Amy Helps Her Sister

It would be very easy for me to be intensely jealous of my big sister, Sarah. She's intelligent, compassionate, beautiful, and successful, whereas I, Amy, am quite frankly, a mess.

Sarah's 30, a truly beautiful woman, 5'4 blessed with our familial masses of long, blonde curly hair, big brown, kind eyes, both of which we inherited from our mother. She's also been married to her school sweetheart, Greg, for 9 years. He's a total babe, a carpenter with the sexy rough hands and broad shoulders to match, thick, short dark hair, and gorgeous sky blue eyes. It would be easy to envy Super duper Sarah, but not me, she's an absolute sweetheart, she's my favourite person in the world, my rock and my idol. Sadly, she and Greg have been trying for a baby for around a year and a half with no success, and it's brought them down a little, however, my eternally positive sister has faith that one day it will all work out.

Looks wise, I'm fairly similar to my big sister, same big curls, same brown eyes, but there are obvious differences if you look closer, I'm 4 years younger, slightly less curvy, with smaller boobs and hips, but, importantly (to me!), an inch or so taller.

Importantly, I also have the opposite luck with men. I tend to attract creeps and losers, and have an impressive trail of terrible relationships behind me. How do we have such divergent fortunes you may ask? I have terrible taste in men (and women), always have, I'm a party girl at heart, whereas Sarah is a nurturing, loving, homebody at heart. Case in point, a few years ago I moved to London, to pursue fame and fortune, AKA party and have fun. I became quite talented at leaving a trail of wreckage, destruction and one night stands behind me, until I inevitably fell for one of the endless pretty boys that talked their way into my bed. Most of these relationships followed a template, drunken nights out, drunken sex, hungover & sore mornings, rinse, repeat, until someone (usually me) caught feelings, followed by a ghosting.

That summer, I was in a particularly intense 3-month relationship with a fucking loser of an arrogant, cheap, crap in bed musician, who seemed to think that the occasional threesome with my pals was an invite to fuck them in my bed when I was at work. (I know, I needed better friends, but, let's just say I wasn't exactly a saint). Queue another tearful call to Sarah, who offered to have me stay with them for a while, because she's a fucking angel. After wrapping up with work for a few months, I made the trip up to her beautiful home, to relax, recover and re-energise.

I did my best to be the perfect house guest, quiet, uncomplicated, helpful. I'd help with dishes, cooking, cleaning. A few days into my stay, I came to realise their house has paper thin walls, as I heard a gentle squeak coming from their mattress, and their sweet little whisperings to each other, telling each other to 'shh in case I heard', followed by adorable giggles. I felt a sadness deep in my soul, I wanted a big hunky Greg to make sweet tender love to me. Sadness gave way to arousal, as I imagined Greg and his big rough hands, and thick arms wrapped around me as he gently made love to me, and gave myself a satisfying, warm, shuddering orgasm as I heard their squeaks come to a gradual stop.

My sister and I are very close, and completely comfortable talking about sex, so you better believe I took the opportunity to tell them I can hear them fucking. Sarah just laughed,

'Don't be getting jealous!' she said,

'Too late for that!' I say, 'I haven't gotten laid in 3 months, and I haven't been fucked well in more than double that!' followed by muttered grumbling about the useless ex, who, whilst he could certainly find himself with more than one woman in his bed, would often fail to satisfy any.

'Maybe I should lend you Greg', she said with a wink, 'he's got a beautiful cock, haven't you Greg?!', they were each other's sweethearts, and as far as I know, they've only ever slept with each other. Greg's only response was to turn a beetroot shade of purple and leave the room stammering.

'He's adorable you know' I told Sarah, as I stared wistfully at his back,

'I know', she said, watching him leave, as we both sighed simultaneously, making us both burst out laughing.

...

Later in the week I got a text from Sarah asking for my help covering her bookstore over lunch whilst she ran some errands. She told me to throw on one of her spare uniforms, which consisted of a cute little check skirt and a white tee with the bookshop's logo. Happy to feel useful, I turned up at the shop looking the part, and with plenty of time to be shown the ropes,

'It'll be quiet,' she said, and asked me to do some organisation in the stock room out back if there's no customers.

It was quiet, as predicted, so I happily pottered about in the back, organising stock as instructed, until I heard the door chime. I saw it was only Greg, so gave a little wave, and continued to sort the tomes.

