A short informal greentext, not edited or polished much.
Completed 2024-09-03
There is the main green story, and an extra included sex scene.
Thread: https://desuarchive.org/mlp/thread/41359165/#41362753
I called her Thing/Thingie from Thingpone, but the pony is named Amber Rose. I realized my mistake after I started and decided to just go with it.

>Be Anon, the mostly totally normal pony
>Chilling in your flat
>It was movie night with your marefriend, Thing or Thingie as you like to call her
>She’s an auburn earth pony with the most amazing amber eyes you’ve ever seen.
>She seemed normal and as far as you could tell,
>Except for two details,
>1, she hated using the stove
>And 2, her love of horror movies bordered on disturbing
>Not just any horror movies though, it had to be slashers or body horror
>She just found it funny, she giggled all throughout Pony Centipede
>It never bothered you though, you loved horror movies too after all
>You slouch back into your couch, waiting for Thingie
>Finally she arrives with a big bowl of popcorn and a couple Dr. Peppers.
>She deftly hops the back of the couch and plops into the space next to you, spilling a few kernels
>”So what are we watching today Anon?”
>We’re watching a classic today, ‘The Entity’ by John Wood-Nailer
>Thingie looked at you, and her smile widened her weird way that you knew was fake
>Her whole face seemed taut
>”Uhh, could we watch another one?”
>Why?
>”Well I uhh,”
>”I’ve watched it before you know...”
>”I just don’t think it’s that good, you know. A monster from outerspace that can just, like, interface with you- our biology like that. Seems unreasonable.”
>That’s not really been a problem with the other movies. I mean, we watched Gay Ziggers from Outer Space like 4 times.
>Thingie laughed, “Yeah, we did, didn't we.”
>She went quiet but the issue wasn’t resolved.
>Aww come on babe, I’ve never watched it and been really looking forward to it
>You throw your hoof around her barrel and pull her close until she’s leaning on you
>She stroked her tail nervously as you look down at her
>”Well okay, we can watch it,”
>You pump your hoof
>Success!
>She smiles at your antics
>You hit play on the tv remote and the colourful studio promos begin playing out on the screen
>’BASED ON TRUE EVENTS’ rolled across the screen upwards
>You could see from the corner of your eye that her smile dropped when you weren’t looking
>Huh, she must really not like this movie
---
>As the movie progressed, Thingie seemed to just get angrier and angrier
>She criticized the set pieces, special effects, and acting
>You two often did that with cheesy horror slashers but this was different
>She was legitimately upset
>”Aww c'mon!” Thingie yelled as the Entity dragged another mare off screaming by melting their faces together
>Every elimination seemed to tick Thingie off until she seems to be shaking, muttering things under her breath.
>Calm down, Thingie, I can barely hear the movie, jeez. What’s the problem?
>Thingie sits up straight, and is straight up yelling now.
>”My problem is all those stupid “scientists” didn’t know what they were looking at!
>You throw up your hooves
>They’re looking at a monster that's killing them! I think it’s pretty cut and dry here.
>”No, it’s not. M-Maybe she was just misunderstood? I mean she could have been panicking and disorientated,”
>You rub your eyes, frustrated that you couldn’t understand why Thingie was so angry.
>What are you talking about? It’s not a ‘She’, it’s an ‘It’ and ‘It’ is clearly evil and trying to eat everyone
>”It didn’t happen like that,”
>Thingie, We are seeing it right now
>You point to the screen where another character is screaming for their life as they’re assimilated.
>”I SAID IT DIDN’T HAPPEN LIKE THAT,”
>Thingie winds her hoof back and throws it forward, it lunges out, stretching into a long fleshy tentacle and shooting through the television into the drywall behind
>The sound system is still playing the audio though
>The tentacle winds around the DVD player and crushes it into pieces
>The sounds of screams is instantly replaced by the smashing of glass and electronics
>You just stare at the spectacle of the *very familiar* fleshy texture of the tentacle
>A true cold horror dawns slowly in your mind, descending from the spine into your bones
---
>’Thingie’, or at least the Entity pretending to be her, stopped her rage and freezes for a moment
>It turns to you, it looks scared, with the tentacle still outstretched
>”I- Anon, I-”
>You don't wait around for the entity to turn on you next
>You leap from the couch and put some distance between you and it, and immediately scramble for the door
>”Anon wait!”
