Note: This story was dynamically reformatted for online reading convenience.
 
 Titel: Sin Sister - The Untold Story
Author: CrazyChris
Keywords: FF futa on female cumshot big breast huge cock
Summary: In this story we follow the lives of 4 girls who's names are:
Kayla, Tatiana, Yelena & Breanna.

   **********

   Note: I am always opend for feedback from my readers, if you want to
provided me with feedback then please contact me at: Crazychrisx1 AT
outlook DOT com, and to add to that, English is NOT my main language just
so its out there, so there might possibly be a few typos in my stories!
Note 2: All credit goes to the artis named TheDude3DX for the females, i

just write about them :)

   **********

   Kayla woke up to that alarm clock going nuts, she got up and shut the
alarm off, the only thing that left her mouth was a annoying grunt, she
shock her head a bit too wake up, she got up and made her way to the
bathroom, she had a nice pair of D size breast that both had a pair of
pointy nipples that screamed to be sucked on, she also had a bubble round
but that was almost soft as a feather, it was soft enough where, when she
walked it bounced lightly, now there was 1 "thing" she had which she knew
separated her from other girls, it was dangling between her legs at 6
inches when it was not erect.  But would be a massive 12 inches long and
around 4 inches in growth when erect, she arrived at the bathroom.  She
undressed and got into the shower, turned on the water and started washing
her hair, all the time during this, she felt her "thing" between her legs
slowly wake up, and eventually it reached its maximum length at 12 inches,
it already twitched from time to time, and when Kayla noticed that her dick
had woken up and was fully erect.  She knew it wouldn't go away for the
first, she looked to the bathroom door waited a few seconds, before her
left hand ever so slowly made its way down to her rock hard dick.  Her
right hand went to her right breast, and without her knowing she started
massaging it, which occasionally resulted in her pinching her nipple, and
each time she did so, her dick responded by twitching, and each time she
pinched her nipple she couldn't help but release a moan.  Suddenly she
gasped for air, she looked down and found out her left hand had found her
dick and was rubbing the head, recently she has found out with the help of
her step sister Yelena, how to achieve pleasure by rubbing her own dick,
until today she really didnt notice her dick, she didn't really think about
it, all she thought.  Was that it could be annoying from time to time, but
now here she was, in the shower, masturbating, rubbing the head of her
dick, and massaging her boobs, her dick would do the occasionally twitches.
While moans would escape her mouth, and it didn't take long before she felt
the familiar sensation in her dick, as well as her balls, which by the way
was the size of a golf ball.  when her balls tightened and it don't take
long before she felt her cum making its way up her dick.  And that's when
her dick opened like a fountain, ropes of hot thick white cum shooting out
of her dick, which splashed onto the shower glass door, her eyes shut
tight, all she thought about was the amazing sensation and her incredible
orgasm she was having.  For a whole 15 seconds, cum shot out of her dick
and splashed at the glass door, which would poor down the glass and make a
small puddle of both water and cum on the shower floor, when she came to a
halt, she shock her head and looked down, her dick was slowly getting soft,
her balls had stopped twitching after unloading weeks worth of cum, again
she looked over at the bathroom door, nothing.  That's when it hit her, she
had spent about an hour by now in the shower, she quickly washed her hair,
and then the glass door, she noticed the bathroom was filled with the smell
of sex.  So she's opened up one of the cabin above the sink grabbed her
favorite perfume, and did 3 sprays of it.  Which was enough to cover the
smell, she grabbed a towel, excited the bathroom and went to her room, she
grabbed a basic T-shirt, and a perfect matching skirt which was long enough
to hide her dick.  As Kayla made some quick breakfast, her phone went off,
Kayla picked it up and answered the call.  "Hello, this is Kayla McKinnon,
who is this" It was quiet for a while on the other end, until a female
voice spoke up.  "Hi am Breanna, Breanna McKinnon, um....  We need to talk,
could you meet me at Mike's cafe in 30 minutes?" Kayla was stocked, did she
just hear the female on the phone say her last name was MCKinnon as well?
Did her dad forget to mention something to her?  Thoughts where going nuts
in Kayla's mind, since Kayla had been adopted by a man called Ian McKinnon,
he never told her, he had a daughter.  Kayla looked at the watch, she got
30 minutes to get to Mike's cafe, which is only 5 blocks from her
apartment, she grabbed her purse and went to the cafe where Breanna was
waiting.



