You felt bad, sure, but your twin step sisters had been harassing you all summer. Constantly making fun of you for staying inside working on your “science project”, and being an overall nerd. They didn’t understand you were on the cusp of breaking through on your new wonder drug, that every second you spent tediously tweaking your recipe instead of basking in the sun you were taking steps closer to perfecting it. Designed as the ultimate aphrodisiac and body sculpting enhancer, you had crafted the cocktail to morph and improve someone's physic into that of their idealized perfection. So, when the idea of human test subjects arose you decided it wouldn’t hurt to get a little bit of revenge.
Acting reluctant, you finally agreed to go to the beach with your two step sisters. They cheered as they prodded you into buying a few drinks for them on your own dime as they whisked you off to the beach. Deftly you poured the perfected concoction into the twins drink and smiled as the two of them posed for pictures, and made you take endless shots as they teased you, and flirted with every man they saw on the beach. You just smiled and watched the two blondes as they soaked up the sun and attention. They had always been mischievous and flirtatious with boys, and a bit narcissistic. Pert heart shaped asses and dirty blonde hair, and a penchant to constantly copy each other lead to a ridiculous amount of stares from passersby. You just merely chuckled to yourself as you slowly watched their attitudes begin to become more bubbly, their bodies beginning to bounce ever so slightly more with each passing minute. You had done all your calculations, been thorough, and you were sure within a few hours the changes would be complete. Sitting back and watching your two step sisters slowly transforming into their deepest desires was incredibly arousing. The power trip was not lost on you, and you knew before long you would be witnessing the creation of two sexed up bombshells, but how would they turn? Your cock twitching with every shot they demanded you took, as they bent over and stuck out their tongues are the camera. Hanging out by the water you watched as they sprawled out in front of you, soaking in the sun never noticing their bikinis becoming a little tighter, their tiny swimsuits shrinking on their hips. The way they kept looking at each other, the way they looked at you.
Grinning like two predators looking at future prey, you merely smiled, letting your hand slowly stroke your cock right to their eager faces. You suggest that you all head home and get cleaned up, slowly rising from your sandy spot, never letting your eyes break contact. The twins merely stared as you rose, cock stark against the wet swim trunks, their tongues tracing their lips in perfect synchronicity. Groaning you drive the whole way home rock hard as your step sisters, now nearly bursting out of their micro bikinis, couldn’t stop making out in the back seat. Barely able to keep your eyes on the road, as you watch the two exploring curves they never had before, watching as one twin twirls her fingers around the other's erect nipple. Some part of you feels wrong, that you have fundamentally changed your step sisters, but as one of their hands slithers up around your cock from the back seat, and then a second, stroking you in tandem willing your cock to pump precum all over your seat, you decided that there is no going back. Nearly exploding from the dream handjob of your life driving home, watching them moan and furiously make out in the back seat, you pull into the drive, ready to spin around and fuck your step sisters right there in the car. Within a flash you are stunned to see two naked bouncing asses run from the car and dart into your home, giggling the whole way, and leaving all their clothes in the walkway.
You come running in the house behind them, erection bouncing all over in your eagerness. You hear them closing their door to their shared room as you come spinning around the hall. Groaning and panting you are left standing outside their door, pumping away at your cock needing to get off. You hear them making out in their bathroom, passionate kissing, with a plethora of soft whispers. You can’t help it, it's all too much, as you explode all over their doorway, only to hear moaning increase on the other side. Within hours, your step sisters had gone from annoying flirts to straight up sexy sluts. You could feel their need on the other side of the door. In a fit of desperate, ignorance, and need you ran back to your room to gamble on ingesting your own concoction. Barely aware of your thoughts, or the consequences.
