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The Simpsons: Diary of a Giant Hermaphrodite Centaur

Written by Silent Soul Ken

Tags include: Shotacon, Lolicon, Growth, Hyper, Transformation, Radiation, Impregnation, Pregnancy, Odd Creatures, Swearing, Mild Violence, Teenagers, Futa, Gender Bending, Breast Expansion, Penis Expansion, Balls Expansion

Chapter 1

Mutation

The year 1994, a year where an accident most bizarre took place one that changed the world for all time. For some reason every nuclear weapon and power plant suddenly detonated killing the cities they were near and releasing a light blue miasma into the atmosphere. The miasma had an unusual effect it killed all the adults slowly however it seemed to have no effect on children. But the truth became frightening when the 3rd month came, the miasma suddenly began to affect people strongly as the adults began to perish and the children began to mutate some merging with animals that had survived and becoming new creatures that would soon rule the world as all the adults in the world died out. Children now roam the streets, cities, plains, and capitals of the world. What do the children do now that they are tasked with jobs that once belonged to their parents? 3 children in particular struggle to maintain their love for each other where they need each other more than other.

-1994 2 weeks before the third month-

14 year old Lisa Simpson sobbed quietly as her mother, Marge Simpson, coughed and wheezed. Marge had boils on her body and some on her right eye covering it in a swollen mass with dried blood and pus. Marge's arms were withered and an ugly purple color one covered in small hives the other within sunken skin and boils. Her legs had become red and swollen the skin stretched and drawn so tight it looked like overcooked sausages ready to burst. Her lips cracked and caked with blood and vomit from recent fits of coughing and puking. Marge was wearing a thin black dress that barely covered her body even on the ruined bed of their home. She heard the door open and turned to see Bart walking in with their baby sister Maggie who was now dressed in toddler clothes and had her pacifier on a rope where it dangled. Bart grabbed Maggie and held her up having developed some muscle during the months having to do heavy duty works. Maggie reached for Marge but Bart held her back while they hadn't shown signs of the illness (Like it had been reported in the beginning of this tragedy) they weren't going to take chances not for their own selfishness. No, their mother told them not to even resorting to teaching Lisa herself to cook and how to take care of what was left of their house with its peeling paint, and rotting flooring. Marge wheezed as she sat up as best she could her left eye practically fine with some swelling near the upper eyelid. "My children... despite the unfortunate incident that took your father, my husband, away yet you still hung onto life. With the following months my sister perished and now it's my turn." Marge said. Lisa's lips trembled, and Bart closed his eyes wanting to shut out the wheezing and gasping but heard it nonetheless.

"Bart," Marge said he opened his eyes and looked at her quietly swallowing a hard lump, he knew what she would say but it was good to hear it nonetheless. "You need to be the man of the house, protect your sisters, work hard, and..." Marge was cut off by a sudden loud wheezing cough blood spraying onto her body with each cough. Maggie whimpered and sniffled, "Kck... don't slack off, and do not what is best for you but best for you and your sisters," She finished Bart smiled as the tears built up in his eyes.

"Yeah mom," Bart said with his still childish-like voice Marge turned to Lisa.

"Lisa, listen to your brother but remember to make decisions when you know they are wrong. Keep practicing your cooking, and never forget what's important to everyone, love..." Marge said, Lisa hiccupped but nodded. "Maggie," Marge said smiling sadly, "Maggie my dear Maggie, you are young but you have the most important job of them all..." Marge inhaled deeply wheezing her chest rising then she exhaled. "Keep the joy of your heart, the spirit of happiness, and the knowledge of love," She coughed weakly. "Look after your siblings, keep them smiling and remember to have fun." Marge said. She smiled, "Homey... I'll be with your shortly... I hope," Marge said and with a final deep breath she inhaled her last breath. Maggie began to cry loudly as if her cries could bring her mother back but nothing would. They brought Marge to what remained of the backyard, after calming Maggie down and putting her to sleep. Lisa helped Bart dig her up and made a small wooden sign. Lisa looked at Bart as he stabbed the shovel into the dirt and looked at the grave. Lisa went to Bart and kissed his cheek gently, Bart sighed and he grabbed her holding her tight.

"Bart... what's gonna happen to us?" Lisa asked, Bart was silent the 14 year old staring at the grave the same question in his mind. The kids in the city were slowly taking over the jobs the adults had but were running them unfairly. However he had his sister and her love and they had to watch over Maggie.

"We'll just do what we can you stay at the house make list for food when we run low and I'll go get it," Bart said. Lisa nodded into his muscular chest, she then squeaked as she felt his hand grab her butt and pinch it. She blushed and pulled away.

"Bart!" She said.

"Sorry Lis... but... maybe it will help..." Bart said, Lisa sighed and she knew he was right it happened when the nuclear weapons and power plants exploded. The Irish boy she met who she had been pressing for a relationship however he went to protest for worker's rights with other people. So he was among the first causalities. Lisa had been utterly heartbroken and distressed especially the footing they had left off. She became maniac depressed and even attempted suicide. However Bart came and expecting mocking she was surprised by his gentle can soothing talk. Eventually he talked her out of suicide and her feelings for her brother quickly grew with the second month though it became intense especially considering how they both filled out. Bart's constantly muscular body and his lower half swelled immensely and Lisa with her butt growing out she was a bit embarrassed and sad that her butt grew but not her breasts. But she wasn't complaining too much the love they shared was blissful, happy, and it drove everything out the window the only thing remaining is there love for eachother. They never went all the way because they were siblings and because they were so young. However the barrier was closing and the both knew it.

