Note: This story was dynamically reformatted for online reading convenience.
 
 story codes: mast, inc, unaware

   The night before my girlfriend Kate's younger sister Peggy was to
arrive, we had an intriguing chat about (not-really) incest.  Essentially,
half in jest, but in full earnest, Kate gave me permission to have sex with
either her mother or her baby sister.  We laughed about various
possibilities, but I didn't really give it any serious consideration.

   I had met Peggy before.  She was cute, 10 years younger than Kate and,
although there was a soft outer shell, she was in incredibly good shape. 
The soft exterior came from a love of beer, but basically she skiied for a
living and for fun she mountain climbed, kayaked, hiked and did whatever
else people can do in the wilderness without a net.

   I also knew from Kate, that although her sister loved beer, it was more
of a hobby than an issue.  Her issue (though I prefer to think of it as a
passion) was sex.  She was basically a nymphomaniac.  We already knew that
while she would be staying with us for a few days as she was in town for a
wedding, she would be spending most of her free time with various hook ups
she had arranged before even making her plane reservations to come back
east.

   We drove to the airport and collected Peg with no real delays.  I got a
big and more than just friendly, hug and back to the house we went.  We
hung around and had no plans for the evening, just a quiet meal at home and
some sisterly catching up for the girls.  Peggy was actually planning to
stay with us the next day and night, to be followed by the wedding and some
time with 'a friend' afterward.  She let us know that he was mobile and
would get her home safe that evening.

   So, good for all of us.  We had some time to spend together.  I liked
Peggy.  She was a cool person to hang around with and she and Kate really
got along well.  It was a nice family sort of time we would have.

   I should mention about Kate.  While she was not the spectacularly wanton
slut that Peggy was, she was damn close.  She not only kept me physically
busy, meeting her various needs, she had a wonderfully devilish personality
that constantly came up with new and exciting sex ideas.  Truly, my kind of
gal.

   I had opened up to Kate early on in our relationship about my own kinky
history and perversions.  I was filled with trepidation.  Most women aren't
really able to accept some of the stuff that turns me on.  But instead of
making an 'eww' face, Kate got this hot burning look in her eyes and told
me that she was incredibly turned on by everything I had just told her. 
Not only that, but wherever we decided to go with it, she would be a
willing partner.  I was bowled over.  I really couldn't believe my...luck?
Good fortune?  I didn't know what to call it, but I had been gifted with it
and I knew I was truly grateful.  And then, she told me a few things she
wanted to try...Words can not describe.

   The ladies stayed up late chatting and talking family gossip and stuff.
Not that I had anything to do the next morning, except walk the dog, I
opted to get a good night's sleep and leave the beauties to their own
devices.  Kate finally came to bed and snuggled close next to me and
whispered, 'Thank you'.  I supposed for leaving them alone for a few hours
to just be themselves.  She was happy.  I, therefore, was supremely happy -
and all I had to have done to accomplish it was prepare to walk the dog. 
God, I'm good.

   The next morning, I was up first and out the door I went with our
Siberian Husky, Magic.  He was a great companion dog, especially if you
liked quiet, mellow sort of walks.  As far as dogs went, he was a
contemplative soul.  Kind of stand-offish in a crowd, but surprisingly
playful with his few friends.  I was always amused to watch him be silly
with another dog on our block.  I think he had a crush on her, but he was
out of luck - he had been snipped before he was allowed to leave the
shelter where we got him.

   When we got back from our nice long walk, the girls were just beginning
to stir.  I peeked in on Peggy and she mumbled something that sounded like,
'Cereal' to my question about breakfast.  Easy enough, but I knew that Kate
(and I) (and Magic) would be looking for something a bit more filling.  We
didn't always share with Magic, but this was a special occasion, so he
could have some eggs for his lustrous coat and some sausage or bacon for
his happy taste buds.

   Kate wandered out of our bedroom in a short robe, looking like a lost
waif with sleep in her eyes.  I had the milk in one hand and had just
poured the cereal into a bowl as she fitted herself into my arms and
snuggled close.  It was a nice day, not cold or anything, but you know how
that departure from the bed can seem like such a shock.  Another warm body
is like a life preserver in the ocean, something to cling to until reality
is allowed to seep its way into your brain.  So there I was with Kate
holding me close, milk in one hand and the other wrapped around her waist.

   My little vixen began to get some ideas and began to snuggle a bit more
suggestively into my body.  Happily, I squeezed her closer and began to
respond in my own fashion.  I heard a sound of pleasure emanate from my
girl and she slid one hand from around my back to between my legs.  I made
my own rumblings of pleasure as she did that.  Slowly, she began to stroke
me and I was enjoying this little moment before the day really began.

