Saturday.

Saturday morning dawned in a way that I would never have believed in a million years. It was my fortieth birthday, but that still hadn't occurred to me at this point. I hadn't even opened my eyes yet, and already the day was great. The wonderful sensation of being on the receiving end of a world-class blowjob first thing in the morning is something I had dreamed of since I first discovered the delights of having my cock enjoyed by someone else in such a way.

It was something I had told my wife was one of my greatest sexual desires, but she was never very interested in what I wanted sexually and even less so after we got married. After the kids were born, she was downright anti to anything I wanted sexually. So, as you can imagine, being not quite awake, not completely aware of my surroundings and experiencing something that I had desired for most of my life was so wonderful that it could only be a dream.

Some things were starting to filter through, though, that were telling me that this was actually happening. The sensation was so damn good that it outperformed my imagination. Whoever was performing this was a true master of the craft and was doing things with their tongue that I had never experienced. The sounds made by a quality, sloppy blowjob were unlike any other, and I could hear them quite clearly. I cracked my eyes open, expecting the room to still be dark. The blackout blinds I put in a few years back are fantastic, but they had been pulled open about halfway, and the early morning light gave the room a warm golden glow.

Front and centre, the first thing I laid eyes on this morning was a lovely, shapely, naked ass. It was at this moment that I remembered who was here. I remembered that my mum and my sisters had come to visit me, and I remembered that Sharon had spent the night in my bed because we couldn't get the couch to unfold. I then remembered what had happened during the night, and the realisation that the best blowjob I had ever received in my life was being performed by my sister hit me hard. I felt my cock twitch and swell in response at the same time as I let out a deep guttural moan.

Sharon released my cock and turned to smile at me. She held up a finger to her lips in the universal “be quiet” signal. She crawled up the bed with a big grin on her face. Her naked breasts swung beneath her, and her hard nipples dragged across my body.

“I don't think anyone is up yet. They weren't five minutes ago, but you don't want to wake them up before we are finished.”

“God, no.”

I grinned in excitement, but I was still quite stunned to find myself in this situation.

“Happy birthday, little bro.”

She never called me that, but I think she was getting just as turned on by this situation as I was. She giggled and turned back to what she was doing. In the process, she presented me with her ass again. God damn, it looked good, but I wanted to see her pussy too. I reached up and ran my hand over that glorious round rump and nudged her closer to me. She moved her leg, and I could see her wet and open pussy just staring back at me. She just looked so delicious that I had to have a taste.

I pushed her a little further and half-whispered.

“Give me that pussy, Sis. I want to taste you right now.”

She moaned around my cock and carefully swung her leg over my head until her knees were at my shoulders. I stared at her magnificent ass and pussy for a few seconds and then dove in. I licked her from the hood of her clit, between her lips, dipped my tongue into her pussy and flicked it about, seeing how far in I could push my tongue. I sucked her lips into my mouth and flicked them with my tongue. Sharon was moaning around my cock as she sped up her bobbing motion. The sensation was amazing, and I could feel my cum beginning to rise from my balls.

I sucked her clit into my mouth and circled it with my tongue. I was rewarded with a fresh flow of juices from her open pussy. I released her clit and greedily slurped up every drop of juice I could find. Sharon's actions were becoming frantic on my cock, and I was getting very close to losing control. My tongue was going crazy all over her pussy, and my nose was buried inside of her. I just wanted to be covered in her sweet cum. I couldn't get enough. I ran my tongue again from her clit to her perineum and tickled that sensitive piece of skin with the tip of my tongue. By now her thighs were shaking, and she was practically twerking on my face as she tried to get my tongue to touch her everywhere it could reach.

I placed one arm across the top of her hips as I slid two fingers deep into her pussy. Remembering her reaction last night, I curled them towards the front of her vagina and began stroking her. I was staring at her puckered asshole, and I decided at that very moment to try something I had never done before. I began flicking the tip of my tongue around her asshole. I was completely unprepared for her reaction, though.

If my cock wasn't buried deep in her mouth, the whole house would have heard her moan. She began to shake violently as though being shocked with electricity and began to growl around my cock. The vibrations felt amazing and pushed me one step closer.

I clung on like I was in the world's sexiest rodeo and continued to tongue her ass as she rode out her orgasm. Her pussy was clutching at my fingers, and her cum was dripping out around my fingers and down my chin. Eventually, she stopped moving altogether and released my cock. It was frustrating because I was so close.

