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English
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Published:
2025-03-23
Completed:
2025-03-23
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6,048
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2/2
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A Stray Core

Summary:

After GLaDOS begrudgingly spares Wheatley—turning him into a hulking, digitigrade machine with sharp claws and a wire-like tail—she assigns him to be Chell’s companion. Not out of kindness, of course, but as a means of control. Chell, finding the outside world a desolate wasteland, reluctantly chooses to remain in Aperture, striking a deal to test in exchange for shelter.

Tensions are high. Chell wants nothing to do with Wheatley after his betrayal, and Wheatley—desperate to make things right—clings to her like a lost, overgrown pet, completely unaware that GLaDOS has tweaked his personality to be more… submissive. And clingy. And strangely feline.

Between the constant tests, Wheatley’s misguided attempts to gain forgiveness, and GLaDOS’ endless amusement at the walking disaster she’s created, Chell finds herself stuck in a bizarre new routine. Testing. Resting. And somehow, tolerating Wheatley curling up beside her like an oversized cat every night.

This wasn’t the future she expected. But in the cold, endless halls of Aperture, it’s all she has.

Notes:

Welp! this is my first Fic im actually really interested in finishing!! , If you like it PLEASE leave a comment or kudo!! [Seriously, please do!! i love hearing feedback as well as knowing i have actual interest in this!! it DEF drives me to continue if i know there's people who are anticipating this lol.] anyways!! enjoy!!

Chapter Text

 

Chapter One: Atonement

The lights flickered dimly in the depths of Aperture Science, casting long, sterile shadows along the white panel walls. The facility hummed with quiet life, a stark contrast to the chaos it had endured mere days ago. The wreckage from Wheatley’s reign had been cleared away, the test chambers meticulously repaired, and everything had settled back into its familiar, suffocating routine.

Everything—except for the fact that Chell was still here.

And that Wheatley was still alive.

He Wobbled awkwardly a few feet behind her as she stepped into the newly restored test chamber, the sound of her boots against the floor sharp in the mechanical silence. She hadn’t spoken a mere grunt or huff since GLaDOS had unceremoniously dumped him back into her care, and honestly, he wasn’t sure if she ever would.

"You may begin the test," GLaDOS droned from the speakers above, her voice as cold and indifferent as ever. "It’s the least you can do after everything you’ve put me through."

Chell exhaled sharply through her nose. She didn’t respond—she never did—but she stepped forward, scanning the chamber with calculating eyes.

Wheatley, in contrast, was a jittery mess. He shakily walked after her, He was given a new body, one oddly larger than Chell herself, It felt almost Endearing yet awkward to be able to stand and walk alongside Chell, let alone talk to her again after what he had done.. his optic flickered with nervous energy. "Right then! Testing! You love testing, don’t you? I mean—not in a weird way, obviously. More of a, uh… necessity, yeah?" He let out an awkward laugh. "But look at us, eh? Just like old times! Except, you know, not at all like old times because—because those were awful, and I was, um… evil. But! That’s in the past! Totally different Wheatley now, brand new, all better, Can walk and got these weird claw thingies!—well, mostly better, still got some dents, but—"

Chell stopped abruptly, and Wheatley nearly bumped straight into her. She turned to glare at him, arms crossed.

He froze. "Oh. Uh. Too much, yeah? Too much talking? Got it. Shutting up now." He made a zipping motion with his clawed hand. "Mmmph. No more words. None."

She rolled her eyes and turned back toward the test chamber, but the annoyance in her expression lingered.

From above, GLaDOS sighed dramatically. "Oh, this is delightful," she mused. "A disgraced, defective core, desperately groveling for the forgiveness of a mute lunatic. How... charming."

Wheatley winced as his optic flickered with embarrassment. "Yep. That’s—that’s fair. Bit harsh, but, uh, fair."

Chell, ignoring them both, fired a portal at the far wall. She had agreed to this arrangement only because the alternative was stepping out into a world that had nothing left for her. Civilization was gone, swallowed by time and ruin, and even if she had made it out, where would she go? Who would she be?

So she stayed. And she tested.

And unfortunately, she was stuck with him.

Wheatley trailed behind her as she moved through the chamber, watching her work with awe and guilt tangled up inside him. She was brilliant, graceful in a way he’d never appreciated before, her mind working faster than he could keep up with. He wanted to tell her. Wanted to say something that would make things right.

But she didn’t want to hear it.

And maybe she never would.

