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Note: This story contains breast expansion, read at your own risk

The crowd went wild as Robin appeared on the battlefield in a flash of light. She looked around to admire the stadium full of fans that surrounded the arena, and waved to them, receiving plenty of cheers in response. It was her third match in the Smash Brothers Tournament, where every generation fighters from all corners of the world met to fight for fame and fortune. Simply being accepted into the tournament at all was practically a gold ticket to stardom, with many of the fan-favorite fighters being contacted by famous developers to produce games based on their adventures even if they lose in the end. Even though she was a newcomer to this year's tournament, Robin had gained popularity pretty quickly, already outranking some of the less popular returning fighters. She enjoyed her time in the spotlight, drumming up the audience as they chanted her name. Then, having entertained her fans enough, she turned to face the other side of the arena just in time to see her opponent.

The cheers were almost deafening as Palutena stepped into the fray, her long green hair flowing in the wind behind her. "Oh, great... It just had to be her, didn't it?", Robin muttered to herself as she glared at Palutena, who was already busy entertaining her fans. She was new to the tournament as well, but she already had easily double Robin's fans, and was steadily rising. I can think of two good reasons why, too, she thought to herself as she watched the goddess's sizeable rack sway from side to side within her flowing white robes as she jumped and waved at the crowd. She didn't have time to think much more, however - as she heard the announcer begin the countdown, she readied herself for the fight ahead.

3... 2... 1... GO!

As the fight began, both fighters quickly sprinted towards each other. Robin's thunder spell was easily neutralized with a wave of Palutena's staff, and she followed up with a swing of her sword. Palutena grunted as she met the blade with her staff, and the two fighters struggled in a deadlock, each glaring at the other. "You'll have to be faster than that if you want to win this!", Palutena taunted. "Maybe you should try taking off that big coat of yours? Or are you trying to hide something?"

"You're one to talk!", Robin retorted. "How do you even fight with those things flying around?", she said, glancing towards her chest. "Oh? What's wrong - are you jealous? These are the sign of a goddess!", she said as she teasingly eyed Robin's chest. "Though I guess I can understand why you'd want to cover yours up, little girl - not that there's much to cover!", she continued with a laugh. Robin's face went flushed. She knew she wasn't particularly big, but she wasn't that small, was she? "As if I'd want any more than this, you cow!", she replied louder than she had intended. Palutena took advantage of her embarrassed state and quickly pushed forward, breaking the deadlock and sending Robin flying backwards.

That witch! She thinks she's so perfect, doesn't she?, Robin thought to herself as she recovered. As she stood up, she felt something brush against her foot, and she looked down to spot a mushroom sliding across the battlefield. Perfect! Now I'll show her for sure! She picked it up and took as big of a bite as she could out of it, and waited a moment. She had seen other fighters eat these before, but they always seemed to see the effects instantly, growing to almost twice their normal size - had she done something wrong? How complicated could it be?, she pondered - when suddenly, she began to feel a weight in her chest.

Palutena was watching in fascination as the young brawler's flat chest began to round out, pushing forward inch after inch in rapid bursts. After four quick growth spurts the growing fighter looked down just in time to see the small rope fastening the front of her coat snap, letting out a squeal as she came to terms with her predicament. "W-What's going on?! This isn't supposed to happen!", she exclaimed, refusing to believe what she was seeing. Palutena was more than thrilled with this turn of events. "Hahahaha! Who's the cow now, 'little' girl?", she chided as Robin's chest finally settled down, stopping at an E cup and visibly surpassing Palutena's own bust. The crowd decided to throw in their opinion, eagerly chanting Robin's name, and she gripped the sides of her robes and pulled them tight around her to cover her straining shirt. "You perverts!", she yelled towards the whooping crowd, her face red with embarrassment. Palutena decided not to waste this opportunity, and before Robin could react she was already beside her.

"What's the matter, Robin? I thought you wanted this kind of attention!", she said as she pushed the young fighter to the ground, holding her against the ground with one knee as she knelt beside her. "In fact, why don't we give the crowd more of what they want?", she continued, holding the mushroom over the helpless fighter's face and pulling a sizeable chunk out of it. "Now open wide!", she teased, waving it in front of her mouth.

"You wouldn't dare, you- Mmmph!", Robin exclaimed, her words cut off by the large piece of mushroom jammed into her open mouth. She felt the reaction much quicker this time, her wobbling chest growing upwards at an alarming rate. The stands were alight with excitement as the seams along the middle of her shirt were quickly torn away one after the other, exposing her now HH-cup breasts to her fans. "I never knew fighting could be this fun! I should've joined this tournament 25 years ago!", Palutena exclaimed between laughs. She was so busy laughing that she didn't notice Robin's thunder spell flying towards her, tossing her several feet away. Robin struggled to recover under the weight of her breasts, but finally managed to reach a standing position, albeit leaning forward under the weight of her new tits. "Now let's see how you like it! Expand!", she exclaimed, sending a beam of light from her tome that nailed Palutena in the chest.

