A wonderful picture by  hectorthewolf of a fat Scar inspired me to write a story: an alternate telling where Scar's reign leads to an interesting mindset, and a vengeful Simba turns it around on him. Hope you like it!

Check out my inspiration here: http://www.furaffinity.net/view/9758900/

It had been a few years since Scar drove Simba away from the Pride Lands and he established his rule. None of the lions were excited about his reign, or sharing their lands with the filthy hyenas, but leave it to the deceptive, treacherous brother of Mufasa to eschew their concerns and begin ruling the Pride Lands.
His first order of business was to ensure that the biggest, most savory bits of prey were brought to him for “inspection”. Every time his subjects would return with the biggest pieces of prey, he would take one for himself for immediate eating and store the rest in a secret cave. See, he knew that with the way his kingdom now hunted, the animals would flee to parts unknown, too far for the lions to prowl in. He had been preparing for that ever since, making sure that when his kingdom went hungry, he wouldn’t. Years of stockpiling food had led to a cave filled with the biggest pieces of meat that he kept cool for when he needed them.
Of course, Scar still concentrated on the now, keeping himself well-fed and satisfied to last the day. He had gained quite a bit of weight in these last few years, which only recently began to show.
One morning, Scar awoke rather late and very slowly, at that. He struggled to his feet as he looked to his underbelly, which practically hung off his body as a spherical burden, dangling underneath his legs. He lifted the slightly swollen gut and patted it.
“My, my,” called an annoyed bird trapped inside a ribcage. “Someone’s put on quite a bit of weight, hasn’t he?”
Scar jerked his head up and looked to Zazu, who wore a sarcastic, yet slightly morose grin on his beak.
“It’s not very good for a king,” he emphasized with a sarcastic malice, “to be so fat and lazy, is it?”
Scar rushed up to the cage and spoke with a snarl in his voice that sent Zazu cowering to the back of his cage.
“What,” Scar began, gritting his teeth, “Did. You. Call. Me?”
“N-n-n-n-n-nothing that wouldn’t serve only to flatter you, your m-m-m-majesty…!”
Scar’s snarl curled into a smile that would only be used when triumphing over someone inferior.
“That’s what I thought. A lesson you should learn if you want to survive as my loyal servant, Zazu: Kings are not fat. Why, there’s simply more of me to worship. Is that not delightful?”
“I couldn’t think of anything more fulfilling,” Zazu droned, the sarcastic veil over his imprisonment back in full force.
“Oh, Zazu, I do wish you would cheer up. After all, this,” he gestured towards his distended gut, “is a result of how well my kingdom has been doing serving their king. I am fed and full and…quite famished, actually.”
“That’s surprising, considering you’ve already eaten a third of the kingdom.”
“Perhaps I feel like toucan for breakfast.”
“W-w-which is simply a testament to your well-being, your majesty!”
“Then again, gazelle sounds quite appetizing. I shall return momentarily.”
Scar walked his way back towards the rear of his cave, just out of sight for Zazu.
“Where on earth does he go when he’s hungry?” he asked to no one in particular. As he sat in thought, Scar shortly returned with six slabs of meat in his jaw, which he dropped on the ground.
Zazu stared at the meat in shock.
“And where does he get his prey all the time!?” he thought. “He’s barely been gone for 10 minutes, and he’s already back from his hunt with food!”
Scar stared at the succulent meat before him, smacking and licking his lips in ravenous anticipation. He figured that since the kingdom was already in the midst of a food scarcity, he should dip into his private stash for a bite or six.
“Ah, a breakfast fit for a king, eh, Zazu?”
“Y-yes, sire, but don’t you think that the rest of your kingdom could benefit from sharing such a haul?”
“Silence, you featherbrain! I’ll eat as much as I like! I am the king, after all, and I can do as I please! If I want to have all of this delicious food for myself, then I’ll be happy to indulge myself!”
Without another word, Scar went to work on the food, savoring and gulping down each bite. Every bit of food plopped into his stomach as if they were being dropped into a bag. The bag that was his stomach began filling out under him, almost brushing the ground. It began growing against his legs, which were practically sinking into his growing gut. Zazu watched in scared astonishment at Scar practically gaining weight before his eyes, his stomach becoming rounder and softer with each gulp. Even his legs and rump began to soften and plump as he continued to eat. When he was finished, he fell with his back against a wall, his tongue hanging out and his breath coming out in pleasured sighs. He put a paw to his ball of a stomach, patting it contentedly. It felt tight, yet bouncy to the touch. He gave out a long, satisfied belch.
“That was quite a meal,” he sighed.
“What a glutton,” Zazu groaned.
“This is how a king should live,” Scar declared, slapping his jiggling gut proudly. “Having his desired fulfilled, his simplest whims indulged, and his belly nice and full! I couldn’t imagine why Mufasa would want to remain so thin! The more meat on your bones, the more image you project onto your subjects!”