Absorbed in my task, I soon forgot about the visitor, glad to be distracted and doing something useful. Imagine my shock as I feel a huge, rough hand on my waist, with another snaking up my torso, making its way to my right breast and giving it a firm squeeze through my bra and top, instantly making my knees feel weak.

'Hey sexy' Greg's deep voice said, as his other hand snaked under the hem of the skirt and onto my clit, instantly making me wet. I physically let out a deep moan, months of frustration locking my body as I succumbed to the feelings I'd been missing. The blood and heat rushed to my pussy, my eyes rolled back and I submitted to the overwhelming feelings flooding in. My brain entered low power, instinct mode, as I bit my lip, hard. His breath on my neck drove me wild, as I heard him whisper something, but my capacity to understand was zero, months of drought too much for this, my body surrendering totally.

I needed cock. I heard his trousers drop, his thumbs hooked either side of my knickers, sliding it over my hips and dropping it to the floor. His hands caressed my body on their way back up, leaving a trail of fire, one hand firmly stroking my clit, stealing my breath, no words would form as his massive hand continued up to a firm grip on the back of my neck, pushing me forward, bracing me against the shelves. My body was in sexual autopilot, my hips pushing back eager to feel him, my mind completely lost in the sexual fog.

The hand on my neck dropped, I missed it already, but not for long as I felt his cock brush against my tingling labia, I felt him prod and reposition, animal instinct taking over told me to arch my back, rotate my hips and present the easiest possible access to my now soaking wet pussy. He quickly found the mark and gently entered me, a gasp crossed with a moan escaped my lips as he continued to slip inside me, it kept going, if I had any higher brain function at this point I would have noticed the beautiful thickness of his cock, but all I could feel was pleasure.

He continued to enter me, taking my breath away, I hadn't felt such a thick cock in years, as the feeling of fullness had me senseless. Finally, he bottoms out, I still remember the feel of the hilt of his cock pressed firmly against my ass, his curly pubic hair pressed firmly against my cheeks. I'd definitely never felt that full. I remember the waves of orgasm building; my mind focused on the thousands of tingling nerves.

Greg grunted 'Ungh, you feel so tight, you feel so fucking good!'

All I could do was grunt in response, my brain lagging seconds behind, muffled by the waves of pleasure. Perhaps somewhere in the depths of my consciousness my brain my brain may have realised, but the need to feel him fucking me overrode any higher functions. The exquisite pressure was all I could focus on, the building waves of pleasure as he enters and withdraws, the lewd squelches of my leaking pussy and the gasps of our breathing combined.

He kept a steady, firm, perfect pace, as he grabbed a handful of my hair and turned my face to kiss him in the darkness. I devoured him hungrily, reaching back to grab a handful of his hair and mash our lips together, it was an awkward position, but it felt so good to have a gloriously fat cock pistoning my pussy, a hand in my hair and one on my waist, and our tongues wrestling desperately. I could only take a few seconds of our frenzied mouths on each other, stolen gasps around each other's tongues, when I had to let go a long, guttural groan (I'm usually loud when I cum, apparently doubly so with Greg). I felt an orgasm building, my pussy beginning to subtly tighten and tremble. I whimper and moan with every thrust, our mouths still connected, feel him grunting and groaning along with me. He sped up, the hand on my waist moved up to painfully grip one of my tits, pushing me further and further towards the brink, I feel our juices start to trickle down my thigh, as he keeps building the tempo.

I mumbled something incoherent, words lost in translation, all I can hear from him is ragged breathing and grunts that let my lizard brain know he's close. I'm completely unable to think as my orgasm is tantalisingly close, the exquisite fullness, the strong hands, I have no control over my body, all that exists is my pussy, and that cock.

He whispered a breathy, 'Fuck... baby..., I'm going... to cum...' whilst pummelling me harder and harder,

I whisper back, desperately 'cum... please... cum... please' between his thrusts, it's all I can manage, no other words could possibly form, soon drowned out by a guttural grunt and a painful tightening of his grip on my waist and my boob. This pushes me over the edge as I cry out loudly in pleasure, tears beginning to form as the single greatest orgasm I've ever had washes over me. My vision tunnels as waves of pleasure jolt through my body, my body going limp, supporting my whole weight easily in his almighty hands, he pulls me in close, cock filling me absolutely, up to the hilt. That loud grunt repeats over and over, the same one I'd heard through the walls, as I feel his hot seed shooting deep inside me, feeling so incredibly full, that intoxicating pressure as his cum fills me completely, what little space was left inside my cunt, feeling it start to leak out around the edges of my pussy, his cum and mine sliding slowly down the inside of my thighs. He kept shooting, rope after rope, his extended orgasm giving me aftershock upon aftershock as I felt the pulses deep inside my pussy, feeling overwhelmed in his big strong hands, supporting my weight easily and completely as he delivers his wonderful semen deep inside me.