"Maybe later Bart I need a few days to think..." She said, 'There will be plenty of time later' she thought somberly.

'What do I do?'_Bart thought looking at the grave, _'Why did I have to be set with this... dammit...' He thought angrily clenching his hands in frustration. He sighed and went inside the house ready to get materials needed to fix the house.

-2 weeks later-

_ _

Bart sighed as he rubbed his head at the electric gauge it was full but the electricity had been going wonky from no one managing it. He wondered if he should get Millhouse down there to work it. He grunted slightly and shifted his legs slightly for some reason today he felt very... horny he didn't know why throughout the whole day he felt very... frisky and bothered. He suddenly felt something press into his back he turned to see Lisa pressing against him he could feel sweat running down his back. "Hey Lis," He said he felt her rub her body against his, 'She feeling what I'm feeling too?' He wondered, his cock straining against his pants a slight ripping was heard. He was quickly answered as she suddenly jumped up and he instinctively grabbed her legs and held her up he could hear her panting in his ear and felt her tongue lick his earlobe. Bart surprised but pleasantly so looked as best he could at Lisa, "Lis what-?" He was caught off by her hiss.

"Let's go, now Bart... so hot... feel... hot... bed," She said feverishly her mind consumed with wanting sex for some reason. Bart adjusted his position and he walked to the open backdoor, leaving it open he went to his room and he laid down and Lisa disengaged. He stood up and turned around to see her, Lisa was wearing her old single piece clothes which were small on her body especially with her big butt and her B-cup breasts, he could see the soaking wet panties and his nostrils registered the light aroma of hormone from her and his cock struggled even harder making him wince. He quickly grabbed his pants his mind hazing as he went to his sister his pants pried off as his hard foot long cock sprung out and he was on his sister. Kissing her feverishly his cock rubbing between her big butt cheeks, Lisa grunted and huffed loudly. Bart' nose flared inhaling the scent of juice and musk but that wasn't all that he or she was inhaling.

From the open door and the cracks in the windows the miasma came in and began to invade their body. However due to its odorless nature they never smelled it nor did they notice it as Bart's cock went into Lisa's ass cheeks and into her asshole spreading it wide. Lisa grunted as she felt her brother thrust in powerfully his muscles contracting visibly. Lisa enjoyed watching her brother fuck her the muscles flexing and contracting with each thrust made her warm inside to see him put such strength into her. She reached up for him and Bart grunted stopping and grabbing her arms and pulling her up his cock bending upward in her ass. The two kissed sloppily as Bart continued to thrust up into her his huge cantaloupe sized balls gurgling audibly. The two broke and Bart lifted Lisa so high that his cock slid out she gave a distressed moan but was quickly shut up as she was turned over and set on the bed again this time her legs dangling on the floor her butt stuck up. Bart grabbed the ass and squeezed it hard making Lisa give small cries of pleasure.

"Such a big ass Lis, so big... so soft and so tender..." Bart said, unaware of his cock and balls swelling slowly his skin itching despite no clothes, Lisa herself was also experiencing change, her butt was growing slowly, her lower torso was slowly extending and her breasts were slowly gaining mass. But the two so into their sex never noticed as Bart thrust his now 14 inch cock inside. Lisa grunted at the bigger cock but she didn't care the only thing in her mind, as well as Bart's, was fuck, fuck, fuck. Neither noticing as they continued their changes were now progressing faster than before as Bart's arms bulged his body lengthening his hands changing now growing a short but thick cluster of fur. He was growling now like a dog and that caught his attention, "L-Lis... I... I feel," He gritted his new canine teeth and he opened his mouth revealing the jaws he now bore he snarled and barked. From his tail bone a thin tail wagged in the air signifying his pleasure despite his confusion.

"B-Bart!?" Lisa turned to see her brother who was growing still his once 4'8 frame now at least 5'4 Lisa then gave a shriek as she felt him lick her ass. Lisa too was changing her butt still swelling her lower torso extending and her breasts swelling. The two continued Bart pumping into her his tongue out and falling down, down reaching Lisa's now massive bottom, where above her butt cheeks a small scruff of hair had formed. Bart's fingers became claws that dug into his sisters flesh, as Lisa began to form a second pair of legs and between the pair that was attached to her butt, a sheathe was growing a cock coming out distinctly horse in shape with massive balls as well. "Mmmm... mm...!" Lisa grunted each thrusting causing a break despite how far her now horsey flank pushed Bart away. Her feet having morphed into hooves scuffed the ground as Bart continued pumping his now 22 inch long schlong in her. Lisa's new legs were wobbling and unable to balance herself her horse body fell. Unfortunately she also feel on her watermelon sized balls and her 24 inch cock making her give a weak whimper. Bart who was panting heavily now kept pushing in and out filled with a new stamina. His body positioning to allow him to pump in harder and faster, bringing him closer to his limit he gritted his dog teeth. His tail wagged wildly and he slammed in a final time howling Lisa gripped the bed tightly her eyes rolling up to the back of her head her teeth clenched drool ripping from her lips onto the ground. The two stayed that way till Bart's balls' stopped delivering. Had he done this while they were in their normal forms Lisa would've had a huge potbelly. But in their new forms he barely made a crease on her horse-half. He pulled his limp dick out which still occasionally burped out cum.