As Chell moved through the chamber with practiced efficiency, her expression locked in quiet determination. The puzzle was simple—too simple. GLaDOS was easing her back into testing, though whether it was out of some twisted sense of mercy or just to toy with her, Chell didn’t know. Probably the latter.

She placed a portal near the exit, then turned toward the cube resting on a ledge across the chamber. Without hesitation, she fired another portal beneath it, watching as it tumbled through and landed perfectly onto the red button. The exit door slid open with a mechanical chime.

"Well, that was disappointingly quick," GLaDOS mused, sounding bored. "And here I thought watching you struggle would at least provide some mild entertainment."

Chell ignored her and strode toward the exit—

—only for the door to slam shut right before she stepped through.

"What?!" Wheatley yelped, his optic whirling frantically as he turned toward the button. "No, no, no—oh. Oh. That’s—um. That’s on me, innit?"

Chell slowly turned to see what he’d done.

Wheatley stood near the button, his large, clawed hands awkwardly reaching toward the cube like he had just tried to adjust it. His new body—tall, lanky, and vaguely predatory in design—didn’t match his anxious, bumbling nature in the slightest.

"Right! So, you were doing a great job—brilliant, really—but I thought, ‘Hey! Maybe I should help! Be useful for once!’ So I, uh, just gave it a little—little push. Tiny push. Didn’t mean to knock it off entirely —which, yeah, I did, but, uh—" He gave a nervous laugh, shifting his weight between his digitigrade legs. "Oops?"

Chell inhaled sharply through her nose, walked past him, grabbed the cube, and shoved it firmly back onto the button. The door reopened.

Wheatley, desperate to make up for his blunder, hurried after her, his claws lightly clicking against the metal floor. "Wait! Wait, before you go!" He moved in front of her, large frame hunched slightly in an attempt to make himself seem smaller. His optic whirred with hopeful excitement. "You’re, um—pleased with me, yeah? I mean, in a ‘look at him, he’s trying his best’ kind of way?"

Chell’s glare was answer enough.

"Right, right, I get it, still on thin ice. But, um, if you were just a little pleased—maybe a teensy bit—you could, uh… I dunno, give me a lil’ pat?" He tilted his head forward eagerly, like an oversized, over-engineered dog seeking affection. "On the ol’ head? Just a small one? As a, uh, ‘good job not ruining everything entirely ’ sort of deal?"

Chell stared at him, unimpressed.

Wheatley fidgeted, his clawed fingers twitching anxiously. "Please?"

Instead of the affectionate pat he so desperately wanted, Chell gave him a swift bonk on the top of his metal head, just hard enough to rattle him.

"Ow!" he yelped, stumbling back slightly. " Rude! "

Up in the observation chamber, GLaDOS let out a pleased hum. "Oh, that was satisfying," she purred. "Do it again."

Chell smirked, just slightly, before walking toward the exit without another glance.

Wheatley, still rattled, scrambled after her, his claws tapping rapidly against the floor. "Oi, at least consider the pat next time, yeah?!"

The moment the test chamber door sealed shut behind them, Chell exhaled through her nose, shoulders tense. She pressed the elevator button without hesitation, stepping inside as the doors slid open with a soft chime.

Wheatley followed after her, but rather than standing still like a normal person, he paced slightly, his sharp claws clicking against the metal floor. He stretched his arms, flexed his clawed fingers, then experimentally curled his toes, making a soft scraping noise against the ground. He looked down at his feet and let out a delighted laugh.

“Wow, this never gets old! Look at me! Walkin’ around, just like you! Not rolling, not hanging from a rail, not stuck in some—some horrible, infinite void of space! Nope! I’ve got legs! Proper legs! And arms! And—well, I suppose I did have an arm before, but not like this! Look, I can do a thumbs up!

He demonstrated by giving her an enthusiastic thumbs up with one of his clawed fingers, optic bright with excitement.

Chell did not return the enthusiasm. Instead, she gave him a slow, irritated glare before sighing loudly, rubbing her temple as if willing him to stop talking through sheer force of will.

"Oh, don’t give me that look," Wheatley said, his tone nervous but still cheerful. "Come on, be honest, it’s a little cool, yeah? You and me, walking side by side! Like proper companions! I mean, obviously, I still need to work on, uh, not messing things up—bit of a learning curve —but imagine how much easier this’ll be for both of us! I can help you now! I mean, alright, not with puzzles, but, um, I dunno—moral support? Carrying things? Oh! If you ever need to get somewhere high up, I could totally lift you! No need for portals all the time! Just a quick ol’ heave-ho, up you go!"

