Swapping My Wife for Her Sister

My wife Sarah and I have always had a good sex life.
Both of us were in our late 30’s and we routinely had
sex three to four times a week even after having two
kids. Standing at 5’1″ with dirty blonde hair and light
blue eyes Sarah’s body was quite sexy for a woman at any
age. On occasion Sarah and I would role play and one of
our role playing scenarios involved her pretending to be
her younger sister Catherine. This scenario was by far
my favorite as I often would find myself jerking off
thinking of having sex with my sister-in-law.

One night my wife and I were over at Catherine’s house
celebrating the construction of her new pool with her
husband Tony. It was a hot and humid July day, perfect
pool weather. The four of us started drinking sometime
in the mid afternoon and sometime after sunset the
combination of sun and alcohol had given all of us quite
a serious buzz.

All day I had found myself looking at Catherine in her
little black bikini. Catherine stood about 5’4″, had
dark brown hair and brown eyes. She had given birth to
twins a year earlier which caused her breasts to go from
an average B cup to a full D cup. Somehow Catherine
managed to keep those large tits while losing most of
her baby weight. With her full hips, and firm lean legs,
this had been the first time in two years that Catherine
had worn a bikini and as a result of her top being a too
small, her tits looked like they were ready to burst out
at any given moment.

As the night went on and the liquor kept flowing, Sarah
had mentioned how nice it was that her parents had
agreed to take all of the kids for the night and that we
were all free to enjoy ourselves. Because of our freedom
we found ourselves drinking more than usual and even
found ourselves playing drinking games. One of the games
we played was, “I never ever�” Simply put the game is
played by someone saying something like I never ever
flown on an airplane. Anyone that has flown on a plane
drinks.

When it came to my turn to ask the question, I said, “I
never ever (with the exception of porn) watched two
people have sex.”
At this point Tony takes a drink. Catherine turns her
head towards Tony, her mouth wide open, her words
beginning to slur, looks at her husband and says,
“WHEN?!”

Tony goes on to tell a story about when he and his
brother and sister-in-law went away a few years ago, how
the two of them thought Tony was asleep and how they
tried to quietly fuck without waking him.

Catherine, still shocked says, “Is that why you came
home horny as hell from that trip? I thought it was
caused you missed me?”

Tony looks at her and says, “Don’t complain, I seem to
remember you cumming three times that night!”

“So if we were to fuck right now I would be doing my
sister a favor because Frank would fuck her as good as
you fucked me that night?” Catherine asked in what
seemed to be a joking manner.

As Tony shrugged, as if to suggest she was correct.
Although the tone Catherine was using sounded sarcastic
something told me that this could possibly happen and I
quickly chimed in, “Yes and Sarah would thank you for
several weeks to come.”

At this point, Catherine bluffs and says, “Let’s do it!”

Tony calling her bluff stands up and says, “Ok.”

After what seemed like an eternity of me holding my
breathing hoping that this would happen, my normally
conservative and overly shy sister-in-law, still
sitting, removes her bikini top revealing those
beautiful tits I had been admiring all day. At this
point my cock comes to life and by the time Catherine’s
top hits the floor my dick is fully erect. Tony follows
his wife and drops his trunks; however the alcohol must
have really been taking its toll on him because his dick
was only half erect. Taking a step closer to Catherine,
she grabs his half erect shaft in her hand and wraps her
full red lips around it. Both sitting in stunned
silence, Sarah and I just watched as Catherine’s head
bobbed up and down on her husband’s cock as she tried in
vain to get him hard.

After a few minutes of watching this go on, Catherine
takes Tony’s cock out of her mouth, looks at Sarah and
says, “You want to give me a HAND with this thing?”

Sarah looks at me and I quickly nod for her to do so. It
didn’t take Sarah too much convincing because as soon as
I gave my approval, she was up on her feet and over to
them almost immediately. Even before Sarah wrapped her
well manicured fingers around Tony’s member his cock
started springing to life and after only a few strokes
from my lovely wife, his cock was fully erect and ready
to go. At that moment, I knew that Tony wanted to fuck
Sarah as much as I wanted to fuck Catherine and judging
by how quick my wife had grabbed Tony’s cock, she wanted
to fuck him as well.

