All persons engaged in sexual activity in this story, are over 18 years of age.
This story took place in the 1970s in the United Kingdom when the 'World Wide Web' or Internet as it is known today, was barely an infant and not available to private individuals. As for mobile phones, they were only at an experimental stage. This meant that knowledge of sex was gleaned mostly by chats with 'experienced' friends or looking at adult magazines aka Playboy, Penthouse, Hustler and so on.
Boys and girls were nowhere near as mature or knowledgeable about sex at age 18 compared to many of today's 14 or 15 year olds, thanks mainly to the multitude of internet 'information' that can now be accessed by anyone that can type 'sex' into a search engine.
All of this is to set the scene for you, to make you aware that in the 1970s, unlike the present, many boys and girls at age 18 were considerably naïve when it came to real sexual encounters.
Obviously, if you have read the previous chapters you will be more in tune with the characters.
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What we had felt about each other when we finally went 'all the way', must have shown in our demeanour over the next week, as Mom kept giving us odd looks of puzzlement. Whether it was the fleeting looks we gave one another, or just our closer relationship, I don't know, but she knew something was going on.
Sue and I continued to do our chores as normal, including clearing the table after the evening meal and washing the dishes. It gave us a short time together to discuss things in quiet voices, while our parents were watching the TV in the living room. We knew that they habitually watched the whole of the News and had hardly ever come back into the kitchen until it had finished.
I normally stood sideways right next to my sister and did the drying, while she washed things. I could also keep an eye out towards the kitchen door and talk quietly, directly into her ear.
It had become our custom over the last few days, that she would let me put my hand that was nearest the sink and couldn't be seen by anyone entering the kitchen, under her short skirt, and gently massage her mound, while she started the washing-up. My other hand held a large dish cloth for drying, and this shielded us further. I couldn't put my hand down the front of her panties, as it would have been too difficult to remove quickly, pick up a dish, and start to dry it, should anyone approach the kitchen.
Tonight, she had on some slightly looser panties and I had been able to slip my finger under the leg hole, so that I was actually sliding it up and down between her damp pussy lips. I managed to get into a position where I could penetrate her with my finger, and was now gently finger fucking her, albeit with only a small length of my finger.
"Do you like what I'm doing Sue?" I whispered.
"Yeah," she said, as she breathed out, "I do, but keep a good look out, they are only through that door."
"Does it make you feel even more randy knowing that?" I asked.
"Oh yeah, much, but keep watching."
She had stopped washing the dishes and was sort of shuffling her legs against one another.
"I guess we'd better get going with the dish washing, or they are going to get suspicious," she said, very quietly.
I knew she was right, so I reluctantly withdrew my finger from her warm, wet, pussy and my hand from under her skirt.
She went back to washing things up. I dried them, and we were quiet, having our own thoughts for a few minutes.
"We are going to have to keep our distance for a while when they are about," I whispered, "have you seen the looks Mom has been giving us?"
"Yeah, I know, she even asked me if everything was ok between you and me, yesterday."
"What did you say?" I asked, worried.
"I just said everything was fine, and then she said we seemed to be getting on well together. Has she said anything to you?"
"No, not yet." I paused. "I think we need to make sure we have the same story ready though, don't you?"
"Hmmm, well, yes, we'll just tell her that we're no longer virgins, you filled me with your stuff, and can I go on the pill?" she said, grinning, but in a voice so quiet that I could only just hear it.
"Sue, don't joke, it's not funny. Dad's ok, he doesn't notice anything, but Mom has a nose like a bloodhound for anything out of the ordinary," I whispered back.
"Ok, sorry... look, if she says anything else, or asks, how about we say... in our own words though...that we realized we have been a 'pain in the arse'...no, better not say 'arse', 'pain in the neck', arguing about stuff. We say we had a serious chat last weekend when they went to grandma's, and we agreed now that we are adults, we should be more considerate and make more effort to be friends...or something like that. What do you think?"
I thought about it for a moment while I dried a couple of plates.
"Yea, I think that sounds ok, just don't overdo it and I think it will work." I agreed.
"Right then," she said, in a loud voice, "I think I've 'finished'," she smirked at me, then whispered, "the dishes anyway."
I grinned; she knew how to lighten the atmosphere all right.
Sue went off to her room and I made my way into the living room to see what they were watching tonight on TV.
********************
We did as we had agreed, and apart from a bit of intimate fumbling in the evening in the kitchen, we kept a friendly distance for a week and didn't give Mom any reason to ask about our behaviour. Grandma had recovered from whatever had been wrong with her, so they hadn't visited her last weekend and consequently we hadn't had any opportunity to be alone together.
