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The Space Between Heartbeats

Summary:

Hyunjin never thought he'd be a parent.

Not really. He was raised on silence and expectations—not lullabies and blanket forts, being the only child he is. But love has a way of blooming in quiet places, and somewhere between shared toothbrush cups, midnight ramen, and tiny plastic spoons, he realizes he wants more.

Changbin has always known. That his heart was too big for just music and paint-streaked kisses. That there was room—so much room—for someone else. For tiny socks and sleepy giggles and the kind of love that makes space feel infinite.

So they start looking. And then they find him.

Jongsoo. Four months old. Fierce, fragile, and already theirs.

This is the story of how two husbands fell in love again—this time with a baby who changed everything.

It’s about late nights, group chat chaos, sticker packs, old fears, new joys, and learning to build a life that’s soft, safe, and sacred.

Because the greatest masterpieces aren’t always painted.

Sometimes, they’re held.

Notes:

hehe and we're back to add another lore and layer to this AU!

sorry ya gurl's busy with Finals months (yes, month but that's normal in my field lmao) and I've had a few series going on so we're on a roster now HAHAH and this one is joining the club, idk how many chapters this is but most of the notes are done i just have to edit and chop at the right parts- i'm rambling now, i should stop

this one a bit's serious than the others like most origin stories are haha send our favorite fictional baby some love and hugs!

Disclaimer: This is a work of fiction, the character depiction is purely of imagination. I do not owe anything except for the plot of the story.

Chapter 1: Starlost

Chapter Text

It started in a grocery store.

Not in some grand epiphany, not in a planned conversation or one of those pivotal milestone moments people usually talk about. No. Just fluorescent lights. A soft hum of refrigerators. The subtle citrus of cleaning products and the muted chatter of lives passing by in scattered aisles.

Hyunjin had only meant to pick up soy milk, strawberries, and paper towels. The kind of list you could write half-asleep. The kind of day you lived without thinking too hard. Just errands while Changbin worked a studio session across town. His headphones were still slung around his neck, one hand scrolling absently through the weekend to-do list on his phone.

It should’ve been an ordinary day.

But it happened in the juice aisle.

He hadn’t meant to stop—but he did. Just for a second. Long enough to hear the laugh.

There, at the end of the row, was a man crouched down in front of his daughter. She was maybe three years old, if that. Round cheeks flushed from the cold outside, arms bundled into a sequined pink jacket, curls bouncing in twin puffs as she clutched a juice box like it was a Grammy microphone. She was singing something—loud, high-pitched, off-key. Absolutely fearless.

And her father? He watched like she was a sunrise. Not rushed. Not embarrassed. Not even distracted. He was simply there. Fully. Eyes soft. Knees creaking with the weight of waiting, but not once looking away.

When she spun in a little circle—twirling like her sneakers were glass slippers—he reached out with practiced ease, catching her before she could wobble. No scolding. No sigh. Just a quiet hand keeping her upright.

Hyunjin stopped. Something in him stopped too.

He smiled at first. Because how could you not? The moment felt… suspended. Bubbled in softness. Like the kind of thing you pass by without meaning to but remember for the rest of the week.

And then, without warning, a pressure bloomed behind his ribs.

It wasn’t sharp. It didn’t hurt. But it pulled. Gentle at first—like a thread catching at the corner of his chest. A tug. A flicker of something unspoken.

He didn’t even realize he’d gone still. That he’d stopped scrolling, fingers loose around the cart handle, lips slightly parted like the sight had taken the air from them. The world around him dimmed—colors dulled, movement blurred. He wasn’t even in the juice aisle anymore. He was somewhere else entirely. In some strange, quiet corner of his heart that had been sleeping until now.

And suddenly, all he could hear was that laugh.

That little girl’s giggle, pure and high and delighted. Her joy had no filter. No ceiling. It didn’t shrink to fit inside the space she was in—it expanded, like sunshine through glass. Like love before you even know how to name it.

Hyunjin swallowed hard.

He couldn’t explain it. Didn’t even try. But the ache lingered as he forced himself to push the cart forward. Past the cereals. Past the bread. Past the automatic checkout beeps and the polite nod of the cashier. Even as he paid. Even as the receipt curled into his hand like a slow ribbon. Even as he walked through the parking lot with his bag handles cutting soft indents into his palms.

The ache didn’t leave.

It followed him into the car. Into the silence that filled the space when he turned the engine and didn’t start it yet.

He sat there for a long moment. Keys in the ignition. Breath fogging the window.

He should go.

But he could still hear it.

That laugh. That sparkle. That freedom. That dad’s quiet, reverent smile.

And somewhere deep in the quietest part of himself, Hyunjin realized he wanted to hear that sound again.