“Oh my God. Please stop. I'm so sensitive right now.”

I eased my fingers out of her, which released another small flood of her cum. I could feel it all over my face, neck, and chest and running down around my neck to the pillow beneath my head. The whole bed was going to need to be changed and washed, but I couldn't have cared less. Right at this moment, I was in heaven.

Sharon moved off me and stretched out on the bed next to me for a moment, and she half laughed, half groaned.

“I don't want to know where you learnt to eat that well, but I am so fucking grateful you did. That was incredible.”

I felt myself flush with pride; I mean, who doesn't like being told they have done a job well?

Sharon climbed off the bed and stood there looking at me for a few moments. She raised her arms and did a slow twirl, allowing me to inspect every part of her naked body.

“So, do I still look as good as you remembered?”

“Better. I can see more of you now than I did then. I didn't get to see your beautiful pussy and incredible ass back then, but fuck, I wanted to.”

“I wish I knew back then what I know now. Think of all the fun we could have had over the years.”

“I can't believe I made my sister cum with my tongue or how good it feels to make you cum.”

Sharon had a dark little chuckle.

“We are so fucked up and wrong, David. I can't help that it turns me on so much, though.”

“Me too.”

I stood up next to her, took her in my arms and held her naked body to mine. I kissed her deeply and then watched as she licked her lips.

“I love that I can taste my cum on your lips.”

“I love the taste of you.”

“I love the taste of you, too. Speaking of which.”

She did this sexy little shimmer as she slowly squatted down. She rubbed her hard nipples against my body as she dragged them down the length of my torso. I watched as the head of my cock appeared between her breasts, then as she lowered her head and took me back in her mouth. She began bobbing her head again, but this time just on the tip, focusing her tongue on the sensitive underside. She had one hand wrapped around my shaft and was stroking it in a steady rhythm. She used her other hand to gently tease my balls for a few moments, and then she slipped her finger between my thighs and began to massage my perineum. It felt amazing, but then she pushed it further back and began circling my anus with the tip of her finger.

No one had ever touched me there, not even a doctor at this point in my life. The sensation was incredible, and I could immediately understand why she liked what I did just moments ago. My hips began a slow thrusting motion that I seemed to have no control over. My orgasm was growing rapidly, and my breathing was getting deeper. I couldn't believe all the sensations she was bringing out of me.

I was getting very close now, and I let her know, but the only reaction I got was an increase in speed from her tongue, mouth, and hand as well as an increased pressure from her finger directly against my ass. The shock of the sensation slowed my orgasm for a few moments until I realised her finger was now sinking into me and it felt incredible. She began pumping my ass at the same rate as my cock, and that sent me completely over the edge.

I groaned, far louder than I should have, but I had no control over it at all. The first blast of my cum rocketed from my cock straight into Sharon's mouth, and her only reaction was a moan of her own. She continued the motions until she had completely drained me, and my thighs were shaking like they wouldn't support me for much longer. She swallowed everything I had given her and then licked her lips. She then licked the remaining drop of cum that was hanging from the tip of my cock before smiling up at me. She gently removed her finger, then stood up and kissed me deeply. I could taste my cum on her lips and tongue and was surprised that I didn't mind it at all. She stepped back for a moment and gave me the sexiest, sultriest look I had ever seen on her face.

“Happy birthday, baby... brother.”

Sharon gathered up her shirt and came back to where I was standing, still in a state of shock.

“I think I better have a quick shower. It might not be ideal to greet the others smelling of sex. I have to say, it’s been a while since I have had a morning like this. I like it, a lot.”

She turned around and headed to the door. I admired her delightful ass again and the way her muscles moved beneath her smooth skin. She peeked out the door to make sure the others weren’t up yet and then strutted naked out of the room and across to the office where her clothes were. I closed the bedroom door and turned around. The bed looked exactly as you would expect it to. Rumpled and covered in multiple wet spots. The whole room reeked of sex, and I knew I had to do something about it.

I opened the blinds completely and the window to allow some fresh air to flow in. I then bundled up the sheets and put them in the corner. While I was doing this, I heard the shower start. I picked out clothes for the day and then sat and waited for my turn in the shower. For a moment, I considered just going into the bathroom and joining Sharon in the shower, but quickly decided that it was probably a bit too risky.

