It was just another average day for the walking bombshell that was Cream the Rabbit. Her mother had sent her to do a quick grocery run, and as usual, the young lady attracted attention just by her mere presence alone. Her usual short-shorts were more stuffed than ever as her evergrowing rear end jiggled with every step she took. And her breasts were in the middle of their own spurt as well, as they were tightly packed into her orange tanktop, bouncing alluringly for all to see. Cream couldn't help but smile, as she had to hold in giggles seeing the silly look on people's faces whenever they caught a glimpse of her. How could she blame them? It seemed her growth was accelerating all over again, much to her pleasure.

As she was finally leaving the store with a bag of bread, milk, and a few of her specialty foods meant to help boost her breast growth, she ran into a familiar face. Literally. "Oof!" The rabbit grunted as she landed on her plush bottom, actually bouncing a little before coming to a full stop.

"Hey! Watch where you're going!" It was none other than Amy Rose who was now rubbing her recently expanded rear end, her eyes shut in a painful wince. "I've got a half a mind to-" The pink hedgehog stopped herself midsentence as she realized exactly who it was that she bumped into. "Cream? Oh gosh, I'm sorry! If I had known it was you I wouldn't have flown off the handle like I did!"

"It's alright Amy," Cream replied as she dusted herself off and picked up her stray groceries. "I should've been paying more attention to where I was going."

Amy smirked at that. "Enjoying the looks again? Careful you don't get a big head along with that big butt."

"I'll keep that in mind." Cream laughed in embarrassment. "So what brings you here today?"

"Oh just doing a little grocery shopping, I saw this new diet called Slim Healthy Mama and I figured I'd try to lose some weight around the middle." Amy put her hands on her hips. "After all, just because I have an awesome ass and set of tits, doesn't mean I need my gut to get big too."

"Really?" Cream eyed Amy's belly analytically. "But your belly already looks nice and slim to me." She giggled as she wrapped her arms around Amy's waist and giggled playfully. "You're thin enough around there to be mistaken for a wasp!"

"Well what can I say? I'm going for the extreme hourglass look." Amy grinned. "So how are you doing? Haven't seen you since the club performance a couple weeks ago!"

"Oh I've been great! Just taking care of Cheese, helping mom with errands..." She suddenly turned around and stuck her huge ass out towards Amy, wiggling her hips from side to side. "And growing while practicing my special talents. Hehe."

"Taking those lessons Sally gave you to heart eh?" Amy nodded approvingly as she admired the view. "Well if you ever fully master them, you'll definitely win a rematch with her if it ever happens." Amy gave Cream's booty a light smack, letting it wobble from the impact. "You're bigger than ever, and you still want it even bigger?"

Cream smirked and giggled deviously from Amy's playful smack. "Mmm, you know I do! In fact, I was actually just thinking once I finish my errands for mom, I would go see my sweet little fox boy and...persuade him to temporarily give me a little more junk in my trunk for some fun time." She groped her own ass, her fingers sinking into the soft booty flesh. Many passersby watched the sight and blushed, with some even getting nosebleeds. "And it's not just my butt either, my boobs have been going through a spurt too, bra's getting tight again!"

"I can tell." Amy crossed her arms over her own still slightly bigger chest and raised an eyebrow. "Must be nice to have your own personal mad scientist to change your size whenever you want. What happened to that size ray you told me on the phone last week he was making for you? He holding it hostage or something?"

"He says it's almost done. He said he wanted to add some 'improvements' on it or something. Didn't say exactly what though." She shrugged. "Heh, he told me he's been having a hard time finishing it cause he keeps thinking about what I'll do with it once it's finished, and get too flustered to work!" She giggled with affection. He's so cute."

"You're lucky." Amy scoffed, blowing a tuft of hair out of her face. "Even with these boobs and a booty to match, I still can't get more than a passing glance from Sonic. And it's not like he's running around with Sally, either. There must be something that I can do to get his attention, beyond bribing him with chili dogs."

"You know," Cream tapped her chin in thought. "I think I overheard Tails and him talking earlier this week about something to do with you. I think Sonic said something about getting bigger than the biggest girl he knows. I only heard just a little bit of it. I wasn't paying too much attention, I think I was practicing my twerking at the time." She giggled and gave a brief booty wiggle.

"Wait...for real?" Amy's eyes widened as she scratched her chin. "So that means...I'm just not big ENOUGH!" Amy facepalmed and laughed sardonically. "Of course, why didn't I think of it before? Everything about Sonic is extreme. His speed, his passion, his tastes...so sure, why wouldn't he be attracted to extreme proportions? It's so obvious...but...who's the biggest girl he knows? Wouldn't that be you?"

Cream chuckled. "Well, if you're just talking about ass, then yeah definitely!" She slapped her ass hard, making it jiggle. "But when it comes to boobs, my mom's the biggest I know. Then again, we haven't seen Miss Rouge in a while, and she was the bustiest out of all of us back in the day."

The thought of Rouge made Amy's blood boil. Back when she was just a kid, she was jealous of Rouge's breasts, and how she would flaunt them with those revealing outfits of hers. Maybe that's where Cream was inspired to become the...sexually promiscuous girl she knew today. Perhaps that's even where her own desires came from. The thought that Rouge may have gotten even bigger since the last time they met made Amy's heart quicken with anxiety. Surely she couldn't have gotten any bigger, right? "I'd honestly forgotten all about Rouge before you brought her up. Last I heard from her was years ago, some deep undercover mission for G.U.N. with Shadow. Wonder how she's doing."