Tuesday evening, just as we were finishing up in the kitchen, Sue was looking a bit pensive.
"Are you ok?" I whispered, "you seem deep in thought."
"Errr, yeah, I'm fine. I was just thinking we haven't been able to spend much time together since...well you know..."
"Yea I know, it's awkward isn't it."
"Would you want to?" she asked.
"Want to what?"
"You know, 'spend some more time together'...like we have done."
"Of course, but you know what it's like, there is always someone around when we are both free."
"Well, I was thinking..."
"What?"
"You know I have Wednesday afternoons off from work, is there any chance you could be here too?"
"You mean skip college?"
"Only if you want to."
I thought about it. She was clearly wanting to do some more with me, and I had been using all the images I could remember to wank over during the last week or so. A chance to perhaps be naked with my sister again and try something else, was a very exciting thought.
"I suppose... I could start feeling unwell in the morning and then come home 'sick' at lunchtime. I've a good sick record, so they won't think I am just bunking off."
"So, will you?" she asked, biting her bottom lip in that way she has.
"Ok, I'll try it, but I can only get away with it once."
"I'll come down to your shed after I get home then, if that's ok?"
"Yeah, safer than in the house I think," I said.
"Great, see you there," she whispered, and after checking no one was about, kissed me lightly on the lips and went off to her room.
Wow, I thought, my sexy sister wants to do something more. My cock was already half erect at the thought and instead of going into the living room, I had to go quietly up to my room and fill a tissue with my cum, to make it go down.
********************
On Wednesday morning in college, I was preoccupied with thinking about my sister, all the things we had done and imagining what we might be going to do. One of the staff noticed that I was behaving in an unusual manner, as normally I was very attentive and due to that, I had no difficulty explaining that I didn't feel well and needed to go home.
As expected, there was no one in when I arrived home at around a quarter to one. I had bought a sandwich from a baker's shop near the college, as I didn't want there to be any evidence of missing food, that might indicate I hadn't been at college in the afternoon. I took it down to my shed and made myself comfortable, munching the sandwich as I skimmed through one of the magazines I had hidden there. The weather had turned warm again, and I had gone to college in shorts and a short-sleeved shirt.
It was almost two fifteen before I heard a 'tap, tap' on the door of the shed - I had remembered to lock it this time - when I opened it, Sue slid in quickly and I shut and bolted the door again.
"I wondered if you had changed your mind," I said, "you are later than I thought you might be."
"Oh sorry, I should have said a time, I got something to eat, then had a shower and changed, to get rid of the salon smells that linger in my hair and clothes." she replied.
I could smell the shampoo in her newly washed hair, and she was wearing her short, red, miniskirt, that showed off her long slim legs. She had on a loose-fitting, white, tee shirt and I couldn't detect a bra just by looking.
"Wow, you look great," I said, looking her up and down, "give us a twirl."
She duly spun around one turn, her little skirt flaring outwards, and showing even more leg.
"Glad you like it," she said, shyly.
Every time we had met alone, there had been an awkward silence, where neither of us knew what to say or do next to start anything, and this time was no exception. Nothing was said for what seemed like minutes but was probably only a few seconds.
"Sue do you...,"
"Ben could we...," Sue said simultaneously.
"You go first," I said.
"No, it's ok, what were you going to say?" she countered.
"I was just going to ask... if you wanted to sit on my lap in the armchair, as there is only one place to sit in here. What were you going to say?"
She grinned, "I was just going to ask if we could maybe get a bit more comfortable, rather than standing here. Great minds think alike, eh?"
I sat down first and waited for Sue to sit on my lap as she had done before, but to my surprise, she put her knees either side of mine and sat down on my lap facing me. Her skirt was so short that it couldn't tuck under her, and I could already feel the delicious warmth from her bare thighs and panty-clad bottom pressed into me. My cock had an instant reaction and filled with blood.
"God Sue," I said, "you know how to get me randy without even trying," I grinned.
"You're too easy," she grinned back.
She slid forwards a bit more until her crotch was resting on mine, then squirmed a little until I could feel she had positioned herself right over my erection.
"Mmmm, that's better," she muttered.
I put my hands on her hips and held her there.
Now that we were in a more intimate position, with no doubt about what was resting on what, we seemed more able to talk candidly about things, almost as though it unlocked our normal inhibitions.
"You know when we did it," Sue started, "and I wanted to, you know, feel your stuff in me?"
"Yea, but talk quietly, remember the neighbours might be about."
"Yes, ok,...well, I knew it was a risk, so last week, I plucked up courage and called into the new Family Planning Centre and found out that now, I don't have to be married to get 'the pill' and it's all confidential, so I got some prescribed."
"You did?" I said, astonished that she went and did it.