We both stood there for what feels like minutes, gasping, panting, shuddering, recovering. His cock still hard inside me, both breathing heavily. He gently let go of my boobs and waist, testing that I can hold my own weight once more. He rested his hands on top of mine and I miss their pressure instantly, as I have to grip tightly onto the shelves to support myself,

'Fuck that was fantastic, I love you Sarah'. As he did this, my senses began to return and the horror of what we'd just done, compounded as I felt his cum running down my leg and begin to reach my ankle. His hands ran over mine, pausing on my ring finger, conspicuously missing rings.

I heard him gasp.

'FUCK!' I screamed internally. We were both holding our breath, hoping it's too dimly lit for him to realise what's going on. He stuttered and mumbled that he has to get back to work, and slides out of my aching pussy with an audible noise, followed by an obscene splat as another huge glob of our combined juices hit the hard floor. I slumped forward, onto the shelf, still not trusting my wobbly legs, but remaining silent, continuing to stare facing forward, holding onto the dim hope that he hasn't noticed, giving us both plausible deniability. He practically ran out through the back door, without looking back.

I tried to recover, conflicted. That was the best fuck I'd had in years, but I had also just betrayed my sis, her husband's sperm was literally exploring my depths, coating the walls of my pussy and sliding down my leg. However, I can't deny it was one of the most erotically exciting things that's ever happened to me.

Involuntarily I slid my hand down to my clit, slick with his cum and my juices, and started to bring myself off again. I was close already when I heard the bell ring to announce someone coming into the shop, Sarah, cheerily calling my name. Panicked, I only had time to grab the panties that were discarded in the middle of the floor before she came in to the back room.

'Thanks sis! You've been so helpful, I'm so grateful, I don't know how I'll ever make it up to you' as she leant in for a kiss on the cheek. I cringed as I know I smelled of her husband's aftershave, and his cum. As she squeezes me in a big hug, a glob of cum rather unhelpfully made a break from my pussy, trickling quickly down my leg as I press them together. She sniffed the air and frowned, obviously recognising the smell but unable to place it,

'Hmm...'

My heart threatened to escape my body, via my throat, I quickly made my excuses and left, mopping my dripping pussy with my discarded panties and drove home for a shower. And yes, I fingered myself to another couple of orgasms using my sister's husband's cum as lube.

...

I slept off my exertions that afternoon, waking up just before they were due to get home, so I started to guiltily prep dinner. Do I tell Sarah? No, I can't break her up from her sweetheart, I resolved to keep it to myself and pretend it never happened. They arrived home within 5 minutes of each other. Sarah first, full of the joys of life, Greg shortly after, clearly nervous, instantly he looked at my hands, then at my eyes. I froze, he froze. The air seems to freeze. Sarah shattered the tension, breezing in, full of song, giving us something else to focus on. We made stilted small talk over dinner, whilst Sarah blabbers on, blissfully unaware.

We stumbled on uncomfortably through the evening, at which point Greg mumbles about heading off for a shower. As he walks past Sarah, she watched him go, and with a quick sniff of the air,

'Hold that thought' before theatrically whispering to me 'might want to put your headphones on Amy, I'm feeling feral today for some reason' with a wink. He looked alarmed as she dragged him into her room. I sprinted into my room, pussy already damp, unsure why really but knowing I need to listen in to this. It occured to me this is a bizarre situation, getting horny to listen to my sister fuck, but the fire in my pussy was overriding all logic at this point.

I could hear their voices through the paper thin walls. He was begging to go for a shower, I remembered he probably still has my juices on him. She put on a puppy dog voice, 'No babe, I'm so fucking horny I might die if I have to wait any longer', she says it's his fault, he smells really fucking hot today, the smell of his sweat is making her wet. I heard a belt coming undone and his weak pleas, followed by the familiar sound of his work jeans hitting the floor. I had an overwhelming instinct to put my fingers on my clit and begin rubbing lazy circles as I hear slurping sounds,

'You don't have to do that', he says,

'God I need to, Greg, I fucking have to!'

