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 From when I was 7 years old, and my sister was not yet 6, we were always
exploring each other's bodies.  My earliest memory is me and my friend
Frank from across the road getting my sister naked in our kids
cubbie-house. Basically it was version of doctors and nurses, and my friend
and I were the doctors, my sister the very willing patient.  For maybe 20
minutes, we had her naked, on her hands and knees with her ass sticking up
in the air while we stuck our fingers up her butt, and later we put other
objects in her too.

   Later in life, and up until I was 15 years old, we were always exploring
each other's bodies but almost every time it was at my sister's
instigation. I lost count of the number of times that I'd hear a subtle
knock at the bathroom door while I was in the bath, and it would be my
sister wanting to come in and to play with my cock.  I always loved these
times because I'd get to lie back while she wanked my stiffy.  And she was
just as thrilled to have my cock to wank.  After the first dozen or so
times, things progressed to me asking her to suck it for me, and after yet
another dozen bathroom wank-times, she did start to suck my cock which even
though I was too young to blow a wad, it always felt great having my cock
in her greedy mouth.  Unfortunately I was never allowed into her bathroom
times to play with her body - all this sex play as at her initiation.

   Our mother worked at a large hospital, which included very large grounds
and gardens.  On school holidays, my sister and I would often go to her
work so that we could swim in the pool all day.  We were older at this
stage, our parents having divorced when I was 11 years old.  When we walked
around the grounds and bush area, my sister and I stumbled upon a patient
in the bushes who was wanking himself.  This by itself was no big deal, and
we left the guy to his fun.

   But it seemed to flick a switch on within my sister, and when we were in
the pool a short while later, we would take turns diving between each
other's legs and while we each did so we would spend as much time as
holding our breaths allowed to rub each other's crutches.  She'd slide her
hand up the leg of my shorts to squeeze my hard cock, and I'd rub my
fingertips along her cunt entrance pushing her bikini pants into her cunt.
We must have done it to each other more than a hundred times, and it was
great.  Then later when in the deep end and about to climb out of the pool
via the steps, against my sisters protest I got my hand inside her bra top
and played with her tits for several minutes.  All the while she was
protesting, but more about the chance of being seen than by the fact I was
grabbing a handful of her tits.  My response was to tell her to stay under
the water, and that our bodies concealed what we were doing.  Even though
she continued mild protests, in fact she let me do what I wanted for maybe
5 minutes before we did finally get out of the pool.

   When it was just my sister and I in the home alone, she was never fully
dressed.  Always at most only wearing bra and panties, she would make quite
a display of say ironing her clothes in the lounge room where I could stare
at her almost naked the whole time.  I was never allowed to touch her at
these times - her game was always to tease me with her near-naked view.

   On one occasion, our youngest sister was also at home, and the 3 of us
sat on the same sofa watching TV.  And while the youngest sister continued
watching TV, my sexy sister on the other side started to tease and tickle
me.  Each time this would result in a wrestling match and with me being
stronger I'd always win the tussle.  On the last occasion of wrestling, I
worked my hand into her bra and grabbed a handful of her tit, which she
allowed me to do by not resisting that hand at all.  After 2-3 minutes of
me feeling up her tit and pinching her nipple, she playfully bit me to end
that wrestle, and back to 3 kids on the sofa we went.

   I then had my arms crossed, and with my left hand under my right arm, I
carefully started to pull her blouse out of her skirt which she made no
move to resist.  After gaining access under her blouse, I carefully snuck
my hand up to the level of her bra, and I pushed it off and up over her
tits, again she made no move to stop my wandering hand and she let me have
free access to her left tit and nipple.  When I had my target in my hand, I
then worked her nipples for a few minutes, gently pinching and pulling on
it.  I could hear her breathing was slightly labored as my nipple play was
getting to her and the whole time she let me do what I wanted to her.

   thinking to try my luck at how far I could go, I then slowly moved my
hand down her stomach very carefully because our younger sister was still
sitting unaware to my left the whole time.  When I got to the waistline of
her skirt, my fingers searched for the top button and I popped it open - my
hand always concealed by being inside my sister's blouse.  After getting
the button undone, the zipper at the front of her skirt was easy to deal
with and finally my hand was inside the top of her panties.  At about this
time my sister un-crossed her legs and opened them a little to give me
better access to her cunt.  The first thing that surprised me was that even
at 13 years old, my sister had a very hairy snatch.  The second thing I
noticed was just how wet she was, she was dripping.

   Anyway, with my fingers sliding up and down the outside of her cunt, her
wetness making it so easy to slide in and around her clit, my sister made
the most subtle moves to pump up and down on my fingers - we both being
super horny but also intensely aware that our younger sister was just
sitting inches from my other side.

   And then I can't explain it - I guess I got a serious case of the
nerves, because my whole body started to shake like I was freezing cold.  I
certainly wasn't cold, but my shaking got so strong that I had to stop
fingering my sister's soaking wet cunt and leave the room.  When in the
kitchen, I called for my sister, but she knew where this would end up
going, and she refused to come into see me.

   Our mother was a total slut.  After our father moved out, mom went cock
crazy and was fucking different guys all the time.  My room was the
closest, and with paper-thin walls I got to hear every gasp, groan and
breath when mom was fucking some new guy.  Sometimes these occasions would
get me so horny that I'd sneak into my sister's room for a bit of fun and
games, but she'd yelled out in no uncertain terms that I was not welcome.
In all the hundreds of times my sister and I had sex fun, it was always
when she wanted it and she that made the first move.  Not that I am
complaining, but it would have been cool to have access to her body when I
wanted to start it.