Mary chose for herself some Muscle+, Height+ and several vials of Penis+, Balls+ and Male+, just for that extra kick while having sex. For Pearl, much the same, swapping out the male vial for female, and the Penis+ for Breasts+ and Pussy+. She added a few more drops of the Amazonian vial to Pearl's drink, and a slight bit of dominance in hers, and put the drinks out on the counter. And just in time.
Pearl burst through the door again, this time with two large bags and looking significantly more tired. Her face was flushed pink, and she tied her top - now drenched in sweat - around her breasts, showing off all of her succulent cleavage and toned midriff, a sight that Mary drank in easily. "Thanks for letting me stay, again," Pearl gasped. "You're too kind."
"Did you need any help unpacking?"
"No, I'm fine." Pearl leaned against the kitchen counter. Her eyes lingered on the cola, invitingly cold and refreshing. "Is that for me?"
Mary grinned. "Yeah, help yourself."
Pearl skulled the glass and licked her lips. However, before Mary could reach her own glass, Pearl grabbed that too and drank down every drop. "Oh, you have no idea how nice that was. Thank you."
Mary stepped back, staring in horror at her cousin. Pearl's stomach growled, and both could see the skin of her toned stomach bubbling as if it were alive. Suddenly, it broke into eight, clear-cut squares, and with another pulse, they defined themselves further, inches of cleavage between each one. Dozens of obliques sprung to life around them, framing a perfect muscular midriff that a bodybuilder might be jealous of. It was then they noticed that more and more of that incredible stomach was being exposed, as her top began to creep upwards and her pants slid lower over her hips. Pearl was beginning to grow taller, reaching 6' in no time at all, and surpassing 6'4 just seconds later. All the while the rest of her body was packing on muscle, matching her abs in musculature and sheer definition, each square inch of skin looking as though it were chiselled from marble.
Pearl groaned and ran her hands down her sides in the pleasure of the transformation, feeling her body swell and fill her clothes so absolutely. Seams began to pop and fabric tore, as the Amazon climbed higher and higher, wider and wider. Her shoulders bulked up to the size of pumpkins, her biceps rippling melons that rubbed against her body as she explored it. The 7' giant continued to enjoy herself as the next changes began.
Mary watched hungrily as Pearl's D-cup breasts blossomed to a proportional L-cup, and seemed to be made almost entirely of hard muscle, if the way they bounced and flexed at Pearl's will was any indication. She couldn't hide her raging boner any longer and began to tug at her shaft tucked in the folds of her skirt, before realising that she wasn't alone. Pearl's arms had snaked down to her crotch and were now rubbing her pussy as something bulged above it. Mary watched the skin bubble and distend, and a new growth came forth, one that quickly surpassed her six inches. Pearl wrapped her thick, meaty hands around her new cock and began to jerk it off, sliding up and down the foot-long shaft with ease as it belched pre-cum out. A thicket of dark pubes sprung from her crotch, followed by a dusting of hair across her whole body. Her armpits were the worst, now two sweaty forests of musk.
Pearl's voice dropped into a deep, lusty growl, even as her breasts grew larger, her hips and waist becoming an impossible hourglass, and she slammed them into the couch as she humped it desperately. Her red lips puckered into a pout as her basketball-sized nuts slapped the furniture again and again. The 8-foot Amazon groaned as she neared release, her 2-foot fuckpole twitching and shaking on the edge. One of her hands came to grope her muscular ass, digging through the e huge globes of flesh to find her anus and stuck a finger inside. It was all she needed. With a roar, Pearl painted the sofa white with a load large enough to fill a tank. As the last vestiges of transformation and orgasm left her, she straightened and turned to Mary.
Mary stared at Pearl with a mixture of horror and awe. Her cousin now stood at a whopping 8'6 and was likely as wide as Mary was tall, with the huge muscles that burst forth from every inch of her. Her hips certainly were that wide, and though her waist was tiny by comparison, the thick abdominals and obliques that covered it promised strength any wrestler would envy. Two tits the size of yoga balls perched perfectly on her chest, no hint of sag in them as she made them twitch and heave with each breath, and a light covering of fur dusted them, continuing across her body, but guiding the eye to her enormous cock. It was soft at a foot and a half, and two nasty, basketball-sized testicles hung behind, forcing her tree trunk thighs apart just to make room. Mary's own hard-on seemed utterly insignificant in comparison.
"Mary," Pearl said, in a tone far deeper than any woman she'd ever heard before. It still seemed feminine, and certainly sexy, but it commanded respect and dominance with every word and sent shivers down Mary's spine. "What did you do to me?"
"What? I- I didn't do anything!"
A huge hand slammed against the wall, just above her head. A spiderweb of cracks formed around it. "Liar!" Pearl roared. "You did this to me, you fucking pervert. Look at you, you're hard just from the sight of me."
"I swear, I didn't mean to! It was an accident!"
Pearl leered down at her cousin, now puny against her huge body. Mary was really beginning to regret adding in that vial of dominance. "Fine. Let's say I believe you. Now, I want you to tell me how."
Mary looked up at her, confused. "You want to know how?"
Pearl grinned a wolfish sort of grin. "If whatever you did on accident gave me a body like this, imagine what I could do on purpose." She ran her hands down her body. "Look at me, I'm fucking amazing. A beast. I want more. You're going to give it to me."