Note: This story was dynamically reformatted for online reading convenience.
 
 My Sister's Ass Author: MindInGutter Cat: Incest/Underage Warning: This
story contains sexual situations that are highly illegal in most societies.
This story is a work of fiction, written with the express purpose of
venting certain urges the author has.  The author in no way shape or form
condones anyone trying this in real life.  Keep your fantasies as
fantasies. Happy cumming! 
*************************************************************

   My hand flew up and down my thick hard cock.  I felt my balls tighten up
as the cum pumped out of me, arcing through the air before landing wetly on
the big sexy ass bared before me.

   "Mmmmm damn Danny, you always cum so much when you do this" She said to
me.  My hand was slowing down, still stroking as the last of my cum
dribbled out and landed next to the rest of my load.

   "Thanks sis, I really needed that." I replied as I leaned over and gave
Amber a very unbrotherly kiss.

   Let me tell you how it happened.  How I started cumming on my big
sister's ass.  I'm 15 now, but the first time I was just 12 years old. 
Amber is 19 and sexy as fuck.  She's got this long dark hair, her eyes are
a gorgeous shade of green blue that are just mesmerizing to me.  She's not
stacked in the chest, but her B cup tits make me drool every time she lets
me see a little more than most people.  What really makes Amber sexy
though, is her amazing ass.  She's what people call a PAWG.  A Phat Ass
White Girl.  Ever since she hit her teen years her ass as become bigger,
but ever more sexy.

   I hadn't noticed just how sexy her ass was until I happened to come home
one day when Amber was working out in the living room.  I'd been out
playing basketball and was feeling pretty good as I'd scored the game
winning bucket.  As I came into the house I dropped my gear by the door and
stripped my stinking shirt off.  That was when I saw her, bent over at the
waist, doing some silly exercise that caused her to bounce her front down
towards the floor, not that I could see that.  All I saw was her glorious
ass, clad in skin tight black shorts kind of like what girls volleyball
players wear.

   Instantly my 12 year old pecker was standing up begging for attention. I
stood there for I don't know how long, staring at her ass as my dick made a
very obvious tent in my shorts.  Amber apparently noticed me checking her
out.

   "Like what you see Danny?" She stood up but struck a pose that really
stuck her ass out at me.  I couldn't even talk, it was like my mouth was
dry, my tongue was to big for my mouth and my brain couldn't make the damn
thing work.  "Hahaha, I guess you do like what you see" she said with an
obvious glance down my front.  It was then that I realized just how hard my
dick was and that my sister could see just what effect she had on me.  I
crumpled up my shirt in front of me and made some stupid excuse as I bolted
to my room, my face flushed with embarrassment.

   I got my door close and just stood there, stunned.  Finally a couple
minutes later I got myself under control.  I tossed the shirt into my dirty
clothes pile and shucked out of the rest of my clothes, I had a little
harder time than usual getting out of my boxers, I stared at my hard dick
and thought to myself, 'what are you stupid?  She's my sister dammit!'.

   I toweled off the last of the sweat from the game and maybe some was
from my nervous embarrassment from early.  Laid on the bed and tried not to
think about Amber's ass as my hand found my still hard prick and began
jerking.

   No matter how I tried, and I did, my mind kept seeing Amber's ass, every
curve, every cleft outlined in those amazing shorts.  I had even seen that
she had a dimple in her left ass cheek.  My hand was a blur as I stroked,
but it wasn't enough, I needed more, I was fucking my fist as fast I could
and I was rapidly getting closer to cumming.  The whole time I was moaning
softly, or so I thought, in time with my thrusting into my hand.

   Just as I reached the apex of my pleasure, my cum shooting high into the
air only to fall back down splattering my chest and stomach, my door
creaked open and my sister was standing there with a smirk on her pretty
face.  "Holy shit Danny, that sounded like a great cum." She chuckled as
she stood there gazing at me.

   I tried to cover up but I was naked, on top of my covers and I could
hardly move after the tremendous orgasm that had ripped through my young
body.  I could only cover my 5 inch hard on, and yes I was still hard, and
my balls.

   Amber walked in like it was totally normal, smiling that mischevious
smile and never taking her eyes off where my hands were covering.  "You
know, I really need to thank Sara for that workout dvd, if I could get that
kind of reaction out of my little brother, I should be able to get any guy
I want."