>It whips the tentacle back at you
>You've seen way too many horror movies to get caught like this, you duck just in time as the tentacle soars above your head and splatters into a spider web on the wall
>You stand back up just in time for a second tentacle to hit you square in the back, nearly knocking you over
>It hits like a rotten grapefruit thrown by a pro baseball player, splattering in all directions
>But the splatter isn't just liquid, it's more tendrils of flesh
>It's another spider web
>You feel it wrapping around you as you move, the tentacle drawing taught like a fishing line.
>”Anon!” It screams at you in a desperate voice.
>Fuck No, you're not stopping
>You dive for a closet doorway at the last moment before the tentacle snaps tight
>It tries to pull you in but you hold firm, and wrench yourself loose
>Yeow! It pulled out lots of hair from your hide like a hot wax strip
>Whatever, anything is better than the alternative
>Finally you make it to the doorway, ripping it open in record time
>Anon isn't becoming lunch today
>Just as you're crossing the threshold, a claw on a third thinner tentacle slams into your leg and clamps shut
---
>Sharp claws press deep into your skin
>It immediately pulls back taught
>You hold on to the doorway for dear life, pulling with all your strength
>You see behind you, the entity has grown larger, with elongated limbs and disgustingly wide set joints, bone spurs protruding with ligaments attached that seemed to grant her muscles a mechanical advantage like biological construction equipment
>It's mouth was widened with teeth scattered in bloated gums, and the tongue was the tentacle attached to you
>It spoke in a LOUD guttural distorted voice, mouth struggling to contort over the protruding tongue
>”WAIE, PWEE, A-NOU”
>Somehow you doubled and redoubled your effort to free yourself, lightning in your veins driving you on
>You could feel something tingling under the claw, and it was slipping off
>Wait no, blood was everywhere, you could see your skin was peeling off, having fused to the claw
>Your sweaty hoof slipped on the doorway, and suddenly you lost the tug of war
>The entity heaves you back and throws you deeper into the apartment
>Blood sprays along the walls and carpet as you fly
>Fuck fuck fuck!
>You look back to the entity and see the two forhoof tentacles have turned back into hooves, outstretched in a hug
>But they were too long
>Two new talon like limbs sprouted allowing it to walk with 4 legs
>It slowly advanced on you
>The tentacle claw around your leg still attached and leading to its mouth but with some slack now, you scramble and run the other way
>You make it to the bathroom and slam it shut on the tentacle
>You keep slamming it shut over and over
>”OW! A-NOU SOP”
>It doesn't sever the tentacle
>Every time you open the door for another slam, you can see the shambling entity coming closer
>You press the door closed as hard as you can, clinching down on the tentacle, and then lock the door.
>You put your back to the door and look around
>No windows, no other exits, no weapons
>Fuck
>Oh shit, oh shit, oh shit!
>HELP, SOMEPONY HELP THIS POOR BASTARD
---
>The entity spoke again in another voice, strained and high pitch but clearly it was Thingie’s voice
>”Anon, please listen to me, I can explain,”
>Don't you dare talk to me in her voice, you monster freak!
>”It's me Anon, I'm Thingie. I've always been Thingie”
>You can't take this anymore
>You start trying to pull your bleeding leg from the claw again, spreading blood on the floor
>”Stop struggling, I don't want to hurt you,”
>You don't stop
>”I said stop!”
>The claw around your ankle clamps down painfully, it feels like it's mangling and stinging the flesh with jellyfish stingers
>Sweet Celestia’s Tits!
>You collapse from the pain, and lay in shock on the floor
>”Just calm down, I won't hurt you any more than I already have,”
>Yeah right, you're just trying to trick me
>”I’m not trying to trick you. I wouldn't even need to trick you, I could kill you or break down this door easily but I'm trying to talk to you!”