"Not sure. I wouldn't mind seeing her again." She giggled deviously. "Especially her butt, heh heh."

"Why? To compare?"

"Well yeah, but also cause...well, she's just really sexy!" She giggled cutely, unaware of Amy's disdain for Rouge. "I wonder if she'd let me touch her booty. Oh! Maybe she and I could have a twerk contest just like I did with Miss Sally! Mmm, I'm getting excited just thinking about it! Another chance to redeem myself!"

"Hmmph." Amy snubbed her nose. "Knowing her, all she'd have to do is jiggle her tits around and you'd lose in two seconds, that batty bimbo."

Cream snapped out of her reverie as she heard Amy's rather colorful words. "Oh...s-sorry. I forgot you don't like her all that much..." She chuckled embarrassingly and awkwardly. "Anyway...umm...just out of curiosity, I thought you didn't want Sonic to only like you for your body?"

"Well I don't!" Amy exclaimed helplessly. "But I have to get his attention before I can establish a relationship! So if that means I have to go hyper big, then so be it!"

"I guess you have a point...well, let's just get these groceries home so we can visit Tails. Don't wanna waste time not getting bigger, sexier curves, now do we?" She hoisted her groceries up, carrying them in both hands.

"Right...my groceries can wait. I'll see you there!" Eyes blazing, Amy dashed out of the grocery store with a whoosh, running as fast as she could to Tails's lab. "You want big Sonic? I'll give you big!" She grinned madly. "In fact, I'll get so big that you won't even be able to see the rest of me behind my curves! And then I'll get even bigger!"

As Amy dashed away, Cream watched on with an astonished expression. "Wow...I haven't seen Amy move that fast since our Team Rose days." She stood there for a second before shrugging and continuing with her errand. "First thing's first. Groceries, then growth ray." In just under an hour, Cream made her way to Tails's workshop, and she saw Amy banging on the door with her fists. "Oh boy."

"Tails open this door or I swear I'm gonna smother you! And you aren't gonna enjoy it this time!"

Cream ran over and stopped her from trying to break down the door to the lab. "Amy, take it easy! Just ask nicely!"

"I asked nicely when I got here. I've been out here for half an hour!"

"Well then he's probably not here." Cream shrugged, but then her eyes widened as she reached into her side pocket and pulled out a key. "I just remembered, I can get us in! Tails gave me a spare key since we started dating!"

Amy's temper was derailed by that as she clasped her hands and cooed. "How domestic!"

Cream giggled before unlocking the door, and as she went inside she called out for her boyfriend. "Helloooo?" She received no answer, as she motioned for Amy to follow her. "Yep, not here. But don't worry, I know exactly where he left the prototype." She turned on the lights as she went, until she finally made it to the actual lab part of his lab. "Here we are."

Amy gave a low whistle as she observed the clutter. "It never ceases to amaze me how much stuff can be fit into one room." Amy rolled her eyes, then she turned her attention to a rather large roll of spandex. "Whoa, what could this be for? There's enough spandex here to clothe an army of superheroes." She looked around the table, and saw a blueprint that caused her eyes to widen. "Oh...my...god...Cream, this is a design for a sports bra...and I think it's meant for you, look at the size of this thing!"

"Wait what?!" Cream quickly abandoned her search and dashed over to look at the blueprint herself. Her eyes widened as she blushed profusely. "T-This...is for me?!" As she looked over detail, she could tell that Tails had put a lot of thought and work into what could only be described as a feat of engineering. "Holy crap, it's as big as the Tornado!"

"Looks like he had some sexy fun times planned..." Amy chuckled. "Now I kinda feel bad, I spoiled the surprise." 

"Don't feel bad, Amy. There's no way you could've known about this." She patted Amy's back softly. "Heck, even I didn't know. And he usually tells me about everything he's working on!" She smiled. "But hey, it's still a pleasant surprise to see. To be honest, I would've thought he'd grow my butt this big rather than my boobs."

"Change of pace maybe."

"Maybe. Then again, that's probably just cause I would've asked him to make my butt bigger." She giggled deviously with a wiggle in her hips. "Come to think of it, I think he's always been more of a boob guy. I've noticed him taking glances at my chest when working beside me."

"Oh I'm sure he appreciates both, after all you're no slouch up top." Amy felt the rabbit girl up with a smirk. "Not quite as big as me, but almost there. I'm guessing he just wants to...mix it up a little." Amy laughed. "He's so adorably innocent in some ways. You're lucky Cream. Experimenting with your own sexuality, figuring things out along the way. You might even find out that you love your tits as much as your ass, who can say...I hope I can have that someday."

"Mmmm, t-thanks Amy." she blushed and cooed softly as Amy groped her breasts, her nipples slowly becoming erect as she was being groped. "And if it's for Tails, I'll gladly do anything for him! If he wants boobs as big as his workshop, I'll give it to him no questions asked!" she bounced her boobs playfully in response. "Just as long as my butt gets some serious love too!"

"You may have to negotiate with him on that. After all...I saw you in the alley with that massive booty. He may want to see what that looks like from the other end."

"Heh, like I said, I'd gladly do anything for him." She winked with a smile.

"I'm sure you would...but that size of his workshop thing, I like that idea." Amy grinned. "Think that'd be big enough for Sonic?"

