"Heh, looks like I'm just destined to defeat you..."
Buu clenched his fists and his teeth at the saiyan's declaration, shaking with rage. Yet, it wasn't just rage, was it? Something else was nagging at the majin, something somebody as powerful as he was simply should not be feeling at all: Fear.
Even Buu had just admitted that Vegito was toying with him, holding back his power in their fight. And yet the fused hero had already torn his body apart, beaten him to a pulp, and even deflected the massive energy orb he'd thrown his way into space. Buu had to wonder, if an attack powerful enough to destroy the planet couldn't even scratch this newly forged warrior, what could? How powerful was he at this point?
How powerful would he be if he became a super saiyan.
Buu trembled as he saw small arcs of static ripple around Vegito's body, then felt a slowly growing surge of power coming from the warrior. It was as if the villain's worst nightmare was suddenly coming true.
"No... you can't..." Super Buu snarled under his breath.
Vegito only smirked as his power level continued to rise, "Sorry Majin Buu, but you know what happens next. Heh, you couldn't even touch me before, let's see how long you last when I take this to the next level!" The saiyan chuckled arrogantly as the sparks around him began to intensify, energy surging from his body now, "Maybe if you had trained more instead of stuffing yourself with sweets, you wouldn't be so pathetically out of shape. Guess you just can't win, can you?!"
Buu growled with fury at Vegito's words, but as he thought them over, his snarl turned into a devious smirk, "And maybe if you had kept that cocky mouth shut, you wouldn't have to eat your words..." He laughed, his body beginning to twist and melt before the saiyan's eyes, "And so much MORE!"
Vegito's brow furrowed in confusion, before the fused saiyan gaped in shock as Majin Buu's amorphous body began to liquify and soar into the sky. The ear-splitting howl did little to help the hero process what was happening as he watched the majin's now ribbon-like body curl weightlessly through the air, Buu's facial features stretched and deformed into a ghastly, leering visage, making the monster look like some kind of hideous snake.
As Vegito continued to watched, stunned and grunting in confusion, Buu's scream suddenly grew louder as the ribbon of thick, pink slime suddenly turned straight towards the saiyan and plunged swiftly towards his open mouth. By the time Vegito had finally realized what was going on, it was far too late, Majin Buu plunging straight past the saiyan's lips as he tried to close his mouth. Despite the hero's immense strength, the flow of pink demonic slime was far too forceful for him to block, Buu already surging down the saiyan's throat as he was left helpless to defend himself against the creature's latest attack.
The only thing that Vegito could hope to do now was stand still and take the full brunt of Buu's oozing body down his throat, the saiyan warrior cringing with pain and absolute disgust as he felt the majin reach his stomach, forcing it to fill and bulge and swell outwards with rubbery, heavy slime. First Vegito's stomach only curved outwards, almost invisibly under his spacious gi, but then the curve turned into a dome, and then a swelling, sagging spherical gut as his blue and orange clothing began to cling and stretch around it. Even as the saiyan's stomach started to grow painfully tight, his gi clinging so tightly that every last curve of it was visible, Buu continued to pour into his body. Vegito swallowed gallon after heavy gallon of Super Buu's liquified body, his throat bulging with every painful gulp as the deadly monster continued to fill the saiyan's bloating stomach.
"Yes, that's it Vegito..." Majin Buu thought to himself, overjoyed at how easy this was, "Eat... eat! Eat until you pop, eat until you EXPLODE!"
Even as the pain in the saiyan's now monstrously distended gut became unbearable, he was unable to focus on forming any kind of resistance to Buu's attack. The flow of heavy pink sludge forcing itself into his mouth seemed absolutely endless, filling his throat so thickly that Vegito couldn't even cry out, his shouts muffled into pitiful, heavy gurgles against the unrelenting stream of Buu goo.
Just as Vegito felt like his stomach would finally give out, he began to feel the torrent of slime invading his esophagus slow somewhat, as though Vegito's stomach, now absolutely filled to capacity, was forcing it to back up. The helpless saiyan gripped his titanic orb of a belly, the immense size of it only filling Vegito with more dread as his gloved hands rubbed its tremendous curve in an almost futile attempt to soothe the pain. Fortunately for the overstuffed saiyan, that pain was starting to recede, a wave of relief spreading through the hero's panicked mind as his belly began to churn and gurgle loudly, and thankfully started to shrink somewhat.
Unknown to the saiyan, it seemed that his gut was simply too strong for Super Buu's attack, forcing the invading creature to spread himself throughout other areas of his defenseless opponent's body as the slime continued to infiltrate him. Now every last part of Vegito was open to Buu's insidious goo, and not a single inch was spared as the saiyan was forced to swallow every last bit of Buu's rubbery body.
