Grimacing, you give your sister's exposed butt-flesh the lightest peck possible.
"There, now get your fat butt out of my face!"
It was anything but fat, of course, but you couldn't help getting a jibe in. Unfortunately, judging by the laugh your sister threw out as she straightened, it didn't hit home.
"You WISH it was fat! Yeah, I know about your little kink, Adam," the young teen said with a smirk as she looked back at you over her shoulder. "All those curvy gals..."
Attributing your ongoing immobility to some sort of sleep paralysis, where you're not yet fully awake, you could only watch as Amy looked forward, away from you, and set her feet shoulder-width apart. She rolled her shoulders as she let her arms fall loosely at her sides.
"Don't know what you're talking about," you mutter in response, feeling glad that Amy wasn't looking at you right now as you felt your cheeks grow hot.
Amy laughed again, though it seemed strangely strained this time. You watched quizzically as her hands moved to grip her hips, her fingers pointing down her legs.
"Sure you doooooooo," The teen said, her sentence trailing off into a moan. "You can't hide anything from me-ungh!"
As the heavy grunt left her mouth her head bowed forward slightly and a shiver travelled down her body. You watched with widening eyes as her body emitted a strange, wet-sounding creak and her butt started to grow, slowly at first but gradually picking up speed as her buttocks gently started to fill out her already-tight shorts. Silent as the room was, you could hear the material whispering as it slowly adjusted to the increasing mass beneath it, her hips keeping pace and widening as her ass kept growing. Her thighs quickly joined in to keep in scale, the besieged gym shorts assaulted from all sides with swelling teen flesh.
"A-Amy, w-what the hell..." you croaked as you found your voice, your heart pounding in your chest. If the person expanding in front of you were anyone but your youngest sister you'd find it the hottest thing you'd ever seen.
"Haaaaaa, man this feels good!" Amy said with another groan as her hands gripped her swelling flesh at her sides, the top of her ridiculously curvaceous cheeks starting to bulge out above the waistline as the middle seam at her crack began to creak despairingly. "Soon everyone will want to kiss it!"
As your body was still ignoring every effort you made to shift it you could only watch on as Amy's lower body continued to bulk up and out. It was the most surreal thing you'd ever seen, your sister's skin remaining perfectly smooth as her butt, hips and legs seemed to thicken with the perfect mix of fat and muscle with no cellulite in sight. It was as if her butt and surrounding body parts were being enhanced, rather than simply bloated. Her shorts were rapidly approaching their limit, no longer stretching out to accommodate her expansion, small tears opening at the side and rear seams as flesh bulged through the holes and over every side.
"Don't you worry, Adam," Amy said, panting, as she threw a look over her shoulder. "I'll save the first taste for you."
Her grin melted into her biting her bottom lip and her eyes lidding halfway as more seams gave way with soft barks of protest, her buttocks well on their way to the size and shape of a pair of soccer balls with her hips and thighs grown to accommodate them. She groaned throatily as she shifted her stance and widened her feet to adjust to her swollen assets, powerful muscles bunching and flexing under skin and confirming that it wasn't just fat.
"Rrrrrr, I'm so strong!" She growled happily as more of the shorts surrendered to her increasing voluptuousness and her hands massaged her powerfully thick thighs. "I-I think...nngh!...this is it...!"
She tilted her head back and cried out in release as the pitiful remainder of her shorts burst off of her gigantic ass and hips, snapping apart and slingshotted to opposite sides of the room. Her cheeks quivered briefly before settling, rivalling certain fruits in size while maintaining a perfectly round shape, although with a slight sag that indicated their significant weight. It was the perfect bubble butt magnified to incredible proportions and even if you could move you wouldn't be able to take your eyes off it. Amy looked over her shoulder again, licking her lips as her hands groped, gripped and clutched at her enormous mass of recently-added flesh, her face flushed a bright red.
After a short while her eyes found yours again and her mouth widened into a wicked grin as she slowly but surely backed up towards your bed. You swallowed as you watched the hypnotic motions of her literally awesome lower body as the impossible mass of flesh approached. You swore you could feel every one of her powerful footsteps reverberate through the floor as she blotted out all light above you, giggling as she shook her enormous, perfect ass above your face.
"N-now, Amy," you stammer, finding that your head turned to keep her ass in sight. "I can only assume I'm still dreaming, but still, please be careful-"
You were cut off by the rapidly descending moon-sized ass as Amy let herself fall onto you, her entire lower expanse now wide enough to smother most of your upper body. You could only cry out briefly before her soft, supple ass-flesh engulfed you, plunging you into darkness and limited your awareness to the growing pressure now preventing you from breathing. The last thing you heard before you lost consciousness completely was Amy's satisfied sigh as she let her full weight press down on you...
You woke with a start, sitting up in bed with a shout. You could feel your heart hammer in your chest and your lungs heaving as they gasped for air. You looked around anxiously, seeing your room was empty, no Amy anywhere in sight. You collapse back onto the bed as relief washes over you like a warm blanket, rubbing your eyes with one hand as the incredibly vivid images of your sister with a growing ass flash across your mind.
'What the hell is wrong with me?' You thought as you groan and roll over in bed. 'Amy with a giant ass? What's next, Aly with massive tits?'
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