"Girl, if that DOESN'T work, then I don't know what will!" She smirked deviously, imagining how Amy would look with tits that big. "In fact, I think it'll look great on ya!" She then groped Amy's boobs, squeezing them together like dough.

"Then what are we waiting for?!" Amy rushed over to stand in what seemed to be a testing area, judging by the bullseye marks. She spread her arms wide. "Hit me Cream, and make it last..." She gained her own devious grin. "I wanna savor this moment for as long as I can."

"Alright, hold still!" she steadily aimed the raygun at Amy, and fired away directly at her chest.

Amy moaned as the familiar sensation of the ray hit her again, her breasts slowly ballooning outwards as her dress became even more insufficient at covering up her ass, as her breasts were demanding more and more of the fabric like someone stealing the covers in bed. "Oh yeah...t-that's the stuff...head-sized tits are so yesterday, it's time to stop being a little girl and get big!"

"Aw yeah! Grow, baby! Grow!" Cream cheered her friend on as she fired another shot at her ballooning bosom.

"Aaah!" Her face red with arousal, Amy placed her hands over her swelling breasts as the next shot hit them. The sensitivity was up so high, every graze of her fingers was a new experience in pleasure as the tingles sent her squirming. Her hands were slowly getting pushed away from her body, her fingers parting as more and more flesh filled them up. They had now reached the size of huge watermelons, and she arched her back to point them in the air as her boobs started spilling out the sides of her dress "S-So big...Sonic...w-will love them!"

Cream stared in awe at the size of Amy's breasts. They were close to her mother's chest size, yet they retained just enough firmness to keep their rounded shape. A special effect of the raygun perhaps? "W-Wow..." Without even thinking, Cream fired yet another shot at Amy.

"OHHH YES!" Amy hollered as the warmth of the ray struck once more, and her growth reaccelerated as her dress began to tear at the seams. "C'mon...keep going, this dress is for babies anyway!" She gasped as she heard the tearing of the fabric, and she moved her hands to be under her breasts instead so they could help with support. "Grow, girls, grow!"

As Cream continued to watch them swell, her smile slowly grew wider and wider. "W-Wow, Amy. Your boobs look...great! A-Amazing, in fact!" She stepped closer for a better look, and started to gently rub her hands over Amy's expansive chest swells. "Ooh, and they feel amazing too."

"T-They're gonna...gonna look even more amazing in a second...I-I...just...need to...outgrow...this..."

As the seams of Amy's dress continued to rip and tear, Cream stepped back to get a good look at the epic climax.

SHRRRRRIIIIPPP

The front of Amy's dress finally fell uselessly to the ground, and she lurched forward with a gasp as her breasts were freed of one constraint, now only held back by a bra that was obviously too small as it was now trying with all its might to contain melons that were three times as big as it was designed for. "Finally." She looked down at her chest, admiring it with a loving gaze. "Now that's what I call a great start."

"Whoa! Look at how huge they are! You left my mom in the dust!" She resumed rubbing and groping her friend's enhanced rack. "They look like they could burst out of your bra at any moment, heh heh." She teasingly traced her index finger over Amy's nipples.

"Oh god Cream..." Amy took a sharp intake of breath as a wave of pleasure shook her to her core, almost causing her to collapse to her knees "That feeeeeels amazing..."

"Whoa! Are they really that sensitive?" She gently pressed Amy's boobs together to see how Amy would react.

"Ohhhh gaaaawwwd..." Finally Amy fell to the floor, panting as she tried to recover from the sensation. "M-Maybe that's why Tails wanted to focus on your boobs..." Amy fell onto her rear, the weight of her gigantic tits threatening to put her on her back "Nipples are one hell of an erogenous zone...and right now...it's like times three!"

"Oooh...you don't say..." Cream looked down at her own plush bust for a moment, then a devious smirk formed on her face. She then fired the raygun at her own chest, gasping as the warm sensation started to overtake her almost instantly. "A-Aaah! Mmmmm..." She moaned from the building arousal as her tits puffed up considerably from her already impressive size.

Struggling to force her way back to her feet, Amy couldn't help but grin as she watched her best friend grow. "Nice, huh?"

"Mmmm! Oooh yeeeaaahh! F-Feels so goooood!" She moaned and cooed in sexual bliss as her tits ballooned up in her overly tight tank top. Her hips started moving on their own in a sensual, rhythmic manner. "Ooooh...Tails..."

"I get the feeling I'm not gonna be the biggest bust in the room for much longer..." Amy eyed the ray in Cream's hand and smirked. "So...I'll just take that."

Cream didn't even acknowledge that Amy snatched the raygun away from her. She was lost in her own sexual fantasy, moaning and swelling more and more. "Ooooh! A-Aaahh! Mmmhmhmm..." She bent over slowly and began shaking her ass in a very sexual manner as her boobs began ripping out of her tank top, reaching the size of small watermelons.

"This may be the hottest thing ever, seriously." Amy pointed the ray at her own breasts, moaning as they once again began to swell, her bra straining to keep them contained. "C'mon...let's burst out of this pathetic training bra!" Then Amy pointed at Cream, firing another shot at her so she would keep growing as well. "Don't fall TOO far behind now Creamy."

