Dean flips the page again, frowning. “Yeah, okay,” he mutters to himself. “So either I’m hunting a ghost… or Jason Bourne on demon blood.”

Across the motel room, Sam rubs his eyes. “Dean,” he sighs, “this isn’t supernatural.”

Dean taps the photo. A grainy surveillance image. A man with long dark hair. Metal arm glinting. “You see the part where he doesn’t age?” Dean says.

Sam pauses. “…Okay, that part’s weird.”

Dean stands, already grabbing his jacket. “Monster’s a monster, Sammy.”

The warehouse smells like rust and ocean water. Dean moves silently between shadows, the familiar weight of the Colt in his hand. Something is wrong. Hunters know the feeling. The way your skin prickles when something ancient watches from the dark. But this doesn’t feel supernatural.

It feels…human. 

A sound echoes behind him. Metal shifting. Dean spins— And suddenly the barrel of a gun is pressed against his temple. Cold. Steady.

“You’re not Hydra,” the voice says behind him. Low. Rough. Confused.

Dean slowly raises his hands. “Buddy,” he says carefully, “I got no idea what a Hydra is.”

The gun doesn’t move.

Dean glances sideways. And finally sees him. Bucky Barnes.

Taller than Dean expected. Hair falling into tired blue eyes. The metal arm gleams under the dim warehouse lights. But the thing that stops Dean cold—

The man looks exhausted. Not monstrous. Not demonic. Just… broken. A shell of a soldier. Dean would recognize that stare anywhere. “You’ve been following me,” Bucky says quietly.

Dean shrugs. “You leave a hell of a trail.”

The gun presses harder. “You here to kill me?”

Dean should say yes. It’s what hunters do. Kill the thing before it kills someone else. But Dean studies him closer. The shaking hands. The haunted eyes. The way the metal arm flexes like it’s not even fully his.

Dean has seen that look before. In soldiers. In victims. In himself.

He exhales slowly. “Well,” he mutters. “Was thinking about it.”

The silence stretches.

Bucky’s expression barely changes. “Then do it.”

Dean blinks. “…What?”

Bucky lowers the gun slightly. “Everyone else has tried.”

Dean frowns. “That supposed to make me feel better?”

Bucky stares at the ground. “Would make things easier.”

And suddenly Dean understands something terrible. This man doesn’t think he deserves to live.

Dean sighs and holsters the Colt.

Bucky instantly raises the gun again. “Don’t,” Bucky warns.

Dean points at him.“Yeah, see, that right there? That’s why I can’t kill you.”

Confusion flickers across Bucky’s face. “You hunted me across three states.”

“Yeah,” Dean says. “Thought you were a monster.” He gestures at the metal arm. “Turns out you’re just another weapon somebody else pointed.”

Bucky stares at him. Long. Searching. “Who are you?”

Dean smirks. “Guy who’s been someone else’s weapon before.” He steps a little closer. Not afraid. Not anymore. “You want a tip, Terminator?”

Bucky stiffens slightly at the nickname. Dean shrugs. “Monsters don’t hate themselves this much.”

The warehouse falls quiet again. For the first time in a long time… Bucky lowers the gun completely.

------

The rain hasn’t stopped since the warehouse.

It drums softly against the roof of the Chevrolet Impala as it eats up the empty Kansas highway.

Inside, silence stretches.

Dean Winchester drives with one hand on the wheel, the other draped over the window. Classic rock hums low through the speakers.

In the passenger seat sits the most dangerous man Dean’s probably ever let into Baby.

Bucky Barnes hasn’t moved much since they left the warehouse.

Back straight.

Hands on his knees.

Eyes constantly flicking to mirrors, road signs, tree lines.

Dean notices.

“Relax, Terminator.”

Bucky glances at him.

“You keep calling me that.”

“Metal arm. Murder reputation. Pretty obvious branding.”

Bucky looks back out the window.

Dean sighs.

“You planning to bolt when we stop for gas, or are we actually doing the whole safe haven thing?”

“…You trust me that much?”

Dean snorts.

“Buddy, I let a demon king crash on my couch once.”

He glances sideways.

“You’re practically a golden retriever compared to that.”

Bucky doesn’t respond.

But his shoulders loosen a fraction.

The bunker door groans open.

Fluorescent lights flicker on beneath the massive underground corridors of the Bunker. Dean strides in first like nothing’s unusual. Bucky follows slowly. Eyes scanning everything. Entrances. Angles. Potential weapons.

Dean notices. “Try not to assassinate the furniture.”

Footsteps echo from the library. And then—

Sam appears from between the shelves, holding a book. He freezes. Dean’s back. Which is normal. The six-foot, metal-armed stranger standing behind him? Not normal. Sam blinks. Once. Twice.

