The Purple People(?) Eater

It was a quiet night in Hometown as Susie was taking her normal route through the forest back home, deep in thought. Thoughts she was broken out of when she heard an unusual thunder above.
“Weird,” she thought, “Didnt think it was gonna rain.”
And indeed there was no rain, but a light coming from above her, getting brighter and brighter. Looking up revealed a massive fireball bearing down on her, and then missing by a good distance a second later. Still, fear gripped at her heart when she saw just where it was heading, praying to the Angle that it wasnt going to land where she thought it was going too.
A long bang followed by a rumble of the ground told Susie her prayer went unanswered.
“No no no NO NO!” Was all that was going through Susie's head when she saw the flames left behind by the meteor that decided to make a surprise visit to the otherwise sleepy town. Dread gripped at her as she ran through the forest,into the burning clearing and saw that the meteor had crashed in the propane container storage site and abandoned junkyard she had been calling home for most of her life. Steeling her resolve, she ran into the burning mess and wildly whipped her head around, attempting to identify the old RV trailer she had been hunkering down in while navigating an environment suddenly both so alien and so familiar. And then, having found her target, Susie dived into the flaming wreck to try to salvage what she could.
Desperately looking around for anything not already on fire or turned to ash, she made a grab for a damp clothing bundle left to dry after being washed, only for her arm to be grabbed by a dark purple tentacle. Acting out of fear and reflex, Susie attempted to yank her arm away from the tentacle, only to yank some kind of goopy nightmare spider that was taking refuge in the wet clothing. Deciding to make the best out of a bad situation, the creature wrapped the rest of its mass around Susie’s arm and began to seep into it as well, squirming its way past her scales. What’s worse is that for Susie there wasn’t any pain at all, but she could feel the creature moving underneath, intertwining itself into her muscles, and feeling like it was crawling up her veins, if the freakish bulging was any indication. This naturally set her mind into overdrive as basic fight or flight instincts kicked in, with her first impulse being to slam her arm, and the creature, into the wall to try to remove it, and when that didn’t work naturally she tried backing up and running away, again impossible due to the fact the thing was clinging onto her arm. She would’ve tried burning the thing off next, but her flailing around led to her knocking her head hard on the top of the doorframe hard, knocking herself out cold.

Kris had been madly chasing after his friend for the past 10 or some minutes, using a combination of her scent, following her tracks, and a general idea of where she went, using knowledge gained from some of his past stalkings whenever curiosity overpowered common sense in regards to what and where Susie went off to once they were done hanging out, clearly not having a house anywhere nearby and commonly smelling of the lake and dead fish each morning if she couldn’t get enough food the prior day. Coming into  the clearing, now brightly illuminated by the flaming junkyard he, Asriel, and the Holiday sisters used to play around in, Kris scanned the environment looking for any trace of the dragoness, finally picking out her form in the flames, hunched over and jerkily limping away from the rapidly spreading fire. Rushing in, Kris grabbed one of her arms and had her lean on him, only now realizing just how heavy she really was.
“Are you ok?” Was all Kris said before getting a look at his friend’s face, fear and chilling realization gripping at his own soul. Susie’s eyes were not their usual yellow, but rather a milky white, with veiny growths stemming from the eye sockets, as well as a toothy smile far too big and toothy, even for Susie.
“Thank you…. Friend,” was all the thing puppeteering Susie said before it seemed to retract into her, leaving the dragoness with just enough strength combined with Kris’ support to clear the junkyard just in time for the now obviously NOT empty propane containers to explode in a spectacular chain reaction, leaving massive fireballs in their wakes and knocking the duo onto the grass and Susie out for the count for good.

