Friday.

It was Friday evening, the day before my birthday, another decade older but definitely not wiser. The last year had not been much fun, what with Covid keeping everyone in lockdown and my wife leaving after twenty years together because she was bored. I had been left feeling low, vulnerable and unwanted.

To ease some of my frustrations, I had taken to writing about my fantasies and some of my past experiences. I used the experiences as fuel for the stories and then embellished them because the experiences I had had were mostly a bit dull and run-of-the-mill.

My favourite experience, though, had been very formative. This one didn't need any embellishment because the truth was amazing, and it changed me forever. It happened a lot of years ago now, but it still has an effect on me to this day. It was the beginning of a lifelong kink.

I was invited to spend the holidays at my sister's place with her and her boyfriend. My sister, Sharon, had moved in with her boyfriend only months prior. It was her first time living away from home, and the town they were in was a long way from home, approximately eight hundred kilometres, five hundred miles, away. They met at trade school, and this was his hometown.

They lived in a shared house with two other couples, and there were constantly people coming and going, crashing on the couch or the lounge room floor. It meant that I had to sleep on an old foam mattress on their bedroom floor in a sleeping bag.

Each night, about an hour after we had all gone to bed, my sister and her boyfriend would start fooling around. They seemed to think I was asleep and couldn't hear them, but I would stay awake waiting for that moment each night after being woken by them the first night. I would lay there pretending to be asleep until they were busy enough to not pay attention, and then I would open my eyes just a little to see if I could see anything.

Most nights I had to be content with just listening as my sister moaned and made little squeals of pleasure. It was incredibly exciting listening as they would get faster and louder until they both came. Sadly, because I was on the floor below the level of the bed, the most I could usually see was his back, shoulders and head as he fucked her missionary style. I didn't mind too much because the sound was enough to have me coming in my sleeping bag most of the time, but one night I got really lucky.

So much had to come together to make this happen, but luck was on my side. The first bit of luck was that it was a really hot night. This meant that they had opened the window to allow a breeze into the room. The second bit of luck was that it was a full moon and the moon was on that side of the house. The final bit of luck is that my sister whispered to her boyfriend that she wanted to try something different.

My curiosity was piqued, and I was trying to watch through squinted eyes. The moon brightened the room, and I didn't want either of them to look down to see me watching. I heard movement on the bed and heard him moan in pleasure. I moved just a little, but it was enough. There, sitting astride him, was my sister. Completely naked and highlighted by the moonlight coming through the window. Her rigid nipples jutting out from her small, pert breasts. She was very fit and had an athlete's body at that age. She threw her head back and moaned a deep guttural moan as she sank down onto his cock. She began to rise and fall slowly on top of him, and she seemed to be enjoying it a lot. She reached up and pulled on her nipples as she changed from bouncing up and down to rocking back and forth on him.

Slowly, she began to increase the speed of her movements. I could hear the wet sounds of her pussy as she rode him, the panting breaths she was taking, and the mewling sounds coming from her as her orgasm built inside her. I was stroking my cock in time with her movements, and a part of me felt like I was fucking my sister. I knew it was wrong and completely taboo to think like that, but the taboo nature of it just made it hotter.

Her moans and squeals got higher and faster, the sounds I had come to recognise as a sure sign of her impending orgasm. My own seemed to build in time with hers, and when she reached her peak, she threw her head back, placed her hands on his legs behind her and thrust her hips quickly back and forth, then froze in this position, perfectly lit by the light of the moon as she came on his cock. At that same moment, I too began to cum. I tried desperately not to make a sound as I emptied what felt like a gallon of cum from my body. Cum, that at that moment, felt like I was emptying into my sister's hot, lithe body.

Even now, twenty-plus years later, I still have the image of her naked body silhouetted in the moonlight with her nipples standing proud and her head thrown back in ecstasy, burnt into my memory with a laser.

I had been going through and refining some of my stories, getting ready to post them online. It was this particular story I was working on when I heard a car pull into my driveway. I was confused because I certainly wasn't expecting visitors. I got up from my chair and went to the other side of the house to see who was there. I looked out the window at a car I didn't recognise. I was feeling confused and slightly irritated now because I had just gotten a nice flow of work going on and wanted to keep going with it. Not to mention that reliving that particular memory had me quite hard too.

