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Chishiya had always been empty.
This wasn't something strange for him to begin with — he had lived twenty-something years understanding that the hollow space behind his ribs was simply part of the structure that created him. Some people were built with rooms inside them, warm and welcome, while others, like him, were made of corridors that led nowhere, of hallways that stretched on endlessly without ever arriving anywhere meaningful. He had made peace with it the way you make peace with having brown eyes or being right-handed. It was a fact. Facts didn't require grief.
Then that changed when Arisu appeared at the start of those corridors, wandering through the void to look for him, and suddenly it became a problem that demanded a solution, sensible or otherwise.
The thing about emptiness was that you could learn to carry it as long as you never expected it to be filled, and Chishiya had done just that — has spent years distributing that weight just right, continuing moving in this world with a donut hole right where his soul should be, and never letting that slow him down nor make him hesitate when cutting someone else open to see what they kept inside their own chests.
But Arisu chose to walk deeper inside anyway — which was a big mistake, really, that neither of them could afford in the first place.
⋅•⋅⊰∙∘☽ ☆ ☾∘∙⊱⋅•⋅
There was something fascinating in the way Arisu approached life — like he believed the world still had sincerity somewhere in its rotten core, like honesty was a currency everyone possessed in equal measure. He looked at people like they were puzzles meant to be solved rather than traps meant to be avoided, and somehow, against all odds, that naïveté hadn't killed him yet.
It should have been irritating. It should have been a weakness Chishiya could exploit, catalog, and file away under “useful information for later.” Instead, it had become the thing that made him pause at 2 AM when Arisu's weight shifted against his side on the couch, controller abandoned mid-level because exhaustion had finally won out over whatever debugging crisis had consumed his afternoon.
“You're staring again,” the younger man mumbled without opening his eyes, mouth curved in something too smug for someone half-asleep. “Appreciating the view?”
“Actually, I'm considering suffocating you with that throw pillow,” Chishiya retorted, though he did nothing to move away. “It would solve several problems at once.”
“Name three.”
“You're drooling on my shoulder, you've been wearing my hoodie for four days straight, and you keep leaving coffee mugs on every flat surface like you're marking your territory in my home.”
“It's also my home too, you know.” Arisu cracked one eye open, still smiling. “And for the record, none of the things you've listed is suffocation-worthy. You're just looking for excuses to commit first-degree murder against me.”
“I'm a doctor. I could make it look like natural causes.”
“Shun,” the younger man murmured, taking his hand and pressed a gentle kiss to his knuckles, “you work in pediatrics. The only thing you could make look natural is a hissy fit from a child.”
Chishiya huffed — the sound catching somewhere between irritation and something dangerously close to a laugh — and turned his gaze to the darkened TV screen where their reflections blurred together until it was hard to tell where one of them ended and the other began.
⋅•⋅⊰∙∘☽ ☆ ☾∘∙⊱⋅•⋅
A lot of things that Chishiya did in life were closely related to his meaningless self, which meant a lot of things he did were about maintaining the structural integrity of something that wasn't actually there.
He chose medicine because it was the closest he could come to understanding what a human core looked like once all the pretense was stripped away to reveal what they had been protecting all along. He chose pediatrics because children were honest — they screamed when something hurt, cried when they were scared, and their parents' grief was loud enough that he never had to examine whether he felt anything about it himself. He chose casual sex to burn his libido down to nothing when it surfaced — neat, contained, transactional — and he chose Arisu as his lover at the time because they fit together like puzzle pieces clicking into place, clean and obvious, which meant he never had to look too closely at what their relationship was supposed to be.
None of those thing, however, could explain why he kept coming back to them when the equation had already balanced itself a long time ago. It couldn't explain why he still woke up reaching for warm hands in the dark, why he memorized the rhythm of fingers typing in his living room, why he kept their apartment colder than necessary so he had an excuse when their legs tangled under blankets.
So he didn't try to find the answer why.
Instead, he kept his mouth shut, ignored the problem, and hoped the void would repair itself through sheer force of will and enough time left alone.
⋅•⋅⊰∙∘☽ ☆ ☾∘∙⊱⋅•⋅
Arisu had this habit of looking at him like he was standing in the doorway of something fragile, and Chishiya thought — absurdly, bitterly — that if emptiness could bruise, his would have been blackened by now.
It unsettled him in the way soft things always did, because tenderness implied care and care implied expectation, and expectation was where things went to rot. He knew what it felt like to want something so badly it burned — had known it when they were still just bodies in the dark, all gasping breath and reckless fingers, when pleasure was something he could control and feeling was something he could compartmentalize into the hours between midnight and dawn. Wanting, then, had been wild and restless and ultimately empty, which was how he preferred it to be.
