Babysitting Marissa  (mg,nepi,baby,toddler,diapers,oral,rimjob,ws,scat)

by Full Diaper



AUTHOR'S NOTE: Everything written below is purely fiction!




   When my parents first told me that they would be adopting a new sister,
I was not exactly thrilled.  I was 15, and the last thing that I wanted to
deal with was a screaming, pooping, puking baby in the house.  After all,
at that age, the only thing that I wanted to do was smoke weed, play video
games, and watch porn.  In fact, that was how I spent nearly every weekend.
See, I was a bit of a late bloomer and an introvert, and I found comfort in
my life prior to Marissa.  I certainly did not want her messing up my
schedule of gaming, getting high, and jacking off to my hearts content. 
However, I did not know of all the special, secret fun we would have over
the years.

   She was being adopted at the age of five months old, because her
biological family could no longer afford to care for her after the
recession.  We knew them through the church we belonged to, and overall,
they were good people.  My parents had also known them from back in the
day, and they knew that we would take good care of her.  I even played
baseball with their oldest son, Ed.  However, ever since she was born, I
looked at Marissa different.  Something inside me wanted her.  Lusted for
her.  I was interested in babies in a special way from a young age.  I
remember watching cartoons in which a baby may be featured for an episode.
I remember my small, prepubescent cock getting hard whenever they filled
their diaper, often with green stink lines trailing their recently made
mess.  It was beyond an interest for me.  It was an obsession.  I would
spend hours online, finding pictures of babies.  Even when none sexualized,
they aroused me.  I was weirdly ashamed to admit it, but I was attracted to
them.  However, as I got older, I grew to embrace it.

   We adopted Marissa officially on January 3rd.  Over the next few months,
I would grow closer to her.  I would assist in feeding her, cleaning her
occasional spit up, and making her laugh when she wouldn't stop crying.  I
believed myself to be a great older brother.  I especially loved her diaper
changes though.  It brought me such joy, watching her slit be cleaned while
she babbled and smiled.  I could also make her laugh by making silly faces
and making amusing sounds.  Even if we were not biological brother and
sister, I truly loved her, in more ways than one.

   Marissa was growing rather fast.  At just seven months, she was quite
chunky and plump.  She had round, puffy cheeks and a hard belly laugh,
which I loved to hear.  After she was in the family for two months, I
lusted for her even more.  It was a tease to constantly be around her, but
never getting the chance to do what I really wanted to do with her.  It
drove me mad, and I was constantly waiting for a chance to spend alone time
with her.  So you can imagine what I thought when my parents said that they
would need me to watch her while they went shopping for her new clothes. 
Her fast growth meant that she had outgrown almost everything we had bought
her when she first moved in with us.  The nearest baby clothing store was
three towns over.  We lived in a rather rural area.

   I told my parents that it would be no problem, and that I had plenty of
experience with her over the past two months of her staying with us.  That
was true, as I had spent quite a lot of time with her.  I looked forward to
seeing her every day after school.  I enjoyed dinnertime, when she would
sit with us and eat her first solid foods.  This chance to have some alone
time with her meant that I would finally get to fulfill some of my
fantasies.

   When the time came for my parents to leave, my dad handed her off to me.


   "Thank you so much for this.  Really.  We won't be too long."

   "Take your time." I said endearingly.

   I wanted them to take as long as possible, so that I could take my time
and be gentle with my beautiful sister.

   As soon as they closed the door, I gazed into Marissa's deep blue eyes.
They were like crystal clear pools of water.  I had the desire to kiss her.
My cock was rock hard in my sweatpants already.  I leaned in and planted a
soft kiss on her plump baby lips.  They tasted of fruit.  "Oh, you cute
little thing.  I think we're going to have fun together."

   I ticked her and bounced her up and down as we walked.

   I went into my room and laid her on my bed.  For a few minutes, I simply
stared at her, admiring every inch of her body.  Though I had lived with
her for two months, I had never gotten the chance to truly appreciate her.
She was an adorable, plump little girl, who had one of those faces that you
just couldn't help but smile at.  She babbled softly and stared at my
ceiling as I gazed at her.  However, soon she began to whimper.  I resorted
to my usual tactics and began making faces.  This worked for a while, until
I took a sniff of the air.

   I sniffed again, inhaling it this time.

   "Oh Marissa.  Did you make a stinky in there?  Don't lie now!" I
followed the scent down to her cream colored onsie.

   "You did, didn't you!"  

   I took her into her room and set her on the changing table.  I removed her 
onsie and left her just in her Luv's diaper.  I put my nose to her diaper and 
sniffed again.