The passenger door opened, and out stepped a leggy blonde. I had just enough time to admire her firm, shapely ass in denim shorts before I realised that I knew her. It was a shock to the system for two reasons. One, I was not expecting a visit from my sister because she lived two states away, and two, I had just been admiring my sister's ass. The very same sister I had just been reminiscing about.

I felt myself blushing already, even though no one had seen me yet. The other doors of the car opened, and people started getting out. My mum was in the driver's seat, and my younger sister was in the rear passenger seat with her husband. I was shocked to see my family, and it took me a while to come to my senses and go to the door.

I heard the car doors closing as I opened my front door.

“Surprise!”

Yelled, Sharon as she ran up to greet me. She met me with a huge hug and squeezed me tight against her. God, I hope she didn't feel my hard cock press against her.

“You could say that again. What are you all doing here?”

I looked around at all the smiling faces and couldn't help but smile back. My younger sister, Hannah, nudged Sharon out of the way and hugged me as well, although hers didn't contain quite the level of enthusiasm that Sharon's did. I kissed her on the forehead, something that I have done with her for as long as I can remember, and she smiled up at me. Mark, her husband, leaned over after putting the suitcase he held in his right hand down and shook my hand. He too had a smile on his face.

“How are you doing, mate?”

“Bloody shocked, to be honest.”

Everyone laughed, and then Mum came around the corner. She looked tired, I assumed from the drive, but she looked happy to see me. I gave her a gentle hug and was saddened to see her looking so much older than I remembered her. I hadn't seen her in two years, thanks to Covid, and the two years had taken a toll. She was no spring chicken and well into her seventies now. It made me sad to think that maybe her time with us now was limited.

We went inside, and I fell into the routine of host duties. I put the kettle on to boil and scrounged through the cupboards for some biscuits or something that resembled hospitality. I was pretty sure I had none, because the kids had just returned to their mother's house, and I hadn't gone shopping yet.

"Sorry, guys, but I'm a bit light on for anything to eat. I wasn't expecting visitors."

Mum chuckled and went searching in one of the many bags she had brought in with her.

"Have you ever known me to turn up empty-handed?"

I should have known. She had a reputation for bringing enough food to feed an army, even when it wasn't expected of her.

"Oh, you're a lifesaver, Mum."

"Well, we did arrive unannounced."

"I still appreciate it. Thanks, Mum.”

I hugged her, and she smiled up at me. I felt a wave of gratitude wash over me at the sight of my family in my home. I was extremely grateful to all of them for making the effort to come so far to see me. As much as I had been downplaying the fact that my birthday was one of the big ones, on the inside, I had been quite depressed at the thought of being alone for it. I knew I would see my kids on the day, but they had gone back to their mum's for her week with them, and I couldn't afford to make demands about them staying with me for extra time. It had been hard enough to get the deal I already had, and I wasn't about to jeopardise that by being demanding and selfish. Still, loneliness is a crushing emotion and one that takes a lot of getting used to.

We sat down with our cuppas and began catching up. After a few minutes, Sharon asked about sleeping arrangements. I hadn't even thought about it, but it was soon figured out. Mum would sleep in my son's bed; Hannah and Mark could stay in my daughter's bed, and Sharon had the choice of the fold-out couch or she could bunk in with Mum. I offered to take the fold-out couch, and she could have my bed, but she insisted that I would not be kicked out of my bed.

“I'll stay on the couch, no offence, Mum, but you snore like a freight train. Do you mind if I put my things in the office, though, so they aren't in the way?”

I had a small room that I called the office because that's where the computer and some of my other junk were kept. It wasn't big enough to be called a bedroom, and squeezing a bed in there would require me to remove the door and the liberal application of a lot of lubricant.

“Sure, go for it.”

Sharon picked up her bags and wandered off in the direction of the office, and I settled back into conversation with the rest of the family. We talked for quite some time, and there was a lot of laughter, something that had been sorely missing from my home for quite some time. We finished our drinks, and I cleared away the dishes, then showed Mum to her room and my sister and her husband to theirs.

I left them to get unpacked and organised when it dawned on me that I hadn't seen Sharon since she went to put her things in the office. I walked towards the office and noticed the door was mostly closed, which was something I rarely did. In fact, I couldn't remember the last time I had closed it. Thinking that perhaps Sharon had decided to get changed or something, I knocked on the door and heard a scurry.

