Note: This story was dynamically reformatted for online reading convenience.
 
 part 1 can be found in the below location
/files/Authors/SleepyBeetle/My%20Girlfriends%20Sister%2
0-%20A%20spanking%20tale%20Ff%20part%201.txt

   The incredible tension that had been building as I watched Heather spank
her younger sister was quickly spent, and as we lay there in post coital
contentment I had to ask the question that had been bubbling away at the
back of my mind.

   'Heather, I have never been so turned on in my life watching what you
just did, but' I paused, 'Sarah's your sister, don't you feel bad about
what you just did?'

   Heather looked thoughtful and replied

   'I'm not sure, I think', she paused as she thought, 'I think Sarah's the
same as me, I think she likes it'

   'Really?' I replied 'She looked pretty unhappy earlier'

   'Yeah, I'm not sure about last night, but I'm sure she goads Mom into
spanking her sometimes.  She says and does things that are guaranteed to
get her a spanking, but only when we don't have visitors'

   'I think the way Mom spanks us has affected us in some way, I'm almost
tempted to push Mom as far as I can to see if she would spank me again
sometime, even at my age'

   I found this both shocking and arousing

   'Really, you'd get off on getting a spanking from your Mom?'

   'I guess I'm just a pervert!' she replied, and with that she rolled over
and fell asleep.

   The next day I woke up with events of the night before still buzzing
through my head, then padded downstairs to make Heather and myself a
coffee.

   When I entered the kitchen I saw that Sarah was already in there, just
out of the shower.  Her hair was still wet and she was dressed in an
over-sized white bath robe which was slightly open at the top exposing skin
still pink from the shower.  She half jumped out of her skin when she saw
me, and I have to confess I felt a bit odd myself after seeing her spanked
just the evening earlier.

   'Erm, Hi Matt, how are you doing' she asked me in a nervous voice 'Not
bad, you?' I replied 'Yeah, okay I guess', she nervously bit her lip and
continued

   'Listen, about last night, I'm so embarrassed!' she momentarily put her
face in her hands, then looked up and continued 'Heather shouldn't have
spanked me like that in front of you,it's not right!  Please, can you
promise me that you won't tell anyone?  I think I'd die if anyone found
out!'

   Her face was flushed bright red right down to the top of her chest with
what I thought was embarrassment, and I told her that I would keep things
secret.  She let out a big breath in relief and seemed to relax a bit, but
then tensed up again as Heather walked into the kitchen.

   'Hi Sarah' said Heather in what I was starting to know as her strict
older sister voice 'I hope you're going to be well behaved and I won't have
to smack your bottom again today'.

   Sarah gasped at the blunt way in which her sister had brought up her
humiliation of the night before, and I felt a sudden sexual thrill pass
through me at just the possibility that something might happen again.

   Sarah, looking acutely embarrassed paused for just a second as if
thinking carefully through what she would say next.

   My cock rose immediately as I heard her reply.

   'Why don't you just FUCK OFF!  You're not Mom!  I'm too old to be
treated like this!'

   This must have been the sort of thing that Heather meant when she said
that she almost asked for a spanking by saying some things, as there was
only one outcome that would result from her sudden outburst.

   'Right', said Heather in a cold no-nonsense voice.

   'Come with me into the lounge, it looks like I AM going to have to smack
your bottom again doesn't it?'

   Sarah immediately climbed down from her attitude.  Whether this was just
an act or whether she really did regret what she had said I don't know but
she started pleading 'No!  Please, I'm sorry, I don't know why I said that!
It just slipped out!  Please, not again!'

   'That's ENOUGH' replied Heather, and Matt, I think you can come with us
too.

   When we got in the lounge Heather sat down in the armchair, told me to
sit in the couch opposite and then told Sarah to stand in front of her.

   Right!' she began lecturing Sarah 'I think this spanking should be a
little bit different, turn around'.

   'What?' replied Sarah, but Heather quickly lifted her bathrobe and
slapped the side of he legs

   'Turn'

   SLAP

   'Around!'

   SLAP

   Sarah quickly turned around so that she was facing me, but with her
sister behind her.  I wasn't sure exactly what Heather was going to do, but
was sure as hell excited about it.  'Pull your bathrobe up to your waste'
Heather instructed Sarah.  This was getting good, and without her earlier
complaints Sarah complied and pulled up her bath robe up passed her cotton
white knickers and held it there waiting for whatever was coming.