Somewhere along the way, though, that whole hypothesis had gone spectacularly wrong, and now he was left with even more equations he had to solve — with Arisu kept making breakfast like it mattered, kept folding his shirts even though he never asked, kept existing in his space with that unbearable patient gentleness. By then, Chishiya found himself cataloging increasingly desperate justifications: oxytocin was a chemical response to repeated proximity, domesticity bred familiarity which bred complacency, he was simply too tired from pediatric rotations to maintain proper emotional distance, and this was simply the consequences of letting someone stay too long in the same bed with you when depression still haunted you like one hell of a potent drug.
And maybe that was why he stayed despite knowing better. Maybe he was just doomed to suffer this unbearable pain for the rest of his soul-crushing life as penance for all the sins he had commited before.
⋅•⋅⊰∙∘☽ ☆ ☾∘∙⊱⋅•⋅
Proximity was something Chishiya always tread carefully.
There were rules to emptiness — unwritten but absolute — and one of them was that you never let anyone get close enough to notice the echo when they spoke to you, the way their words traveled into you and came back changed, hollow-sounding, like they had been shouted into a cave. You smiled at the right moments, nodded at the appropriate intervals, mirrored back just enough warmth that people assumed there was a fire burning somewhere inside you instead of just the reflection of their own heat against cold glass.
Arisu had broken that rule by accident, probably, because that was what Arisu always did — stumbling into Chishiya's life the way he stumbled through doors without checking if the other sides were safe, playing games without reading the instructions and somehow still winning, and now here they were, living together while their sounds slowly filled the cavities that existed in-between his corridors and chased away the loneliness that had always been there within his ribcage.
(They didn't mean anything to me, he always told himself as such.
Then again, he had told himself many things that just simply weren't true.)
⋅•⋅⊰∙∘☽ ☆ ☾∘∙⊱⋅•⋅
Arisu asked him once, in that guileless way that meant he genuinely wanted to know, “Do you think we would have found each other if the Borderland never happened?”
They were already in bed by then, the post-sex haze still clinging to their skin, and Chishiya had considered that question carefully in the way he always did with differential diagnoses. In another world, without the games and the death and the desperation, would their paths have crossed? Would he have noticed one more lost boy among Tokyo's millions? Would Arisu have looked twice at someone like him, who moved through crowds like a ghost, who left no impression because impressions required impact that he never had in the first place?
“… No,” he said once those thoughts had run their course and left nothing behind. “We wouldn't have.”
Arisu went very still. For a long moment, he just looked at him with those wide brown eyes, something fragile and searching flickering behind them. “Do you wish we hadn't?”
And Chishiya, who had spent his entire life choosing honesty over kindness, because honesty was easier, found himself unable to solve that problem. The truth was tangled and sharp-edged, the lie was simple and useless, and neither option would fix the damage he could feel spreading between them like frost across glass.
“Ryō,” he whispered instead, which wasn't an answer but was maybe the closest he could come to one, and Arisu had understood somehow, reaching out to pull him closer until there was no space left for the emptiness to echo at all.
⋅•⋅⊰∙∘☽ ☆ ☾∘∙⊱⋅•⋅
Chishiya learned early that needing things was a structural weakness.
His mother needed his father's approval. His father needed his career. Both of them needed Chishiya to be a certain kind of son — brilliant but not difficult, successful but not demanding — and he had watched them arrange their entire lives around those needs like architects designing a building around a flaw in the foundation, reinforcing and compensating until the whole structure was bent toward supporting something that couldn't actually hold weight.
So he carved that need out of himself the way you would excise a tumor — carefully, thoroughly, without an ounce of hesitation — and did it so young that the scar tissue became part of his baseline, indistinguishable from who he was. He didn't need friends, so he didn't make them. He didn't need validation, so he didn't seek it. He didn't need love, so he didn't even bother learning what it looked like up close, just studied it from a distance the way you would study a chemical reaction through safety glass — interesting, potentially volatile, and certainly not something you wanted to get on your hands.
It was fine. He was fine. He had survived worse than this, and solitude was infinitely preferable to looking too closely at the hollow places inside himself and risking the slow, suffocating misery of realizing how empty they were—
Except that Arisu happened, and suddenly there was a need so huge and terrible it felt like his skeleton was trying to crawl out of his skin, like wild horses were running through the hollow space in his bones, and he didn't know what to do with it except pretend it wasn't happening at all.
The problem with pretending, though, was that it required energy — constant, exhausting energy — and Chishiya had been running on fumes for so long that it was only a matter of time before something finally gave.
⋅•⋅⊰∙∘☽ ☆ ☾∘∙⊱⋅•⋅
Eventually, this rotten thing he had bottled up detonated on a regular Tuesday night, which felt weirdly appropriate somehow.