   Kayla arrived at the cafe 5 minutes before the time, she went inside,
found a empty table day down and waited.  That's when she was approached by
a blonde female, who looked to be in her early 20's and she guessed her
boob size was the same as hers, which was a D cup, what Kayla also noticed
was that Breanna didn't have a bra on, which meant she could see 2 small
bumps which she guessed was her nipples.  When Kayla thought about that,
she could feel that the beast between her leg started waking up again, but
her thought was interrupted when Breanna spoke up.  "Hi, are you Kayla by
any means?  Like Kayla McKinnon?" Within a split second Kayla answered. 
"Yes that's me, who are you?  Breanna am guessing right?" "Your correct, am
Breanna, you don't know me, but umm...  I don't know how to say this,
but....  Umm..  am your step-sister" Kayla was shocked, she just got it
confirmed that she now, has a step sister.  who looked smoking hot, she had
a perfect body, which had 2 lovely looking boobs, which she would guess was
arching for attention.  They looked to be at least a D cup now that she got
a closer look, Kayla wasn't exactly sure how to respond to this type of
news, should she be angry, happy or sad?.  But she figured she had to speak
sooner or later.  "Well..  Umm..  I had no clue I had a step-sister out
there, its very nice too meet you Breanna" Breanna's face was light up with
happiness, she was smiling from head to toe.  Breanna decided to find out
more about her step-sister so she asked where Kayla was born and who her
biological parents were.  "So..  How did you end up with my dad?  Did he
find you on the street or?" Kayla hated taking about her past but she knew
it would haunt her forever and it's just a matter of time before it would
come back to her.  So she decided to be honest with her newly found
step-sister.  'Well as a starter, I was born in Russia or Soviet Union as
it was called back then.  My parents had to put me and my sister up for
adoption, at least after the Afghan war.  Which turned out to be a huge
failure, i was brought here when i was 10 years old, by an adoption agency.
I'd guess about a week into my stay, i had this man approaching me, he
asked me a few questions, i gave him answers.  I guess he liked me, because
the next day, he adopted me, thats also when he said his name was Ian
Mckinnon.  He took care of me more then what my biological parents could,
he gave me food, drink, money, a house to live in, i really started to look
at him as more then just a stranger, but as my father.  now 10 years later,
am here, talking to you." Breanna showed great interest in Kayla's story,
she didnt know her parents where commies.  But she figured Kayla didnt
bother about it, and she was surprised that she survived living in Russia
and then getting to the states.  At least what Breanna had heard about
Russia was never good, she had heard stories about kids trying to escape
the horrible country.  But most didnt make it past the border, some where
shot, some where taken by the army and never seen again.  Breanna was
bought back to reality from her thoughts, when Kayla asked her a question.
"Now that you know more about me, i wanna know about you, how did you end
up with Ian?" Breanna chuckled a bit before answering.  "He was married to
my Mom, and they had sex and a few months later, i arrive into the world.
He he, funny when i think of it, when i was 5 years old.  My mom left dad
and she suddenly didnt want anything to do with either me or Ian, so he had
to take care of me alone, i dont blame him tho.  I found out, that dad had
caught mom cheating on him, it was hard for him in the start, but he got
the hang of it.  and then he became rich because of a research project he
did at work, which took off like fire on dry grass.  I dont think he
expected money to get involved in my childhood, like he expected a little
bit i think, like to buy me food and such, but eventually he knew i would
grow up and had to be able to live on my own.  So he ended up doing a
foundation -¯in my name, so when i became 18, that foundation would go to
my bank account, now about 4 years later.  Here i am, talking to you, haha"