Finally, I heard the water stop, then a few minutes later, the bathroom door opened and closed. I gathered up the bundle of laundry along with my towel and, inspired by Sharon’s nude walk, dashed to the bathroom. I heard sounds coming from the kitchen behind me and realised that Hannah and my mother were already up. If they had looked in my direction, they would have seen my bare ass as I dashed in through the bathroom door. My heart was pounding with excitement, and I giggled like a little kid. There had been no cry of shock or smart comments that followed me, so I was pretty sure I had gotten away with it.

I stood in the shower letting the hot water flow over me and reliving the last twelve hours. It was stunning to think that everything had changed so much in such a short time. I had no idea that Sharon was so wild, and never, even in my wildest fantasies, had I considered that she would be even remotely interested in me sexually. I had experienced things that I never had before, and they were at the hands of my sister.

It was shocking; it was illegal, and if anyone found out, we would both be shunned. It was so wrong that laws had been written for thousands of years condemning it, and yet… and yet. Why was it so fucking outrageously good? Why did I want this more than I had wanted anything? Was it the risk? Was it the excitement? Was it the taboo nature of what we were doing? Was it because it was driving Sharon wild as well? Yes, yes and more yes was the answer, but there was more to it as well. Sharon had shown me more physical desire, attraction and love in the last twelve hours than I had seen in the entire twenty-year relationship with my ex-wife. How fucked up is that?

I towelled myself dry and shaved while I was in the bathroom. I also made sure to brush my teeth again. I put the sheets into the washing machine and turned to put my clothes on, and it was only then that I realised that I had accidentally left them in my room.

“Fuck.”

I wrapped my towel around my waist, grateful that I had picked one of the bigger ones I had bought recently. My ex took all the good ones with her when she left, of course. I tucked it into itself and made sure it was secure and not going to fall off. I opened the door just as Hannah was walking past. Thank God I didn’t try and risk another streak, or she would have got a full-frontal view of everything. As it was, she did a double-take, and I noticed her eyes give me a full scan quickly, even as she blushed. She always blushed easily.

“Ooh, good morning and happy birthday.”

I tried to play it as cool as possible, as though this was a completely normal way to greet your little sister.

“Thanks, Hannah. Good morning to you too.”

She surprised me then and gave me a big hug.

“It’s so good to see you, David. I’ve been so worried about you.”

“It’s been a rough year, but I’m okay. I’m a hell of a lot better for having you all here. It’s great to see you too.”

She snorted a small laugh.

“Speaking of seeing each other.”

She dropped down into a whisper.

“I saw your nudie run before, nice ass.”

She giggled at her little joke, but all I could do was blush. If it had been just minutes earlier, she would have seen Sharon do the same thing, and that would have raised a lot more questions.

“I hope I didn’t scare you. Hehe. Not used to having visitors.”

My laugh was quite nervous, and she leaned back and looked at me.

“It’s not like I’ve never seen you naked before; admittedly, that was a long time ago, though. Besides, it was a more exciting start to the day than I usually get.”

She had a cheeky grin on her face, and I could see that she was just winding me up now. As she moved, I felt the towel start to slip, and I grabbed for it before it ended up on the floor. Hannah stepped back, and I felt it start to come unravelled. Thankfully, I managed to catch it in time.

“I better get dressed before I embarrass myself even more.”

Hannah laughed and stepped back to give me room.

“It’s nothing to be embarrassed about, Dave.”

I could hear the laughter in her voice, and given that she was being cheeky, I decided I could be cheeky too. I opened the door, but before I walked through, I pulled the towel away from my body, showing her my bare bum. I heard Hannah squealing and laughing as I closed the door behind me.

I got dressed and went back out to the kitchen dining room where everyone was sitting around the table already. The sun was shining through the window, and it was obvious it was going to be a hot day today. I looked around, and everyone seemed to have the same grin on their face, like they knew something that I didn't.

“Good morning, everyone.”

I leaned over and kissed Mum on the cheek. It really did make my heart feel full to have my family around me again.

“Happy birthday, Darling.”

“Thanks, Mum.”

“Yeah, happy birthday, Flash.”

Everyone started giggling at Mark's comment, and it was obvious that Hannah had spilled the beans.

“I don't know what you could possibly mean by that name, Mark.”

I was overplaying the innocence to the extreme.

“Oh, so that must mean that Hannah was exaggerating about seeing you bare-assed this morning.”

I put my hand to my chest and gave my most dramatic, shocked look.

“Lies I...