Arisu had made dinner. That was the first mistake, probably, because domesticity had a way of making his chest feel too small, like his ribs were closing in on the empty space they were supposed to protect. He watched from the doorway as the younger man moved around the kitchen with easy familiarity, humming something off-key, and felt that terrible need rising up again, nauseating and unwelcome.
“You don't have to make dinner tonight,” he said, which was true and also beside the point. “I'm not hungry.”
“Shun.” Arisu said softly. “You haven't eaten since yesterday morning.”
“I'm aware of how time works.”
“That's not—” A pause, careful and hesitant, which was worse somehow than if he had just been angry. “You can't keep doing this.”
“Doing what, exactly?” Chishiya asked calmly, watching as his emptiness ramping back up. “Existing? Working? Should I apologize for having a job that doesn't let me clock out when it's convenient?”
“That's not what I meant and you know it.” The younger man straightened from the counter, turning to face him fully. “You're shutting down again. You haven't looked at me in three days, you sleep on the couch when you think I'm asleep, and now you're doing that thing where you pretend you're fine when you're clearly—”
“Clearly what?” The question came sharp and reckless, something clawing its way up his throat before Chishiya could get a hold of it. “Clearly not performing emotional availability to your satisfaction? Clearly not meeting the baseline requirements for whatever relationship checklist you've invented?”
Arisu went very still at his words, but Chishiya was too far gone to care — too deep in his facts and too stubborn to let them go for fear of collapsing all together.
“There's nothing here,” he continued, pressing his palm flat against his sternum until it hurt to breathe. “There never has been. I thought you understood that.”
For a long while afterward, neither of them said anything, and the apartment felt so quiet Chishiya could hear his own pulse hammering against his eardrums like fists against a locked door.
“Do you actually believe that?” Arisu asked at last, and his voice was so soft it hurt. “That you're always empty?”
“… Yes,” Chishiya breathed. “Yes, that's what I believe.”
“Okay,” the younger man said, and that single word landed like a punch to the solar plexus because it wasn't angry or hurt or disappointed — it was just sad, impossibly sad, and he would rather be cut open without anesthesia than hear that particular flavor of resignation ever again.
But before he could say anything to take it back or deflect like he always did, Arisu just crossed the distance between them and pulled him into a tight, crushing hug.
And that was when his composure broke.
The thing about spending twenty-something years holding yourself together through sheer force of will was that you forgot what it felt like to come apart — forgot that bodies weren't meant to be pushed too far, that bones weren't load-bearing planks, that the void inside you weren't rooms you could just close behind you and pretend they didn't exist. You forgot that eventually, it would come to a breaking point, and when it did, it wouldn't be quiet or controlled or dignified.
It would be exactly like… this.
Chishiya's hands came up to grip Arisu's shirt, fingers twisting in the fabric hard enough that his knuckles went white, and a desperate, painful sob tore out of him like it had been clawing at his ribs for years, waiting patiently for the moment his logic failed him. He tried to breathe through it, tried to compartmentalize and seal it away, but his chest was heaving and his throat was closing and suddenly he was crying so hard he couldn't stand, couldn't think, couldn't do anything other than clinging to the younger man like he was the only thing keeping him from dissolving completely.
“I'm sorry,” he choked out between sobs, words spilling out of him like blood from a wound he hadn't known he was carrying. “I'm sorry, I'm sorry, I'm—”
“Shh, breathe, breathe for me baby,” Arisu murmured, one hand cradling the back of his head while the other pressed firm and steady against his spine. “It's okay. I'm not mad at you. I can never be mad at you.”
But it wasn't okay, because nothing about this was okay — not the way his lungs kept forgetting how to work, not the way his vision blurred and swam until everything was just shapes and colors, not the way his entire walls were collapsing inward like a building that had been built on fault lines all along. He had spent his whole life learning how to breathe around the emptiness, how to move through the world like a normal human being instead of a ghost haunting his own skin, and now all of that training didn't make sense anymore, leaving him gasping and shaking in Arisu's arms like he was dying.
Maybe he was dying. Maybe this was what it felt like when the void finally consumed him whole, when he realized just a little too late that he couldn't actually live forever with his insides emptied out and nothing but empty corridors holding his broken pieces together.
“Oh, my poor baby…” Arisu let out a sigh and peppering kisses against his forehead, against his soaked cheeks, against his trembling eyelids, whispering things that his brain couldn't process beyond the soft, gentle tone. “I'm here. I'm right here. You're safe and I'll never leave you. I promise.”
Chishiya couldn't find the strength to respond to those words, so he clung to the younger man tighter than before, hoping, for the first time in a long, long while, that maybe this didn't have to be the end of his existence.
And that, perhaps, if he allowed himself this much, he might even be all right after all.