“I’m quite sure there’s a difference between showing of oneself and making yourself big enough as to not be missed by anyone,” Zazu muttered.
Scar sighed contentedly, still patting his belly.
“I believe I’ll sleep this off before I check in my people. A king has to be well rested before he walks among the commoners, after all.”
“I don’t think you’ll be doing many kingly things anymore,” sounded a heroic voice from the cave entrance.
“Hm?” Scar moaned in annoyance, rubbing his full belly. “Who could that be?”
Suddenly, a great lion bearing a striking resemblance to Mufasa entered the cave. Scar stared in astonishment.
“It can’t be! Mufasa!?”
“No. But you might remember me as his son, Simba.”
Scar’s jaw dropped and Zazu began hopping up and down in his cage.
“Simba,” Zazu exclaimed. “Is it really you?”
“You bet, Zazu, and I’m here to reclaim my throne.”
“But you’re supposed to be dead! Scar…!” the sudden realization of Scar’s words all those years ago struck Zazu like lightning. “…Scar told us as much.”
Scar could feel the heat rising in his neck. All he could do was manage an awkward smile and giggle, as if this were a problem that simply apologizing would fix.
“I…” Scar began, “…may have exaggerated the truth a tad.”
“Scar,” Simba began with a growl, inching closer towards Scar “When I get my claws on you, I’m gonna—hm?”
Simba hadn’t fully seen Scar as he was obscured by the cave’s darkness. With Scar in full light, Simba could see the state he was in. His belly was practically spilling into his hind legs, filling out the space between one leg and the other. His eyes circled Scar’s rounded frame, noticing that lovehandles on his sides were threatening to smother his thighs had they been given just a bit more mass.
“Simba…I suppose I now have the chance to kill you myself!”
Scar rolled onto his belly to position himself for battle, but found that instead of his legs, his belly was the one keeping him suspended. His legs could barely brush the ground what with his rounded belly in the way.
“Wow, Scar,” Simba remarked. “You’ve really let yourself go, haven’t you?”
“Let myself go!? This is me practicing my rights as king! He’s supposed to indulge and have his every command obeyed! He’s never supposed to go hungry and must always be satisfied!”
“Oh, Scar, it’s that kind of thinking that makes you so unfit for the throne.”
Scar noticed movement behind Simba, which came in the form of the lionesses in full support of Simba, staring down the deceitful Scar. Instead of anger, however, they found themselves laughing.
“Look at how big he’s gotten!”
“He can’t even move with that big belly of his!”
“Do you think he’ll eat me if he got the chance?”
“He’d have to get up first! Fat chance of that!”
Scar was mortified at those who were once his subjects mocking him. He found his head sinking behind his belly before Simba forced him up.
“I’m dethroning you, Scar, and my first order of business is punishing you for your crimes!”
“Simba, your highness,” Zazu began, “If you’ll let me out of here, I believe I have something to show you!”
Simba removed the cage from over Zazu’s head, letting him free to spread his wings. After a nice stretch, Zazu guided him to the back of the cave, which housed a secret passageway.
“Wait! Don’t go in there,” Scar exclaimed.
The two of them went through, ignoring Scar’s cries, and found his secret stash of meat piled high over their heads. They stared at it in awe, and Scar at them in horror, having discovered the stash he had been keeping full for years now.
“I knew it,” Zazu proclaimed. “Scar’s been hording his own food ever since he began ruling! That deceitful, lying, no good—”
“Now, hold on, Zazu,” Simba interrupted. “Scar may have just done us a huge favor with this.”
“Has he?”
“Have I?” Scar asked in surprise.
“What could you be thinking, sire?”
“Well, as soon as we drive the hyenas out, the prey will start returning to the Pride Lands, and we’ll have some good hunt prancing around again.”
“I fail to see your point.”
“Scar saved all this food for himself, didn’t he? It would be a shame if all of this hard work were wasted.”
Simba began whispering in Zazu’s ear, too low for Scar to hear from where he was. Zazu began giggling at Simba’s words.
“Simba,” Scar called, “What are you planning over there?”
Simba and Zazu went over to Scar. Zazu perched on the apex of Scar’s belly and Simba prodded the soft protruding gut, as if to test it.
“What are you two doing?” Scar asked with a shiver in his throat.
“Well, you wanted all this food, right?” Simba asked.
Scar shifted in his seat, glancing back and forth at the two animals who were now wearing sinister grins.
“Then you’re going to get it,” Simba said slyly.
Simba took a huge slab of meat and crammed it into Scar’s mouth, filling out every inch of space in his maw and puffing out his cheeks. Scar whimpered nervously.

Two cubs were playing at the base of the Pride Lands. Months had passed since Simba reclaimed the throne and his kingdom was already healthy and thriving again. As to what happened to Scar…
“Hey,” one cub began to say, “Do you wanna go play with the ball?”
“That sounds fun! Let’s have Zazu take us!”
The cubs tracked down the blue toucan just outside Simba’s cave.
“Hello, little ones! What brings you all the way up here?”