   My breath was coming back, slowly and I was able to start moving and
complaining about not getting any privacy and blah blah blah.  Amber didn't
care, just sat on my bed staring as I grabbed a clean pair of boxers and
pulled them on.

   "Ya know Danny, if you keep doing that you'll go blind," Her eyes
twinkled in mirth and I was even more embarrassed.

   "Why are you even in here Amb?"

   "I saw that you got hard from seeing me and I thought that if you can
get horny by seeing me, I should get to see you so I can be horny too."

   I opened my mouth halfway through and that was as far as I got.  I sat
there, still trying to hide my erection, my jaw hanging open and completely
unable to think of anything to say.  I mean, how often does a guy's sexy
big sister tell you she wants to check you out so she can get horny?

   "If you don't keep your mouth shut something'll fly in silly." Putting
action to words she reached out took my chin in her hand and leaned
forward, kissing me in a none to chaste way.  I definitely felt her tongue
slip against mine for the barest fraction of a second.  Short it may have
been, but time seemed to stop during that kiss.  Every nuance, every flavor
was magnified and filled me with some indefinable something, suddenly I was
more at ease with Amber, unconcerned that she caught me asturbating,
uncaring that I was still nearly naked and the remnants of my cum where
drying on my stomach.

   Finally, after what seemed an eternity, time began to move again.  The
kiss ended and Amber leaned back, her lips curled up in a sexy smirk. 
"That....was amazing Amber," I managed to say even though I was half
breathless.  "What the heck's got into you anyway?"

   The smile faded from her face and she looked almost crestfallen.  "I
don't know, Danny," she replied.  "I asked Jason out last week and the
asshole laughed at me and told me I wasn't pretty enough to go out with
him. I've been feeling pretty down and then when I saw that you got hard
from seeing my butt, well, it made me feel really good."

   "Amber, you're one of the sexiest girls I've ever met, Jason's an ass
and an idiot if he can't see that." I blurted out.  "All of my friends tell
me how much they want to....to do things with you."

   The smile was back, "Things huh?  What kind of things we talking about?"

   Stammering again, "'uh, you know, things like....well, that kiss you
just gave me and...more."

   She giggled and the sound was music to my ears."That was a good kiss
wasn't it?  Play your cards right little brother and you'll get lots more
and better kisses throughout your life."

   "You'll kiss me like that again?!?  What do I have to do?" I asked
excitedly.

   "Whoa Danny, slow down, I shouldn't have kissed you like that even once,
you're my brother, remember?"

   "I know, but I still liked it" I defended myself.

   "I liked it too" Amber said, almost shyly.  "Tell you what, you tell me
what you think is sexy about me and if I like what I hear you'll get a
reward, and it could be another kiss."

   How do you tell your sister how sexy she is?  How do you say that
without sounding like a little pervert?  I'll tell you what I told Amber, I
told her the truth, pure and simple and damn the consequences, not that I
was thinking about that, my dick was still hard, the memory of Amber's soft
warm lips meeting mine was still so fresh I could practically still feel
them there.

   "Amber, you're the sexiest big sister I could ever want, you have the
most beautiful eyes and your smile lights up the room and makes everyone
happy, you've got like the perfect boobs that fit your body and your butt
is just amazing, I mean just seeing it before made me so horny I had to
come here and do this," I ran my hand down to my stomach and rubbed the
cold cum into my skin.  "You're so sexy to me Amber, I wish I wasn't your
brother so I could be the one that could fuck you."

   "Danny!  You're not supposed to know what that means let alone say it.
You're lucky mom and dad didn't hear you say that, you'd be grounded for
life." She scolded me, then with a gleam in her eye she smiled again and
said, "Thanks, a girl likes to know she looks good, even if it's just
coming from her kid brother."

   "Any time you need to hear that you're sexy Amb, just come to me, if I
can't prove it with words I can sure do so with him," I pointed at my
crotch.

   "Wow that thing is still hard?!  Does it ever go down?" Amber was openly
starting at my tented boxers now.

   "It usually does, but I don't usually have you sitting here looking
amazing and making me think things I shouldn't be thinking" I told her.

   "Mmmm, what things are you thinking about?"