A few seconds later he was groaning, calling her a good girl and I'm absolutely soaking wet, I'm slightly concerned they'll hear the squelching sounds of my fingers in my soaked pussy thorough the wall. There's a pop, the sound of more clothes hitting the floor

'Fuck, look how what you do to me Greg, put that big dick in me, make me pregnant'. The situation devolves into a bunch of unintelligible grunts and groans, slaps and squishes, I stifled a moan as I vividly remember the feel of Greg's beautiful big dick filling me up. I hear Sarah have a huge orgasm in record time, followed by a gasp and series of grunts I recognise from earlier that day, which finally pushes me over the edge as stars explode in my vision and I pushed a pillow into my mouth to keep me from screaming out. I collapsed onto the bed and fade off to sleep to the sounds of the shower running.

I was woken up a few hours later to the sounds of rhythmic compression of bed springs and giggles.

'Someone's a horny boy today' said Sarah,

Greg grunts back, 'You're one to talk', he says, 'you practically jumped me earlier!'.

'I must be ovulating, you smelled so good earlier, you smell nice now, but man, I couldn't concentrate at the dinner table' Sarah purred. 'All I could think about was your cock' which caused Greg to moan quietly. The rhythmic, gentle fucking continued, the cute, sexy small talk did too, making me feel horny, sad and jealous all at the same time. Again I fingered my now slightly sore clit to a slow, sensual orgasm timed to finish as I heard him finish in her. Pangs of guilt, jealousy and arousal swirling around my head as I drifted back off, I tried to remember if I'd ever orgasmed 5 times in one day before...

...

The next morning they were both being sickeningly, adorably cute and lovey dovey, until I entered the kitchen and Greg got awkward again. Sarah asked me to cover the shop again at 12 while she runs errands, hubby and my eyes snap together, and quickly look away. 'Sure', I say, 'I've got nothing better to do' with a smile.

I reached the shop at 11:30, panties sticking to the dampness in my labia at the memories of yesterday, I got a big kiss from Sarah as she bounced out. As soon as the clock reached 12, I flipped the closed sign and went into the back room. There was an incredible amount of fear, anticipation, guilt and arousal fogging my senses. I didn't know if anything would happen, I didn't even know if I wanted it to happen, but I was drawn inexorably to that same shelving unit. I put my hands on it, and waited.

Long minutes passed until I saw a shadow fall. He called out Sarah's name, I didn't respond, I just hooked both my thumbs into my knickers, pulled them down over my hips and let it drop to the floor. He stepped forward, I heard the jeans hit the floor and I let out a little involuntary moan. A powerful hand in my hair pulled my head to the side and he kissed my neck aggressively, the other hand groping my tits hard. I felt his cock swinging between my legs, and his hand leave my tits to guide it into my waiting pussy. I'd been in a state of permanent wetness all day in anticipation, so even without the foreplay, and his rush to fuck me, he slid in easily, no gentle easing me in, just buried to the hilt instantly. There was no slow and steady crescendo this time, just a raw, animalistic need to fuck me hard, was it a punishment fuck? I don't know, but I didn't care. I felt it too, we were punishing each other, fucking fast and furiously, the power of his thrusts thrilling and exciting, I hadn't been fucked like this in years. He was getting more vocal, caveman grunts driving me wild, until his thrusts became spasmodic and brutal, and he said through gritted teeth. 'Fuck... Yes... Fuck... You... Ungh...' And unleashed a torrent of hot cum deep inside me again, I moved my hand to my clit and pushed myself over the edge while he unloaded deep inside me, my legs feeling weak as the waves washed over me. Again, we stood there, joined at the crotch, while we caught our breath, until he was soft enough to slide out with a pop and another splat. A tender little kiss on the neck, and he was gone, just like that, and I was once again stood in the stock room, skirt flipped up, my sister's husband's cum running down my legs, feeling the guilt for the second best fuck I'd ever had.

...

That evening was similar to the last, only there was less fear in the air, there was a lot of eye contact, eye fucking one might say, lots of stolen glances inbetween Sarah's even sunnier attitude. Again, Sarah made a point of dragging Greg off to bed before he showered. Again, I assumed my position, hand on clit, to listen to the show. There was less resistance from Greg this time, he was more dominant, and I could hear in Sarah's squeals that she loved it. Again I woke up to a middle of the night fuck, were they banging the wall on purpose? Sarah was telling Greg how much she loved this new burst of horniness from him, it was driving her wild, telling him to fuck her harder and harder, until he filled her up again, the third time he'd painted a cunt with his cum that day.