Lisa was scuffing the ground weakly the cum in her ass and stomach roiling in her. She then felt a wet tongue lick her horsey flank. Despite the horse like features she still had smooth skin instead of close set fur like Bart had. It was then that she remembered the pain from earlier and she tried to stand. It was hard she kept falling or tripping over her new legs. She then felt Bart grab her and lift her up blushing she thanked him and looked down. She could not speak. What could she say honestly? 'Not only am I some freakish centaur thing I also have a dick and balls too, huzzah!'

"Lis..." Bart said, he then noticed the miasma and lowering her he growled at it, but the miasma continued to drift harmlessly. "That damn smoke," He snarled, "It changed us somehow," Bart snapped.

"M-Maybe... if it did though..." Lisa said her thoughts moving quickly.

"Maggie," Bart said and he quickly exited the room, and into Maggie the door banging open he saw Maggie sleeping but it wasn't the Maggie he was so familiar with. This Maggie was a small blue caterpillar about her normal body size. She had her pacifier in mouth and sucked on it in her iconic way as she slept. Bart saw the miasma drifting around the room and her growled. Then he stopped when he heard Maggie stir. He walked backward out the room closing the door softly. He then heard clopping and he looked to see Lisa coming out of his room looking more confident. She stopped and looked at Bart.

"Maggie?" She asked, Bart gave a huff from his nose Lisa put a hand to her chin thinking. "What is she?" Lisa asked.

"A caterpillar," He said.

"Well at least she'll be able to grow up normally." Lisa said.

"I dunno, I doubt we're the only ones that changed I'll go out and take a look you need to practice walking." Bart said, quickly noting the wobbly legs. Lisa scowled but knew her brother was right. Bart walked downstairs and he grabbed the railing slightly he now had huge paw like feet kinda like Scratchy the cat. Ignoring that he got downstairs and closing the backdoor he went to the front and unlocked the many locks and opened the door. The moment it opened he gave a gasp, the street was a mess, poles, trees, fire hydrants and various other items were destroyed, ripped up, or crushed. It was like a tornado had come with boulders. He walked forward and he quickly began to run as he did he winced at the loud cries and screams coming from houses. He could imagine some kids turning. Without the pleasant relaxant known as sex to ease them into their transformation as it did him and his sister. He soon found himself loping slightly before going on all fours moving quickly. He ran heard loud screaming that rattled his canine ears and he stopped yipping. Then the scream stopped. He recognized it, Millhouse. He turned and padded down there. The door was locked but Millhouses screams were audible. Bart growled and smashed through the door to see the messy torn up house. He heard growling and Bart hid beneath the stair as he heard the sound of crashing wood he gazed up to see Millhouse. Millhouse had changed into a type of giant cat, slightly long blue fur, two pointed ears on top, a long tail that swished side by side smashing into the walls. His face even became more cat-like. Bart deciding to ere on caution left and headed back to his home as fast as he could to tell Lisa what had happened. He entered his house and locked all the locks he then looked at the walls and he knew he had to reinforce it several times over. But that could come later for now he had to tell Lisa the news.

He ran upstairs and looked in his room he then saw Lisa wasn't there he went from room to room and eventually found Lisa. Lisa seemed to be balanced on her skin colored horse body she was scuffing the ground with a hoof. When Bart stood at the door she turned Bart was pleased to see her do it so effortlessly. She looked at him concerned. "Well?"

"Looks like we're not the only ones all the kids are turning problem is not into you or me... at least as far as I have seen," Bart said.

"Hmm well we should probably run some tests on ourselves to properly stock up on food and maybe even grow some vegetables." Lisa said.

"You sure Lis,"

"Why not I have the power now so pulling it should be no problem,"

"Ok I won't stop you, I'll go get the supplies," He said.

"No I will it's about time I test these things out at full speed."

"No you won't it's dangerous out there and what happens if you fall?"

"You don't know that, I'm getting better and better!" Lisa said.

"Why don't you two calm down, you're giving me a head ache." Said a gentle yet powerful voice Lisa and Bart didn't move then they looked around. "Down here," Bart's eye twitched the voice was in his mind. Lisa also registered this but they both looked down was there some type of small mutation... then they froze. They turned their eyes to Maggie, "Yes that's right me..." The two stood there for a minute then they promptly fainted. "Oh good grief," Maggie said then she began to inch her way to her brother and sister. These three children would have to deal with a new world with new rules and a new way of life. A life that never should have been made or forced upon but now required. To break all forms of normality to replace with extraordinary normality.