   "Um, I'm thinking about how much I want to, ah, cum on your ass" Again
with the damned nervous stammer.

   Amber looked shocked, I didn't know what to think, had I said too much,
had I made her think I was just another pervert boy?

   "You'd really do that?  Jerk off and cum on my ass?"

   I gulped audibly, I was scared to answer but after all that we'd talked
about today, I hoped she wouldn't be mad at me, "I'd love to do that, even
if it's just one time and never again, it'd be something I'd think about
forever."

   "I'll think about it, in the mean time, you look like you still need to
cum again, why not pull it out get on with it?"

   "I'd like to but, well, you're here and all..."

   "So let me get this straight?  You just recently jerked off thinking
about me, you admitted you'd love to cum on my ass but I'm not allowed to
be here when you do?  How the hell do you think that's going to work?" She
laughed again.

   "Ok, ok, point taken.  Are you sure you won't freak out and tell mom I
started jacking off while we were talking?  I don't want her to think I'm a
creepy perv."

   "I promise, in fact, why don't we seal the deal with another of those
kisses?"

   I eagerly agreed and leaned forward making the typical kid type smooch
face.  Next thing I knew, Amber was cracking up, laughing almost
hysterically.  "What's so funny?"

   "Your face silly, I think I'm going to have to teach you to kiss, if you
ever try to kiss a girl with that face, she's going to run away as fast as
she can!"

   "I can't help it, I've never kissed a girl before!"

   "Lies!  Not ten minutes ago we kissed and it was nice," she said, still
chuckling.

   I realized she was right and thought about how I had reacted when her
lips touched mine.  "You're right, Amb, I didn't have a chance to think
about kissing you that first time, though."

   "I have an idea, why don't you lay down with your head in my lap, close
your eyes, pull out your dick and start stroking it and at some time when
you're doing that I'll kiss you again and we can just enjoy it, ok?"

   I was still embarrassed about masturbating in front of Amber, but Amb is
smart and this was a good idea, so I agreed readily.  Amber moved up
towards my pillows and crossed her legs, those skin tight shorts really
showed off a lot more than they should.  I tried no to think about the fact
that my head would be just inches from her pussy.

   I lay back and looked up at my big sister.  The first thing I saw was
the underside of her boobs, held in place by her tight tshirt, I could
easily make out the outline of her bra.  Amber smiled down and me then
reminded me that my eye's needed to be closed, so, I closed them.  I tugged
down my boxers and freed my straining prick.

   "Mmmm, Danny, your dick is very sexy, not big yet but it will be soon",
she whispered.  Her voice had an unexpected on me, my dick felt like it hot
even bigger and I realized I liked having Amber think my dick is sexy.

   In my mind's eye, I pictured Amber as I first saw her, so short a time
ago.  Bent over, her butt high in the air.  My dick was still slightly
slick with my earlier cum.  It felt good, better than normal and it was
definitely much more exciting knowing that Amber was watching me.

   The moans of pleasure were escaping from me again.  I was so into the
pleasure that I barely noticed Amber's hands gently start rubbing my chest.
I felt her move slightly and suddenly, her lips were upon mine again.  I
opened my mouth slightly and felt her tongue licking my lips, teasingly
running across my teeth before dancing invitingly against my tongue.

   I forgot I was masturbating.  All of my attention was pulled into the
feel of kissing my sister.  Amber pulled back slightly, her tongue leaving
my mouth and I was at a loss for a moment before I decided to give chase.
Not letting the kiss end, I reached up with my free hand and gently placed
it at the back of her head, I pulled her down as I reached up, my tongue
slipping between her lips and tasting her mouth from the inside.  I was
lost in that kiss until the lack of air forced me to pull away, gasping.

   "Wow Danny, you're a quick learner," She whispered, slightly breathless
herself.  "God that kiss was so intense I'm soaked."

   Amber pushed my head out of her lap and started to stand up, I panicked,
thinking she was leaving.  "Don't go Amb!" I pleaded.

   Amber walked to the door, clicked the lock and turned around.  "I'm not
leaving yet, just making sure we don't get interrupted." With that she
turned around and stripped off those amazing shorts, her glorious ass was
revealed inch by mesmerizing inch.  I suddenly remembered to start jerking
off again.