...

From there a routine developed, one that, looking back, would have looked insane from the outside. Most days I'd be woken up in the morning to the sound of bedsprings, gentle in the early days, accompanied by cute whispers, graduating to powerful, lusty thumps of the headboard hitting the wall, as the weeks wore on. I didn't mind, I'd use it to treat myself to a gorgeous sleepy little orgasm to start the day.

I started looking after the shop more and more. I volunteered to do every morning shift, 'giving them more time fuck' as I told them once, much to Greg's embarrassment. At midday I'd flip the sign, enter the stock room, and assume the position, Greg would come and fuck me with his beautiful cock, gifting me his precious seed, Sarah would arrive to take over the shop shortly after, making small talk, unaware that more often than not, hidden behind the counter, her husband's sperm were making a break for it down my thighs. I'd travel home in a delightful post orgasmic fog, preparing dinner like a good little sister wife, ready for Greg and Sarah to come home so we could all play happy families. Then Sarah would whip Greg off to their room so he could claim his wife in a bestial frenzy. Some days they'd come home and get a quickie in before dinner.

Greg had genuinely become insatiable, regularly getting laid up to 5 times in a single day, the man's stamina had grown to be incredible! I was irresistibly drawn to him, he exuded sexual power, I was desperate for his beautiful cock and to feel his addictive seed inside me, he owned my pussy, he owned Sarah's pussy, and we secretly shared his cock. The effect was electric, everyone in the house was constantly in a state of post coital bliss, we were all so much happier and content, like we were in a hippy commune, good vibes everywhere, even though Greg and I were effectively having an affair, fucking behind Sarah's back, it was having such a beneficial effect we couldn't stop if we wanted to.

Sarah mentioned the effect one night at dinner, saying she couldn't believe how well everyone was getting on and how happy everyone was. I joked and said 'Well, someone is getting laid a lot!' and winked at Greg.

Sarah laughed out loud and grabbed at his cock, biting her lip, 'I know, I can't keep my hands off him! I think the extra female pheromones in the house has had a wonderful effect on this guy' to his credit, the new confident, cocksure Greg didn't freeze up,

'Can you blame me?' Greg teased as he slapped his wife's ass.

I responded, 'No, I suppose not, these walls are thin guys, you two are like rabbits! And from what I hear, hubby has skills!'

This actually did make him blush a little, Sarah theatrically whispered across the table, 'Having you to stay was the best decision I've made in a long time! I hope we're not being too noisy?'

'Nah, these noise cancelling headphones are amazing', I responded with a wink, 'but seriously, I know you guys are trying for a baby, I know you need to be able to fuck when and wherever you have to, I wouldn't ever want to get in the way of that. You've been incredibly generous letting me stay here and I would be devastated to think I'm getting in the way of your babymaking. Please, pretend I'm not here, and don't hold back'. That brought tears to Sarah's eyes, and we hugged it out, shortly followed by her dragging Greg to their room. I loved sharing with my sister!

...

The weeks progressed into months, my 'relationship' with Greg progressed leaps and bounds, the pretence he was fucking Sarah was dropped, and we were fucking like rabbits, like honeymooners, in every conceivable position, in every conceivable location. We began to steal moments when we could, if Sarah was in the bath he'd tiptoe into my room, pull down my panties and fuck me hard and fast and quiet, until he filled me. If she popped to the shops I'd be naked the second her car pulled off the drive, shoving him to the carpet and bouncing on that glorious dick seconds later, begging for the next load.

I was addicted to the feel of his cum inside me. One weekend Sarah was out of town for a sales conference, the car had barely left the drive before he had scooped me up, taken me upstairs and thrown me on the bed. I pulled my dress up over my head, completely naked underneath, and pulled him onto the bed too. He loved it when I wore dresses with nothing on, and who could blame him, nothing got him harder than knowing (and I always told him) that there was only a thin layer of material between him and my soft, perky tits, and my smooth, inviting pussy. Rolling on top of him, I didn't even bother to take his shorts off, simply sliding his gorgeous cock out of the leg, and devouring that gorgeous meat, swinging my leg over his head and forcing my soaked pussy onto his eager mouth.