The twins had never felt so in sync before. Bodies melding into perfect copies of each other, progressively becoming sexier, smoother contours, and above all else, incredibly aroused. They had kissed multiple times before, always as a secret, never to be talked about, but now, it felt as if they couldn’t stop kissing. With each glance, or bat of their eye lashes the twins settled deeper into their passion. They could sense they were changing, sensed that this had always been fantasy, now it was ecstasy they could taste. It felt so good. Every cup size, every time the thong tightened up on their slowly expanding behinds, the way the blonde was growing more and more platinum. The moment they got to be alone they knew they needed each other. They would get to the step brother soon, they knew that he had such a perfect cock for them, but first they needed each other. Hands began to explore and caress each other's florioushing bodies, finger tips tracing the thickening curves; getting tangled up in the perfect curl of their lengthening hair. Tumbling to the floor the two of them got lost in the discovery of all the taboo they had secretly longed for, the need of connection of feeling themselves intertwined. As if it was always natural the twins began to let their tongues dance across one another, spooning into each other's thighs as their tongues began to trace their way around each other's soaking wet cunt. Feeling the folds spread apart as the tips of their tongues danced across each other's clits, pulling forth little lightning bolts of pleasure. Unaware in their bliss of the growing changes. Both womens bodies swelling outward, tits burgeoning through the alphabet hitting some where in the DD’s and moving up, backsides bubbling slowly out till each sister had more than a handful to grip as they grew desperate in their needs. Still growing as they each reached climax together, their tongues working through more and more soaking wet pussy as their body enhancement transformation lightened their hair and bronzed their skin. The moaning and screaming crescendoed into a howl as the two women collapsed upon themselves, spent and lazy, they tumbled into a slumber wrapped up in the arms of one another. A tangle of blonde hair and sex the two women lazily kissing each other as they drift for a short while in bliss.
You had swallowed the concoction and were already starting to regret it and feel it. You had tried to calm down since the moment of haste. You were sure your step sister will be fine while you figure out your next steps before you begin to fully transform. Stroking your cock seemed to help you calm down as you kept switching between throwing up, and letting it all play out. You had the house to yourself and no one would know of anything for a long time. As you ejaculated another massive load from your cock (the third in the last 10 minutes of pondering), you scratched your thickening stubble on your face. Groaning you felt your thickening cock lurch back to life mere moments after your last load. Shrugging you hefted your meat log into your hands and went back to wondering what you should do knowing that your cock was certainly most important right now. Maybe you should go ask your step sisters what you should do? That seemed like a good idea, and somehow it came back to you that you had drunk the potion because of your step sisters. Why was that? Huh it was surely getting harder to think while your cock was so hard. You had decided that two hands would make this process easier as you had far too much cock for one hand now. You began trudging your way back through the house to your sister's room. Surely they would be able to tell you why you had taken the potion.
Walking up to your sister's room you realized you had been gone a little while, your cock was leaking everywhere at this point, and you were in a constant state of either leaking pre-cum or ejaculating monster loads across everything. You had swelled in size and the door to the girls room was smaller than you remembered it was when you came across it ajar. Pushing in, your cock leading a good foot in front of you as you fumbled into the room. You came across what you assumed was your step sisters.
You could see that they were still your step sisters, not that they looked the same at all. They had the same eyes, and even smiled in the same way. But, that smiling wasn’t affection, the two of them starred you up and down, the mountain of muscle slowly being packed on by the potion. As they came back up from their stare, they focused on the pulsing head of your massive cock. At that very moment a huge glob of cum glistened from your head. The twins softly and deftly positioned themselves in tandem at the base of your cock. Looking over to each other, they began to make out around your throbbing cock. Gasping in pleasure you were dimly aware, this was somehow a plan, or fantasy, or desire of yours. But all you could focus on for more than a few seconds was how incredible it felt to feel each womans plumped up lips wrapped around your throbbing erection. Their bodies melded around your legs as they worshiped every inch of your slab of meat. Four hands, two lips and occasionally all four tits was barely enough to cover your still pulsing cock. It felt like a fire was building in your balls, as you pressed the two ladies together around your cock and used all of them as fleshlights to get yourself off. You could feel your muscles swelling in your arms as you effortlessly fucked the pair of women pressed together. A sloppy mess of sex juices, cum, saliva and sweat coated you all as your first eruption ripped from you. The twins practically showered in the torrent of cum. You were a fountain exploding across two willing sluts. Each woman let the spray splash over their tits as they lapped upwards and mewed into the eruption. They were erotic splayed before you, coated in your massive load. Your cock never flagged as the two women began to make out with each other drinking in the intoxication semen. You looked down at their bubbled out bodies and new you were going to have a very different life now.
Over the next few days the changes slowed down. Both girls became sexed up bimbo dolls, with inflated lips, platinum blonde hair, perfect cunts, long tongues, and gigantic tits. You had swelled up into a himbo meat slab, significantly more cock than brains and without much way of remembering how to make the concoction. But you still had a few vials left, and were considering what to do with them as you gazed at your twin sisters, giving you puppy dog eyes and starring at your throbbing cock. It hadn’t gone down in days, and was still going strong as the two women were endless in their needs. You groaned, standing up and plucking both girls off the ground to head back to the bedroom. Your giant frame easily dwarfing the two giggling bimbos. They cheered together as you threw them to the bed and began to play Eeny, meeny, miny, moe to pick which one you would spear upon your cock first.
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