He mimed lifting her, grinning with his eye as if the mental image was brilliant.

Chell narrowed her eyes, unimpressed.

It was then that GLaDOS’ voice rang through the elevator speaker, slow and smug. "I should mention," she mused, "when I gave him his new body, I also made a few… adjustments. "

Chell turned her head toward the speaker, expression flat but mildly intrigued.

Wheatley, however, stiffened. "Wait—hold on, what? "

"Just a few harmless personality tweaks," GLaDOS continued, her voice dripping with feigned innocence. "Since we both know he is utterly useless as a thinking machine, I had to find some other way to make him somewhat bearable."

Chell raised an eyebrow.

Wheatley pointed at himself, claws twitching. "What do you mean, ‘tweaks’?! What did you do?!

"Oh, nothing major," GLaDOS said. "I simply made him… clingy. "

Chell slowly turned her gaze toward Wheatley, who looked absolutely horrified.

"I also gave him a few behavioral quirks modeled after certain domesticated animals," GLaDOS added. "I figured since he was already an annoying pest, I might as well make him an adorable one."

Chell smirked slightly at GLaDOS’ remark, rolling her eyes in amusement as the two AI’s rambled to each other.

Wheatley sputtered. "Y-You—you WHAT?! What does that even mean?! I—I don’t feel different! I don’t—I don’t act like an animal!"

"Don’t you?" GLaDOS replied smoothly.

Wheatley’s optic flickered rapidly as he turned to Chell in a panic. "Chell, do I—do I seem different to you?!"

Chell crossed her arms, tilting her head as she pretended to consider. Then, after a brief moment, she simply nodded.

Wheatley looked betrayed. "Oh, brilliant, that’s—that’s fantastic, " he huffed, crossing his arms and dramatically turning away. His back arched slightly as his claws flexed against the floor in frustration, his tail-like cable twitching behind him. "This is outrageous! I was already plenty charming before! I don’t need weird animal quirks to be likable!"

"You weren’t likable before," GLaDOS deadpanned. "That was the problem."

Wheatley gasped, utterly offended.

Chell snorted softly, just barely holding back a laugh.

Wheatley crossed his arms tightly, his claws scraping against his metal plating as he continued to grumble. “This is absolutely ridiculous! I—I am not clingy, and I certainly don’t have weird animal habits! I’m just—I’m just enthusiastic! Energetic! Full of spirit!

As he spoke, his wire-like tail flicked sharply behind him, lashing back and forth like an agitated cat.

Chell watched with mild amusement, arms crossed as she leaned against the elevator wall.

GLaDOS, however, was quick to pounce. “Oh yes, you’re completely normal, ” she said dryly. “Throwing a tantrum, hissing at me—”

“I AM NOT HISSING—”

“—and now your tail is doing that little flicky thing that cats do when they’re angry but pretending not to be.

Wheatley’s optic widened. “My—my what is doing what?! ” He craned his head around to look, and sure enough, his tail was twitching rapidly behind him, snapping left and right with each surge of frustration. His entire frame stiffened as he let out an indignant noise. “Oh, that is not fair! I don’t—I can’t even control that! This is so unfair!”

Chell sighed through her nose, rubbing her temple. Watching him spiral was exhausting.

And yet, an idea struck her.

She didn’t want to do this. In fact, she could already feel the secondhand embarrassment creeping in. But if it shut him up for even a second…

Gritting her teeth, she rolled her eyes, reached out—

—And petted Wheatley on the head.

Wheatley froze.

Chell immediately regretted it. The moment her fingers brushed over his metal plating, his optic dilated so fast it was almost comical. His entire body went rigid, and his flared-out limbs twitched slightly, like a startled animal caught off guard.

GLaDOS made an amused hum.

“Well,” she said, absolutely delighted, “isn’t that adorable.

Wheatley made a choked noise in response.

Chell, already embarrassed beyond belief, started to pull her hand away—only for Wheatley to instinctively lean into it, optic dimming in an almost dazed manner.

Chell snatched her hand back like she had just been burned.

For a moment, there was complete silence in the elevator.

Then—

“Oh, that’s rich,” GLaDOS said, her voice brimming with smug amusement. “I was merely theorizing, but look at that. You are a pet.”

