Note: This story was dynamically reformatted for online reading convenience.
 
 NOTE: THIS STORY IS COMPLETELY FICTION, AND IS INTENDED FOR THOSE WITH A
FART/ASS SNIFFING/INCEST FETISH- IF YOU FEEL AS THOUGH THIS DOES NOT
INTEREST YOU, DO NOT READ THIS!

   I live in a very normal house, in a very normal neighborhood, I've
attended normal schools, my life has been completely and utterly normal...
for the most part.  My family is not so normal.  I live in a feminine
household, as my father passed before I was even born.  Throughout my
entire childhood, I've lived with my mom, by older sister Amy and my
younger sister Katie.  Amy is four years older than I, Katie two years
younger.  My life at home was completely calm and simple up until about age
twelve...  then, my entire life was changed forever.  Now, I don't know why
or how I was born with such a disgusting disorder, but I suppose it really
wasn't my choice: I had a butt fetish.  And not just any butt fetish like
many other men have, I did and do not like to simply grab, but sniff.  My
other fetish developed over time, but that is a different story as to how
that one came to be: that fetish is farting.  That one came later, right
around the time that my life suddenly changed.  I was twelve years old.  My
mom had me when she was very young, and at the time, she was actually in
her early thirties, although I will never know her true age.  I believe
that she paid a big contribution to my butt fetish- she has, I must say, an
incredible bubble butt, an ass that many men would cum right away if they
saw.  So big, round, juicy, plump, beautiful, and my mom really was not
that bad looking.  My sisters inherited this quality, but not quite as
voluptuous.  Her ass jiggled with every move she made, and for my twelve
straight years of early childhood, this was my fixation- a hidden fixation,
of course.  One night, my mother and Amy got in an argument about God knows
what, which ended up with her drinking heavily afterwards to calm her
nerves.  I have no idea how much she drank that night, but I do know that
about an hour later, she was passed out on her bed, in her room.  Her door
had been closed, which meant that she did not want to be disturbed, but I
was very well aware, even at that age, that when a drunk person passes out,
there's nothing that can wake them.  Initially, I went into her room to see
if she is okay.  I did not expect to find my mom stark naked lying above
her covers, fully exposed.  She was sleeping on her side, her beautiful
dubble-bubble pointed outwards.  I had never seen my mom's ass bare before,
and when I saw it, my penis became instantly hard as a rock.  It was
throbbing, aching even, what with all of the hormones raging; I was just a
horny little school boy who dreamed of sexual stuff constantly-
specifically, sniffing butts.  My mom's ass was a dream, I had always felt
as though it could never possibly happen for her to let me, but here I was,
presented with the opportunity of a lifetime, one that I felt would never
come again.  I dove into her bed gently, so as to not wake her, and put my
nose up to her anus, getting as close as I possibly could without touching
it.  I took a deep breath- it smelt like heaven.  It just had the right
smell to it: not sweaty, but not too clean, just minimally dirty so as to
leave behind what we all know as "the butt smell." It made my cock throb
even more, so I began to stroke it slowly, although I did not want to go
fast, I didn't want to wake her.  Her butt cheeks were even bigger as it
sat just millimeters away from my face.  The smell began to get addicting,
her ass began to draw me in with it's scent, I simply couldn't help myself-
before I knew it, my face was fully submerged between her buttcheeks, my
nose brushing against her anus.  The smell made me cum in about ten
seconds. And there was a lot of it.  I used the pajama pants I had taken
off to masturbate to wipe up the cum, then I put my pants back on, turned
around, open the door, and close it behind me, breathing heavily.  The
words, "never again" echoed in my brain for the rest of the night.