Palutena stumbled from the spell's strike, a wave of heat quickly flowing over her body. Soon another wave followed, more powerful than the last. She quickly noticed her already-tight robe straining around the chest region, slowly being pushed forward as her chest swelled. From behind she felt her modest rear pushing against her waist straps, growing more uncomfortably restricting with each passing moment. "W-What kind of a spell even is this?", she yelled as another wave of warmth spread over her, her bust quickly matching with Robin's as her robe quickly lost any modesty it once had, slowly creeping downward until finally it was only clinging to her flushed nipples and displaying an enormous expanse of cleavage above her stiffening nubs. "You think this is going to stop me? I was busty before you were even born, you little runt!", she cried out, feeling one of her waist straps break under the pressure of her growing ass as she carefully moved towards her opponent. As they noticed the mushroom on the ground, they each ran towards it, both grabbing it simultaneously and splitting it down the middle - both fighters falling tits-first, in their haste.

In perfect synchronization, they both launched their attacks. "Take this!", they both cried as each fighter shoved their handful of mushroom into the other's mouth. Startled by each others' reactions, they both instinctively swallowed.

"Aah! You witch!", Robin exclaimed, the first of the two to regain their wits as her breasts billowed forward. She quickly took the initiative, straddling Palutena's stomach and preparing a second spell. "Expand!", she cried, only then noticing Palutena's staff glowing. "Reflect!", Palutena countered, the beam of light bouncing back and nailing Robin in her already massive rack. The two spell-struck fighters gasped as waves of heat spread across their bodies almost simultaneously, their assets becoming more and more voluptuous in the process. Palutena grinned as she felt Robin's backside swell against her, and reached upward, abandoning her staff beside her. Before Robin could tell what she was doing, she felt the goddess's hands grip her swelling chest, roughly groping and teasing her breasts and drawing several loud moans from the swelling young woman. What is she trying to do?, Robin thought to herself, struggling to keep her composure. And why does it feel so... nice? Palutena easily overpowered her, pushing her to the ground and moving on top of her - Robin far too dazed to resist. Palutena's own rack finally escaped the confines of her top altogether, slowly swelling downward while her rear only blossomed further into the air, more and more toned flesh becoming visible to the speechless audience. Smiling at her new changes, she continued her assault, pressing one knee into Robin's drenched crotch while kneading and squeezing her swelling melons. She didn't know why, but she couldn't help but feel like she was starting to get into this...

Robin couldn't help but scream as she felt the pressure of Palutena's knee rubbing against her womanhood. She felt herself wagging her expanding hips back and forth, grinding against her enemy. Her whole body was on fire, and the only sounds she could make were a chorus of panting and moaning as she endured her assault. As her rear continued to swell underneath her she felt her panties tightening against her crotch, only teasing her more and more. Finally she reached her limit and erupted, spilling hot woman-fluids like a waterfall and drenching both Palutena's leg and the ground surrounding it.

"You came just from that? You need more experience!", Palutena remarked, wiping her knee clean as she remembered where she was. She stood to the best of her abilities - a task made difficult with her beachball-sized tits dangling from her chest - and faced the crowd eagerly, showing off her new assets and bathing in the crowd's adoration upon her victory. It was a bit of an unorthodox way to win a battle, she mused, but I guess all's fair in love and war, right? She looked down and checked her new body, admiring her curves on each end. I'm not sure how I'll manage to fight next time, though...

Her thoughts were interrupted by a unanimous gasp from the audience, and the next thing she knew she was falling to the ground. She opened her eyes just in time to see Robin on top of her, the recovered fighter's enormous rack squeezing tightly against her own. Before she could react, she felt her arms wrapping around her neck, and her eyes widened as she was locked into a tongue-filled kiss.

As Robin held Palutena close with one arm - or at least as close as she could, given their enormous tits - she reached down to her former opponent's crotch with the other, quickly worming two fingers past the goddess's thong-like underwear and deep into her wet snatch. Palutena's eyes fell into a lust-filled gaze as they shared their passionate kiss, and lifted her hips against the intruding fingers as she moaned into her lover's mouth. The crowd was silent as a mouse as they all watched breathlessly, not wanting to interrupt this scene before it was over.

Finally breaking away from the kiss, Palutena screamed with pleasure as she came, her soaked crotch tightening against Robin's fingers as her cum began to flow. After taking several moments to recover, she pushed Robin to the side, rolling on top of her and taking the lead. "You... You're pretty good at this, for a little girl...", she said in between deep breathes. Her lips hungrily latched onto one of Robin's stiff nipples, sucking and licking all over her swollen teat while slowly groping the other with one hand. With her other hand she lifted one of her partner's legs and wove hers underneath, both fighters feeling waves of blissful pleasure flowing over them as they grinded against each other. Robin was helpless to do anything but hold Palutena as tightly as she could and scream with pleasure, her mountainous breasts turning into massive centers of warmth under Palutena's attention. Finally they both reached their limits once more, and they both cried out as their legs locked together and soaked each other with their cum.

As the two fighters sat up, they realized they could do little more than that - their chests were each large enough to fill their entire lap, and their enormous rears spilled out behind them. "Oh, right... Oops!", Robin muttered to the buxom beauty beside her, before grabbing her tome. "Reducto!", she cried out, pointing at Palutena and watching as with a blinding flash her assets began to swell back to their previous, more manageable size. Then she casted it on herself, feeling a tinge of regret as her chest dropped back to its usual, unremarkable size. Before she could finish the thought, however, she felt Palutena's lips against her cheek. "Don't feel too bad, 'little girl' - I'm sure we'll make them even bigger next time, won't we?", she said with a wink, as the crowd exploded into cheers.