Wheatley immediately snapped out of it, his optic blazing to life as he flailed his arms. “I—NO—I AM NOT —THAT WAS—I WAS CAUGHT OFF GUARD, THAT DOESN’T MEAN ANYTHING—”

Chell pinched the bridge of her nose, regretting everything.

GLaDOS let out a pleased hum. “ Fascinating. Perhaps I should add a few more enhancements. Maybe program you to purr next?”

Wheatley sputtered, frantically waving his hands. “D-Don’t you dare!

Chell groaned, leaning against the wall again, utterly done. This was her life now.

Wheatley, meanwhile, was still caught between mortification and outrage, his tail betraying him yet again by twitching furiously.

The elevator ride continued in awkward silence. Wheatley, still fuming, had his arms crossed tightly, claws digging into his plating, while his tail twitched behind him in irritated little flicks. Chell, meanwhile, was rubbing her temple, mentally bracing herself for whatever fresh nonsense would come next.

But, surprisingly, it wasn’t Wheatley who spoke.

It was GLaDOS.

“Well,” she said, her voice slow, almost hesitant, “I suppose it’s time for a break.”

Wheatley perked up immediately. “A—A break? ” he repeated, sounding surprised. “Wait, hold on, you actually allow those? Thought you were all about non-stop testing, ‘get back in there,’ ‘try not to die’—you know, all that?”

Chell raised an eyebrow, also a little taken aback.

GLaDOS sighed, as if this was something she really didn’t want to explain.

“Since our little test subject here has willingly decided to live in my facility like some kind of stubborn rodent, I suppose it would be… inefficient to let her burn out,” she admitted coolly. “Unlike you, she actually matters to science. If she collapses from exhaustion, I can’t test her. And since you insist on being permanently attached to her side, I suppose you get a break as well.”

Chell narrowed her eyes. GLaDOS made it sound like she was only doing this out of necessity, not because she cared in the slightest.

And yet, she still seemed oddly reluctant about admitting it in the first place.

A moment later, there was a distant clank somewhere in the facility.

“There,” GLaDOS said flatly. “I sent down food for you. Not because I care. But because you’re useless to me if you starve.”

Chell exhaled sharply through her nose, but she wasn’t about to argue. Instead, as the elevator finally reached its destination, she stepped out, heading toward the familiar resting chamber GLaDOS had begrudgingly set up for her.

Wheatley trailed behind her, still looking utterly baffled by the concept of a designated break. “Huh. Huh! So, uh, how does this work, then? You actually get, like—a proper meal? A whole break? Wow, that’s—honestly, that’s shocking. Didn’t think she’d actually—”

GLaDOS cut in. “Don’t get too comfortable,” she said sharply. “This isn’t for you. It’s her break. The only reason you get one is because you won’t leave her alone. If it were up to me, I’d have you running pointless tasks all night, just to see how long it takes for you to fall apart.”

Wow, ” Wheatley muttered, slouching slightly. “Alright. That’s… yeah, that’s about what I expected.”

Chell rolled her eyes and entered the room.

It wasn’t much—a clean, white chamber with a cot, a small table, and a screen built into the wall, likely for GLaDOS to watch her sleep if she wanted to. A tray of food had been dispensed into a slot on the wall, a dull little beep accompanying it.

Wheatley stood awkwardly in the doorway as Chell sat at the table, picking at her meal in tired silence.

“Y’know,” he said after a moment, “not quite the ‘great escape’ we were aiming for, but, um… better than nothing? Maybe?”

Chell shot him a flat look.

He coughed. “Right. Yeah. Not helping.”

The facility lights dimmed shortly after she finished eating, the room shifting into a low-power state as everything outside fell into shadow.

Chell lay on the cot, curling onto her side with a sigh.

Then, before she could even consider getting comfortable, there was a quiet thud as Wheatley sat on the floor beside her.

And then—he curled up.

Like a giant, metal feline, he tucked his legs under himself, tail wrapping around his form as his optic slowly dimmed.

Chell stared at him in disbelief.

“Oh, you’ve got to be kidding me, ” she thought to herself.

Wheatley, of course, didn’t hear her. He was already dozing off, his frame letting out soft mechanical whirs as he settled in, oddly content to be curled up so close.

Chell groaned, rolling onto her back to stare at the ceiling.

This was her life now.

Testing for GLaDOS. Babysitting Wheatley. Sleeping in a cold, sterile room, listening to the soft hum of Aperture around her.

She shut her eyes.

At least it was quiet. For now.