Susie woke with a start feeling as though something was watching her with predatory intent, only to find that she was in the Dremurr residence, crashed on the couch with a blanket on top of her, with Kris intently watching her.
“Hey,” was all he said.
“Uh, hey dude… how did I-?”
“I carried you here,” he said in a matter of fact tone.
“Uh, thanks. I guess.”
“Mom knows you’re here, and knows your home got blown up. She’s cool with you sticking around.”
While thankful for her friend sticking out for her, the memory of that… thing groping her arm suddenly came to mind and she wanted to make sure that wasn’t some hallucination from something burning that wasn’t supposed to.
“Hey, mind if I use the bathroom?” It was a weak excuse, but it was the best she could come up with at the moment given everything that’s happened. Kris, simply nodding in response, got up to go do something in the kitchen, while Susie attempted to both rush to the bathroom and not tip off her friend that something could maybe be very much wrong. Once inside and ensuring the door was locked, Susie tore off her top to better examine the arm in question when a voice growled in front of her “I didn’t leave a mark.”
Jerking her head to look at who, or what, said that, she came face to face with the bathroom mirror, but not with her own reflection, but instead there was what looked like a distorted version of herself. A strange mockery of her face, covered in a strange purple web like lattice, but still an obviously draconic head, with large milky white splotches in place of any proper eyes or even eye sockets, long hair pulled back into a ponytail of sorts, and the mouth lipless and almost bulging with how many teeth there were, locked in a perpetual grin of sorts.
“Have your attention? Good. Now, listen carefully. And don’t scre-“
Susie screamed. Loudly. Loud enough for Kris to spring into action and with a few cuts the bathroom door was completely off it’s hinges and on the floor somehow, with Kris gripping a kitchen knife and bloody murder etched in his face. Now Susie was screaming because not only did her best friend just kill a helpless door and look ready to do it again to her, but he also barged into a mostly topless Susie, which naturally piled feelings of fluster and rage on top of the heaping pile of abject terror.
This time the voice had other ideas on how to handle this situation, thrusting forth a tentacle to shove Kris a few feet away and onto the ground, and more importantly disarming him, if only temporarily.
“Window,” was all it hissed, and as if on cue Susie’s body sprang into action as she burst through the window, somehow landing the role, and running off into the forest again.
As Kris gazed upon the carnage that happened in the poor bathroom, he began planning. The door could be easily fixed, replacement hinges in the garage. The window couldn’t be so easily fixed but explained away by Susie having a fit. He didn’t like throwing his friend under the bus like that, especially since she probably wasn’t even in control when she went flying through the window, but the truth about her being possessed was downright unbelievable except to him. Now poor Susie, that would take some planning and figuring out. Especially since Kris wasn’t even entirely certain Susie WAS possessed. For all he knows what happened back at the junkyard was just a trick of the light, dancing shadows from the flames- no. No, he knew what he saw. And Angle help him, he was going to do everything in his power to help. Everything.