   As Amber stepped out of her shorts I could see her pussy for just a
moment, even in the dim light of my room, I could still tell she wasn't
lying when she said she was wet.  As she turned around her hand went to her
pussy, hiding it from my sight.

   "My turn to have some fun too, god I'm so hot right now" she said as she
sat down on the bed beside me.  "You can watch if you want to, but you have
to tell me when you're about to cum, got it?"

   "Ok Amb," I replied, trying to force my hand to stroke slower.  I
watched as Amber's fingers rubbed her pussy for moment before pulling away,
she was so wet she had a string of moisture connecting her fingers to her
pussy.

   "Mmmm this is so fucking good," she said softly.  She returned her hand
to her pussy and I watched as two fingers slit deep into her hole.  I
watched fascinated as she played with herself.  Her free hand slid up under
her shirt and bra and I could tell she was pinching her nipples one by one.


   I groaned aloud, the sight of her teasing herself coupled with the
feelings coming from having my hand wrapped around myself was driving me
closer and closer to the edge of cumming.  I knew I couldn't last much
longer so I switched to my stupid hand in the hope that it would help me
last longer.

   "I want to see you cum Amb!" I said excitedly.  "How close are you?"

   "I can feel it building already, fuck, I'm so horny if you weren't my
brother I'd be riding that cock right now."

   "This cock is your sis, anytime you want it, however you want it."

   "Do not tell me that when I'm this horny, I'm barely keeping myself in
check right now and it's mostly because I'm fertile right now."

   I didn't understand what she meant and asked her, "What's fertile and
why is that something to make you not want to fuck?"

   "Your dick may be plenty big enough, but you've got a lot to learn kid,"
she giggled.  "That means that if any of your cum got into my pussy I could
get pregnant with your .....  OH FUCK!!!!  OMG I'm cummmminngg!!!!!"

   "Holy shit Amb, are you alright?" She'd collapsed backward and fallen
off my bed as she came, now she lay on the floor catching her breath and
smiling the most beautiful smile I'd ever seen.

   "I'm good, Danny, oh god, that was the best cum I've ever had, it just
kind of snuck up on me when I thought about you fucking a baby into me,"
She lay there enjoying the afterglow of a really good cum and I felt my own
cum building up.

   "Uh, sis, you wanted to know when I was about to cum, I'm almost there."

   Amber sat up quickly and stared at my dick as I jerked it.  "Quick come
over here," she said and rolled over so that her ass was up in the air. 
"Come on my ass, Danny."

   She didn't have to ask me twice, I got behind her and put a hand on her
back to steady myself as I stroked harder and harder.  Finally, the peak of
the pleasure hit me and I shot four or five strong spurts of cum out
letting it fly randomly out to splatter on Amber's ass.  As the last of my
cum dribbled from the tip of my dick, I lost my balance and fell forward,
landing not completely on Amber but I could feel my cock resting between
the cheeks of her ass and the wet that pressed into my lower body that was
my cum on her ass.

   We lay there like that for a moment before Amber finally poked me.

   "Off, you're heavier than you look kiddo."

   I lifted myself off of her but before I pulled away completely I kissed
her back a few times and gave her ass several extra pecks, ignoring the
fact that I was getting my cum on my lips.

   Amber giggled some more and finally rolled over, she had her legs
crossed so I couldn't see any of her pussy anymore, but she was looking at
my crotch again, "Geez it's amazing." I glanced at my dick and saw that it
was not fully hard but definitely not limp either.

   "Despite the fact that it looks almost ready to go again, I need a break
sis."

   "Mhmmm, me too, though I have to admit..." she said.  "I can't wait til
we do that again"

   Suddenly my dick was fully hard again.

   Back to the present, it's been three years, we still haven't fucked, but
at least twice a week we masturbate together and Amb loves it when I cum on
her ass.

   We've kept a pretty normal life going outside of our masturbation
sessions.  She's dating a guy she met in college, he's pretty cool they. 
I've had a couple of girl friends but I'm currently single, none of the
girls I dated ever complained about my kissing ability, thanks to my big
sis, I had all the practice I could get.  All in all, life is good.

   Thanks for reading, I hope you had a good time and I welcome all
comments, complaints and anything else you'd like to talk about.  You can
contact me at mindingutter@mail.com