   For the next hour Breanna and Kayla talked about each other, when the
clock was nearing midnight, the girls figured it is time to head home.  Now
Kayla was far from her apartment, and to make things worst, not only did
her car decide to break down, but it also started pouring down with rain.
Breanna didn -(TM)t like leaving people out, so she offer kayla a ride and
a place to crash at, til the morning at least.  "If you want, you could
crash at my place Kayla, i dont mind, i got well enough space for both of
us" Kayla without hesitation accepted the offer, both girls jumped into the
car and drove of to Breanna's house.  Once they arrived, they got inside
and talked for another hour, before they called it the night, Breanna went
to her bedroom, while Kayla took the guest room, she removed her skirt, she
was thankful that her dick wasn't hard.  If so she would have a hard time
getting asleep, but instead it was as soft as it could be, so she quickly
got into bed and fell asleep. -¯



   The next morning Kayla awoke to sun lighting up the guest room, she got
up and that -(TM)s when.  She realized her T-shirt had some stains on it,
so she took it off and found a spare one in the bathroom, which had a note
attached, with her name on it.  It was pink colored and she figured it was
meant for Breanna instead of herself due to the size, but it was better
then having to go naked the whole day.  So she put it on, immediately she
knew it was meant for Breanna, it was incredibly tight around her chest,
her nipples were clearly visible through the top.  And it could barely make
it past her boobs.  But again it was better then nothing, so she excited
the bathroom, went downstairs, called out for Breanna.  "BREANNA YOU THERE,
IT'S ME KAYLA, HELLO" She got no response so she started to check the
house, kitchen nothing, bedroom nothing, living room nothing.  After
searching the rest of house she figured Breanna was doing some errands -¯or
something, so she went too the living room, sat down on the couch.  Grabbed
the remote for the TV, clicked the power button, nothing, she let out a
frustrating groan, she hoped she could watch some TV before Breanna got
home.  But she the TV said no, so she laid down on the couch and closed her
eyes, and before she knew it.  Her thoughts started wandering to the times
she spent in Moscow with her sister Yelena, now while Kayla's thoughts
where re-capturing the moments in Moscow with her sister, her body started
waking up.  Blood started pumping into her dick causing it to ever so
slowly to wake up, by going from soft to fully erect within a minute.  That
-(TM)s when Kayla felt the familiar twitch in her dick, she opened her eyes
and noticed her dick had gone fully erect, 12 inches pointing straight up,
and what looked like pre-cum gathering on the tip.  "great...  this is
EXACTLY what i need...  am in my step-sisters house, and my dick is hard as
a rock...  not what i needed" Kayla thought, first she tried to just shake
it off and hope it would go down.  in reality...  it didnt, she got the
opposite effect, her dick got harder and twitched more, Kayla in the end
just gave up on the whole situation.  She got her self up from the couch
instead of laying down on it, she looked around the house and made sure
nobody was home before she did what she was about to do.  Which was to
masturbate til she had an orgasm, as far as she knew, each time her dick
went rock hard, the only way to make it go away is to masturbate til she
cums.  Again she looked around making sure she was alone, when she was
positive that she was indeed alone.  Her right hand made its way down to
the bottom of the shaft while her left hand went to the head, the moment
her left hand made contact with the head, she couldn't help but gasp of the
pleasure it gave her, she started slowly rubbing the head, and when she got
a rhythm going.  Her right hand started moving up and down the shaft, after
going on about for a minute, she looked around one last time, making sure
she is absolutely alone.  She changes her sitting position, her left legs
lays down on the couch while her right leg, stays up, forming an upside
down V shape with her leg, when she is comfortable.  She lowers her mouth
to the head of her dick, she sticks her tongue out and starts moving it in
a circular motion on the head, when she feels the head is wet enough, she
lowers her mouth to a point where she has taken the head of her dick in her
mouth.  She then starts to bob her head up and down as far as she can, and
runs her tongue all over the head.  It doesn't take long before the living
room is filled with slurping sounds and muffed moans from Kayla, and after
blowing her self for about 2 minutes.  She feels the familiar sensation in
her balls, her mouth leaves the head of her dick with a pop, before she
starts to furiously rub the head, she knows she is very close, she can feel
her balls tightening and her dick starts pulsating and growing in growth a
tiny bit.  Eventually she reaches the point of no-return, she fells the cum
making its way up to the tip, to avoid being heard, Kayla bites down on her
lower lips, and to avoid making a mess on Breanna's couch, she tries her
best to hold it back, suddenly the cums forces its way up the dick and out
the opening.  1 spurt flies a few inches in the air before it lands on her
belly, while the rest that makes it out, covers the head and starts pouring
down the shaft.  by now Kayla's eyes are shot tight, she wants to just
scream and enjoy the moment, but she knows she gotta be quick, the last
thing she wants is to be caught by her step-sister masturbating and cumming
on her couch.  After cumming for about 10 seconds it comes to a halt, but
her dick is still half covered in her own cum, she takes a deep breath and
tires to figure out what to do next.