Once Sarah released Tony’s cock from her hand, Tony
leaned Catherine back on the deck chair, spread her legs
and slid his throbbing member into his wife’s eager
pussy. I had the perfect position to watch as Tony’s
back was to me, Catherine was on her back, her legs
spread with her hands holding behind her knees and her
feet up in the air. I could clearly watch his cock slide
in and out of Catherine’s beautiful pussy.

As I watched Catherine getting fuck by her husband, my
balls were screaming for me to release my load. After
stroking Tony’s cock, my wife had taken a couple of
steps back and just stood there watching her sister
getting fucked by her husband. This went on for a few
minutes and just as I was about to stand up, grab Sarah,
rip her bikini off and begin savagely fucking her to
satisfy my own desires I heard Catherine say, “No. Don’t
lose it.”

I looked back towards Catherine and Tony and while Tony
was still pounding away at her pussy, I noticed that his
cock was beginning to soften again. At this point, I
whispered into Sarah’s ear, “Why don’t you fuck him
instead of giving him a couple of tugs? If she can’t get
him off, maybe you can.”

A little shocked by what I had just said Sarah leaned
away from me and said, “Are you sure?”

I nodded and said, “I’ve always told you I wanted to
watch another man fuck you, now’s my chance.”

Quickly, Sarah stripped off her bikini top revealing her
perky B cup tits and I watched her taught full ass
appear as she stepped out of her bottoms.

Half drunk and not realizing that Sarah was now
completely naked behind him, Tony turns his head to the
side and without completely looking towards Sarah, says
to her, “Do you mind giving me a hand again?”

At this point Tony turns around to see Sarah completely
nude as she replies, “I’ve got something better for
you.”

Sarah walks over to another deck chair and with her back
to him, gets on her knees and elbows so her head is just
a few inches from the seat and her tight little ass is
elevated right in front of Tony. As I stared at my
wife’s ass and her yearning pussy, I noticed how her
pussy juice was forming little drops on her sparse pubic
hair. Sarah briefly wiggled her ass in front of Tony
before turning to look at him over her shoulder. Sarah
doesn’t say a word. She just gives him a, “Fuck me” look
that I’ve never seen her give before. His cock, no
longer having problems getting hard, Tony turns from his
wife and takes a step towards Sarah.

Grabbing Sarah’s shoulder with one hand and using the
other to grab the base of his cock, Tony slides it into
Sarah’s waiting juicy fuck hole. Balls deep in my wife,
Tony pauses to enjoy Sarah’s sweet little sex pot. At
that moment she begins to push back and gyrate her hips
ever so slowly at first. Tony moves his hands to grab
Sarah’s hips while thrusting his cock even further into
Sarah causing her to gyrate a little bit faster and
causing her to let out a sharp little, “Ugh!”

Looking at Sarah’s face, I could see she was in pure
ecstasy. Her head was looking down and her mouth was
open as if she wanted to moan, but the sheer pleasure
she was feeling had somehow stolen her voice. Based on
my many experiences with her in the past I knew it
wouldn’t be long before she would cum.

Tony, also sensing that Sarah was close to cumming,
would pull his cock back ever so slightly and then ram
back in each time with a forceful, “SLAP!” Unable to
make a sound, Sarah continues to gyrate her hips faster
and faster. Her voice came back to her as she began to
moan, “Oh! Oh! Oh my God! Your hard cock feels so good!
Give it to me just like that!”

Not long after, Sarah’s head snaps back, her body
tenses, her eyes open wide, looking straight ahead she
screams, “OH MY GOD! I’M CUMMING! UGH!” Her toes curl
and her fist clench, Sarah’s pussy clamps down on Tony’s
cock like a vice. While Sarah is cumming Tony quickly
moves his hands from her hips to her shoulders and uses
his right knee to push Sarah’s legs further apart,
allowing him to sink his rigid tool even deeper into her
tightening love box. Sarah then slowly lowers her head
and her body goes limp. Breathless, the two paused for a
second to allow Sarah regain her composure.

