sounds seemed
to beg her to investigate.

   Jason, 15, lay in bed wide awake listening to the same rhythmic sounds
his penis hard and moist, dripping his pre-come onto the sheets.  He, too,
was inquisitive about the source of the sound.  He got out of bed and in
the dim light of the night light bumped into his sister.  "Shhhhhh" he said
as she started to say something.  She was wearing one of his old T-shirts
that was threadbare.  Her growing breasts pushed the fabric and showing the
points of her hard nipples.

   He took her hand and they crept towards the sound.  It was getting
louder as they approached their parents' bedroom.  The door was slightly
ajar.  They gently pushed it open further.  The night light combined with
moonlight filtering through the curtains softly lit the bed.  They could
see mom lying on her back with her legs tightly wrapped around their father
who was lying on top.  The shadows were such they couldn't make out exactly
what they were seeing but his butt was bouncing up and down in rhythm to
the sound they heard.

   Each time he thrust down mom would make a "hmmmph" ing sound.  It became
obvious that they were having intercourse, something he had read about in
sex-ed class.  In the vernacular it is called fucking.  His cock got hard
watching his dad.  Sarah's pussy was getting even more itchy as she heard
and saw what was happening.

   They had been watching for just a couple of minutes when mom raised up
and hugged her lover tightly as she shuddered.  She loudly "Aahhhhhhhhd and
Aiiiieeeeeeeeee'd" as her legs tightened about her lover.  "ARRRRRRRRGhhhh"
was heard from both as it seemed he drove hard into her and then was still.

   Mom's eyes opened in a stare as she orgasmed and felt the blast of his
emission deep inside her body.  She saw shadows of two people watching.  It
took a minute for her mind to recognize two of her kids watching in
wonderment.  She tightened her grip with her legs causing her lover to emit
another groan.

   "T...he... ki...ddds... dad... Th...ey....  Seen... us..." she whispered
as her body shook from her ecstasy.  It was some minutes before dad
realized what she had said.  "Call them in." he whispered.  "It's time they
learned first hand."

   "Oh... Dan... you think we should?" She whispered back.

   "Yes, It's like when we were kids and our parents caught us.  Sarah is
probably still virgin and Jason too.  Have you noticed if his sheets were
crusty or wet in the mornings?"

   "Yes, they were damp and crusty just last week.  It's like that maybe
once every two weeks or so for that past year.  Why?" Mom asked.

   "I bet he is virile if it's been that long." Dad said quietly, his cock
still jerking within her gripping channel.

   "Sarah has been having periods for about a year too.  She finished about
8 days ago so she is probably close to being ripe." Mom replied.

   "Sarah, Jason... Come in here please." Mom called.

   The kids quietly, cautiously came into the room.  Dad flipped on the
bedside lamp illuminating the bed and themselves.  The kids could now
clearly see his balls resting against mom's butt and his penis unseen
because it was imbedded into his mom's vagina.

   "Take off your clothes and get up here with us," coaxed dad.  "It's
okay. You're not in any trouble."

   Sarah and Jason looked at each other.  It was a look of bewilderment. 
They hadn't seen each other naked for a few years and now... well now they
were being told to get naked in front of their parents and each other. 
Jason started to say something, "Ummmm.." "Jason, don't be embarrassed."
Mom said.  "It's not like I haven't seen you before or Sarah.  Dad, scoot
over and give them room to lie up here with us."

   Dad and she scooted as the kids took off their night clothes.  Jason's
penis was a very hard, straight, six inches and an inch thick.  It was
quite sizeable for a boy his age and still growing.  Sarah, had nice B cup
breasts with pronounced nipples.  Mom held out her hand to them and they
climbed into bed with them.  Mom and dad separated his cock pulling out
with a `plop'.

   Jason and Sarah just stared, mouths open as they saw dad's penis and
mom's vagina.  Mom was still open and some whitish fluid was leaking onto
the sheets and dad's penis was thick and long still wet with their fluids.
A drop of fluid was hanging by a thread to the hole in his penis.

   "Kids, its time you learned how babies come into the world.  Mom and I
were making a new brother or sister for you." Dad said.  "We know you have
5 other siblings and this will be the last for us.  We are hoping it will
be a girl to even out the sexes among you.  You both are old enough to
begin making love and tonight, hopefully, you will."

   "Dad, Sarah is my sister and that's not right." Jason said.

   "Your mother and I are brother and sister, as are your uncles and aunts.
It is tradition in our family." Dad said.

   "Jason do you love your sister, Sarah?" mom asked.

   "Yes I do..."

   "Sarah, do you love your brother, Jason?" she asked again.

   "Yeah, I do.  I ..."

   "Kiss each other." Mom demanded.

   They kissed like brother and sister.

   "No, kiss like lovers..  Make love to each other like we do.  You see?"
and then she and dad kissed with open mouths, lots of tongue and with
moaning sounds.

   Jason reached for Sarah and drew her to him.  He kissed her lips and
then licked his lips along with hers.  It was an overwhelming feeling for
both.  Immediately they felt a new passion and he pushed her back so she
lay on her back and he lay across her.  He pressed his lips hard against
her mouth as his passion increased.

   Sarah reached around him in a hug and spread her legs.  She kissed him
back like he was kissing her.  She felt soft hands on her belly caressing
down to her lightly covered pubes.  She spread wider as a finger penetrated
her slit.  It was an awesome feel to her.  She moaned still kissing her
brother.

   Jason, too, felt a hand touch his cock.  It was a soft and tender touch
gripping my cock shaft and then his balls.

   "Jason," mom said, "Crawl over on top of your sister and raise up a
little.  Dad will position you.  Okay?"

   "Yeah mom, are you sure?  I don't want to hurt her." Jason said.

   "It's ok son," dad added.  "Now raise up."

   "That's it" he said as Jason raised up.

   Jason's cock was touching her entrance when Dad slapped and pushed
Jason's butt causing his cock to slam all the way into his sister.  She
screamed, "ARRRRRRGHH AIIEEEEEEE" as her hymen was ripped and his thickness
filled her virgin passage.

   "Stay still son." Mom said.  "Sarah, it's ok now honey.  Jason's not
going to move to let you get used to it being in there." Jason kissed his
sister, again with passion and lust.  "I'm sorry sis.  I love you..  God
you're tight..  It feels so nice.." he said.

   Sarah's pain soon lessened and she moved slightly.  Jason withdrew a bit
and then pushed back going deeper this time.  His pelvis was rubbing
against her and her clitoris was getting massaged from the outside and
internally too.  She thrust up even in pain as her passion and trip into
love land began.

   A couple of minutes later and Jason had moved just enough to trigger his
spewing his seed deep into Sarah.  They were kissing the whole time and
neither realized she had been impregnated.  Neither really cared at this
point anyway since the pleasure was so wonderful to them.

   Mom and dad saw Jason's balls suck up and then drop and knew Sarah had
gotten a load of his seed.  They were so happy that they re-coupled hoping
together they would conceive together.

   Dad and mom got the bed to knockin' again and the kids were the
benefactors of the bouncing.  Jason rolled over to let his sister on top.
She found a new thrill as this new position aligned her cervix directly
over his pee hole and when he flooded her again it shot directly into her
baby tubes.  He locked his legs around hers as they did the mating dance of
love uncaring as to the result.  They were just lost in their own passion
and both were sated when he filled her one last time.  His balls were
aching from the exertion but the love/lust he felt was more meaningful to
them both.

   When the bed quit rockin' they all fell asleep in the last position they
were in.  Sometime during their slumber each of the women conceived.  They
would not know for a couple of weeks but that mattered not.

   The End