Then, we heard keys jangling in the door and froze. She was back, she'd forgotten something. I was naked, sitting on her husbands face, his cock in my mouth, on their marital bed. She shouted to say she'd forgotten her coffee, and we both exhaled, which was very funny, seeing as I had to do it around his cock, and him, straight into my pussy.

That first fuck was one of the first gentle, exploratory, daylight fully naked fucks we'd had, and we took our time. I revelled in the experience, watching his cock enter me slowly, transfixed by the rise in my tummy, watching how his arms tensed, his stomach moved as he thrusted slowly, and faster, how my fingers sunk into his flesh as I gripped during my approaching orgasm, how his eyes locked onto mine as he approached his. In return he gently explored the difference in our breasts, my shaved pussy, my ability to get most of that delicious cock down my throat!

I genuinely didn't get dressed the entire weekend. Greg took me whenever and wherever he wanted, all he had to do was grab my wrist, pull me to him, and I willingly obliged. We fucked in every single room, and once in the garden. I slept in his bed with him, experiencing those late night gentle cuddle fucks from the other side of the wall, those morning headboard shakers, those before and after dinner quickies, and they were glorious! I found out on the second night that my gorgeous stud had never done anal before (tsk tsk Sarah!), so I immediately made him go to the shops, playfully telling him he had to wine and dine me, and treat me like a good little wife before I'd let him fuck me in the ass (really I just wanted a bit of prep time to make sure it was perfect for him). He immediately dashed for the door, and came back with wine, flowers, and lube, like a true gent! Of course I then spent the whole evening letting him fill my ass, repeatedly! I orgasmed so many times I actually slept nearly the whole Monday just to recover. Still, my favourite was when he took me from behind and called me Sarah.

...

Everything was perfect, until, one day, I came home to Sarah and Greg crying and hugging, my heart immediately sank, until I realised they were tears of joy. Sarah shoved a positive pregnancy test in front of my face, I knew they had been trying for so long, and it had finally happened, and I was so overjoyed I also burst into tears. We had a good cry together and a huge outburst of joy. Once we'd all calmed down and ordered some food, Sarah sat us down with a conspiratorial look on her face.

She pulled my hands into hers and said, 'this is a wondrous miracle, and we both owe you a lot, you've played a huge, vitally important role in it all, and we'll both be forever, eternally grateful, but unfortunately... you're going to have to step up your efforts'.

I was confused, I assumed she was talking about Auntie duties or something. Then she dropped the bombshell.

'I know you two have been fucking'. Greg went white as a ghost, I started to well up. The repressed guilt of the last 6 months bubbling to the surface. She embraced me in a huge hug, wiped my tears and said 'I'm not upset, it was my plan all along' I sniffled in confusion,

'I've been a willing partner in this whole situation, even though you two didn't realise', she went on to tell us that she wanted it to happen and didn't feel any negative emotions towards us at all. Still completely confused, Greg and I were unsure whether to deny, throw up, or run away screaming.

Sarah laughed again, a big beautiful happy laugh, 'Relax, the both of you! When Greg and I were struggling to conceive I looked into all the research about fertility, we tried everything, it was all bullshit. One thing that stuck in my mind was a study done on rats, ironically', giving us both a wink.

'It found that male rats that had a single sexual partner had lower fertility than those with more than one. It also found that females who were in competition with other females also had increased fertility'.

She continued 'their ability to have children increased when there was competition. Also, another study looked at sperm counts of human males who were monogamous, polygamous, and cheaters, and found the latter to have by far the highest count. It's not exactly widely known, and not a common recommendation from fertility doctors, as you can imagine. Something to do with increased testosterone in all 3 cases'. At this point, for both hub and I, guilt and fear was now tempered with confusion, and she had us rapt with attention.

'Obviously', Sarah said, 'I couldn't really do anything with this information, but it stayed with me, at the back of my mind, and I started to fantasise about it. I started to get hot at the thought of Greg cheating on me, but I know he's far too sweet to ever do it, so it stayed there, just a fun fantasy I ran through when we were having crap, stressful, 'try to make a baby sex', no offence baby' she said, as she patted his hand.

'Then 6 months ago your dickhead ex cheated, which, I'm sorry to say, drove me wild, and I invited you to stay with us' This was such a labyrinth of emotions, I was struggling to keep up, we'd been played? Manipulated into having an affair, behind my sister's back?

'Almost instantly Greg got a lot more frisky once you moved in, thanks pheromones, and thank you for being such a sexy bitch' she said with a wink, 'but it made me think of that research.'