>Prove it, bitch
>There's a quiet moment where neither of you talk, but you can hear some odd mucky sounds coming from the other side of the door
>Suddenly something slams into the door, again and again
>An axe made of bone smashes through the bathroom door with brutal strength, splitting off chunks of wood
>The entity sticks it's face in the hole, and looks at you
>You can see the face has distorted more, having grown another mouth that it used to speak
>It wore a nervous smile
>”Ummm, here's Johnny?”
>Whatever you are, that's not funny
>You felt the claw twitch
>”Sorry. Could you open the door please? My tongue is going numb,”
>Let go of my leg first
>Slowly, the claw opens but it's still fused to the skin and pulls at it
>The pain is excruciating
>Eventually the claw detaches, where it had fused somehow had a molten cheese consistency and it stole the skin without having to rip it
>It was painful, but not nearly as painful as it would have been to be flayed or having the skin ripped off conventionally, like with pliers or something.
>The entity looked guilty as she spied the injuries
>”Sorry, I panicked and just... Absorbed you a little bit,”
>You struggled to your hooves
>Aww fuck, should you unlock the door?
>She told the truth, the door can't hold her back and she could've paralyzed your with her claw...
>Fuck it, if you're going to die, might as well get it over with
>You open the door
>Good ol Thingie is on the other side, looking nervous but normal as ever
>What are you?
>”I'm not a pony, I'm from somewhere else, but you don't have words for what I am or where I'm from, and we don't have words or speech in the same way you do,”
>How fucking cryptic of you
>She winces
>”S-sorry, I guess the best description is ‘space alien’, but I'm still the same pony. I'm still Thingie,”
>Okay?
---
>You look at your wound still bleeding all over the place
>Can I go to the hospital now? Or at least get some bandages or something?
>”Oh, um, you don't need to do that. Just give me a sec, let me fix it,”
>She directs you to sit down on the toilet and lift your injured leg
>You're distrustful but also scared of her
>She places her hooves on your wound and they slowly meld together, 
>The pain quickly fades and then her hooves slowly un-meld and leave behind perfect skin with no scars and covered with normal coat hair as if nothing had happened
>Whoa
>So, am I infected now?
>”What? No! Anon I would never do that to you or anypony,”
>Aren't you the bucking monster in the movie?
>It looks away
>”I'm not a monster... ”
>Did you kill those scientists?
>”I... It wasn't my fault”
>So you did kill them
>”I said it's not my fault!”
>Her form began to distort, with another mouth appearing on her neck that quietly wailed
>She slapped a hoof on it, muffling it
>Tears formed in her eyes 
>”I crashed my ship in the Arctic, it was so cold and I was so hungry. I went into hibernation not knowing if I would ever wake up again. Then the next thing I know is I'm on an operating table being cut open by aliens that I can't understand. Then there was fire and then...and then I attacked them... But It didn't happen like in the movie okay?”
>A couple eyeballs blinked into existence on her body, crying a single tear before disappearing.
>In that moment, she stopped being a monster to you
>She wasn't a pony but she was still Thingie
---
>A new mouth spawns in her chest. ”Are you going to leave me?”
>She quickly covers it with her hooves
>Another mouth appeared on her back. “Please don’t tell anyone.”
>One of her hooves bent backwards unnaturally with sickening bonescraping sounds to cover the new mouth.
>She looked ashamed
>Hey now, it's alright.
>This is a... big hiccup but we can work on it.
>I won’t leave, and I won’t tell, but no more secrets between us okay? Let’s try to be transparent from now on.
>You place a hoof on her shoulder and pull her into a hug
>She shudders and you see a crying eyeball open on her plot and look at you
>Something kisses you on your chest
>Her hoof spreads into a multitude of smaller hooves that fan out on your back
>You don't know if you're going to get used to that
>Eventually, Thingie’s form stabilizes and the two of you retire back the couch
>You collapse into it, and nearly fall asleep
>Now that the adrenalin rush and excitement has passed, you’re exhausted
>”Sorry for breaking the tv, I’ll get you a new one. Maybe we should just call it a night,”
>Just then you remember the murdershow in the hallway
>We still need to clean up the blood, I’ll get the bucket
>”You must be exhausted from the fight so don’t worry about it, I’ll clean it up. It’s my fault for keeping secrets anyway.”
