My Sister Wanted to see me Cum.

My sister and I have always been close, all throughout our childhood we were never shy with each other and often talked openly although not about anything sexual.
Then one day things seem to change, she was 15 I was 16, and we both came home from school to find Mum and Dad had popped out shopping.
The note they left said to help yourself to drinks will be about an hour.
We both ran upstairs to change out of our uniforms, then after returning down to the lounge with a drink and biscuit.
Both of us plonked ourselves on the sofa me one end sis the other.
She instinctively swung her legs over and dropped them on my lap.
She was dressed in just a tee shirt and me in my shorts and also a tee shirt.
She then swung her legs across my lap which she had done many times in the past.
This time though one leg was resting on my cock the other she had bent slightly.
I had a full view up to her white knickers which had a damp patch on over her pussy crease.
That set my cock off, and I instantly got a hard-on, which she felt as her leg was resting on it.
Looking at me she said” You gone hard, “ trying to hide the fact I was I just said “no“.
“ you are I can tell”. “ so what if I am”, what she said next I didn't believe, “Let me see” “What” “Let me see it” she said.
“ see what”, “Your cock, I've not seen one hard for real”.
“ your kidding right,” I said.
“ I've done sex edd so I know what you boys do with it when you get hard”
“ well I ain't showing you my cock” “ I've seen it before when we both used to bathe together, so go on let's see it”.
“ Christ sis if Mum and Dad found out they would kill us”
“ I won't say a word ok I promise”. She said.
“ hang on if I’m about to show you my cock what do I get in return”?
“ what do you want,” she asked.
“ ok you can show me your fanny fairs fair”
After some thought, she agreed. Nervously I unzipped my shorts and let my hard erect cock lose for her to see.
Her eyes opened wide in shock saying “My god bro that's huge”
“ it's not” “We'll I think so,” she said.
“ Can you cum” “What?” “Can you cum, I bet you can that's why it's hard you want to cum” she said.
“ I'm not going to cum” I said, “ go on I know you can I've heard you in your bedroom so I know you play with it”.
Wanting to put my cock away I suddenly felt even more aroused that my sister was watching my cock so intently I thought I might get something out of this if I showed her how to jerk off.
“ ok look if I show you promise this is between me and you and when I'm done I get to see you cum too that's the deal”
Looking at me in horror she said” What I have to cum as well, I'm not sure I could not here”
“ I know you also play with yourself, I've seen you with your hands in your pants a few times”.
Again her face was a picture, it seem to turn red at the thought of me catching her fingering herself.
“Is it a deal that I will jerk off in front of you if you make yourself cum as well”.
“ Christ bro that's not fair but ok it's a deal”.
Both in agreement I took hold of my stuff shaft and started to squeeze it gently then stroking it up and down, the first signs of precum not dribbling from my tip as I pumped my cock a bit harder.
Watching my sister's face she seemed transfixed on what I was doing all the while waiting intently for the results of my efforts.
I was now stroking my cock harder as I could feel the start of my orgasm building up.
“ you ready sis I'm not going to be long,”.
“This is amazing bro “ she said,”
Then I flipped my head backwards as gave out a very loud groan, my solid cock seem to stiffen even more as my load of white cum sorted upwards to land on my shorts.
It never seem to stop as more of my cum started dribbling down my shaft and over my fingers still wrapped around my cock.
“Bloody hell I didn't expect that much, does that happen all the time”.
“ Most times, it depends on how hard I am and what I'm thinking of”
In sex edd, they taught us that it's ok to touch and grossly I thought to give men blow jobs which I don't seem to ever want to try”
“ I've also read that men give girls the same so it must be part of sex I guess”.
“ I know but shaking a man's cock seems too gross to think about let alone suck it or drink his cum”
I've seen pictures of men licking a woman's private parts so I'm guessing women want them to do that as much as men want them to suck their cocks, it might sound gross but I guess it's what you do”.
Grabbing a tissue I cleaned my cum off my hands and wiped my shorts.
Turning to my sister I said” Your turn”
Again red faced she looked at me saying,
“ oh Christ yeah the deal”.
“ yeah my cum for your cum” I said.
Standing up she sheepishly lifted her tea shirt up then hooking her fingers into her hands slipped them down to the floor.
“ god knows why I agreed to this”
Sitting back down she laid back onto the sofa, I was sat at the end as she put one leg again over my lap the other drooped onto the floor.
Lifting her t-shirt I got my first glimpse of her time pink slit hooked between her legs.
“ my god this is embarrassing, “ she said.
“ you did promise so let's see how you do it”. I said.
With her legs open her pink virgin pussy on full show to me she slipped her fingers between her two tiny lips.
Closing her eyes she moved them slowly up and down the whole pussy area, quietly starting to groan she rubbed her open slit so gently that it seem to set my cock off again.
She seem to concentrate her fingers on the top of her pink open slit which made her groan even more.
Watching my sister lay there fingering herself I had to try again to jerk off as well.
She had one finger plated on the top of her opening with two others probing her opening lower down.
Her groaning seem to get louder as she plunged her fingers up into her hold.
Suddenly lifting her pelvis she seems to jam what looks like her whole hand right against her pussy.
Groaning loudly she seem to cum with more force than did the first time but while watching her I was also vigorously pumping my cock while watching my sister cumming hard next to me.
At the same time, she came I managed to shoot my second load, and we both came together which I felt was the most erotic thing I had ever done.
The sight of my sister playing with herself made my orgasm so intense than I ever thought.
Looking at her lying there, her fingers still stuck in her pussy, she turn to me to say” Well will that do”
“ my god that was fucking brilliant.”
“ did you jerk off again,” she asked.
“ I had to watch what you were doing I couldn't help it”.
“That's to hardest I've ever cum, it must be the thought of you jerking off that did it”.
“ me too, your pussy looks amazing and watching you was fantastic to watch”.

From that day onward me and my sister enjoyed some very erotic sessions together, nothing illegal but certainly we had some fun.

Look out for my next story,
Fucking Joans tired Old Pussy.