Susie had been running for a little while now, probably for 10 or some minutes, when the thing hissed “Ok, I think it’s time you stopped and listened.” And as if right on cue, her legs locked up and Susie face planted into the sort of soft dirt of the forest. As she got up and spat out a mouthful of dirt, she felt an odd protrusion of sorts stemming from her back. It didn’t hurt, but it felt more like a limb that had fallen asleep. And then that same head from the mirror swung around into Susie’s field of view, startling the already terrified dragoness.
“Now will you LISTEN to me?” It hissed. “I SAVED YOU from that abomination!”
“Oh yeah, great first impression. What’s next, Noelle is secretly some kind of bloodsucker? You’re not even real.”
In response to that comment Susie felt an odd sensation stemming from her back, almost like getting sensory input from a limb that has fallen asleep. Suddenly that same head from the mirror, slightly misshapen and without the hair, swings into Susie’s view, attached to a very long neck that extends behind her.
“Oh, I can assure you I am VERY MUCH REAL. You see, like you, I am a loner, a freak, a fugitive. Running from my own kind, I came here, to this world. More of my kind will follow, hunting me, and they will consume this planet as well.”
To all of this, Susie could only respond with “What? Wait, you’re saying you’re an alien?”
“Yes.”
“From space?”
“ *sigh* Yes, from SPACE. And YES I AM PURPLE LIKE YOU. ANY MORE QUESTIONS?!”
Taking the opportunity to sit up, Susie did ask another question. “What are you even? Like, what do you call yourselves?”
“We are symbiotes,” it said, ego mildly stoked, “And we can provide our hosts with a great many powers.”
“What kind of powers?”
Its mouth curling into a more obvious grin, the symbiote said “To answer that, I want you to punch a tree."
"W-what? A tree??" Sputtered Susie, flabbergasted at the bizarre request.
"Just WORK WITH ME here, ok? Punch a tree." insisted the symbiote.
Still hesitant, Susie got up from her spot and walked up to one of the nearby trees, curled her hand into a fist, and punched with all her might. The cracking of wood was the only resistance it gave as the section of the tree Susie punched practically exploded, causing the remaining portion to fall straight down onto the stump. And then it started to fall on top of Susie. Operating on instinct and guided by the symbiote, she thrust her other fist in the direction of the falling tree. it exploded in two the second her fist connected, causing the two halves to fall on either side of her, rather than on top.
"That... was... AWESOME!!" Proclaimed the dragoness, any fear or reservations about the symbiote washed away by the feeling of unstoppable power coursing through her system.
The toothy grin of the symbiote only widened in response. "So you see what I can give you now? And that was just a taste of our full power."
"Only a taste?! I want MORE! That felt AMAZING!"
Susie then proceeded to knock down at least 15 more trees before exhaustion finally set in. Breathless, she huffed out "Whoo... so... what, haaaa, what else can you do?"
"Oh, lots of things! Check this out.”
And with that Susie felt another burst of vigor as well as something creeping all around, encapsulating her. She felt protected, like getting hugged from all around, before her senses began to both dull and expand to the new body that had taken her place. The body itself stood at around 6’ 8”, and was several shades of purple lighter than Susie. The skin was not just covered in muscles like when she was in the Darkworld, but a chitin material as well with what looked like interlocking bone armor from some creature serving as an outer layer of protection. Naturally her 'assets ' were bigger as well and lacking the bone protection the rest of her body benefited from, her tail was much longer and much more pronounced, and she had strange, what looked to be woven, wings too. The one thing Susie didn’t like about this new form is how dulled all of her senses were, especially her sight. The lack of any substantial control of her body was also an issue, and the symbiote sensing her growing distress, relented some control back to her causing her senses to clear up a little bit too.
“Woah.” To say Susie was astounded by not just the sudden clarity of sensation, but also just simply how strong and untouchable she felt, would be an understatement. Sensing her want to test out this new body, the symbiote plodded toward another hapless tree and, with some effort, yoinked it up out of the ground roots and all.
“Whooh! We could probably give Undyne a run for her money!”
“Good. But I have my own reasons, desires as well.” Spoke the symbiote, now using its own mouth and Susie’s voice bouncing around in its head. “To say I came here to hide alone would be a lie. In truth I was a designated harbinger, sent to die here after our last harbinger failed to return. But if she survived, my arrival will not have gone unnoticed.”
“Great,” groaned Susie, “so we’ll be hunted down?”
“Maybe. But if she did, I doubt she managed to find a host who could even begin to find us. And we will be ready for her. Together, we will rise to the apex of this world, and reign supreme. None will challenge us, and you get to continue to use my gifts as we see fit. Do we have a deal?”
If she could, Susie would be putting on her infamous grin. “Deal, partner.”
And with that last bit of confirmation, the symbiote snuck back total control as its wings stretched open, getting ready for takeoff.
“Please,” spoke the symbiote, its already wide grin somehow getting even wider, “Call me Lesion.”

EPILOGUE:
“WE HAVE BEEN FLYING, FOR THIRTY MINUTES! DO YOU KNOW HOW EXHAUSTING THIS IS?!! WHERE IS THE DEMON’S DEN?!!!”
“PISS OFF ITS HARD TO SEE UP HERE. ALSO STOP CALLING KRIS A DEMON.”
“HOW DO YOU HAVE FEELINGS FOR A CREATURE THAT SMELLS OF INCREDIBLE NECROSIS??!”
“FUCK OFF HE SMELLS OF APPLES YOU SLUG.”
“I AM NOT! A SLUG!”