'I came up with my devious plan, getting you to 'cover' a lunch break. You didn't know, but Greg and I have been having similarly fun lunch breaks for months before you moved in. I simply 'forgot' to tell him you were covering for me.'.

Greg's mouth fell open. 'It was risky, I had to hope that both of you were silly horny enough to overcome your guilt/senses. Also, did you two idiots forget that we have remote CCTV? Hahaha, silly gooses!' Greg and I were both dumbfounded, small things were clicking into place, extremely convenient lunch appointments, evenings she'd spend out of the house, perfect timing with returns from lunch etc., we'd been master manipulated into having the greatest fucks of our lives.

'I can see you're both still scared and I need you to both take a breath and relax',

Sarah continued, 'I wanted this to happen. My biggest fear was that you would both have attacks of conscience and decide to confess, luckily, it seems Greg's cock, and Amy's pussy are good enough to keep a secret!'.

'I've been conveniently leaving at lunchtime, driving a few streets down and watching you two cuties fuck on the CCTV, and fingering myself senseless! Coming back to the shop and having our idle chit chat while I could see his cum leaking down my little sister's leg is honestly the single greatest turn on I've ever experienced in my life. Easily.' The eye contact with us both was intense. She took a breather, and gave us both encouraging nods, before continuing,

'Smelling the scent of his aftershave, not to mention his cum, on you ALL THE GODDAMN TIME, fuck, I've been horny 24/7 for the last 6 months. I've been sucking his dick, complete with salty post fuck taste and scent of sex nearly every night, and it drives me wild.'

'It's worked beyond my wildest fantasies, she went on. 'Look how constantly horny Greg is with all these pheromones flying around, he hasn't gone 5 times in one day since we were 17, and now he's doing it all the time! Look how toned we all are from fucking so much! Greg's got a six pack! His sexual stamina is unbelievable! With 2 beautiful women competing for his dick, his sperm production has been going through the roof as his body reacts to trying to impregnate us both, I can't be the only one who's noticed how hot, thick and creamy his cum is these days, it even tastes different, ok that's partially me giving him more mango and pineapple to eat so it tastes nicer for us', a sidelong glance to me, 'you're welcome sis' she said with a wink, 'and I don't know about you Amy, but this competition for dick has me horny, and fucking satisfied, 24 fucking 7'.

'Most importantly of all, this pregnancy test here shows it's all worked perfectly! You did this sis, you gave us the most perfect gift of all, by fucking my darling husband! I honestly don't think I could possibly love you more! Who better to help us along this journey than the person I love the most in the world, spreading her legs for my other favourite person'. It all made sense, in a twisted, fucked up kind of way. She'd planned and played it perfectly, selflessly, and everyone came out the end of it happier, healthier and closer connected.

Sarah began to tell us that she suspected she was a month or so pregnant already, feeling subtle changes, the morning sickness has started, mood swings coming into effect, her rampant horniness was beginning to reduce slightly.

'I'm going to get much bigger' she said, 'and much more tired, I'm not going to be able to fuck this king as often as he deserves, that's why I don't want you two to stop' she says, as she gripped my hand.

'We've all been so much happier and healthier recently, now I'm pregnant, we don't need to keep it in the shadows, so I'm going to need you to step up little sis!'.

'You're going to have to take one for our expanding team and go from one or two sneaky fucks a day, to filling the needs his royal highness has become accustomed to, on demand, think you can handle it?' she asked, eyebrows raised, my pussy burned, she was asking me to submit to this god cock whenever it needed, and I couldn't have been more eager when I nodded eagerly. 'Greg?' she asked, expectantly. Still dumbfounded, he looked at me, and nodded.

'Ok you can all breathe now, what do you two adulterers have to say for yourselves?' she said with a laugh. We both sat there, still trying to take in the enormity of the situation. Sarah laughed,

'oh snap out of it you two, in fact, I think you should start as we mean to go on, right now, and I'll get the food ready.' She took our hands, put them together and pushed us into my room. We both stared at each other.

'Oh my god!' we said simultaneously, and burst into laughter.

'I can't hear you fucking!' Sarah shouted from the kitchen. So I shrugged, hooked my thumb through my panties, pulled them to the floor, put my hands on the wall and spread my legs. Greg took a second, then I heard those jeans hit the floor, a firm hand grab my waist and pull my head back by my hair, as that gorgeous cock slipped inside me,

'Call me Sarah' I whispered...