While all this was going on I was using my thumb to rub
my raging hard on through my swim trunks. I briefly
thought about pulling out my cock and rubbing one out
right there, but this was the first time I’d ever seen
another couple fuck right in front of me and since my
wife was part of that couple I figured I’d just as well
fuck her once Tony was done. Then it came to me,
Catherine was still there!

I was so busy watching this other guy fuck my wife that
I had briefly forgotten about her. I turned and looked
over at her sitting on the deck chair that her husband
had left her on. She seemed to have a different frame of
mind about the whole situation. She had a stunned
astonished look on her face as she watched her husband
fuck her sister right in front of her.

Neither one of them had asked her if it was ok and
neither one of them cared if it was ok, they just went
and did it! I looked at her face and for a split second
I felt a little bad for her, but after that split second
I looked at her gorgeous flowing brown hair, then her
beautiful brown eyes and then I focused on those full
soft lips.

My eyes moved downward and I gazed at her full D cup
tits that I had been staring at all day. My cock jumped
in my shorts and all thoughts of pity quickly dispersed.
My eyes then took a long look at her long lean legs. I
thought to myself I’ve jerked off to this girl many
times and if I was ever going to get a chance to fuck
her it was now or never.

I was certain that Catherine saw me gazing at her out of
the corner of her eyes; however she didn’t return the
look. Her eyes stayed focused on her husband fucking her
sister. I looked back at Sarah and Tony. She was now on
her back with her legs spread wide with Tony on top of
her rapidly ramming his cock in and out of her pussy.
His balls were slapping against Sarah’s ass with a
frantic FWOP FWOP FWOP sound.

It was Tony’s turn to grunt with pleasure as Sarah’s
pretty blue eyes focused on his long lean body ramming
away at hers. Knowing that the two of them were busy at
the moment, I knew this was my chance to act. I stood
up, quickly stripped off my swim trunks and walked over
to Catherine.

Approaching her from the side, I knew she saw me, but
she didn’t turn to acknowledge me until I was about a
step away from her. When she finally did turn to look at
me, her big brown eyes were at the same level as my
cock. Slowly her gaze turned upwards from my cock to my
chest to finally she was looking me in the eyes.

In one sudden move, I grabbed her, squared her to me and
pushed her back onto the deck chair in which she was
sitting. Offering some resistance to my advance,
Catherine initially tried to verbalize a protest as a
muffled, “NO!” tried to come out; however I quickly
kissed her to ensure I wasn’t interrupted by her husband
or sister. Using my chest to pin her down and while I
was still kissing her, I quickly positioned both my
hands on the underside of her knees and spread her legs
as far apart as I could.

In the next instant, like a trained sniper hitting the
bull’s eye I drove my cock deep into her pussy.
Catherine’s pussy wasn’t as wet as I would’ve liked it
to be, in fact when I initially drove my cock into her
she flinched a bit, but I didn’t care. This is the pussy
I had craved for so long and I was in complete bliss.

After I slid my cock back and forth in her a few times,
I pulled my mouth away from hers and looked over at Tony
and Sarah to see if they were still keeping each other
preoccupied. Tony was ramming her even more furiously
now while my wife was encouraging his assault.
“Fuck me Tony! Fuck me good and hard!” Sarah moaned.
“Fuck my pussy like you’ve wanted to for all these
years!”

At that moment Tony tensed up, let out a loud, “UGH!”
shooting his jizz deep into Sarah’s tight little cunt.

I turned my attention back to Catherine; my rigid cock
was slowly going back and forth inside her. She was
lying still staring ahead blankly with a defeated look
on her face, betrayed by her husband and sister and now
being forced to fuck by her brother-in-law, Catherine
offered no further resistance. Although my balls were
begging for me to blow my load immediately, I wanted to
make this last and I wanted to see if I could make her
enjoy it whether she wanted to or not.

Whispering in her ear I said “spread your legs some more
for me Cat.” She complied.