"A-AAAahhh! Oooh yeah!" As her boobs started growing faster, Cream's tiny top barely put up much of a fight as it was destroyed by inflating bunny tits. Cream's sensual booty shaking turned into full blown twerking as the arousal kicked into high gear. She had this strange habit of twerking uncontrollably when she was horny, which developed around the same time she got started with her career. "Ooooh yeah! Mmmmm, I wish Tails was here right now! Oooh! I need him...soooo badly!"

"H-Hey..." Amy huffed as her own bosom stressed her bra to the limits. "Don't fall into...bad habits. Remember what Sally taught you!"

"Oooh! Mmmm, I-I'm sorry. I can't focus on her twerk lessons right now...I just...c-can't help it..." She spanked her own ass while her bare, braless boobs continued to swell. "It just....f-feels too damn goooooood! A-Aaaaahaahhh!"

"Tell me about it...but man, this bra won't quit! It's starting to hurt! C'mon, break already!"

Cream looked over at Amy's expanding rack with a smirk on her face. "Need a little help there?" She stopped just long enough to tug playfully on Amy's stubborn bra. "Cause I can help you out there."

"No way." Amy shooed her hands away "This dumb ol' training bra isn't gonna beat me. I'm gonna grow right out of it doggone it!" She blasted herself again, and the growth sped up as she passed overinflated beach balls in size. It was no longer possible to see her torso from behind the massive mams, and the bra was only barely able to cover her nipples as the straps creaked. "C'mon...bigger...bigger...bigger!" With one last deep breath, the bra suddenly snapped, whizzing past Cream's head and falling several feet behind her, allowing Amy's breasts to finally breathe. "Ah, much better." She sighed in relief even as her bosom continued swelling down to her knees. "That's what I'm talking about. Finally getting past the small label." It was obvious that the more she grew, Amy's definitions of small and large were changing.

"Holy crap, that was hot!" Cream blushed and giggled as Amy's expanding assets kept on going after defeating her bra. "Mmmm, hit me again, Amy! I want some big balloon tits just like yours!"

Amy grinned and aimed the ray at her. "Your wish is my command...and Tails's wet dream." She fired again at Cream, and then turned it around and hit herself with it once more "And another for me for good measure...can't wait for Sonic to see these, not even he can resist breasts as big as my whole body! Once I get there...that is, they're still waaaay too small."

"H-HAAAAAHH! Oooooh hell yeeaaahh!" She practically screamed with pleasure as her tits grew bigger and faster. Her nipples were erect and firm as they swelled. "Ooooh, my nips are just SCREAMING for attention! Haaahh! I-I need somebody to play with them! A-Anybody!" She panted heavily and moaned in between breaths as her chest balloons filled the room more and more, now starting to cover up her torso.

Amy slowly walked over, her legs slapping against her tits as she did so. "Have no fear, Amy Rose is here!" With a lusty grin, Amy grabbed Cream's huge nipples and gave them a squeeze, slowly twisting them.

Cream let out a loud, lustful moan as her nipples were tightly squeezed and twisted. Her hips bucked forward uncontrollably in response. "Haaaaahhh! Mmmm...s-so gooooooood! Ooooh!"

Suddenly the sound of a door in the other room was heard, followed by footsteps coming towards the lab. The owner of the lab had returned.

"Huh, that's odd. I could've sworn I locked the door before I-" The fox boy stopped in his tracks, noticing the four giant, growing orbs of flesh in his workshop. "W-What the?!"

"Huh?! T-Tails? Is that you?" By now Cream had gotten so big that sitting on the ground, she wasn't actually able to see over her own breasts anymore, plus Amy's much bigger boobs filled up whatever was left of her line of sight.

As for Amy, the sudden appearance of Tails shook her out of her pleasure-induced haze, as her tits finally stopped swelling. "Oops...busted...uh...no pun intended."

Cream stopped growing as well shortly after Amy, leaving her with breasts well beyond her mom's size. She scoffed at Amy's statement. "Pfft, you totally intended that!" Then she turned to her boyfriend, who was standing completely frozen in shock. "Well Tails?"

"C-Cream...Amy...you're both s-so...so-"

"Big?" Cream cut off his stammering as she went over to stand next to Amy, which was easier said than done as she had to adjust to her engorged tits wobbling around. Then she bent over, letting her massive milkers jiggle and sway tantalizingly as she gave Tails a seductive smirk. "We know, don't we look good?"

"U-Uhhh...ummm..." Tails just blushed heavily, too speechless to say anything."

"Somehow I knew that'd be his reaction." Amy smirked, but then she saw in her peripheral vision that the fox boy was not alone. She noticed the flash of cobalt blue, and she turned around fast to see none other than Sonic the Hedgehog standing there, slackjawed in shock. "S-Sonic!" Amy exclaimed as her heart revved up. "You're here too! I-I um...I didn't think...uh...h-how do I look?"

The blue hedgehog remained silent, his eyes wandering up and down as he tried to process what he was seeing. "Uh..."

By now Tails was able to function again, as he looked over at Sonic with furrowed eyebrows. "Uh...Sonic?"

Cream just laughed. "Looks like it's working, Amy! I think Sonic's falling head over heels for your tits!" She suddenly smacked Amy's boobs, making them jiggle wildly.

"H-Hey!" Amy blushed at the sudden contact, as she turned again to see Sonic also blushing beet red, looking away and yet somehow his feet remained glued to the floor. "Sonic...say something, please?" Her tone was begging, she needed to hear that this was what he was looking for. Surely Cream's guess wasn't so off base? Her breasts had finally stopped growing, each one now reaching past her knees and supremely heavy. Only her hammer-wielding strength kept her from falling over. "I-If they're too small, I can make them bigger for you! Lots bigger! Please...just, give me a chance!"