A horrible discomfort began to fill Vegito's athletic body now as he felt the slime invading him begin to slip into other areas through his stomach. As the mighty saiyan warrior was essentially forced to digest his brutal enemy, he could feel his once toned muscles start to soften and swell. His arms began to thicken and bloat now, the visibly defined muscles beginning to vanish under a thick and heavy coat of blubber. Likewise, the saiyan's beefy thighs were overcome with flab as Buu filled them as well, moving down and through them in order to fatten the warrior's powerful legs. Roll after roll of backflab began to form on the saiyan's backside, drooping down towards his glutes, the hero's once perfectly toned posterior muscles surging outwards as they filled with Buu's slime, causing them to sage and thicken and bloat horrifically. Even the fusion's pecs weren't spared as they began to engorge and then sag, bloating into a heavy set of moobs that now drooped over his still distended stomach.
The hero's belly had already borne the brunt of Buu's sadistic attack, but even then, the monster wasn't done with it. The pain that had once filled the hero's bloated stomach was now for the most part gone, his belly no longer taut and forcibly stretched to its limits. Instead, it too began to sag and fill with Buu's invasive slime just like the rest of Vegito's body, drooping and folding into rolls of blubber that ringed around to reach those weighing down the fusion's back, his lower gut rippling with cellulite as it began to crease down the middle, a nice, deep fold that ran up towards his belly button.
The whole time Vegito's body was forced to undergo this sickening transformation, the saiyan's poor blue and orange gi was constantly struggling to contain his now obese form, even as it continued to swell and sag with fat. After having put up with his belly's initial inflation, the saiyan's top was now straining to contain both his distended gut, the now doughy layer of fat piling on top of it, and all the lard that was accumulating on his arms, chest, and back. After what seemed like an eternity of valiant struggle, Vegito's top finally gave out, small rips rapidly tearing over the blue fabric across his belly, exposing the orange undershirt beneath that was quickly tearing apart as well. As the rips widened with alarming speed, until the saiyan's firm cloth belt and both shirts finally gave out, one after another, until Vegito's titanic belly and gargantuan moobs spilled out of the failing garment in a naked sea of fat.
By now the once mighty and athletic saiyan hero looked as though he was morbidly obese, his gi tearing apart at the arms as his flabby, sagging bingo wings burst free. Even now, Buu's assault on Vegito's body seemed unending, gulp after fattening gulp of liquified ooze filling Vegito's gravid stomach, thin cascades of pink slime dribbling past the hero's plump lips. The streams of Buu rolled over newly formed triple chins, dripping onto the saiyan's sagging man boobs before the sentient goo simply crawled its way across his flabby chest and snaked into his thick, bulging nipples to join the rest of Buu's parasitic mass inside of the saiyan.
Despite his top tearing and the tremendous bulk of his rapidly swelling body, Vegito's pants continued to hold strong against the surge of ass and thigh flab that was straining them. The blue garment was of little use in obscuring the hero's newly fattened form however, the fabric stretched thing over his bulging, bloated buttocks and soaked in sweat, leaving very precious little to the imagination. Even the hero's crotch wasn't spared from Buu's attack, and Vegito was thankful that the tightening bulge in his pants was almost completely obscured by his doughy, fleshy apron of a belly. Or at least, the saiyan would have been thankful had he not been distracted by more pressing matters.
The pain in Vegito's belly had resurfaced now as the ooze still making its way inside of him began to fill and stretch it once more. The fusion's once deep naval began to grow shallower as the goop filling his gut started to strain it so much it grew into a thick outie belly button, the deep crease on his underbelly too starting to shrink from all of the swelling. The hero's once more straining gut began to pulse and throb with every thick gulp he swallowed, the now fully exposed belly's skin growing slightly red from the strain. Thankfully, the last of Majin Buu was finally curling toward Vegito's mouth, and after what seemed like an eternity, slipped past his plump lips with a sickeningly wet plop.
The battlefield had grown completely quiet now. Only one warrior seemed to be left after what had happened; His opponent gone; His body deformed into a hideous, disgusting parody of obesity.
As soon as Vegito's throat had cleared completely, the now titanically fat hero began gasping and wheezing for air, sweat dripping down his moobs and across his sore, humongously distended belly as both jiggled and shook, rising and falling with every strained breath the once fit warrior took. Once he had finally regained his breath, the only thing the tremendously over-engorged and overstuffed saiyan warrior could say to such a bizarre and terrifying situation, his voice husky and deepened heavily by pound after pound of pure blubber, was a single, astonished sentence:
"What the fuck..?"