>You look at your sweet Thingie and pull her into a peck on the cheek, you love this gal so much
>Thanks babe, I’ll take a shower and head to bed then
---
>Be Thingie, the abnormal not-pony
>You pretend to take out cleaning equipment as Anon goes to the shower
>When he closes the broken door to the bathroom, you stop the charade and immediately go to the blood stains
>Cleaning with buckets of soap and washcloths is for chumps
>You just start licking and sucking up the delicious pony juice from the walls and carpets
>You’ll have to work fast, so you spawn multiple mouths and tentacles to work everywhere at once
>Soon, you’ll leave this place spotless, and nopony the wiser
>You know you’ll have to tell Anon about this at some point, but that conversation can wait at least until tomorrow
End

Extra Sex Scene!
>”Hey, Honeybunches?”
>Be Anon, post revelation
>It had been a few days since you found out your marefriend was an amorphous alien
>Ever since then, she has become more bold in showing herself off
>It started off innocuous
>A stretched arm to pass things here
>An extra tentacle to hold something there
>But soon enough she was dumping food into an oversized gullet or bulking her bone structure to move furniture while cleaning easier.
>You weren’t complaining
>If it made her life easier, it made your life easier
>But waking up with more than just hooves wrapped around your barrel took some getting used to
>You’re not sure but the other day, you caught her doing something with the egg carton
>You think she she forgot to buy eggs and “made” some using her morphing powers
>Nearly had to use a damn hammer to crack em
>You’ll never admit that they were the best tasting eggs you’ve ever had though
>All of this brought you to tonight, where Thingie was reeling you in to do the sideways tango
>She had pulled you to the bedroom and wrapped tendrils around you, and swayed to an unheard song
>”You’ve been so accepting since everything came out. I wanted to treat you, and show you something really special.”
>You raise a teasing eyebrow
>Am I going to need therapy?
>Thingie purrs and whispers in your ear
>”Maybe”
>That’s just the way I like, Babe. 
>She wastes no time, literally tossing you over her shoulder onto the bed
>You turn over and see her stalking onto the bed
>Her form had already changed, becoming longer, sleeker, more aggressive, like an apex predator
>You can tell she’s already having fun
>She climbs over you, you run your hooves over her soft hide and underbelly
>Her plump rump beckons a couple spanks and you indulge
>Already you can smell her hormones, a potent smell of sweat and desire
>She towers over you, lowers her hips and grinds her hips on yours
>You tug her into a kiss, and her neck elongates like a snake
>Her chin splits open and latches onto yours, pushing her tongue deep into your mouth and greedily probing everywhere
>You almost gag
---
>Down below, you feel her hoof direct your diamond dong inside her pussy
>She slips down onto you, tighter than ever before and oozing slippery liquid down your shaft and balls
>She pulls back from the kiss and you greedily suck in needed air
>”Holy Celestia, that’s something new under the sun”
>Thingie laughs, eager to show you more
>Her crotch morphs and you see a large ring structure around her pussy
>She meets your crotch, and then you realize it’s a octopus sucker when it sticks to you
>Uhhh, Thingie? We can’t move like this
>”Mmmmm, don’t worry honey,”
>You feel a strange sensation, and realize her whole vagina is sucking with incredible force, the vacuum being pulled seeming to force more blood into your member
>Hey, easy now babe!
>Something in her starts moving on its own
>A fat, soft tendril starts wrapping and rubbing around your member
>You can see the undulations in bulges on her stomach
>You put your hoof there to feel it, and rubber her teats while your at it
>She leans back to give you access and you feel the suction cup pulling at your crotch, keeping you firmly inside
>Thingie moans
>”You know, I can taste you right now, with my tentacle and pussy, and I love it!”