   Suddenly and without warning, Kayla hears the sound of a door opening.
her body locks up, she stays completely still, thats when she hears it. 
click...click...click...click...click, she remembers what that is..  high
heels...  and that means only 1 thing, Breanna has arrived home.  Now every
single alarm in Kayla's mind is going of, her dick is still half covered in
her cum, she is still super sensetive, she can hear the sound of high heels
right above her now, she looks up, and sees the blonde hair of her step
sisters, crap..  she knows she is fucked if Breanna sees her like this,
dick half covered in cum.  Half naked on the couch, going by instinct,
Kayla grabs the bottom of her still-rock hard dick and takes a deep breath
before she moves her hand up to the head, most of the cum goes on her hand,
she quickly sticks her tongue out and licks up as much cum from her hands
as possible, now she can hear the high heels in the stairs.  But by now,
the cum that was on her dick is now in her stomach, but she still got the
issue that her dick is still rock hard, and it wont go away, so in a
desperate move, Kayla grabs her dick with both hands and forces it down,
she manage to get the head between her thigh, and covers up the exposed
parts with her hands.  And just as she manages to cover it all up, her
step-sister Breanna comes down the stairs, too see Kayla on the couch on
her knees, in one of her pink T-shirts which is obviously too small for
her, since it looks like her nipples are about to make a hole in it. 
"There you are Kayla, figured you were awoke by now, Good morning by the
way" Kayla still trying to act like nothing happens, manages to scramble a
few words and greet her.  "Good morning...  Breanna" Breanna decides to
walk over to Kayla, she stretches out her arms which looks like she wants
to give Kayla a hug.  Kayla buys this of course, but just as Breanna is
about to go for the hug...  her hands goes underneath Kayla's T-shirt
causing it to expose Kayla's boobs, which as soon as the cold air hits
Kayla's nipples, she cant help it but release a low moan, and when
Breanna's fingers touches her nipples, she gaps and looses the grip of her
dick, now, her thighs are already covered in a tiny bit of pre-cum so as
soon as Kayla releases the grip on the dick.  it slips out and point -(TM)s
straight up, the moment Breanna sees the dick, she freaks out and jumps
away, now before her, is a 12 inch dick hard as a diamond.  arching for
more release and attention, now Kayla freaks out and instead of running
upstairs and locks her self in the guest room, her body locks up...  again,
while in front of her, is her step-sister, eyes wide as they can, she is
exchanging look from Kayla to her dick, Kayla, dick, Kayla, dick. 
eventually she shakes her head and decide to find out why Kayla haven't
told her about this.  "Why...didnt you tell me you had a dick?" Kayla is
still scared of her mind, but manages to come up with an answer. 
"I....I..I didnt tell you because i was afraid of what you would say about
me, the girls who i spoke to about my "condition", made fun of me and i
wasnt sure if you were going to react the same way or not" Breanna was
partly pissed of, but partly understandable, the only reason why she was
angry on Kayla for not telling her about it, is because if she had, they
would have probably have had sex by now.  "thats....understandable" Now in
Breanna's mind, all she can think of now, is the ways to give Kayla the
pleasure she wants or what her dick wants, and Kayla notices this.  Since
Breanna's facial expression goes from shocked to smiling, and it doesn't
take long before Breanna moves closer to Kayla, she sits down next to her,
while switching between looking at Kayla and her dick.  That -(TM)s when
she gets a great idea to draw Kayla into having sex with her.  "Have you...
ever..  you know, had sex with someone with that before?" Breanna asks
while pointing at Kayla's dick, and before Kayla can answer, she can feel a
pair of hands grabbing the bottom of her shaft.  the moment Breanna's hand
touches Kayla's shaft, she cant help but moan and gasp.  The next thing
Kayla feels before she can even start to process whats going on, is
something warm and wet going from the bottom of her shaft to the head, when
she looks down to see what it is, she finds her self shocked.  Breanna is
licking Kayla's shaft, when she reaches the head, her tongue swirls around