Maybe not today.

Maybe not tomorrow.

But…maybe one day.

And for the first time in a very, very long time—he didn’t feel afraid of that thought.

He felt ready to hold it.

Even if it hurt a little.

Even if it meant everything would change.




That night, as he waited for the rice cooker to finish its gentle hum of steaming, Hyunjin found himself remembering another laugh.

It was different from the one in the grocery store. Smaller. Shriller. Louder in the way that joy always is when it’s still learning how to be gentle.

Sua.

It had been a few months ago—Chaemin had called in a panic, something about an the hospital being understaffed and there a mass casualty that needed them and there's no guarantee if she'll be home for the next 2 days, and Changbin had answered with a calm “Of course. Bring her over.”

Hyunjin had hesitated.

Sure, they've watched over Sua a couple of times but not like this—for a few days with them. He wouldn’t admit it at the time, but he’d been scared. Not of Sua—never of her. But of himself. Of doing it wrong. Of freezing. Of not knowing what to say when a tiny human started crying or coloring on the walls or asking too many questions.

But it was Changbin’s niece. And more than that—it was a chance. A soft nudge from the universe, maybe. And he wanted to try. Just once. Just to see.

And so, he had.

He remembered the sound of tiny feet slapping against the tiles as she ran into their home. The way her hair bounced with every step. How she screeched “Un’ca Hyunnie!!!” down the hallway like it was a battle cry of affection. Like just seeing him was the most exciting thing that had happened to her all day.

He’d blinked. Stunned. And maybe a little flustered when she tackled his legs in a hug before even saying hi to Changbin.

She’d called him her favorite grown-up artist within the first ten minutes.

And it was wild—how fast she made herself at home.

He remembered sitting on the living room rug with her later that night, the two of them surrounded by a sea of glitter crayons and coloring books she brought in a unicorn-shaped backpack. She had planted herself beside him with the authority of a queen, legs folded criss-cross applesauce, tongue sticking out in concentration as she colored a mermaid’s hair green. When she reached into her crayon pile and handed him the violet one, she said, “This one’s yours. It’s your color. You’re so pretty, like a flower.”

Hyunjin had stared at her. At the little fingers curled around the crayon. At the sincerity on her face.

He didn’t know what to say.

He’d never felt more seen by a child in his life.

He remembered coloring beside her, letting her narrate their entire drawing process like a director on a film set. He remembered her dramatic gasp when he outlined a star too close to the sun. The way she leaned over and patted his arm like, “It’s okay. We’ll just say it’s an eclipse.”

And he remembered her trying to braid his hair later, sitting behind him on the couch with all the grace of a squirrel learning choreography. It had been messy. Lopsided. Full of love. She’d hummed while she worked, made up songs about sparkles and dragons and boys with long pretty hair. He let her. He didn’t move.

She fell asleep against his chest sometime after that. Mid-sentence. Talking about how unicorns definitely ate marshmallows for breakfast.

He hadn’t wanted to move.

That night had been magic in a way Hyunjin didn’t know how to name.

He hadn’t felt afraid. Not of messing up. Not of being enough. Just present. Just there. And now, months later, with the rice cooker beeping softly in the background and the apartment bathed in warm evening stillness, he felt that ache again.

Stronger this time.

Not sharp. Not painful.

Just full.

Like something in him had opened. Like a door that had been closed for too long had finally cracked, and all the warmth waiting behind it was quietly spilling through.




The kitchen was quiet.

Not silent, but soft. Familiar. The kind of quiet shaped by repetition and comfort—by the sound of scallions hitting the chopping board, the slow bubbling of rice in the cooker, the way the overhead light hummed faintly like it, too, had learned to be gentle over time.

Hyunjin moved on instinct.

Knife in one hand. Dishes in the other. He turned toward the drying rack to put a bowl away, halfway through calculating how many dumplings to thaw, when his hand stopped midair.

There, nestled between two mismatched mugs, was a tiny pink spoon.

Hyunjin blinked.

Sua’s.

She must’ve left it the last time she visited. A weekend ago, maybe two. He hadn’t even noticed it before. But now—now it stared at him like it had always been waiting to be seen.

He reached out, thumb brushing softly over the ridged plastic handle. There were still faint traces of sticker residue on the grip—Sua had once covered it in rainbow smileys, peeled them off, and then declared it “even better now because it sparkles like your eyes, Unca Hyunnie.” And suddenly—just like that—his chest ached again.

Not the kind of ache that twinges and fades. This was heavier. Thicker. Like something inside him had swelled too wide for the bones around it.

He didn’t say anything. Didn’t have to.

Because right then, Changbin walked in behind him, fresh from his shower, damp hair curling around his temples, holding a dish towel and humming something under his breath.