>You can barely function with your soul being sucked out through your dick
>S-so you can just do whatever you want with all your orifices?
>”All the differences in my orifices are practically illusions. I can have as many holes as I want and make them do whatever I want, take whatever form I want.”
>She punctuates her point by giving your penis a little love bite while buried inside her
>You laugh, how absurd
>Lets put that to the test
>You reach up and tug her body down onto yours, and pull her head into another kiss
>You savor the lascivious treatment for a few more moments before twisting, rolling over and putting her below you
>You pull back and poke your hoof at the sucker, and break the seal allowing you to pull your shining rod out
>The sopping wet hole greedily undulated, wanting to keep you in
>The tentacle poked out, looking for your penis
>Flip over babe, I’m sticking it where the sun don’t shine
>She gives you a naughty smile
>”No need, check this out”
>With a sound of grinding bone and cartilage, her legs hyperextend, and bend the wrong way, propping up her behind and giving you anus access as if she were on her front
>Alrighty then...
---
>You grab your member and push it against her chocolate flower, lubed by the unnaturally thick and copious vaginal secretions
>Her anus yields to you with just a bit of prodding and then you’re pushing in, hilting in the tight tunnel in one go
>She doesn’t even flinch
>”See? I told you,”
>You begin pumping away at her, and feel her morph below you
>Her anus folds morph into a pleasurable texture and begins excreting more lube, creating a sloppy mess
>”You don’t even have to worry about poo cleanup, or any of that other stuff. My anus is probably cleaner than your mouth,”
>Gross but okay?
>”What, it’s true!”
>You continue smashing her into the bed, gripping her hips and pushing harder and faster with every thrust
>Slapping her ass like it owed you money for good measure
>If it were any other mare, you would have hurt them, but not Thingie
>She was built different
>”Oh, yes, that’s it Anon!”
>It’s slick and oiled and smooth and *grippy*, perfect
>Her hoof wraps around your wrist, and you feel the familiar feeling of melding together at that point
>Thingie moans and growls at the same time
>”I can taste your blood, and hormones. I can feel your nerves, ooooh,”
>You feel more morphing through your dick
>Suddenly her chest bisects open, from chin to anus, with her ribs becoming sharp gigantic teeth
>Holy shit
>Her anus had become a sleeve around your cock, tugged over it by short, thick, and powerful arms fused to the sleeve
>They jerked up and down your shaft as fast as they could, messily flinging lube-secretion everywhere
>You nearly lost all motor control at that moment and fell over but her legs and forehooves held you in place
>Your cock tip was exposed, and she pointed it to her hungry chest maw
>A tongue-tentacle reached out from the maw and fondled your testicles, gently tugging them and alternating to assisting the sleeve-anus in stimulating your tip, begging for your seed
>Thingie was gasping and moaning, in the throes of passion
>”Anon, give me your cum, give it to me!”
>The chest maw hungrily growled
---
>This was all too much, and the orgasm crashed over you
>It felt like someone had pushed you off a cliff, like you’re soul left your body
>You couldn’t help but yell out
>You shot ropes like a 2 litre diet coke and mentos
>Thingie’s sleeved aimed your member, shooting cum all over her maw
>Her tentacle tongue wiped it all around, smearing it as much as possible
>She moaned from at least four locations on her body
>”It’s so goooood!”
>She continued to pump you until it was just dribbles,
>Then the sleeve around you sealed up to suckle the last drops
>Her chest-maw closed and sealed up, voraciously swallowing your emission
>Your mind was blank, having been nearly burnt out
>Thingie gently lowered you down onto herself and you let her
>You’re not sure if you could support your own weight anyway
>You lay there, catching your breath
>Even Thingie had to catch her breath
>The room felt quiet after the excitement had ended, and you cuddled
>There is a goopy mess between you and her but you don’t care
>She told you not to worry about it, and somehow you always wake up clean
>You nearly fell asleep then and there
>”Oh my gosh, Anon, that was amazing,”
>You breathe hot air into Thingie’s neck, and relax into a deep sleep.
End