   Having a teenage girl basically showing me her knickers to order was
just incredible, and as she stood there standing Heather started to spank
her hard

   SPANK!  SPANK!

   'You WILL show me respect!'

   SPANK!

   SPANK!

   with each spank Sarah's body was pushed forward slightly, and she had to
struggle to keep her balance.

   As I looked at Sarah's bright red face our eyes locked for what seemed
like an age, and as her sister continued to spank her she slightly bit her
bottom lip, and I swear wore the exact same expression as Heather did when
I was playing one of our spanking games with her.  I was becoming more and
more convinced that Sarah WAS getting off on this.

   What was also unquestionable however was that at the same time as being
turned on she was absolutely horrified at the humiliation of being spanked
in front of what was quite obviously a boy openly ogling her.

   Her face was bright red, and tears of shame were starting to well up in
her eyes when one particularly hard smack landed on her plump young
buttocks and she let go of her dressing gown which dropped back down to
cover her knees.

   'Right, this clearly isn't working is it!' said Heather in her no
nonsense voice.

   There was a pause, then 'Take it off'

   Sarah gasped, 'What!  No!  I've just got out of the shower and don't
have anything but knickers on underneath!'

   'I don't care' replied Heather 'Off NOW!'

   'Please' pleaded Sarah 'This is too much!, Mat will see me almost naked,
it's not right!'

   With that Heather stood up, and calmly reached round the front of her
younger sister and undid the belt of the dressing gown.

   'no no no' groaned Sarah as Heather opened the robe up to expose two
tiny pale breasts before removing the gown completely.

   Surprisingly Sarah didn't seem to try to cover her breasts at all but
just stood there like a rabbit caught in the headlights of a car.  Her eyes
were tight shut and I just stared at her suddenly exposed body drinking up
the sight.

   Her breasts were smaller than I had imagined, tiny plump cones with
large pale aureole and delicate looking pink nipples.  In that moment I
could barely think straight I was so turned on.  It felt bizarre to be here
with my girlfriend while looking at her sister like this and the weirdness
somehow seemed to add to the whole erotic charge of the situation.

   Heather broke the silence.

   'Now', she said in an authoritative voice 'I think you have been SO
naughty that this needs to be another bare bottom spanking'

   Sarah opened her eyes wide ' No!  Please!'

   Without saying a word Heather then quickly yanked her knickers all of
the way down to her knees.  'NO!' Sarah almost screamed as her hands
quickly darted to cover her naked pussy.

   'Move your hands now!' said Heather in her strict no-nonsense voice
before smacking her sister's now naked bottom 3 times in quick succession.

   'Please!  No!' Sarah cried, but Heather was having none of it.

   'Move them NOW and stand up straight or I WILL CANE YOU!' she replied.

   It was quite clear that Sarah had been caned in the past, and it was
also clear that the thought terrified her, so ever so slowly she started to
straighten up.

   She stood there for a couple of seconds, chest fully exposed but hands
clasped over her pussy until her sister smacked her again 'And'

   SPANK

   'YOUR'

   SPANK

   'HANDS'

   SPANK

   Finally, Sarah did as she was told and moved her hands to her sides
exposing her young smooth slit in all of its glory.

   I gasped as the perfect sight of her completely bald pussy was exposed
to my eyes.  Part of the shock was that it was bald!  I had briefly seen it
last night and it wasn't exactly bushy, but it was quite clear that she had
shaved it since then, almost as if she was expecting to show it off?

   Heather was also taken aback

   'Jesus Sarah you little slut!' she exclaimed before smacking her
sister's bottom again.

   SMACK!

   SMACK!

   'Expecting an audience were you!'

   SMACK!

   SMACK!

   Heather looked at me, and in particular the bulge in my shorts and
smiled.  'Well, I think that Matt likes seeing you too, don't you?'

   Sarah looked at my shorts and gasped before closing her eyes

   'Please Heather, that's enough, this is going too far' she said in a
trembling voice

   'I don't think so, I think this is EXACTLY what you wanted, now open
your eyes and let Matt look at you properly'

   Sarah opened her eyes and looked directly at me, her face bright red
with the shame of being stripped and displayed to a boy.  I could also see
however that Sarah was clearly very very turned on, the scarlet of her face
down as much to arousal as embarrassment and when I openly stared at her
smooth perfect slit I could see that it was glistening.