This allowed me to further penetrate her pussy. “God
you’re so much tighter than Sarah. I often imagined
you’d be tighter than her, but not this much tighter.” I
whispered into her ear.

I saw a look of discomfort come across her face as I
rammed my cock deeper into her. Holding still for a
couple of seconds while I loosened her up, I pulled back
and then slowly rammed my cock back into her again and
again. This started to have the affect I was looking for
as Catherine’s pussy became more and wet with each
thrust. After a few minutes of this, I whispered in her
ear, “I want you to pinch my nipple with one hand and
use your mouth to suck on the other one.”

Catherine begrudgingly complied with my request as I
felt her lips wrap around my right nipple, her tongue
darting in and out of her mouth, while her hand gently
pinched my nipple. I was in shear heaven. Not only was I
fucking my beautiful sister-in-law, she was doing
whatever I told her to do. I also have to admit, the
fact that I was in complete control and that I didn’t
have to worry about any consequences from my wife or her
husband turned me on even more.

Not long after Catherine began playing with my nipples,
she began to bring her legs closer together and again, I
told her to spread them. She did, but eventually she
would begin to close them again. I finally got fed up. I
grabbed the underside of both her knees, pushed them as
far apart as possible and began to ram her harder.
Catherine lips detached from my nipple as she let out a
little whimper, but at the same time her pussy was now
soaked and I felt the juice from her cunt running down
my balls.

Catherine was trying so desperately to not enjoy what
was happening to her, but each and every thrust was
causing her the slightest bit of pain and a whole lot of
pleasure. Catherine’s body began to betray her more and
more and looking at her face, I could see in her eyes,
pleasure was beginning to overtake her and she hated
herself for it.

She was on the verge of cumming as her pussy continued
to get wetter and her breathing began to quicken,
however my balls had just about enough of holding out
and they were demanding to release their load. Just as I
felt I could no longer hold off on blowing my load, my
wife kneels down next to her sister, looks up at me and
says, “Cum all over her tits and I’ll suck it off of
her.”

At that moment Catherine bites her lower lip, her eyes
roll back and her hands instinctively grab onto my hips
pulling my thrusts even deeper into her, she lets out a
loud, “UGH! OHHH! Holy shit!” She was cumming as hard as
I’ve ever seen any woman cum before. I briefly stop my
ramming her to watch her sexy little body tense up while
her tight little cunt grabbed a hold of my cock like
it’s never been grabbed before.

A few seconds later I resume my ramming. Feeling my
balls beginning to tighten and my load ready to spew, I
scramble up Catherine’s chest, and go to straddle her at
about her sternum. Sarah quickly grabs my shaft and I
hear her order her sister, “Squeeze his balls Cat!
Squeeze his balls!”

Catherine quickly complies with her sister’s orders and
as I settle onto her, I feel Sarah’s delicate hand
firmly stroking my rock hard cock and her sister’s soft
delicate hand cup my tightening balls. Looking at
Catherine’s beautiful face while she’s looking at my
cock, I erupt like the volcano that destroyed Pompeii.

I start by spewing thick loads of cum that completely
bypass her tits and land on her chin and cheek. While
continuing to expertly stroke my cock, half way through
my eruption, my wife angles my shaft down some more and
I continue to cum all over Catherine’s luscious tits.

True to her word, Sarah sucks up every last drop of my
seed off of Catherine’s tits. When she finishes with
herself appointed task, she then takes my cock into her
mouth and completely cleans it off of any leftover jizz
and the left over coating of her sister’s salty beaver
juice.

Once the moment had passed and none of us where horny
anymore, the four of us weren’t really sure what to say
to one another. We sat there briefly in an awkward
silence. I got up, trying to break the silence telling
everyone, “I’m going to get another drink. Anyone want
one?”

To which Tony replied, “Actually, I’ve got some Viagra
upstairs. Do you want some of that instead?”

I coyly looked over at Sarah to see what her reaction
would be. Her face lit up with a big beautiful smile as
she looked over at Catherine to see what her reaction
would be, to which she replied, “Fuck yeah! If I’m going
to cum like that again, let’s do it!”

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