Sonic squeezed his eyes shut, then forced himself to look straight into her eyes and not her boobs as he slowly went over to her. "I should have known...should have said this a long time ago, Tails was right...Amy, your...breasts...are very nice. But that's not the problem."

Amy suddenly felt extremely weighed down. "Wha...then what is it?"

"I'm not built for this relationship thing you want!" He shouted as his breathing became shallow. "You say you know me, but how can you expect me to just stop running and stay in one place to be your boyfriend?! That's almost as bad as being caged up! Running and adventuring is who I am! I can't give that up! Not for you, not for anyone!"

Cream stayed silent. She wanted to help but...she wasn't sure what to say. "Amy..."

"Um...s-should we...leave, or..." Tails trailed off awkwardly.

At first Amy felt like crying...but she quickly cast that aside as she put on a determined expression. "Is that what you think I want? All this time you thought I wanted you to stop being you? What on Earth would make you think that?!"

Sonic reeled back from her outburst, the tip of his foot accidentally grazing her left breast causing him to blush again. "S-Sorry! And also...y-yeah? I mean, isn't that what boyfriends are supposed to do? Tails practically spends every waking moment thinking of Cream nowadays."

Tails's ears flicked, hearing his name uttered. "W-Well...you're not wrong. But...that still doesn't stop me from doing what I've already been doing before. Right Cream?"

"Yeah!" Cream nodded. "I would never want to stop Tails from being...well, Tails."

"But Tails doesn't do what I do, he's always around one way or another. Me? I could be halfway around the world in a heartbeat, whether it's just to explore or kickin' Eggman's sorry ass before he can try and wreck the world again. I can't give all that up, and I can't ask someone to always be wondering whether I'll make it back or not. How's that fair to anyone?"

Amy shook her head, the movement causing her breasts to sway a little. "That doesn't matter to me at all! Oh god, Sonic, all this time I thought I just wasn't attractive enough for you! And it turns out you're just some twisted martyr?! I fell in love with you BECAUSE you are who you are! Why would I want you to throw all that away? Besides, I worry about you anyway, whether you're my boyfriend or not! Run all you want to, explore the world 20 times over...all I want is to be the one you come home to once you need a rest. My arms are always open for you...or uh...in this case, I guess my breasts can be a pillow for you now, heh."

Sonic blushed again at the implication and looked away, rubbing the back of his neck awkwardly. "Well...I uh...guess I pegged you all wrong, Ames."

"Aaaaawww! So sweet!" Cream gushed, but then blinked in realization. "But wait...I thought I heard you say something about wanting her to be super-duper busty the other day. What was that about?"

Tails suddenly tensed up and started sweating nervously. "Uh...y-yeah...a-about that....that might've been my idea..."

Amy turned her head to glare at Tails, then she looked back at the obviously uncomfortable Sonic, and then back to Tails again. "Wait...so you're saying, Sonic DOESN'T like super huge girls?" Amy turned back to Sonic. "Please tell me I didn't give myself yoga boobs for nothing!"

Sonic refused to look at her. "Well, I mean...I wouldn't...say it was for nothin'...me and Tails, we were...just, y'know, talkin'...typical guy stuff..."

"Yeah! Like...what if both your boobs got super huge,  ya know? And...w-well...uh..." Tails blushed heavily. Then suddenly he realized something as his head darted towards the blueprints from earlier. "Wait! Y-Y-You didn't happen to...s-see the blueprint, did you?!"

Cream smirked. "You mean the one for a super sized bra?"

Amy couldn't help but grin as she watched Tails's face practically lose all its color. "I knew you wanted to see her get mega huge! You pervy little fox you!" Then Amy turned to Sonic, inching closer until her breasts were pressed against his chest (as well as most of his torso). "What about you Sonic? Now that we've cleared up this little misunderstanding, think you can be man enough to admit you think these babies are sexy? I think they are."

"Puttin' me in a tough spot here..."

"Maybe stop stressing so much and just let go. I'm basically inviting you to play with my big, huge...MASSIVE tiddies..." Amy then felt a spark in her head, as she grinned and discreetly aimed the ray gun from underneath her breasts. "And did I mention...they're STILL growing?" She pressed the trigger, and instantly her already gigantic breasts began inflating further. "Admit it, you think this is hot, don't you?"

Cream noticed Amy blasting herself again and smirked. "Oh Tailsyyy!" She cooed. ”Are you just gonna let Amy and Sonic have all the fun for themselves? I wanna grow big toooo!"

"O-Oh! Uh...w-well uh...I-I think that extra raygun should be...almost finished. J-Just gotta test it first..."

Cream pressed her breasts against Tails and giggled slyly. "Well I think you got yourself a test subject riiiight here."

Tails blushed before looking over to Sonic. "I-I think we're gonna be here for a while..."

"Tails, we really doing this?" Sonic gulped nervously. "I-I'm not exactly good at this...stuff."

"Oh you don't have to worry. Just relax and let us take care of everything." Cream giggled seductively as she playfully patted Amy's growing breast. "Riiight Amy?"

Amy grinned and gave Cream's breast a squeeze even as hers continued to grow past yoga balls, practically overtaking her vision. "That's right, but you better hurry if you wanna catch up, my babies are getting preeeeetty big!"