“You okay, Sharon?”

“Yeah, just give me a sec; I'm getting changed.”

“Sorry, I didn't mean to interrupt.”

“It's all good; you can come in now.”

I opened the door and noticed she had changed out of the clothes she had been wearing and into a pair of loose-fitting shorts and a T-shirt. The next thing I noticed was that she wasn't wearing a bra. I mean, it's not like it was the thing I went to check, but it was unmistakable. Her breasts were sitting a little lower than they were before, and her nipples were long and hard as they pressed against the material of her shirt. My eyes went straight to them, and I had real trouble tearing my eyes away from them.

“Oh. Ahh, I um, I'm sorry to barge in, Sharon. I was just wondering if everything was okay. You were longer than I expected.”

Sharon looked down at her breasts, acknowledging the fact that I had been staring at them, but not looking at all disturbed by the fact. She had a smirk on her face that reminded me of when we were kids and she used to tease me.

“I hate sitting around in the clothes I have been travelling in all day; for some reason, it just makes me feel... dirty.”

Was I imagining things, or did she emphasise dirty?

She picked up her bra that had been lying on top of the clothes she had taken off and held it up for me to see.

“I should probably put this thing back on, though; it's a bit too obvious I don't have it on.”

I could feel myself blushing, but I tried to give a noncommittal shrug as though I hadn't noticed at all. She smirked even more and then surprised me by turning away from me and lifting her shirt up and off. She handed it back to me as I stared at her naked back.

“Hold this for me, please.”

I took it from her and watched as she put her bra back on, expertly hooking it back together behind her. She then turned back around, facing me. I mean, technically she was covered, but I could still make out the hard bumps of her nipples through the light-coloured material of her bra and even the colour of her areola. She reached up and rubbed her breasts, looking at me the whole time. I just simply couldn't keep my eyes off them.

“It's so much more comfortable without a bra, but we have to do what we have to do.”

With a sense of bravado that seemed to come from nowhere, I heard myself say something that I never would have thought I would.

“Don't keep it on for my account; I don't mind, so long as you're comfortable.”

Sharon didn't say anything, but her smirk spoke volumes. She reached out and plucked the T-shirt from my hands and proceeded to put it back on. I was shocked to realise that I was quite disappointed now that she had covered up. I tried to carry on some kind of rational conversation, but it was difficult. In the end, Hannah came to the rescue.

She walked in and, in her usual way, just began talking. She had never been one to check if someone was already mid-conversation or not. I know I am making her sound rather selfish, but it was more a case of her mind working too fast for her to keep up with. We were all used to her flitting from one conversation to another, but it often made people who didn't know her uncomfortable.

“Mum wants to know what we are all doing tomorrow for your birthday. We didn't book anything because we didn't know what you had planned, if anything. Are the kids coming? Are they going to stay here too or what? Should we make a booking at a restaurant, or do you think we can just walk in and they'll fit us in?”

"Whoa, whoa, whoa! Slow it down a bit.”

I laughed as my mind tried to compose an answer to everything she had just asked me into some kind of rational response.

“Okay, no, I don't have anything planned or booked. Yes, the kids will be here, but they won't be staying the night. Yes, we should book somewhere, but I have no idea where.”

She just nodded and smiled at all of this except for the fact that the kids weren't going to be staying. This caused a small scowl to form but only for a moment.

“Okay.”

She turned around and walked out the door again as though this had been a completely rational conversation. I stared in awe for a few moments and then turned back to Sharon, who was quietly chuckling at me.

“You had forgotten what she gets like, hadn't you?”

I shook my head again as though trying to coax it back into a functioning state.

“Talk about mental whiplash.”

As though taking advantage of my mental confusion, Sharon threw out a sentence that took me completely unaware.

“So, how long have you been writing for?”

I froze to the spot like a deer in the headlights. I couldn't play this off as something it wasn't; my mind was whirling through possible denials and any other way I could talk my way out of this.

“Ahhh...”

There was that smirk again. She had caught me completely off guard and knew she had me by the short and curlies and was enjoying every second of it. That's when it dawned on me what I had been writing in here when everyone arrived. I had been going over and editing the story of the time I had watched her and her boyfriend fucking. How I had been masturbating as quietly as I could while watching her naked body slide up and down on his cock.

I knew I hadn't closed it; I also knew...