To gain a better understanding of the characters and the plot, I strongly recommend reading some earlier parts, although this should stand ok by itself.
*
I couldn't sleep. For a start I was now unused to sharing a bed and every time you moved and every small noise you made seemed to keep me more awake. But mostly it was thinking about us and what I was doing that prevented sleep.
I felt a lot of guilt and shame, but in the main was able to suppress it and had got used to living with it. What was nagging at me, mostly, was that tomorrow Janis, your mother, my sister, would arrive and the three of us would be together all the evening and night and the next day. On top of all that there was another issue troubling me. There really was just one usable bed, the one we were sharing, the one I would tell Janis I had shared with my daughter Sara and the one that tomorrow night I would share with her.
Inevitably, my thoughts went back all those years to when she and I were both teenagers; there is only thirteen months between us. We had always been close, sharing everything and doing most things together, we were as inseparable as most twins.
We had sailed through puberty and were in our late teens. Whilst neither of us was particularly promiscuous, we had numerous boy friends and by the time she was nearly twenty and I was a year younger the days of losing our virginities were dim memories.
I had just been given up by an older bloke. I came in crying. Mum and dad were away for the weekend. I went straight to my bedroom and undressed. Janis asked what was the matter? I didn't want to tell her at first, but then I did. She came in, she was in a dressing gown, and I was in my nightie, a baby doll I remember. She consoled me.
How the hell that consoling necessitated us lying on my bed I had no idea?
How helping a sister overcome being given up required me to be in her arms our bodies pressed together from head to toe, I didn't know.
How Janis' hand on my breast was supposed to be comforting, I couldn't tell.
And how her mouth closing on mine and her tongue edging past my lips, which I welcomingly opened, was part of a reassuring process I just couldn't fathom.
What I could tell, understand and fathom was that I enjoyed it. I welcomed it in fact and I started to give back as much as she gave me.
And then I could understand why we cupped each others breasts, why my baby doll slid off me and why her dressing gown was open right down the front. Yes then I did appreciate why we were both naked and my nipples were in her mouth and my hand was between my sister's legs.
That had been the start. It went on for around a year or so I suppose. It wasn't an every night, day or week event; just something we did when we both needed it. Of course we drifted apart when we both married and lived miles away, but I never stopped thinking about her and those few months when we went further and further with our bisexual sibling, incestuous love.
+++
Although I saw you in the doorway, although I saw you naked and although when you came to the bed, unlike mum, you got in and I held your tits, we didn't have sex. I don't know whether that was down to you or me, but I felt absolutely fucked and was soon asleep. I remembered nothing more until I suddenly woke up wondering where the hell I was.
As was quite usual, though, I had a hard on. The difference was that this time it was pressing against your bum and that made me aware of where I was. Your bent back was 'staring' at me. I touched it hoping I wasn't dreaming. It felt real. I slid my arms round you and cupped your breasts. God they felt good. Heavy and full, smooth and malleable. They were lovely. I squeezed and was rewarded by your body jerking slightly and by hearing a low moan as, suddenly I realised I wouldn't need to have my usual morning wank to get rid of my hard on; I could fuck you instead.
I stroked your tits and found your nipples as I pressed against you, my cock nestling into that mysterious, to me, crevice between your nicely rounded cheeks.
"Mmmmm, that's nice baby," I heard you sigh.
I decided to try it on. Why not I thought? Most of the time, quite naturally, you directed and organised things. You were the teacher and I was the pupil. You called the shots, decided when, where and how we would do it. So it seemed right that it was now my turn. My turn to lead, my turn to direct events; yes my turn to initiate a fuck with you.
I kissed your neck. I licked up and down it as with one hand I continued fondling your tits and with the other I grabbed my cock. I pushed it between your legs. It was a tight fit and I wasn't quite sure what to do. The precise geography of 'down there' was still a bit of mystery to me. I smiled, though, as you moved your legs and the tip of my cock found your slit for I was thinking 'Later I would get you to let me have a really good look at your pussy.'
+++
I lay there being fucked from behind. I didn't have to do anything, not that there was much I could do, being on my side and bent at the middle with your arms round me and your hands gripping my tits. It was gorgeous.
Before you'd got going, you had taken a bit of time getting your angle right and I'd had to help you. Once in me, though, your natural male instincts took over and you started to shag me with nice, long, deep and even thrusts.
Although it was lovely, my mind began to wander, daft bitch that I am. I glanced at the clock and saw that it was only six, but then, I remembered we hadn't been late last night. I thought ahead to the day that we would spend together and then to the evening when Janis would arrive. Shit that was going to be hell. I suddenly also realised that I hadn't seen her without her husband or my ex for many years and certainly we hadn't been alone together, as we would in bed tonight, probably since we left our parent's home.
You increased the depth and pace of your urges in me and that brought me out of my reveries.
"Oh fuck Cat, this is amazing," you grunted.
I pushed back against you. "What is baby?"
"Fucking from behind like this."
"None of your bikes rides let you do this the?"