   "You dirty, dirty girl.  It's okay.  Big brother is going to make it
alllllll better." I whispered to her diapered cunt, which was radiating the
most erotic scent of her messy bum.

   I kissed her fat little calf and began to work.  I opened each tab of
her diaper and pulled it back, revealing her adorable naked body.  Her
vagina, as well as her ass, was covered in a light yellow paste.  It had a
somewhat sweet and familiar smell to it.  I took a wipe and cleaned her
butt first, wiping downwards, being careful to get each smear of poo off of
her soft, smooth body.  I continued this, lovingly cleaning off my adopted
sisters bum.  Once it was clean, I moved on to her more sensitive place. 
The place where she always smiled, when it was touched; her pussy.

   I took a wipe, and like clockwork, she smiled when she was touched.  She
had gotten a little bit of her mess in her slit, and I paid close detail to
cleaning every possible speck off her cunt.  I wanted her to be as clean as
possible.  I also loved to touch her.  I could tell that she loved the
attention, and she could tell that I loved her.  I removed her mess from
her pussy with the baby wipes until I was sure it was totally clean.  Then,
I went in with my left hand.  I placed my index finger on her right fold
and my middle finger on her left.  I gently massaged her pussy and let her
bask in the pleasure, just as I was.  She was in ecstasy, as her big
brother massaged her in her perfect place.  After all, why should I get all
the fun?

   I was on the verge of cuming right there, but I held off, I had bigger
plans.  I put the clean Luv's diaper on her and lifted her off the changing
table.  We went into the living room, where I shed my clothes, with the
exception of my boxer shorts.  I sat down on the couch and put on the kids
channel on the TV, so that she would be a little distracted while I planned
my next act.  Her focused stare of the TV reminded me of my own childhood,
watching the flashing cartoons come across the screen.  Even though she
wasn't old enough to understand it, her eyes were fixated on it, while she
reached her hands towards the TV, as if she wanted to touch the characters.
I sat her in between my lap, with one arm holding her up against my
stomach. I stared at her wisps of brown hair.  Just like her brother, Ed.
My hard penis was up against her back, which was now coated in thick, clear
pre-cum.

   We watched for a few minutes, while she babbled.  I was in total
amazement at what had just happened back in her room.  She loved the
sensation of stimulation on her girl parts, even if she didn't know why I
was doing it.

   But I was just getting started.

   While she sat in between my legs, I took my free hand and gently slipped
it into her diaper.  The elastics on her diaper stretched.  I stroked up
and down at her slit, being extra careful to make sure she was enjoying my
fingers on her privates as much as I was.  To my surprise, she did not mind
this, and mostly cooed at it.

   I laid Marissa on her back and took off her diaper.  I removed my boxers
as well.  Once again, she was naked in front of me.  I then lifted her with
both hands, and laid on my back, placing her baby pussy over my mouth.  I
knew that I couldn't wait much longer.  I was eager to pleasure the two of
us.  I put her pussy lips over my mouth and began licking, while gyrating
her in a smooth, rhythmic motion.  She began to let out warm screeches of
joy, as I flicked my tongue around her vagina.  I began putting my tongue
inside the slits, tasting her insides.

   They tasted magical!

   I was on a mission to give her the greatest moments of her life.  I
poked and prodded at her sensitive box with my tongue, using it as
instrument of pleasure.  Her soft, pink box was mine.  With my hands on her
body, she squirmed and twisted while joyously screeching.  Her womb was
swollen with stimulation.  Especially her flaps, which were now pulsating
as I pleasured her deeply.  As I licked her up and down, side to side, in
every direction possible.  I don't think there was a single part of her
tiny baby cunny that I left unlicked.  To my suprise, she began to quiet
down.  She then quivered with pleasure while letting out a gasp.  A series
of coos and happy whines followed.  It was at this moment that I came the
hardest I had ever came!

   I shot five spurts of hot, teenage jizz into the air, which landed in
her hair and on her back.  I moaned as each load of spunk expelled from my
balls.

   "Ooohh fuuuck!!!" I moaned in pleasure.

   Streaks of white cum coated her stomach, back, and hair.  She was
covered and defiled with my semen.  I knew that this warned for a bath.  I
lifted us off the couch.  Some jizz had landed on her shoulder.  She played
with it in her fingers, feeling how sticky it was.  She even took one
finger and put it in her mouth, but made a sour face afterwards.  I guess
it was an acquired taste.  She would be getting used to it though.

   I drew up a bath for her in the tub and carefully washed each inch of
her skin with warm water and baby soap.  I also was sure to clean her hair,
removing any remnants of cum from it.  No one would know that she had
experienced her first orgasm and my first with her.

