Rouge was focused on her own massive bust, squeezing, groping and fondling it to her full delight.
She was holding her boobs in hands, looked down and pushed them both up into her own face, as to let her motorboat herself with them.
But then Rouge looked up from her cleavage.
She had heard something. The sound of someone approaching her.
Rouge turned around, using her observational skills she easily spotted the pair of light blue eyes that observed her from behind a bush.
Stepping out from the bush, a curious looking Sally Acorn walked up to greet Rouge.
"Ehh… H-hi R-r-rouge?..." Sally stuttered, trying her best to look Rouge in the eyes; "You look, um, b-bigger than… Eh, last time I saw you."
Rouge looked smugly at the curious, slim little girl who tried her best to not make it look like she was staring at were she was staring.
Rouge laughed, smacking her bust and letting it jiggle from side to side in an exaggerated way.
"Oh, you mean these~?" Rouge gestured at the still jiggling boobs spilling out over her stretchy clothing; "They're brand new, Sally."
"Y-yeah I k-know, Rouge. Heh heh." Sally laughed nervously; "I've was actually, err- y'know… Watching you while they, um, gre-e-ew all big 'n stuff..."
Rouge felt awkward now knowing her sense of privacy had been a false one. Yet, she could excuse it.
"Oh, that must've been quite a show huh, Darling~" Rouge teased Sally; "How long have you been watching me?"
"Ehh..." Sally murmured to herself; "I didn't mean to peek, I swear! I was just walking by and then I thought that--"
Sally went quiet as Rouge leaned over Sally, her boobs dangling inches from her face.
"Sally." Rouge said; "I could see it in you eyes. You want to use my emerald."
Sally tried to act like she didn't love having Rouge's tits in her face; "Well..." Sally asked Rouge; "You aren't using the emerald now, so I thought I'd at least… Ask."
Rouge let her boobs land on Sally's face; "Oh, my pleasure~" Rouge laughed; "We can begin right away."
~~~
Rouge told Sally about Tails' notes and research, as well as how to use the 'Chaos Grow' spell on herself.
Both girls held their left hand on the green Chaos Emerald, lifting it up together as they both yelled; "CHAOS... GROW!!"
It began spinning and floating, and as they spell took effect the emerald started glowing.
Sally had her thoughts focused on her hips and butt, so that's what started growing for her.
Rouge thought about her boobs and her thick plump ass, wishing it was thiccer and fuller.
Sally wasn't wearing anything besides her thin blue open vest, rocking her full-frontal look as always. Her future breast growth unhindered.
Rouge on the other hand yet again cast her spell in a way that her outfit would expand around her body at almost the same speed as whatever grew underneath.
The girls pair of asses subtly plumped up, and the inflation slowly began to set in.
Their asses filled up and became rounder and rounder. Sally dug her hands into her soft ass mounds as they swelled, growing softer and jigglier with every passing moment.
"Mmm~hmmmMMmmm~Mmmm~" Sally moaned gleefully, enjoying her ass growth combined with her fingers massaging themselves around her on buttocks.
Rouge slid her hands down along her hips, down around her ass and down along her thighs.
Rouge's thighs and hips widened forming a wonderful hourglass figure which now only grew and grew, filling out her outfit as it went.
She also used her hands to feel around behind her. The sensation of her big ass stretching out her outfit commanded her to press down and fondle her ass, even though she didn't have a direct view of it.
"Oh goodness, Rouge!" Sally explaimed as her butt had a strong swell, growing farther outward behind her; "I'm getting so big~~!"
Rouge turned around to glance at her friend, as her jaw dropped when seeing Sally's bountiful figure.
Sally had always been slim, without much curvature. but now, down under her blue vest two furry orbs hovered outwards with her tail resting up top.
"Ahhh~" Sally continued to moan, digging her hands deep into her soft and jiggly ass; "AAAHHHhhhh~ MMMmmm~"
Sally's two cheeks continued to inflate, and every growth surge caused her butts fullness to jiggle like jello.
Rouge was rubbing her hips as she looked at Sally; "How are you doing that?" Rouge asked in a romantic, bubbly voice; "It looks like you're growing faster than me!"
Rouge was intrigued.
Sally's eyes were looking up to the sky as she let her tongue hang out; "Oooh~ OOHHH~~" She moaned loudly; "Rouge!! This is. So. Good!!!"
As Sally yelled another big surge hit Sally's ass, continued by two more, then two more.