Tails felt a rush go through him. "Be right back!" He hurried off to get the newly developed raygun.

"He's so adorable." Cream giggled.

"Isn't he though?" Amy turned to Sonic, who still looked distinctly uncomfortable. "Come on Sonic, stop looking like this is the worst thing ever. You have a gigantic pair of GROWING BOOBS right in front of you, and they're literally yours for the taking! I promise, this isn't a trap, there's not gonna be a ball and chain magically strapped to your ankle. Being my boyfriend isn't going to force you to stop being an adventurer. Think of this as..." Amy pressed her breasts up against him even more, and he was almost swallowed by her bare cleavage. "A brand new adventure!"

Sonic didn't move for several moments, until finally, he raised a hand and gently pressed it against her left breast.

"There, see?" Amy teased. "That wasn't so bad, was it?"

"For someone so adventurous and brave, he sure does seem helpless when it comes to this." Cream giggled teasingly.

"Me? Helpless?" Sonic smirked. "Now that sounds like a challenge!" Suddenly filled with a competitive fire, Sonic turned to Amy, whose breasts had now grown so huge that they were actually laying on the floor in front of her. "I gotta admit, I dunno what I'm doing really, but I'm gonna just go on instinct!"

Amy grinned in anticipation. "Then do it! Take me, I'm yours!"

Sonic's own grin grew determined, and without warning...he leaped into the air and began BOUNCING on Amy's breast. "Yo! This is actually pretty fun!"

Amy's jaw dropped, and then she smacked her palm against her face as she laughed. "Why am I not surprised? Well as long as he's having fun."

Tails returned, and the first thing he saw was Sonic bouncing on Amy's tits like a trampoline. "Oh...huh. Not what I was expecting to come back to."

"Heh, well you're free to do the same with my boobs once they're big enough." Cream winked at the fox. "You know you want to."

Tails blushed as he approached Cream with the new raygun. "W-Well uh...h-here goes nothing." He fired at Cream...but the ray also carried over to Amy as well.

Amy could feel the splash effect reach her, and she hummed with pleasure as she could feel her boobs restarting their growth once more. "Better not jump too high Sonic! You might bump your head on the ceiling if they get much bigger than this!"

Sonic yelped and landed on her tit, causing it to ripple hypnotically as she gave a happy moan. He realized that she was growing yet again, and his hedgehog heart started to race as excitement filled him in a way it never had before. "Geez Ames, how big are ya gonna get?"

"You tell me Sonikku..." She used her old petname for him affectionately as she jumped up to use her own breasts as a bed. "If you think I'm ever gonna reach a point where I think they're too big, think again...far as I'm concerned, they're microscopic."

Hearing her talk like that sent a jolt through Sonic's belly. "Then I guess ya better fix that! Wouldn't want my girl feeling small!"

Amy's eyes widened as she squealed at the top of her lungs and pressed the trigger multiple times in a row, causing her to grow five times faster than usual. "He called me his girl!"

"Oooh!” Cream exclaimed as she noticed the splash effect take place. "Decided you wanted both of us to grow, huh?"

"E-Eh?!" Tails gasped as he examined the ray. "I-It wasn't supposed to do that! It was only supposed to affect one person at a time..."

"Oh don't worry. I think this is perfect." Cream jumped with all her might towards Tails, trapping him underneath her massive swelling tits. "Now for the real fun to begin."

"W-Wha? Uh...o-okay..." Tails blushed as his hands instinctively started rubbing Cream's soft orbs.

Seeing Tails do it, Sonic decided to do the same thing while still on top of the rapidly growing mound of pink flesh...but with all the times Amy pressed the trigger on her own growth ray, it was growing faster than he could properly grope it...and not only that, it was starting to stretch across the room. "This is wild!"

"You ain't seen nothing yet!" Amy pressed the trigger AGAIN, and her breasts began swelling even faster, bumping into tables and other machinery which caused her to moan as the ever multiplying nerves reacted to the touch. "Come on, grow! I wanna be huge! These mosquito bites have to be big for Sonic!"

Tails, after seeing how big Amy has been getting, decided to shoot Cream again. Her bust started catching up to Amy's. "Mmmm!" Cream gasped out with pleasure. "Oooh yeah, that's it! More, more, moooore!"

"Eh heh...g-glad you're e-enjoying this." Tails rubbed her boobs lovingly.

By this point, Sonic felt he had to jump down before he got too close to the ceiling. "No wonder Tails is obsessed with Cream...this is awesome!"

As for Amy, she was constantly moaning now, her panties beginning to drip with her own aroused juices as she grew endlessly bigger. Minutes later, her right breast bumped into something else round and soft. "C-Cream? Haaaa....i-is that you?"

"Oh! Hah...l-looks like...w-we're both even now..." Cream said in-between pants. She too was dripping with arousal as her thicc thighs rubbed together while her breasts continue to swell.

"Y-Yeah...uh...I forgot to mention this new growth ray has a setting to adjust how powerful the growth can be." Tails spoke up.

"Oooh! Mmmm...y-you're a g-genius...T-Tailsyyy...OOOOH!"

Hearing that they were neck and neck when it came to size filled Amy with a competitive drive. "Y-You're not...not gonna outgrow me Cream! Sonic, press that trigger as fast as you can! You don't want her to be bigger than me do you?!"