the tip, which causes Kayla to throw her head back and by now, all rules
have gone out the window.  she is just enjoying the ride for now, Breanna
then decides to make the pleasure better for Kayla, by opening her mouth
and gradually takes her dick in her mouth, the moment Kayla feels this, she
gasps and lets out a load moan.  "fuckkkk, that feels good, oh shit,
whatever you are doing Breanna, dont stop" Breanna in her mind, have no
plans to stop, while she is sucking on the head.  Her hands are wrapped
around the shaft and is moving them in a up and down motion, after giving
Kayla a blowjob for a few minutes,  -¯Breanna releases Kayla dick with a
loud pop, and lays down on the couch.  she pulls her panties to the side,
exposing her tight and wet pussy to Kayla, now Kayla knows where this is
going, so she moves her self closer to Breanna, grabs her dick and slaps
Breanna's pussy a few times, which causes Breanna to moan, both girls looks
each other in the eyes.  "Fuck me Kayla, i want that inside of me NOW" When
Kayla hears this, her dick twitches, and Kayla is more then happy to oblige
to Breanna's wish, so she grabs her dick again, rubs the head in a up and
down motion on Breanna -(TM)s lips, before she lowers it to the opening of
Breanna's pussy.  She looks at her one final time, she sees Breanna nods,
thats when Kayla slowly applies pressure, she can see the head slowly
disappearing before the rest of the dick follows.  Breanna's eyes goes as
wide as they can, she has never felt anything this good before, she can
feel her walls being stretched to its limits.  it feels like someone is
stuffing her with a pole, but instead of telling Kayla to stop, she lets
her push more of her dick inside of her, and eventually she feels Kayla's
balls touching her ass cheeks.  Which gives her a good indicating that
Kayla is now fully inside of her, whole 12 inches.  Kayla decides to stay
still so Breanna can get used to the length and growth of her dick, that's
when she feels Breanna moving her hips.  Which gives Kayla the hint to
start moving inn and out, she starts slowly but, gradually increase her
speed, for each thrust Kayla does, the more Breanna moans and for each
thrust, new pleasure is being discovered, when Kayla is basically moving
like a piston inn and out.  Her balls slapping against Breanna's ass
cheeks, for Kayla it feels like she is moving inn and out in a tight
slippery tunnel.  and it doesn't take long before she feels Breanna getting
tighter and tighter, which gives get a good hint that Breanna is getting
closer and closer to reaching climax.  and it doesn't take long for Kayla
either before she feels her balls tighten and she can feel that something
is building up inside of her.  "FUCK, keep going Kayla, oh shit, it feels
good, oh god I think am gonna cuuuuuummm....  FUUUUCK" when Kayla feels
Breanna clamping down on her dick, she losses it too and for her, it feels
like her dick is in a vacuum pump.  If it wasn't for her strength, she
would have exploded inside of her, but in the last moment, she pulls out,
her butts smacks down on the couch and her dick opens up, cum shooting out
like a fountain, when Breanna sees the amount of cum Kayla shots out, she
freezes, now Breanna has had her fair share in dicks -¯in her lifetime, but
nobody came as much as kayla.  Her eyes went as wide as they could, and
without Breanna knowing her self, her left hand had made its way to Kayla's
dick, and when she felt Kayla's dick twitch, she shock her head and was
brought back to reality.  Her hand had gone almost to the top of Kayla's
dick, it rested just below the head, and all she could do was to stare at
the amount of cum that was now slowly squeezing it self out, and started
leaking down, Breanna could feel the heat of the cum when it touched get
skin.  She looked down, and stuck her tongue out, and took a quick lick of
her hand and tasted Kayla's cum.  "Mmmmmmm...  That tasted delicious"
Breanna looked up at Kayla and slowly lowered her head to the tip of
Kayla's dick and took a mouth full of cum and swallowed it all, this whole
time.  kayla looked at Breanna with shocked eyes, and without her self
knowing she had moved her head closer to her dick and had as well taken a
mouthful of her own cum, both girls looked at each other as they both stick
out their tongue and both took a mouth full of cum.