   The next morning, I came downstairs hungry and craving cereal.  I was so
glad it was summer vacation, and that I could sleep in; this made it so
that whenever I went downstairs, I was alone and felt free- no annoying
sisters to fight for the tv with, no having to listen to them gossip about
boys and things, just freedom.  But when I came downstairs that morning,
they were down there talking, which was unusual.  Right when I walked in,
they stopped talking and turned to me, with faces that looked as though
they were trying to hold back laughter.  "Hey, little bro," Amy said. 
"Umm, hey," I replied awkwardly, and began my search for cereal, milk, bowl
and a spoon.  They began to whisper behind me, too quiet for me to make out
what they were saying.  I decided to ignore it, turn on the tv, eat, and
then go back upstairs.  They watched me with every move I made, the whole
way through, with looks of humor on their faces.  As I passed my mother's
room, I heard her call out my name.  "What is it, mom?" I asked from the
hallway.  "Can you come here for a minute, and shut the door behind you?"
"Yeah, sure," I responded- when I entered the room initially, she was
nowhere in sight.  "Mom, where are you?" "In the bathroom, sweetie.  Come
here for a second." I did so, and saw that she was fully naked, facing a
wall, butt facing me.  I shielded my eyes and pretended as hard as I
possibly could to be disgusted.  "Mom, put on a robe or something!  That's
gross!" "You don't need to lie to me, honey," she said calmly.  "I have a
confession to make: I wasn't fully asleep last night." I gulped, and began
to shake.  "I think we need to have a little talk." "Mom, I can explain!" I
started, but knew that I could not explain anything- this was too
embarrassing.  "Calm down, baby, don't worry, mommy's not mad at you." She
took on a slightly even calmer tone of voice.  "You're not?" I asked,
shaking?  "No, silly!  It's a part of nature!  You just need a little
experience." I exhaled, but became suddenly alert at her mentioning of
"experience." "Wait, what do you mean?" "Well, you're growing to be a big
boy now, and I think it's time you learned how big boy's treat their
mommies." "How's that?" Shaking again.  "They sniff their mommy's butts! 
Sniff my butt!  Come on, sniff mommy's big bubble butt!" "Mom, this is
getting weird, I'm really not comfortable with this." I tried to leave, but
she grabbed me by the shirt collar and forced my face in between her butt
cheeks.  "I'm sorry, honey, mommy's not giving you a choice.  Sniff baby,
take a big deep breath!  Worship my ass!" Who was I kidding?  Why not give
in?  I grabbed both cheeks and shoved my head in as far as it would go, and
her hand on the back of my head helped me.  "You like that, don't you?  You
like mommy's stinky butt!  Come on, show me how much you love my ass!" Now
I really couldn't control myself.  I sniffed as hard as I possibly could,
trying so hard to avoid touching the massive hard-on throbbing away
underneath my thin pants.  It was clearly showing.  She let go of my head
and ordered me to lay on her bed, facing up.  I did as I was told, and soon
found my own mom's thick juicy stinky butt hovering right above my face. 
Then everything went black as she sat herself down, and began to swerve
side to side.  "I had a feeling you had a butt fetish; I look through your
browser history all the time.  It kinda gives me an idea as to what I can
do to make you cum without me even having to touch your puny little cock."
Suddenly she decided to put all of her body weight on me, so that I
couldn't even breath.  I began to squirm.  But I got some air soon
enough... PPFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFTTTTTT A long, wet fart blew
out of my mom's butt and right onto my nose!  I was starting to get
extremely close to cumming, and I think she knew this.  "Amy, Katie, you
can come in now!  And start recording right when you enter the room!" My
heart dropped.  What was she doing?  This wasn't fair!  I began to squirm a
lot now, trying as hard as I possibly could to get myself free, to get the
fuck out of there.  But I wasn't fast enough: before I was even able to
slip my head out of my mother's butt crack at least, I heard the door open.
"Whoa, mom!  What's going on here?" I could hear Amy taunting me as I
squirmed.  "Hey, don't blame me, kids.  He came up to me while I was
getting dressed, and asked me if he could sniff my butt." That bitch!  "I
let him, but then he started begging me to sit on his face, because he
like's asses that much, the little pervert!  You girls have one gross
brother!  And gross people have gross things happen to them!"
pffffffFFFFFFFFFFFFFTTTTTttttt....  PFFFffffffffftttttttt.... 
pFFFfffffttTTTT...  three massive eggy farts in a row; I couldn't help the
fact that my cock was rock solid, but I tried as hard as I could to break
free.  "Mommy," Katie said, "I don't think he likes your farts that much. I
think they're too stinky for him." "Don't worry, sweetheart, he's just
squirming because he's so excited.  See his little pee-pee?" And she gave
it a flick, making a little pre-cum ooze out. 
PPPPPPPPPPPPPFFFFFFFFFFFFFFTTTTTT...PPPFFFFFFFFFFFFFFFFFFFTTTTTT.... 
PPPPFFFFFTTTTTTTTTTTTTTT....  PFFFFFFFFFFFFFFFFFFFFTT....  "I can't even
smell any of my farts because he's breathing them all in!  How nice of him!
Let's check on his penis, shall we?" She began to pull off my pants, a
difficult task for a person squirming as much as I was.  I won't lie: I was
trying to breathe them all in.  They were wet, juicy, eggy, and just
absolutely amazing.  My dick flicked upright as my pants were tugged off.
"I think he's really enjoying himself!" Then, she took my hand by the wrist
and placed it on my throbbing cock, and even wrapped the fingers around it
herself.  I simply couldn't hesitate.  I began masturbating furiously, and
came in probably less than a minute, but before I did... 
PPPFFFFFFFFFFFFFTTTTFFFFFFFFFFTT!!!!!!  It wasn't the longest one, but it
was the strongest one, and the loudest.  That was the fart that made me
cum, and it shot up like a rocket.  "Well, it looks like your pathetic
little brother has a fart fetish, how cute!" There was a pause, which
probably meant that the recording was over.  My mom got off of me, and my
face still tried to sniff her ass as she got up- I didn't need to be horny
to want it.  "What was that for?" I shouted, looking at all of them. 
"Here's the deal, shitface!" My mother shouted to my with authoritarian
dominance.  "You're going to be our fart slave until we decide to let you
go.  Whenever one of us farts, you better be there to inhale all of it; we
don't want to have to smell our own farts, they're way worse than most
people's, especially Katie's.  Each of us has the right to take you
whereever we want to go, and we reserve the right to force you to sniff our
farts in public.  In addition, you have to sniff all of our butts whenever
we ask you too, even if we just took a shit.  And if we tell you to wipe it
or lick it or kiss it, do it!  Worship our asses!" "What if I don't want
to?" I said, raising my voice.  "That's fine with us," Amy said to me.  "As
long as you're fine with being called a fart-sniffer at school." Fuck. 
Blackmail.  I felt my world crumbling down, my fetish becoming my life. 
And it would be that way until I decided to move out.  "Mommy," Katie said
to her in an innocent voice.  "I have to fart."