   'Now do a little turn to show him everything, I can see you like the
attention'

   She groaned, and trembling did a slow pirouette as I openly ogled her
young body 'Oh God!  this is not right!' she almost whimpered in a
trembling nervous voice.

   When she was finished Heather picked up a T Shirt that had been left to
dry on one of the heaters.

   'Right, that's quite enough of you looking at my boyfriend, now come
here'

   Sarah was confused but knew better than to argue so moved to her sister,
who moved behind her, rolled the T-shirt into a blind fold and secured it
behind her head.

   'What are you doing?' asked the scared and naked teenager.

   Heathers reply was to give her 2 hard smacks.  'Do what you are told!'

   SMACK!

   SMACK!

   'Now, I think Matt should have a turn spanking you seeing as how you
were so keen to show off to him, don't you?'

   'Oh my God, No!  Please!' she pleaded

   It was then that things started to get really weird as Heather started
to strip out of her clothes while telling me to guide her blind-folded
sister across my knees.  I started to ask what she was doing, but she just
put a finger to her lips as mimed 'sshhhh' as she continued to strip.

   I was in heaven as I laid the naked, freshly spanked and clearly aroused
teenager over my lap ready to spank her some more.

   I left her there for a few seconds until Heather was completely nude,
not knowing exactly what was going to happen next.

   I looked at my now naked girlfriend, and although I had seen her like
this hundreds of times the sight was still breathtaking.  She was plumper
than her sister, with soft b-cup breasts and more flesh on her buttocks and
thighs that gave her a much more womanly look.  Like her sister she had
shaved her pussy completely bald and the site of her pale smooth slit was
almost enough for me to lose control.

   She then went over to the armchair opposite me, opened her legs and
began playing with herself as she started to lecture her sister 'Now, you
have been a very VERY naughty girl' she said in her stern voice, 'and what
happens to naughty girls in this house?' she asked while her fingers gently
played with her clit.

   'They get spanked' said her sister in an embarrassed voice

   'Louder!' replied Heather, fingers busily rubbing herself

   'They get SPANKED!' Sarah almost shouted

   'Well Matt, spank her!'

   I moved my hand from where it was hanging and placed it onto one soft
buttock, the first feel of her young flesh, hot from the spanking her
sister had just given her sent a shot of desire through me.

   I then began the spanking, raining smack after smack on her exposed
bottom

   'Harder!  She needs a good hard smacked bottom' said Heather who
appeared to be close to climax

   'She's been a very VERY naughty girl' she continued, clearly getting off
on playing her strict Mother role while watching her sister get spanked.

   I increased the force and could see that Sarah was starting to move her
body in rhythm with the spanking, and was tilting her hips so that she was
almost thrusting her smooth vulva to me.

   'that's it, spank her naughty bottom, spank her, spank her harder' said
Heather as she brought herself to a shuddering climax.

   Heather seemed to struggle to keep from crying out as she climaxed, but
the noise of the spanking seemed to cover it up, and Sarah seemed almost on
the verge of cuming too, and as her body rocked with each spank she seemed
to be rubbing herself on me somehow.

   I paused for a second, and unbelievable Sarah seemed to keep her hips
tilted up so that her vulva was almost presented to me, asking me to touch
it.  I gently rested my hand on buttock and my finger tips just touched the
puffy lips of her pussy.

   She gasped, then Heather looked at me and shook her head 'Not like that
Matt, I think that's enough, get up Sarah'

   Her still blindfolded sister, bright red and on the verge of both crying
and orgasm got up off my lap with shaking legs and a bright red bottom.

   She then took her hand and lead her over the armchair before pushing her
down into it.

   'Right!  I can see you clearly like showing off to Matt, and are clearly
enjoying being spanked so I think you can put on a little show for Matt'
'Open your legs and play with yourself' she commanded

   Sarah gasped again, 'But, but, I can't do that in front of Matt?'

   'Do it NOW!' she commanded

   Sarah complied and opened her legs to reveal her smooth pussy in all of
its naked glory, before moving her hand down to finally bring herself to
climax.

   Heather came over to me, silently pulled my shorts and underwear down
and started to gently rub my engorged cock as I sat watching her naked
younger sister rub herself into a shuddering climax.

   It didn't take long for me to finish

   The End

   If you have any feedback, my email address is sleepybeetle@gmail.com

   My other stories can be found at
/files/Authors/SleepyBeetle/