Now she was truly huge, her vests bottom now lifted up slightly by the orbs massiveness.
"YES!! YE-E-ESSS~~!!" Sally yelled, her pleasure coming to a climax as she felt forwards, stumbling as stomach landed on the soft grass below her.
Sally was panting heavily. The emeralds' glow altered and a very happy Sally felt her growth stopping, now focused on the wobbling ceaselessly jiggling behind her.
Now, the emerald's glow altered once again. Suddenly Rouge felt her own growth upgraded to have twice the power, as the 'growing' spell wasn't shared between two people anymore.
Rouge was taken by surprise, almost losing her balance as two extra thicc waves of energy hit her at once.
Rouge felt her clothing tearing, as it tried to maintain the swelling of her thighs, hips and ass.
"Whoa!" Rouge blurted out; "It's to much!"
Sally hadn't passed out from climaxing earlier, but Rouge's plead for help didn't land, as the heavy-bottom girl lay in the grass, playing her experience back in her head.
"CHAOS... GROW!!" Rouge yelled again as the emerald glimmered and glowed.
Rouge's underwear and outfit was on the verge of breaking, as it hadn't prepared for the sudden surge Rouge was hit with. Now, that' crisis had been averted, and Rouge's clothing didn't rip.
The clothing around her thighs and ass had gone from stretched to now holding on for dear life, as it continued swelling outward.
Rouge's spell directed half the emeralds energy back to her boobs and the clothing around it.
"Ohm, myy--~" Rouge bit her lip as she collapsed down to her knees.
Now both her rear and bust were growing at the same time.
"Oh~! Oh~!" Rouge moaned. The sensation was intoxicating.
All she could think of was to massage her swelling chest around the exposed flesh that was spilling out her clothing.
Rouge was growing a big hourglass figure, laying on her knees in pure delight.
She bit her lip again as her outfit grew slightly tighter and tighter at the front; "Oh yes! So... good…!" Rouge got very excited.
"Yes. More." Rouge remembered hearing Sally having her good time and growing faster herself; "More. I want more!"
Rouge started panting, drawing heavy breaths as she grew more euphoric, letting herself sit on the ground as her ass supported her.
*riiiip*
Rouge's clothing was starting to tear slightly around her boobs, as a strong swell surged through her and had her boobs bouncing wildly, and her butt stretch out on the ground she now sat on.
"OHH~~ It's gonna happen now! It's gonna happen now~~" Looked in awe as her boobs were about to break free.
*riiiiiiiip*
*RIIIP*
The front of Rouge's outfit had been forcibly opened from within, and two humongous round orbs flopped out and landed on Rouge's lap because of the way she was sitting.
"Aaahh~" Rouge let out a sigh of relief, at the same time she felt the spell lose effect and her growth subsided.
She reached her arms around her bust and leaned her head in on it; "This is better than anything I could've hoped for." She thought.
After Rouge got ahold of herself, she started inspecting her changes.
"Wow… Just. Wow!" Rouge said aloud; "I'm so gorgeous~! I've got the hourglass body of my dreams!"
She let her hands slip down around her exposed breasts, down along her waist and hips down to her thighs.
Rouge couldn't help but to moan at how soft her curves were, in addition to their profound bounciness.
She looked over to Sally, still laying down with her ass in the air. Audibly murmuring words like 'oh', 'yes', 'big', and 'mmph' to herself.
"Sally's gonna wake up soon." Rouge glanced at Sally's figure; "I'm should probably help her a bit with that."
Rouge touched the Chaos emerald, saying; "Chaos Control!"
Rouge's mind focused on the spells effects as the emerald glittered and spun around as it took effect.
"Now Sally's ass is gonna feel as light as air." Rouge pondered; "Hmmm. Interesting sensation." Thinking about how Sally will handle herself with an ass that big.
Then, as if on command Sally pushed herself of from the ground and stood up.
"Sorry I blacked out, Rouge." Sally told her.
"Oh don't worry." Rouge replied; "It was my pleasure. Literally." Rouge said, gesturing to her exposed busom.
"Eyyy, now were both full frontal, Rouge!" Sally replied lifting what little breast she had on her up with her hands; "Though… Mine's slightly less impressive."
Rouge chuckled; "I think it'll be tough for anyone to come near the size of me when it comes to theeeese-" She said, having her hands wobble them around.
Now, what did the two friends do next?