He saw the spoon. Saw Hyunjin’s face. Said nothing.

Just stepped close enough that his shoulder brushed against Hyunjin’s, took the spoon from his hand with the most reverent touch imaginable, and quietly tucked it into the drawer like it was the most sacred thing in the world.

Then he smiled.

Small. Soft. Easy.

And it knocked the wind out of Hyunjin.

Because it wasn’t just any smile—it was that smile. The one he’d seen before, when Sua fed Changbin a soggy gummy bear and called it her “super hero power treat.” The one he gave her when she said, “Unca Bin, I love you so much I might explode like spaghetti.”

The kind of smile that held worlds in it. Patience. Wonder. Adoration.

Hyunjin’s heart did a full somersault in his chest. His fingers gripped the edge of the sink. Because God—it was stupid, stupid, how even after all these years, Changbin could look like that and still make him feel seventeen again. Like he’d just fallen in love. Like he was falling again.

Something shifted.

The ache in his chest deepened—not because it hurt, but because it was expanding. Making room.

His mind flashed, unbidden, to all the small, gentle ways Changbin had loved Sua like she’d been his since the beginning.

He thought about how Changbin used to brush her hair into uneven pigtails while she sang off-key show tunes at the top of her lungs—and never once told her to be quiet. He just nodded along like she was auditioning for Broadway.

How he tied her sneakers backwards every time, double knots included, and still kissed her forehead like she’d just won an award for best-dressed.

How he wiped ketchup off her nose once with the sleeve of his hoodie instead of a napkin—because she said it was itchy and paper was scratchy and only softness was allowed.

How he tucked her in that night on their couch, humming lullabies Hyunjin didn’t even know he remembered, and looked at her like she’d painted the stars herself.

And even more than all that—

Hyunjin remembered the way Sua looked at him.

Like he was magic.

Like he was made of constellations and rare candy and bedtime story spells. Like he was her favorite color and her favorite person all rolled into one.

That look had always scared him.

Because he didn’t know if he could ever live up to it. Didn’t know if he could ever hold that kind of love without breaking it.

But now?

Now, it didn’t scare him.

It made him want more.

Not just the spoon. Not just the laughter or the glitter or the way Sua once fell asleep on his chest while drooling on his shirt and calling it “magic.”

He wanted the more he and Changbin used to whisper about late at night. Quiet, dreamy conversations made under shared blankets and between kisses—about what it might look like to raise someone together. About strollers and snack packs and scraped knees. About a home filled with drawings on the fridge and a tricycle by the front door.

He remembered it vividly now.

That night they’d lit candles for no reason and shared a bottle of wine, and Changbin had whispered, “Someday. When we’re ready, let’s start figuring it out. Let’s build it. The whole thing. A family.”

And Hyunjin had nodded into his shoulder, heart trembling, because he wanted it too—wanted it so badly it scared him.

But life, as it always did, had taken over. The commissions piled up. The projects kept coming. The calendar filled with events and releases and late studio nights. And somehow, the idea of starting had quietly faded to the edges. Not forgotten—but buried beneath responsibility.

Until now.

Until a pink spoon.

Until the tiny curve of Changbin’s smile and the steady beat of love in the kitchen air stirred something back to life in him—something louder this time. More insistent.

He didn’t just want.

He was ready.

It was quiet in the kitchen still. The rice cooker let out a soft click. Somewhere down the hallway, the sound of their framed photos rattled faintly as the wind pushed against the window.

And Hyunjin just stood there, staring at that drawer where the pink spoon disappeared.

Want blooming in his chest like something sacred.

Like something he'd never dared name until now.

He glanced at Changbin again—who was still standing beside him, just humming softly, oblivious to the way Hyunjin’s soul was reconfiguring in real time.

And Hyunjin?

Hyunjin was sure of exactly one thing.

He wanted that smile every day.

He wanted a spoon on the drying rack again.

He wanted to know what it meant to build a life where that kind of love never had to leave when the weekend ended.

He wanted more.

He wanted it with Changbin.

And this time, he was ready to begin.




That night, he dreamed.

It wasn’t vivid. Not loud or sprawling or heavy with detail. Just warmth.

He was holding someone—small and solid and real. A child. He couldn’t see their face. Couldn’t even tell if they were speaking words or making sleepy noises. But he remembered the weight of them. The honest kind. The kind that said, I trust you. I’m safe here. The way their tiny limbs curled against him, instinctive and soft, like they'd done it a hundred times before.

They let out a sigh. A flutter of breath against his neck. Then something barely whispered. Unclear. Fuzzy like a half-formed thought. But Hyunjin felt it more than he heard it.