   When Kayla's dick had stopped leaking cum and she had come down from her
orgasm, she laid down on the couch and closed her eyes for a moment.  While
her eyes was closed she heard and felt movement in the couch, when she
opened her eyes she saw, Breanna standing up, she pulled her pink tube off
and took her panties off, Kayla could feel her dick waking up again, and it
didn't take long before her dick reached its peak time at 12 inches.  When
Breanna was out of her clothes she walked over to the railings to the
stairs, she bent over showing her bubble butt and glistering wet pussy,
when she was sure Kayla was watching her ass, she gave it a quick shake. 
Which in turn got her a moan from behind, and it didn't take long before
she felt someone touching get ass, and when she looked behind her, she saw
Kayla looking at her with a devilish grin, and that's when she felt
something wet poking her asshole.  and before she could protest, Kayla
showed her thump into Breanna's ass, which got a squeal and then moans. 
Kayla figured Breanna was into anal, so she got up, grabbed her rock hard
dick, pointed it at her asshole, when she applied pressure it slipped and
went inside her pussy instead.  Whole 12 inches, which got Breanna to
scream of pleasure, and caused her to have an orgasm right there, which
Kayla of course noticed as she felt Breanna's pussy suddenly clamp down on
her dick, it got incredibly tighter.  She didnt dare too move until Breanna
at least got down from her orgasm, after giving Breanna about a minute,
Kayla slowly started moving her hips, and gradually she increased her
thrusting, at one point Kayla, reached the point where she was screwing
Breanna to a point that she felt her balls slap against her butt cheeks. 
And from time to time, Kayla would show her whole length inside of Breanna
and hold it for a few seconds before she continued, At this point Breanna
was breathing heavily, and thought she was about to pass out.  But she
could never get enough of having Kayla drilling her dick inside of her
pussy, for Kayla it was a feeling she never wanted to end, but she knew she
could only take so much before she reached her limit in either orgasm or
exhaustion of fucking.  And Kayla wasnt exactly up for killing her dick
permanently or causing injuries, but she kept going for as long as she
could, and it didnt take long before she again.  Felt the familiar
sensation in her balls, she knew she was close, and she knew Breanna was
close as well, since she could feel her pussy getting tighter and tighter
for each thrust she did, and eventually she reached the point of no return.
She could feel the cum starting to make its way out, just as Kayla was
about to pull out...  Breanna had a intense orgasm, she could feel Kayla
starting to pull out, and something ticked in her mind, and before she knew
it, she somehow loost foothold of the floor and fell backwards.....  which
Kayla did NOT expect and did NOT have time to counter, since before Kayla
knew it, Breanna followed suit.  Kayla's ass smacked down on the couch with
Breanna inside of her, while she is reaching climax, Kayla tried her best
to warn Breanna.  "Bree.......  off me....  am...  CUUUU....  FUUUUUUCK..
HERE IT COMES" and with that, Kayla's hands went straight to Breanna's tits
and squeezed them, Breanna at one point wondered what was wrong with Kayla,
but then...  she felt it...  the heat of Kayla's cum blasting her womb,
Breanna had never allowed ANYONE to cum inside of her, but at this time..
she was too lazy and too struck by the amount of orgasm she had, so she
just savored the moment and enjoyed the sensation of having her pussy
filled up with Kayla's cum, and she loved how her dick twitched inside of
her pussy.  She looked down at her pussy and could see a slight bump around
her stomach region, and thats when she felt Kayla's dick moving it self
out, the moment it left her pussy, it opened up again and sprayed some cum
on her stomach and part of her tits, this whole time.  Kayla's thoughts
where in wonderland, she squeezed Breanna's tits and just enjoyed filling
her, until her dick had to push it self out and sprayed rest of its load on
her stomach and most of her tits, when Kayla came down from her intense
orgasm, she was too lazy and to star struck to get up.  So she just layed
on the couch, with Breanna on top of her, half covered in her cum.  Or at
least her tits covered, her eyes slowly closing and before she knew it, she
fell asleep.  and shortly after Breanna followed suit and fell asleep as
well.