My Sister made me Cum. (Edited)

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 seemed to change. She was 15, I was 16. We both came home from school to find Mum and Dad had popped out shopping.
The note they left said to help yourself to drinksand a snack; we would be about an hour.
We both ran upstairs to change out of our school clothes, then returned down to the lounge with a drink and biscuit.
Both of us plonked ourselves on the sofa, me on one end, sis on the other.
She instinctively swung her legs over and dropped them on my lap.
She was dressed in just a tee shirt, and I in my shorts and also a tee shirt.
With her legs across my lap, which she had done many times in the past.
One leg was resting on my cock, the other she had bent slightly.
As she was only in her tee shirt, I had a full view up to her white school knickers, which from what I could tell had a damp patch on over her pussy crease.
The sight of her knickers and how damp they seemed to look
It set my cock off, and I instantly got a hard-on, which she didn’t fail to notice as her legs were resting on top of it.
“Hey, you got gone hard,” trying to hide the fact I was. I just said, “No“.
“You have, 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”.
“You’re 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”. She begged.
“Christ, sis, if Mum and Dad found out, they would kill us.”
“ I won't say a word, okay, I promise”. She said.
“No, we could get into so much trouble if they found out”.
“ I won’t say a word, okay, go on just a peek at it,” she again begged.
“No, now stop asking,” that’s when I noticed a damp patch on my shorts,” you’re leaking” she said.
“So what if I am?”
“Please go on, I won’t laugh,” she said.
By now my tiny cock was so hard you couldn’t help notice it bulging in my pants.
“ Christ sis, we can’t,” I said.
“Tell you what then, you show me your cock, I will let you touch me,” she said.
“See you wear,” I asked.
“You know down there,”
“What’s your knickers?” I said.
“Yeah, I will let you see it,”
“What see it for real?”
“Yep, all of it,” she said.
At just the thought of getting to see what my sister had in her knickers I readily agreed to what she was asking me to do.
Again looking around just in case my parents were going to walk in I slipped my shorts down, letting loose my hard cock.
“ Christ this really big, does it get that big all the time?” she asked.
“Sometimes just depends on what I’m thinking about,” I said.
“ Can you cum?” “What?” “Can you cum? I bet you can. That’s why it's hard. You want to cum,” she said.
“How do you know what cum is?” I asked.
I’ve done sex edd at school we know what cum is and how boys do it, it’s called masturbation.
“Yeah I know what that is,” I said.
“Do you masterbate,” “How can you ask me that,” I said.
“You do I know you do I've heard you.”
“ I might do,” “Can you make it cum?” she said.
“ I'm not going to cum for you,” 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 knew this was wrong in what we were doing, but my cock was now getting so hard it felt uncomfortable.
“Please, if you can cum, I might let you touch my fanny and rub it,”
“Oh god stop it, you’re making things worse,” I said.

She looked straight at me then at my stiff cock, I wanted to cum so much, just the thought of touching her fanny made me want to more than ever.
“ ok look. If I show you, promise this is between you and me, and Mum and Dad never find out then ok, it’s a deal” I said.
Both in agreement, I took hold of my young, stiff cock and started to squeeze it gently. Then, stroking it up and down, I could feel myself building to an orgasm.
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 as hard as I could, feeling the start of myself wanting to cum.
It took a while, but eventually, I said, “ You ready, sis? I'm not going to be long.”
“This is amazing,” she said.
Then it happened. I seemed to jerk on my solid cock, and it seemed to stiffen even more as this load of white cum spurted upwards, splattering all over my shorts, then dribbling down over my fingers.
“Bloody hell, I didn't expect that much. Does that happen all the time?” she said.
“ Most times, it depends on how hard I am and what I'm thinking of.”
In sex edd, they taught us that it's okay to touch and, grossly, I thought to give men blow jobs, sucking that stuff which I don't seem to ever want to try.” she said.
“ I've also read that men give girls the same, so it must be part of sex, I guess.”
“ I know, but sucking on a man's cock is too gross to think about, let alone suck it or drink that stuff,” she said.
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 Fanny,” I said.
Standing up, she sheepishly lifted her tea shirt up, then, hooking her fingers into her knickers, she 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 tucked between her legs.
“ my god this is embarrassing,” she said.
“You did promise, so let's see it then.”
Sitting back onto the sofa, she lifted her legs up for the first time. I could see my sister’s tiny pink hairless slit, tucked between her soft white legs.
Something I probably would never see if she hadn’t made a deal with me.
“Right as promised, you can touch it, but don’t stick your fingers in,” she said.
At first, all I could see was her Fanny crease. It was when she opened her legs that things changed.
That tiny young pink slit opened up to reveal her Fanny Yao me in all its glory.
I could see her little clit tucked at the top with her very small virgin hole open wide just underneath.
“ god sis, that looks amazing,” I said.
Lifting her head up, she looked down. “You think so?”
“Yeah, I do. Can I touch it?” I said. “Yes, but be very gentle, I get very sensitive down there.”
I nervously leaned in between her young legs, and with my finger, I just rubbed her little clit. She gave out a gasp. “ god just take it steady,ok” Not wanting to rush things, I continued to just rub my finger over her little clit, each pass causing her to flinch and twitch her body.
“Is that ok,” I asked.
“Yes, that’s fine. Just rub a bit harder, will you?” “Oh,” I said.
“Still don’t push too hard, but just push your finger a little harder.”
All I could do was what she asked, so I pressed against her clit a bit more firmly when she suddenly twitched hard on my hand.
“ Jesus Christ, just hold it there, don’t you dare move,” she cried.
Feeling her legs jerk up, my hand just pushed against her Fanny. She groaned out loud.
It was then she reached down with her own hand, gripping my finger, she pushed it into her tiny hole.
“You said not to go inside,” I said.
“Shut up, will you? I’m cumming,” she said.
It was then I felt it. My finger pushed inside her tiny hole. I could feel her Fanny pulsing as she groaned out loud.
Her young body lifting and twitching as her orgasm pulled through her whole body.after a minute or so, she laid back down, pulling my finger from her Fanny she looked at me saying.
“ bloody hell, what the fuck” “ what’s wrong, did I do something I shouldn’t of,” I said.
“ no you didn’t, you made me cum on your bloody finger,”
“ I could feel it,” I said.
“ I’ve never ever had one that intense before,”.
“ well to be honest you felt amazing,” I said.
“ I know one thing if that’s how there going to be you can bloody do that again,” She said with the biggest smile on her face.
She just laid there, her legs still wide open, as we both looked at each other.
“ well sis you’ve seen me cum, I’ve made you cum, not something I thought we would be doing.
“ I know, we best not tell anyone ok,” she said.
Standing up she slipped her knickers back on, me I tucked my wet cock inside my shorts, just as our parents came home.
That night my sister sent me a message saying,” I know we shouldn’t of done that, and I didn’t think it would turn out like it did, but if we ever get the chance again you reckon you or we could maybe have another go,” she put.
In shock at first at what she had put I replied.
“ sis, with what you allowed me to do to you and how you look naked if I ever get chance to feel what I felt yeah why not.” I put.
From then on my relationship with my sister changed, we became closer than ever in more ways than one.
We never had sex just played with each other for our own gratification.

More to come about these two another time.