   Quietly, Kate asked what my plan was for breakfast.  I mentioned the
cereal for Peggy and suggested omelettes and meat for us.  Kate opined that
Peggy would probably be interested in both her cereal and some eggs, so to
make enough for all three of us.  But, instead of detaching herself from
me, so I could get breakfast moving, she started stroking my hardening cock
with obvious intention.

   She reached into my sweatpants, lowered them down around my knees and
was slooowly stroking me and caressing my balls with real tender loving
care.  I looked over her shoulder to make sure Peggy wasn't about to walk
in on us.  We lived in a bungalow and there wasn't much distance between
the living room couch, where Peggy lay, and the kitchen where some
interesting intimacy was occurring.

   Kate caught my look and smiled.  'Pegs is back asleep.  Half a comment
and then she's unconscious again.' I allowed myself to relax at that,
letting Kate find her rhythm and enjoying the feelings coursing through my
body, liking the idea that Kate's sister was scant feet from us.  I let my
thoughts wander to Peggy's lithe body, considering her own warm skin as she
allowed her self the luxury of a bit more sleep on our living room couch.
There was some fun free association over the idea of Kate, Peggy and I
sharing a bed (I happily ignored the fact that Kate had told me the night
prior to Peggy's arrival that I could have her if I could pull it off, but
she wasn't interested in her sister like that.) These perverted thoughts
along with Kate's excellent touches were bringing me close to orgasm.

   I let Kate know this, unsure of where she would want me to land my cum.
She was a real equal opportunity cum lover.  On her face, in her hair
(which most girls just hate), in her mouth, on her body - belly, breasts,
ass, thighs - she just loved cum wherever.  But this time was apparently
going to be something surprisingly different.  Naughtily, dirtily
surprising.  I think I mentioned that Kate had a devilish personality.  It
was about to present itself.

   As she stroked me, she began to talk to me.  Not the usual
run-of-the-mill sex talk, but very specific talk about her sister.  Her
likes, her wants.  She mentioned she enjoyed gangbangs.  Fucking strangers.
Sneaking into beds that weren't hers.  And that apparently, like Kate, she
loved cum.

   All this was really getting to me.  I was now trying to hold off from
cumming - and Kate, minx that she was , was edging me perfectly, keeping me
from falling over the edge inadvertently.  She had some idea for my cum
this morning and I supposed I wasn't ready for it, just yet.  We had had to
be quiet, of necessity, while she told me these intimate details of her
sister's sexual delights.  But it was becoming more and more difficult for
me to stay that way.  Grunts and loud sighs were beginning to escape me,
whether I wanted them to or not.

   Just as I was about to reach the point of no return, Kate reached over
and took the half forgotten milk container from my hand.  Deftly, since the
other hand was otherwise occupied, she opened the carton with one hand and
sort of sloshed the milk around.  In my extreme situation my thoughts
immediately went to a little sexual peccadillo that both of us enjoyed.

   Frequently, I would make us coffee.  I drank mine black, but Kate would
ask for just a little milk.  One day, while she waited in the living room,
I was feeling a little horny and decided to give her coffee a bit of extra
protein.  I took my cock out and, keeping an eye out for Kate, like I just
had for Peggy, I stroked myself hard and then came quickly, directly into
Kate's mug.  I poured the coffee as soon as it was ready and added a little
real milk for good measure.

   I brought it out and was immediately hard again, watching her sip the
hot coffee and compliment me at its flavor.  This was a ritual and didn't
ascribe anything to it, but I knew she was sipping my cum.  I also knew she
wouldn't mind.  I was just waiting to share my deviance for a bit as I
watched her drink it this way.  Eventually, I had to tell her.

   I watched her face go from shock to surprise to enticed in milliseconds.
She slurped the rest up with gusto - to both our amusement.  Thereafter, I
made it a regular addition to her coffee as often as I could.  She would
often ask, to make sure and on one or two occasions when I had not made my
expected contribution, she came right over to me with her cup and
essentially milked me for her serving of cum.

   That was what I immediately thought of when she took the milk carton
from me.  But I didn't expect her to do what she did with it.  I was blown
away by the idea.  She held the opening of the carton directly in front of
my cock tip and began those final touches that would guarantee an explosion
of cum from my cock, straight into our milk.  The milk that was yet
unpoured into Peggy's cereal.  The same unpoured milk for our omelettes,
coffee and whatever else we might use it for that day - baking or
whatever...

   I looked down at Kate as she stroked me with such excellent tenderness,
moving me closer and closer to an orgasm that I knew was going to be a
large and powerful one.  She smiled at me, nodding at me, reading my mind
again.  'Yesss, her cereal, and her eggs, and...  ' Before she could tick
off another food that would be filled with my cum and be gobbled up by her
sister, I began to orgasm.

