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I always had a thing for her, even when we were kids I had always wanted to get into her knickers but, her being my sister, I had so far managed to restrain myself, mainly due to the belief that if I made a move on her she'd go straight to mum or, even worse, dad, who I was sure would belt the living daylights out of me.
It has been always very difficult to restrain myself around her but especially hard in the last couple of years, trying to control myself in her presence had been testing when she had been less developed but had become even more arduous now that she looked so hot. Like most 18-year-old girls she wore very tight trousers that clung to her body like a second skin so that when she walked I could see every movement of her arse, leaving little to the imagination, and whenever she bent over her arse looked so tight and inviting I just wanted to rip her clothes off and fuck it there and then. Even worse were the times when she wore those really short skimpy skirts and pranced about the house or just after a shower when she just wrapped a towel around her self and I knew there was nothing else underneath. At times like these I couldn't take my eyes off her and found myself trying surreptitiously to look up her skirt or trying even harder to look up her towel, while she sat in the lounge doing her nails, hoping to catch a glimpse of her tight unfucked pussy. I'd even sit there praying for the towel to fall so I could see her beautiful tits, which were at least a double D.
I watch her now as she goes about tidying up the house for mum; she seems to have shot up this year. As she stretches to tidy up the cupboards in the kitchen I assess her, she's about 5'8", 130 pounds, 36DD/27/35, her legs are long and slim but not thin, and they are well formed and smoothly waxed, her whole body moves gracefully with the posture of a ballerina, Jenny has long thick almost jet black hair that reaches all the way down to her waist,. She is very beautiful, like our mother, with lovely green eyes above which are long dark eyelashes which are crowned with thick nicely shaped eyebrows. Her mouth is large but suits the rest of her facial features well and she has full bodied lush lips. Jenny's nose is well formed almost sculptured turning up very slightly at the end making her look especially cute. Today she is wearing an old green pleated school skirt, which since she has shot up, is now a lot shorter on her than when it was originally purchased. As she stretches up the skirt lifts and I can see most of her thighs and even an occasional glimpse of her flimsy white knickers, my heart seems to miss a beat as my cock jerks inside my trousers and I lick my lips at the though of engulfing her fresh tender virgin cunt with my mouth and savouring her hot sweet juices. I know she is still a virgin as mum and dad are so strict, she is hardly ever allowed out of the house on her own, even then she has to dress down as dad is very strict on what she wears outside the home. The school they have chosen for her is an all girl school which means her experience of boys is very limited.
We're on our own today and most of tomorrow, as mum and dad have gone to see our grandparents in Portsmouth before she goes off on holiday.
I watch her closely, she has finished with the cupboards and she moves across the room gracefully, like a gazelle, as she makes herself busy putting water in a bowel to scrub the kitchen floor. I can't help but just spy on her moving around the room, not exchanging a single word as I watch like a predator waiting for his prey to slip up so he can devour it. Her very nearness excites me as she gets down on her knees and begins scrubbing the kitchen floor tiles with the scrubbing brush. As she moves forward her skirt rises and soon I have a clear view of her panty covered arse and cunt, the thin white nylon knickers seem completely see through and cling to her mount as they are swallowed up into the groove of her cunt, I can make out some of her light coloured fine wispy pubic hairs as they protrude from the knickers. This is the last straw; my cock is now rigid and takes over my brain, my restraint, which I have struggled so hard to maintain over the years, disappears. I get down on my knees behind her and begin gently rubbing her pussy through the thin fabric of her knickers with two fingers back and forward. She tries to rise up as she protests.
"No Peter, what are you doing? Please stop, we mustn't, this isn't right we have to stop please. I've never been touched down there before, please stop."
It's too late; I couldn't stop now even if I wanted to. At this point in time my self control is completely depleted. I pay no heed to her protest and use my free hand to force her down. Her cunt is now becoming wet and sticky quickly making her knickers damp as it lubricates itself automatically as part of the primeval instinct in preparation for mating. Her self-control is slowly ebbing away and her protests are only nominal and mumbled at this stage. My nostrils soon detect the scent of her excited secretions stimulating me further as I inhale the heady scent through my nostrils; my cock is so hard it's almost ripping my trousers in its eagerness for release. I move my other hand down to her knickers and with a quick jerk manage to tear the flimsy material of her knickers apart exposing her cunt. I thrust a finger deep inside her tight moist sex, I can feel the thick sticky sap as I withdraw my finger and move it towards my mouth, the smell as it reaches my nose is intoxicating and the taste of her sweet syrupy juices, as I stick my finger in my mouth and suck on it, drives me insane with wanton lust. I push her head down so that her arse is sticking high up in the air, positioning myself behind her I can see her soft fleshed quim with the very fine pubic hair of a young girl; it looks so beautiful, soft, pink coloured folds of glistening flesh, her juices, like early morning dew resting on rose petals.
"Please stop Peter we mustn't you're my brother, this isn't right, as much as I may want this we must stop."
Her protest was half hearted and the wording she had chosen to use let me know that she wanted this, perhaps not as much as I did but she did want it, she had vocalised the fact and there was no going back now.
I bury my face in her arse my nose in the crease of her buttocks pushing at her pucker as my mouth makes contact with her hot juicy pussy for the first time.