In the dream, he smiled.

He pressed a kiss to their hair—soft and fine, like whispers of silk—and murmured something back. He didn’t know what. Maybe it was their name. Maybe it was a promise. Maybe it was just “I’ve got you.”

Then he woke.

And the ache didn’t feel like an ache anymore.

His chest was tight, but not with panic. His pillow was damp, but he hadn’t felt himself crying. He was just… full. Like his body had carried the dream too gently to disturb it, even as it ended. He sat up slowly, hands fisting the sheets. Breathing hard. Letting it hit.

Because it had hit.

All of it.

Not fear.

Not hesitation.

Not doubt.

But longing.

A deep, resounding, utterly unshakeable yearning that didn’t leave him hollow—it left him whole. For the first time in a long time, it felt like the puzzle piece he’d been turning over in his chest had finally clicked into place.

He didn’t just want to hold someone anymore.

He wanted to be held in return.

By something real. Something lasting. Something chosen.

He wanted the feeling he had in that dream—of a child curling into his arms and belonging there. Not by accident. Not by chance. But by love. By intention.

By a family they hadn’t met yet, but that his heart already recognized like a melody he somehow knew all the lyrics to.

And in that quiet morning light, still wrapped in the remnants of a dream that felt more like a memory waiting to happen, Hyunjin knew.

He was ready.

Finally, completely—beautifully—ready.

Changbin was making coffee when Hyunjin padded into the kitchen the next morning. The quiet kind of morning—muted light spilling across the counter, the faint hiss of the kettle, the soft hum of the city still waking. Hyunjin was a slow shuffle of bare feet and too-long sleeves, hair a cloud of sleep-mussed disarray. There were shadows beneath his eyes. Deeper than usual. Like something had kept him up, gnawed at him all night.

Changbin noticed immediately. Of course he did.

He always noticed when it came to Hyunjin.

“You okay?” he asked softly, already reaching for a second mug.

Hyunjin didn’t answer right away. He just moved like someone in water—heavy and slow and still half-dreaming. He sank into the kitchen chair as though it had taken the last of his strength to get there.

Changbin placed the coffee in front of him, silent, warm, steady. He didn’t add anything yet—just waited.

He grabbed the sugar container from the cabinet, twisting the lid off with one hand.

That’s when Hyunjin finally looked up.

His eyes were glassy. Not crying—just full. Full of something thick and quiet and unbearably tender.

Changbin froze mid-motion.

And then Hyunjin whispered, so softly it almost got lost in the stillness between them: “I think I’m ready.”

Changbin’s hand faltered. The spoonful of sugar missed the cup and spilled over the counter a little.

He stared.

“Ready?” he echoed, dumbly. “For what?”

Hyunjin smiled. It was a small thing. Fragile. Soft at the edges. But it was brave. It was full of quiet, steady courage. Of love. Of longing.

“To start looking,” he said. “To find our baby.”

And that was it.

That was all it took.

Changbin didn’t even think. His body moved before his brain could catch up. The sugar spoon clattered to the counter, and suddenly he was crossing the space between them, dropping to his knees beside Hyunjin, wrapping his arms around him so tight it knocked the breath out of both of them.

He buried his face into Hyunjin’s neck—and broke.

Ugly crying. Full-body crying. The kind that rattled him down to the marrow, made his shoulders quake and his hands shake and his throat give out in choked sobs.

Because he remembered.

He remembered Hyunjin in the early days of their relationship, whispering, “I don’t know if I’d be good at it… I didn’t grow up with much softness. I don’t want to mess a child up.”

He remembered nodding, promising it was okay, that they’d figure it out someday—or maybe not at all.

And he remembered all the almosts.

All the maybes.

All the “someday, when I’m ready.”

And now, here Hyunjin was—sleepy-eyed and vulnerable, voice barely above a whisper, but arms wrapped around Changbin like he was the only thing in the world that mattered.

Saying Let’s find them.

Changbin clutched him tighter, overwhelmed. The pressure that had built over years, quiet and patient, spilled out all at once. The longing he’d tucked under his ribs and dared not give shape to. The ache of love with nowhere to land—finally given direction. A future. A door cracking open.

His mind raced: We’re going to be parents. We’re going to find them. We’re going to love them. All three of us. We’re going to be a family.

And underneath all that noise was something even louder.

He chose this. He chose me. He wants this—with me.

They stayed like that for a long time.

On the kitchen floor. Wrapped up in each other. The spoon still sitting on the counter. The coffee cooling. The world turning softly outside the window.

They didn’t need words.

They didn’t need a plan yet.

They just needed this moment.

Because they were ready.

And soon—so soon—they’d find their way to the child who was already meant to be theirs.

Together.