   She was truly a beautiful creature.  I had no idea that such any
creation could be so amazing.  When she was clean, I dried her off with a
towel and drained the tub, before putting a fresh diaper on her.

   Satisfied and happy, we returned to my room.  I laid on my back, with
her on top of my stomach, so that she could feel me breath in and out. 
Again, I placed my fingers in her diaper and played with her cunny.  I did
this while kissing her cheek and licking her freshly cleaned neck.  We did
this, and she let out sounds of joy.  After a while, she stopped though,
and my hand began to feel...wet?

   What?

   Was she pissing?!?

   I removed my hand from her diaper for a moment and sniffed my finger...

   Yep.  That, indeed, was the sweet scent of Marrisas's urine.

   She continued to soak her diaper, leaving it jelly like.  It was as if
she had become a fire hydrant, dousing her diaper with warm, golden, baby
pee.  I could feel the diaper getting heavier on my chest.  Once I felt it
stop expanding, I placed my fingers back in and began fingering her again.
This time though, she was not as eager.

   "Oh Marissa.  You sure are full of surprises.  You're lucky you're
cute." I said to her, while she fussed over her soaping wet diaper.

   Again, I took her to the changing table and cleaned her up.  I removed
the piss soaked diaper, which was stained yellow from her release of urine.
I was rather surprised at just how heavy it was.  Perhaps all the
stimulation made her release her "wee wee."

   I proceeded to change her diaper, wiping her wet pussy and soft, round
ass.  However, this time, I did something different.  Once I was done
cleaning her, instead of putting a new diaper on her right away, I flipped
her over, on her stomach.  Staring deeply at her ass crack, I was ready to
dive into her depths again.  This time, from her other hole.

   I spread her cheeks and began licking the wall of her freshly cleaned
butthole.  She giggled at this new sensation in her asshole.

   As I licked deeper and deeper, she began to let out louder and louder
noises of pleasure, assuring me that she was loving every moment of being
inside of her.  I could feel every crease and crinkle of her butthole on my
tongue, and I was sure to paint the wall of her cute anus with my saliva.
Eventually, I reached the very deepest part of her anus, and began licking
it gently.  I continued, until I could feel another load coming from my
testicles.

   I removed my tongue from her ass, as I was on the verge of cumming!

   I grabbed my cock and jerked it a few times, cumming into the new diaper
that I had prepared for Marissa.  Flipping her back, faceup, I put the
cum-laced diaper around her recently pleasured ass and smiled, babbling and
making faces towards her.  This was a time for pleasure, but I assure you,
I later washed my mouth out with toothpaste and mouthwash.  Baby anus
tastes good, but the smell may take some aback.

   Once she had a (reasonably) clean diaper on, I placed her in her high
chair.  I opened a jar of applesauce and put spoonfuls of mushy baby food
into her moist, wet mouth.  I imagined what kind pleasures could come from
her mouth, aside from the usual quick kiss.  I plotted what to do the next
time I would get a chance to be alone with her.  Her fun had made her work
up quite the appetite, and she devoured spoonfuls of fiber filled food.  I
was eager for her next load in her diaper.  After that day, I looked
forward to her diaper changes, as they allowed a moment of private pleasure
between us, even if it were just for a few brief minutes while our
unsuspecting parents were preoccupied with other things.  I would volunteer
to change her more often, so that I could get the quick touch or rub in.

   As I finished feeding her, my parents walked in the door with various
bags full of clothes.  They also bought a few boxes of diapers for my sweet
sister.

   "How was she?" My Dad asked.

   "Good.  She's changed.  And fed.  And bathed." I said proudly.

   I was proud of my job as such a great brother, even if I did leave out
the part about pleasuring her and exchanging the greatest pleasures of our
lives.

   "Wow.  I ought to have you watch her more often." He said in
astonishment.

   "Yeah I guess so.  She's not so bad." I said, feeding her a final
spoonful of baby food.

   Over the years, the very baby that I had thought I would hate being
around, became one of the greatest and most pleasurable things to ever
happen to me.  I greatly looked forward to coming home from school so that
I could spend time with her.  We often played silly games together,
enjoying each others company.  She was not just an object for my pleasure.
She was my sister.  I gained a great, erotic pleasure out of seeing her
happiness, and every time she cried, I always wondered if it was because
she was yearning for some more secret fun with her big brother.

   
THE END

COMMENTS? E-mail "Full Diaper" at:  fulldiaper@protonmail.com
   
NOTE: More baby and toddler erotic stories like this can be found in the
      Nepi Stories Collection located at:  www.asstr.org