“Zazu! Can you take us to play with the ball?”
“All right, as long as you two don’t make a ruckus!”
Giggling excitedly, the cubs followed Zazu as he led them into the cave. He brought them all the way to a secret tunnel that led to a large room. Inside was a large, furry pink mound with legs and a lazy tail protruding from under it.
“Scar, wake up!” Zazu called. “You’re to be played with now!”
With an angry mumble, Scar slowly opened his eyes. He tried to look up at the ceiling, only to have his massive belly obscure the majority of his line of sight. He stretched his legs and tail out, which seemed more like they were decorations on a balloon now. He dejectedly pressed a paw into what was now a mound of flab and fat. It sunk in as he pressed deeper, and Scar could feel a growl in his throat.
Scar began remembering the first few days of his punishment. Instead of banishing him, Simba had effectively decided on the exact opposite. He began force feeding his entire hidden stash into the black-maned traitor, taking hours out of the day to stuff him like a turkey until he was full to bursting, and then fed him some more. At first, he had the power to resist, shifting his head violently and clamping his mouth shut when feeding time began; this at least delayed his stuffing by a margin of time. This became problematic shortly after the first few sessions. Despite his resistance, food still managed to fill out Scar’s belly and limbs. As he became fatter and more helpless, he became lazier and less resistant. Sure, he was protesting in his mind and through his voice, but his body had all but given up in trying to keep food out of his mouth. His back started developing fat on its own, and began absorbing his legs and tail. His rump and even his muzzle began storing fat as well, making them stick out and jiggle with every movement. Scar’s entire body had become an adipose-filled ball, with plump yet useless limbs hanging off of it.
“Simba,” Scar muttered, “How dare you do this to me…? I swear, one day I’ll have my—oof!”
Scar’s train of thought was interrupted by his squishy belly receiving a headbutt from one of the cubs, sending him in a rolling motion forward. He moaned and groaned as the two cubs sent him rolling all around the cave. One cub set him still on his back, jumped up to his belly and started bouncing.
“Come and bounce with me,” the cub yelled to his playmate. “It’s fun!”
The other cub obeyed and began using Scar’s soft belly as a trampoline, making Scar oomph and oof all the while.
“Grr…! You little ingrates,” Scar roared. The cubs jumped off of him and started running away, laughing
“Once I’m fit again, I’ll pounce on you and give you such a—”
“Ah, ah, ah,” Zazu scolded with a wag of a feather. “Temper, temper, Scar. You know what happens when you yell at the children, don’t you?”
“W-wait,” Scar stammered, “I didn’t mean—”
“Timon,” Scar called out.
Suddenly, as if from the sky, Timon fell onto Scar’s belly, landing gracefully with a bouce.
“You rang?” Timon said.
“Scar was being nasty to the cubs again. Do see that he receive a proper lesson, will you?”
“Sure thing, boss!”
“Please, not that! Anything but that!”
“You heard the bird. We gotta teach you some manners the hard way! Now open wide!”
Timon pulled on a nearby vine, letting a makeshift trough fall from the ceiling, tipping Scar’s mouth open as it fell. He began whimpering, knowing full well what was to follow.
“Pumba,” Timon called. “Let ‘er rip!”
“You got it, pal,” Pumba called back as he headbutted a button-like mechanism, slowly opening a hatch and letting meat travel through the trough and directly into Scar’s forced-open maw.
Already, Scar’s impossibly big belly was feeling tighter and was painfully distending as the ground meat made from his stash filled him up. He could feel it stretch out and become bigger. His plumping legs tried to clutch his belly, as if to stop it from growing, but it kept escaping his clutches as it grew wider and higher. His cheeks filled out with the meat being force-fed into him, making them plump up more than they already were.
“Now for the fun part,” Timon announced. “Gotta rub-a-dub-dub this gargantuan gut of yours; make sure it digests nice and easy so you can fatten up real good!”
Timon flexed his fingers and went to work on massaging Scar’s belly, pushing and kneading each section of fat to make room inside for more. Scar reluctantly let out some moans, rather enjoying the feeling of having his stomach rubbed, squeezed, and massaged. Despite the small pleasure he got from this, however, the fact remained that he was being stuffed and fed into further enormity and helplessness, which was something he would never get used to.
After what seemed to be ages, they had finished stuffing Scar. He was groaning from all the food still left to digest still sitting in his stomach, bloating him out more than he already was. He was too weak to say or do anything except swallow the food that remained plumping out his already full cheeks.
With more than a bit of struggle, Timon sat Scar up on his flabby rump and gave Pumba a thumbs-up before leaving the cave. Zazu flew up and perched on the apex of Scar’s belly and snickered.
“No need to worry, Scar. Treacherous liars are not fat! Why, there’s simply more of them to stuff and play with! Is that not delightful?”
Feeling powerless and defeated, Scar simply lulled into a food coma, knowing with horror that by the time he woke up, he’d be even more enormous than he was already.