Sonic caught the gun and looked at it, then he looked over at Tails who was still pinned underneath Cream's gigantic bosom and shrugged. "Sorry pal, but she's got a point." Channeling his speed into his finger, Sonic began spamming the trigger, the ray firing so fast that within seconds, 30 shots had struck Amy's breasts and caused an explosion of growth that caused them to nearly double in size within a minute.

"OHHHHHH MYYYYYYYY GOOOOOOOOOOOD!!!!!" Amy's breasts began filling the entire room, pressing against the walls, and Cream's breasts.

"Uh oh!" Cream smirked. "Looks like we're running out of room!"

"Uh...I-I think we'd better settle down then..."

"And let Amy win?! No way! Come on fox boy! Fill my milkers up!"

"U-Uh..." Helpless against the power of growing boobs, Tails pressed some buttons on his 2.0 growth ray to increase its power and shot at Cream. Her growth dramatically increased.

"O-OOOOOHHH!!! YYEEEEAAAHHH!!!"

Amy screamed for more hearing Cream start to catch up again. "Keep going Sonic! Don't stop! Bigger! Make me bigger!"

"Amy uh...seriously," Sonic replied. nervously. "We might blow the roof off this place if we keep this up!"

Somehow that only made Amy hornier. "That would be amazing! Come on, please! They have to grow faster! Cream's almost bigger than I am!"

"Mmmm! Better enjoy being biggest while it lasts." Cream started overtaking Amy. "Cause I'm gonna be the winner of this round soon enough!"

Tails stopped firing as soon as he saw Cream bigger than Amy. "S-Sonic, we might need to get out before we get squished!"

"Right there with ya pal, hang on!" Rushing over to yank Tails out from underneath Cream's tits, he tugged with all his might and finally managed to yank him free. "Alright, time to go!" Sonic took off out the door with Tails in tow, and stopped outside the lab which seemed to be...bulging from inside.

"I'm so big! I'm so incredibly big!" Amy drooled with desire. "But I can be bigger! Lots bigger! Come on babies, make Mommy proud! Keep growing!"

Cream's reaction was the same. "Mmmm! That's it girls! Just...a little mooore...oooh, so tight!" She moaned as her boobs pressed against the walls and Amy's tits. "Ooooh man! If I had known how good this would feel, I would've done this much sooner!"

The best way to describe their boobs at this point would be blimps. No other object came to mind that could truly define their size at this point. Yet Amy and Cream still craved more, their desire to be bigger never-ending at this point. "More...more!"

Meanwhile outside, Sonic was standing there with Tails, waiting for the inevitable.  "So...I know you mentioned they enjoyed this whole thing...but ya think maybe things have gone a little too far?"

"Well..." Tails scratched his neck awkwardly. "I did say the rayguns were still in the testing phases. I'm starting to think they might've had an unexpected effect on them." Then the workshop started to rumble harder as the walls began bulging out in all directions. "Uh oh! It's gonna blow!"

"Sorry about your lab buddy."

Back inside, the girls were pushing the walls of the lab to the absolute limit, all the objects strewn about the building now lost in a sea of swelling cleavage.

"I...have never...felt this good...in my whole life!" Amy gasped. "I don't ever want them to stop growing!"

"Mmm...me neither." Cream rubbed her swollen breasts...until they finally, slowly ceased their growth. "Oh? Aww, it stopped..."

"Aww, too bad." Amy grinned. "Guess I'm the biggest after all! Thank you Sonic for your super speed trigger finger!" Amy soon left Cream's size in her dust, her breasts pressing hard against the walls and even the ceiling now, as her growth showed no signs of slowing. "Big as the workshop?! That's thinking too small!" Debris started to fall. "I say..." Cracks formed in the structure, and moments later, it all came crashing down as Amy's boobs outgrew their confinement, Cream's much smaller boobs being dwarfed by their growth. "Outgrow the whole dang city! These tiny tiddies of mine have some serious growing to do!"

As Amy's massive bust busted out of the building, Sonic, Tails, and Cream were all left to watch in awe as she continued to grow and grow. "Uh, Tails?!" Cream shouted out, to no avail as Tails kept staring, speechless. "Tails?!"
Sonic elbowed the fox boy. "Hey pal...your girlfriend is trying to get your attention."

"H-Huh?! Oh! Cream!" The fox boy flew over to Cream, who was laying on a mountain of her own flesh. "A-Are you okay?"

"Oh I'm just fine...but Tails, as wrong as this sounds coming from me, I think she's getting a little too big. Should we get her to stop?"

"You're right...it does sound wrong coming from you, considering your motto is bigger is better."

"It still is, don't get me wrong!" Cream exclaimed. "But...I think something went wrong with the rays, we kinda lost control..."

"I...I did notice that." Tails nodded slowly. "Alright...just...give me a sec." He looked at his 2.0 raygun to adjust its settings. "Amy's not gonna like this."

As Amy's growth continued unimpeded, she looked around from on top of her humongous fleshy orbs with an excited giggle. "So awesome! I can see for miles from up here! Look at me Sonic! Your girlfriend has the biggest boobs in the world! And they're STILL growing!"

"Uh, sorry to burst your giant bubbles, but..." With the adjustments made, Tails fired the raygun at Amy to cease her swelling.

Amy shivered as a cold feeling swept over her whole massive body which was 99% breast, and suddenly she paled as she realized her growth had come to an abrupt halt. "Hey! What happened?! You can't stop now! I'm still practically flat-chested! Grow! Grow! GROW!"

