"Spread your legs for me," Mary commanded, pushing Sarah back against an armchair. Sarah did as she was told, folding her legs over each arm of the chair and using her hands to spread her folds wide open. She met Mary's gaze with half-lidded eyes.
"You gonna fuck me, stud? I'm all yours..."
Mary's lip curled. "Not yet, you needy bitch. I have an idea I'd like to try."
Grabbing the Muscle+ vial from the box, she poured three doses into a glass. Then, she found a funnel in one of the kitchen drawers and unceremoniously plunged it into Sarah's vagina. Ms Trent let out a squeak at the sudden, sharp rush of pleasure. As her fingers brushed the sides of the plastic, and Mary slowly stepped towards her with cup in hand, her eyes widened, realisation dawning. "Oh no, please-"
Mary put one thick, muscular finger to her lips silencing her. All the while, she poured the muscle juice into Sarah's awaiting pussy.
Sarah shrieked as the liquid trickled into her snatch, bucking her hips in an attempt to get it out, but it was of no use. Mary was too strong and forceful, and the liquid was absorbed deep within her quickly. She moaned and rocked as the effects began. Her trim, tight pussy began to bulge, growing larger until it stuck out between her legs. A thick mound that could be seen easily through any underwear, with lips that hung an inch down between her legs. But the strangest part about it was that Sarah couldn't feel any difference in size within her. It was as if the walls of her pussy had thickened with muscle.
Her cries turned to moans as all that new muscle began to tighten, growing stronger and denser with each passing second. New sensations arose as her hard, dense muscles twitched, completely under her control. She flexed and rippled her inner walls with ease, feeling them clench and rub against each other, her vagina collapsing in on itself in her quest to feel every inch of her womb. Her clit, now swollen and as long as her hand, became prehensile, a fleshy tentacle that wound around her fingers as she dug inside her thick flaps. Sarah's eyes rolled back in her head, all her brainpower devoted to the feeling of her improved genitals.
Mary watched on with a smirk as Sarah lost herself to her muscular pussy. Then, she grabbed the glass and turned back to the box of vials. While she loved how her idea had blossomed, she still wasn't sure if it was quite finished. After all, an amazon with such immense muscles and a mammoth cock needed a pussy that could clench hard down onto her shaft. But with the vials, she could make a cunt that was far beyond that. She wanted her chosen mate to have the most powerful pussy in the whole world!
She looked through a section that seemed to be all about the fantastical and drew out three vials. She dumped two doses of the purple liquid labelled 'Magic+' into the glass followed by two of 'Power+' and three of 'Strength+'. Mary turned around, a smug grin plastered on her face as she grabbed the glass and prepared to make Sarah's pussy truly ascendant.
Sarah, who had been left to herself, had already orgasmed once and was now leaning back in her chair, satisfied. The crunching of plastic resounded as she mindlessly worked the plastic funnel around in her vagina, tearing it apart with her fantastic muscles. With a flex, she spat out the broken pieces at Mary's feet. Her eyes turned to the glass in her hands and widened, expression growing desperate. "Is that for me? Oh, please, I want it, I want it inside me, please!" she begged and mewled.
Mary looked down at her pathetic display, some twisted satisfaction curling in her stomach. "Open up," was all she said. Sarah nodded, and her lips parted like flower petals opening, pulled apart by her vaginal muscles. Her clit lashed around, awaiting the incoming load. Mary shoved the entire cup into her womb. Sarah let out a lusty scream.
There was the sound of glass shattering, and Mary watched with interest as Sarah quickly ground it into dust. Her mountain of muscle groaned and churned as it grew even thicker, becoming completely indestructible. Each muscle was impossibly dense, holding so much raw strength inside it that it could crush any material on earth with ease. Mary stuck a finger in, just to get a taste, and immediately felt Sarah clench around her. She could feel how gentle she was being, her control so precise over every single muscle, yet even that slight pressure imprinted the idea that when it came to fucking, Sarah was completely in control.
As Mary withdrew her finger, she felt Sarah's clit dart out and was surprised as a sudden arc of electricity sparked across the gap. Her entire pussy was pulsing now with electricity, no doubt gifted to her by the 'Power+' vial. It was slowly generating heat, and Mary wouldn't have been surprised if a tongue of fire belched out from her powerful snatch. Not only that, it seemed her strength was enhanced even further, and she probably contained a nuclear reactor's worth of pure energy within her.
But the last change came with the addition of the 'Magic+' vial. There was a little pop as the glass dust was absorbed into her walls, and magically transformed into even more energy. Sarah raised her eyebrow at that. With enough input, she could become an endless source of energy, an insatiable sex goddess. She wondered if Mary could keep pace. As if stirred, a hazy pink mist began to form around her, lifting Mary's cock to full mast, then straining it even harder. Pheromones, she thought idly, making anyone aroused, and increasing their size if need be to fit her ravenous cunt. Knowledge suddenly spilled into her mind as she began to move her clit in a fluid dance. Her labia opened wide, showing her dark, wet pussy, now swirling with hypnotic colour - a new ability bestowed upon her by the vial. She could mould the mind of any partner she had to her will, or rather her vagina's will. She grinned but decided to leave Mary as she was. She was already deep in debt to her, and she felt a strange sort of devotion to the amazon who had shaped her so.
Said amazon was staring in amazement at the powerful, sexual creature she'd created, one hand on her foot-long shaft. Ready to fuck, Mary stepped up to the glorious being that was Ms Trent...