   My god, it was an incredibly powerful.  Every muscle in my body spasmed
from my curling toes on up to my face.  I tried to be quiet, but I was
overwhelmed by how strong this was.  And volume?!  Out of control - like a
dam had burst.  Blast after ropy blast of cum, mostly going into the milk
but some missing and splashing Kate's hands, the sides of the container,
onto the floor, where our unconcerned but constantly hungry and curious dog
licked it up - which actually had a surprisingly exciting effect on both of
us.  (More on that another time.)

   All of a sudden, from the living room, came a voice calling, 'What are
you two doing in there?' Which brought about for me a practically unheard
of second orgasm, even before the first was completely finished.  My balls
clenched, my body spasmed and Kate, who was unprepared to aim me into the
milk container for this second wave brightly solved the mess problem by
covering my erupting cock with her mouth and suckling every last drop of
cum from my body.

   Even though I was in the middle of some powerful orgasming, I had to
answer Peggy, as Kate was obviously indisposed.  'Nothing', I called back,
'just a little accident with the milk, but everything's under control'. 
'OK, is it safe to come in?' 'Oh, sure,' I responded, 'all cleaned up, now.
Let me just pour the milk into your cereal'.  In one motion, Kate stood up,
both lifting my sweats back into place and handing me the milk container. I
closed it and shook it for maximum distribution of my semen and began to
pour, as Peggy padded into the kitchen, looking like a carbon copy of her
sister just a few moments ago.

   Just to really mess with me, in the most tantalizing way possible, Kate
took her sister in her arms and hugged her and then gave her a lovely wet
kiss on the lips, exclaiming, 'Good morning, baby sister.  Did you sleep
well?' Watching Kate kiss her sister with those cum covered lips was hot
enough to stir my cock, even after two back to back orgasms.  I also
realized that Kate had relieved herself of the cum which had found itself
onto her hands by letting Peggy's hair wipe it from her fingers.  But
knowing that she did it purely for my pleasure made me feel so intimately
connected to her at that moment, it was as beautiful as it was twisted.

   Over the course of the day, Kate seemed to think of every possible use
for milk you can imagine.  The cereal, the omelettes, cupcakes, she even
fed Peggy a milkshake in the afternoon.  That one was extra special.  As
Kate mixed the ingredients I slid up behind my baby girl and slipped my
hand down her pants to play with her a little and discovered she was
sopping wet.  I commented that she must really love feeding her sister my
cum.  Kate pressed her ass against me and said, 'More than either of us
imagined.  I'm as surprised as you.  But, now I don't know if I can stop',
she giggled.

   I slipped my finger between the lips of Kate's wonderfully dripping
pussy and tried to scoop out as much of her juices as I could.  I covered
her neck in kisses as I extracted my hand from her pants as carefully as I
could and while she watched - and gasped in surprise?  In excitement? 
Disturbance at the idea?  - I dipped every part of my wet fingers into the
large glass she had been making the shake in.  I swirled my fingers around,
letting the cum-filled milk and ice cream wash my little girl's sweet
nectar off to join the other ingredients for a top off to a belly full of
cum for Kate's baby sister.

   Although we didn't have a chance to play further while Peggy was in on
this trip, we were both so horny with Peggy around, we were uncontrollable.
It was really funny, but we would be groping each other every chance we
got. If Peggy turned her head, Kate would practically give me a blow job.
And I wold be ready to cum just as quickly.  While Peggy was asleep that
night, Kate brought me into the living room and sucked me to completion as
I sat across the coffee table from where Peggy slept.  The next night,
while Peggy was out getting her own NY fun, Kate slipped into a pair of her
sister's panties and came to bed.  Eventually, she climbed onto my face,
and as I licked her through this unfamiliar pair of panties she informed me
they were her sister's and they were used...did I like the taste?  I
removed the panties from her body and made her sit on my cock.  She watched
me lick the crotch, with the flavors of both her and her sister as well as
inhale both their perfumes until I came.  She said it felt like I came as
much as it looked like I did the day before, into the milk.

   Ultimately, prior to Peggy's departure, Kate brought in her sister's
last pairs of clean panties.  While she lay next to me, alternately
stroking and sucking me, she described how she had decided she wanted to
watch me fuck her sister - not in hiding, not in secret, but have me seduce
Peggy and fuck her silly while Kate watched and masturbated to orgasm after
wild orgasm.  I was so blown away by what my sweet little girl was saying,
I came as strongly as ever.  (It was a wonder I didn't end up in a nursing
home after those few days - some sort of over-sexed rehabilitation patient)
Instead of catching my cum in her mouth, Kate let me cum onto my chest and
belly.  Then, carefully, she began to lick me clean and use the last clean
pairs of panties to daub up bits of my cum into the cotton crotches.  She
smiled sweetly at me as she did this, saying, 'So Peggy's pussy has
something to remember you by, too.  At least, until next time.'