Sonic ran up the mountains that were Amy's breasts, losing his footing as the wobbling of the terrain forced him to slowly crawl over to her actual face. "Ames, snap out of it! Look at yourself! You just burst through Tails's lab!"

"And?! That's a tiny building anyway!"

"Amy...think for a second. Just breathe, and think."

"I don't wanna think." She crossed her arms and pouted. "I wanna grow, for you! You can't tell me you don't like big boobs!"

"No...definitely can't say that...but you've gone crazy with this! You can't even walk like this!"

"So? My boyfriend is the fastest thing alive! You can make sure I'm taken care of, food and water so I can focus on growing!"

Sonic frowned, his eyebrows furrowed. "So you want me to stay here forever and just take care of you and your chest?"

It was at that moment that Amy realized what she was suggesting, and she began to tear up as her bottom lip quivered. "No! Oh Sonic, I'm sorry! I don't know what came over me! Please forgive me! I didn't mean it!"

Sonic smirked. "I know you didn't. Had a feeling you weren't playing with a full deck."

Tails flew up and landed beside Sonic. "Well, seems like I still need to work on these rayguns. Seems to have a mental effect on its targets. Hopefully it shouldn't take too long to fix."

Amy looked around, this time with a more sober state of mind. "Wow...I really am HUGE huh? Can't believe I thought I was small like this!"

"Well...not gonna lie..." He whispered in her ear. "It was kinda...sexy, I guess, to hear you talk like that."

Now Amy smirked. "So Cream was right, you DO like ridiculously extreme sizes."

"Maybe in...short bursts."

Tails shook his head and chuckled. "Well, I can at least shrink them down to a more manageable size. Either back to the size you were before, or slightly bigger. Whichever you'd prefer."

"I think we all know what that's gonna be, Tailsy!" Cream shouted from below.

Tails blushed.

Amy pouted. "Aww, does it have to be only slightly? How about...beach ball size? Eh...OVERINFLATED beach balls. That should be big enough! Unless...you think that's too small Sonic."

Sonic put his hands up. "That's definitely enough if we're talking default!"

"I think it would be best if I gave Amy only a marginal boost for now. I don't know if the ray had an effect on the natural development and hormone balances of your bodies." Tails said as he put his foot down. "A few cup sizes smaller than Vanilla, that's my final offer."

"Fine." Amy sighed in defeat. "And what about you Cream? You can't tell me that after all this went down you don't want a huge pair of knockers to go with that booty of yours. AT LEAST bigger than your mom."

"Well..." She looked at her bust and rubbed it softly, the feeling of being huge tempting her to forgo her natural growth vow. But she steeled herself, and looked up at the large mountain of pink flesh with determination blazing in her eyes. "As much as I love being this big, I want my growth to be natural! I feel like I'd be betraying myself by letting Tails give me a permanent boost before the day I stop, which hopefully I never do." Cream nodded sagely. "Put me back to normal Tails, same size as I was before."

Tails flew over to land on his girlfriend's bust. "You're sure?"

Cream nodded again. "Positive."

"Well alright then." Tails flew up again and took aim. "You girls ready for shrinking?"

Amy made a face. "Ugh, shrinking. Just realized how much I hate that word. But alright, fine."

"Sorry girls. But it's for the best." Tails fired the ray at both Cream and Amy, and instantly their breasts began shrinking as they both started getting lower to the ground.

"Ooh! T-This feels...different." Cream shivered. "Well it was fun while it lasted..."

Amy's vantage point slowly lowered as well, the cold feeling of shrinkage causing her to shiver as her breasts contracted, finally, to a mostly reasonable but still quite large size, very close to Vanilla's massive bust size. The pink hedgehog stood up, hefting her tits with a somewhat melancholy expression. "Well, these are okay I guess. Gotta admit though, once you've gone extreme, it's hard to go back."

"Well hey..." Sonic walked up to her, discreetly holding the old size ray. "No reason we can't have fun another day."

Amy grinned. "I think you're getting the hang of this."

Cream giggled as she witnessed the exchange between Sonic and Amy, and she wrapped an arm around Tails and held him close to her. "Guess you're not the only one who's gonna have their hands full of boob from now on, huh Tails?"

"Heh...l-looks like it." He blushed embarrassingly.

"Still can't believe you decided to shrink all the way back down Cream." Amy said as she eyeballed the size that Cream stopped shrinking at, but then she smirked, as she swore she could see a very slight jiggling of Cream's bosom, almost as if...no, it couldn't be, she decided. "I respect your decision though."

"Thanks Amy." Cream replied as she hugged Tails lovingly, her now back-to-normal tits pressing tightly against his chest, making him blush hard. "I'll catch up to you and Mom someday, and that's a promise."

Amy was about to reply, when she again noticed that Cream's breasts seemed to be ever so slightly swelled up from a moment ago. She giggled at that. "Oh I'm sure you will Cream, and I bet it'll be sooner than you think."

"Well," Sonic spoke up. "Guess this was definitely an adventure, hehe."

"Told ya so." Amy grinned and wrapped her arms around Sonic's neck, a loving spark in her eyes as her upgraded boobs pressed into his chest. "So where do we go from here?"

"That's the real beauty Ames..." Sonic replied. "You just never know, that's why I live the adventure of life!"

"Sounds like fun...just promise me you'll let me live it with you."

"Sounds like a plan to me."