In the small darkness of the lights of a lab, mixes of many things; scientific ingredients that no one would be able to pronounce except for one person... Twlight Sparkle, the only one diving so deep into researches that could potentially create something unspeakeable for many.

Inside a glass container there is a strange substance that has the mixes of red and black that never mix between each other. Twilight had a small gap open on the container and with carefull approached an electrode to the substance and shocked it for a breef period of time, just to close the container after it. After that she placed the container on a table and approached a finger to one of the borders... the substance, reacted and displaced towards where her finger was. Twilight smiled after seeing her success.

"It's alive..." She mumbled. "IT'S ALIVE, YES!" Screamed all over her lab and jumped of happiness all around the table. "It took me nearly two months, but i finally have done it" Then her joy was suddenly cut by the door bell.

Sunset Shimmer was just waiting for Twilight to open the door, they were suposed to meet at a cafeteria... about an hour ago, Sunset was just tired of waiting so she came to Twilight's house. Just a few minutes it's what Twilight took to open the door for Sunset.

"Better later than never, i've been waiting for you for a long time, Twilight" Sunset's voice had obvious upset tones. "What where you doing?"

"Oh... it was today?" She literally admited that she forgot. "My bad Sunset, sorry. It's just i've been working on something very important" She showed the container to Sunset.

"It's... Watermelon chewing gum?" Sunset joked about it's colours, makign Twilight raise an eyebrowse. "I'm sorry... haha, it's just that it looks a bit silly. What is it anyways?" Sunset said it between small giggles

"Very funny, this is an actual life form that took me long to create. I still have to find a solution to some weaknesses it has like loud sounds and fire but i think with this i can make something to help with modern medicine" Twilight explained to Sunset, who did not understood any of the words Twilight said, but she looked so happy that didn't wanted to interrupt her; except for one little thing.

"Hey Twilight, i'm sorry to interrupt you... but i need to use your..."

"Say no more" Twilight placed the container on the table. "First door on the left, i'm sure you remember"

"Thank you" Sunset run throwing her bag in the table, opening when it landed; spreading all of her things all over the table. Meanwhile Sunset was in the bathroom, Twilight cleaned all the mess Sunset did putting all her things inside the bag. "Twilight, i may have to go just as i get out of here. I have to study for something"

"I can help you if you need" Twilight offered herself, not paying attention for a second on what she was putting inside the bag; so she put inside the container without realizing. "You know i'm a great studying pal"

Sunset went out of the bathroom and grabbed her bag. "I'm thankfull, but this is out of your reach. I guess you do know about programing related to gaming?" Sunset asked but Twilight just negated with her head. "I knew so, see you later... and by the way, i would take a shower; your lab clothes smell a bit" Twilight checked as soon as Sunset leaved the house, shutting the door behind her.

"She's right... well then; today i made a good work. I'll take that shower and go to sleep" Twilight went directly to the upper floor, still not realizing what she have done.

It's almost 12 Am, Sunset is still studying but her eyes can barely stay open towards the bright screen with the multiple lines of code. It was not ok to keep studying so she shutted down the computer and after a small rest on her arms she standed up and put on her pijamas. On her way to the bed she accidentally dropped her bag making again to all the things inside to spread over the floor.

"Ugh... i'll clean it tomorrow... now i need some rest..." She walked slowly to her bed and just fell straight to it sinking into the mattress and almost falling asleep as soon as she changed to a better position.

Hours passed, something is moving underneath Sunset's bed, slowly getting closer to the mattress... it was that strange substance that finally reached the top of the bed, it crawls slowly closer to Sunset until it reached her feet. Sunset was wearing sock, but the substance did not cared about it covering it and pierced the fabric as if as a liquid it was... touching Sunset's foot.

The warmth of Sunset's body made the substance grow and climb up the leg; Sunset was feeling it, but as she was just tired she just started dreaming about someone touching her shamelessly. As soon as it reached her pussy, it went inside spreading too on her insides and the other leg; Sunset started moaning.

The thing could be seen moving upwards Sunset's body, the pijamas were moving as it were going up and inside every hole it encounters on it's way; at that moment... her asshole. Sunset's moanings were getting louder as it kept growing, covering her breasts competely, reaching her arms and growing on them; making Sunset grab onto the sheets and make even louder moans. It reached the face, as soon as Sunset opened her mouth again it crawled inside it, spreading even more on her insides; Sunset's body arched of pleasure and squirting all over her bed... finally the thing covered her whole head and with all the spreading on Sunset's insided it took control over her brain.

She stopped squirting and arching, the thing molded itself as Sunset's body, but also making some other changes on her that no one could see until it would like to. The eyes opened, it walked down the bed and faced itself into a mirror... when the light was turned on, it was still Sunset's body... but not Sunset's mind, the thing was still crawling on her face makin space to look itself on the mirror.

"We... look... great!" It said with Sunset's voice, it took off Sunset's pijamas and rubbed her hands on the body. "Such strong feelings, she has the perfect feelings for me... or she had them, but they're still here; with us" The thing giggled while still admiring the body it took control over. "What's this? Friends? One is our creator... well then, we think we can get a bit selfish and spread myself a little bit more" Claimed as it's goal, just to then start laughing as loud as it could... Twilight, what have you done?

Author's Note

For some reason Marvel is not a crossover; this was initially an idea for a Symbiote story but since that wasn't a part of the things i could chose from, well i made it a mistake made by Twilight. This will be a shorter story, with just the chapters i have planned. I hope i can develop it a bit more.