Dean drops his keys on the table. “Sammy, good news.”

Sam stares.

Dean gestures casually behind him. “I found the ghost.”

Sam squints at Bucky. “…Dean.”

“Yeah?”

“That’s a man.”

“Technically.”

Sam slowly closes the book. “Why is there a metal arm.”

Dean shrugs. “Long story.”

Sam pinches the bridge of his nose. “You left to hunt a possible supernatural assassin.”

“Correct.”

“You were gone three days.”

“Sounds right.”

“And you came back with—” Sam gestures vaguely at Bucky. “—whatever that is.”

Dean turns. “Hey.” Bucky stiffens. Dean points between them.“Sam, this is Bucky.”

Bucky’s eyes narrow slightly. “Just Bucky.”

Sam stares. “…Okay.”

Dean grins. “Bucky, this is my brother.”

Sam extends a cautious hand. Bucky hesitates. Then shakes it. Sam immediately winces. “Jesus—”

Dean bursts out laughing. “Super soldier handshake, Sammy.”

Sam rubs his hand. “You brought a super soldier home?”

Bucky quietly steps back. “You can still turn me in.”

Sam blinks. “Turn you in to who?”

Bucky shrugs. “Government. Avengers. Whoever.”

Dean waves a hand. “Pass.”

Sam looks between them. Then back at Dean. Then the metal arm. Then Dean again. The realization dawns. Slow. Painful. “Oh my God.”

Dean smiles.

Sam points at Bucky. “You brought home a stray.”

Dean scoffs. “He’s not a stray.”

Sam gestures wildly. “You picked up a deadly government assassin on the side of the road!”

Dean shrugs like it was a normal, regular Tuesday and they were only discussing dinner plans.“He looked sad.”

Sam stares at him.

Bucky looks… mildly confused.

Dean crosses his arms. “What?”

Sam throws his hands up. “Dean, you can’t just adopt a super soldier!”

Dean tilts his head. “Why not?”

Sam opens his mouth. Stops. Sighs deeply. “…Fine.” He turns to Bucky. “You hungry?”

Bucky blinks. “…What?”

Dean smirks. “Told you.”

Sam points toward the kitchen. “We have food. And a shower. And a library if you’re the reading type.”

Bucky stands there for a moment. Like the concept is completely foreign. Safe places usually come with chains. Or cages. Or interrogation.

Dean claps him on the shoulder. “You’re good here, man.”

For the first time in a long time… Bucky looks uncertain in a different way. Not hunted. Not threatened. Just… unsure what to do with kindness.

Sam watches him carefully.

Then leans toward Dean and mutters: “Please tell me he’s not going to murder us in our sleep.”

Dean smirks. “Nah.” He glances at Bucky. “Pretty sure he’d already have done that.”

Bucky almost smiles.

------

The library of the Bunker is quiet except for the turning of pages. Sam has a laptop open, several old intelligence documents spread across the table. Across the room, Bucky sits stiffly in a chair, watching the floor like a man waiting for a verdict.

Dean paces. Dean hates this part. Research.

Sam suddenly goes still. “…Dean.”

Dean sighs. “Please tell me you didn’t find out he explodes or something.”

Sam slowly turns the screen. “I found Hydra programming files.”

Bucky’s head snaps up.

Dean notices immediately. “Hey, hey—easy.”

Sam hesitates. “There’s… something else.”

Dean squints. “What?”

Sam swallows. “They controlled him with trigger words.”

The room goes completely still. Bucky’s breathing changes. Shallow. Tight. “Don’t,” he says quietly.

Sam immediately backs off the keyboard. “I’m not going to say them. I don’t speak German or Russian.”

Dean walks closer to Bucky slowly.

“Bucky.”

Bucky’s metal hand curls into a fist. “Sometimes… they make you say them. To prove it works.”

Dean’s voice softens. “No one here is doing that.”

Sam closes the laptop gently.

Bucky stares at the table. “…You should keep them.”

Dean frowns. “For what?”

“In case I lose control.”

Dean scoffs immediately. “You’re not a weapon here.”

Bucky doesn’t look convinced. But he doesn’t argue. And that’s a start.

--

Later that week, Dean stands proudly beside Baby in the bunker garage. Bucky studies the car like it’s some sacred artifact.

Dean spreads his arms. “Alright. Rule number one.” Bucky raises an eyebrow. “You touch her wrong, I bury you under the bunker.”

Bucky tilts his head. “…You’re joking.”

Dean stares.

Bucky pauses. “…You’re not joking.”

Dean tosses him a rag. “Wipe the chrome.”

Bucky catches it effortlessly. His metal hand moves with careful precision over the bumper.

Dean watches. “You ever work on cars?”

Bucky shrugs. “1940s Brooklyn.”

Dean’s face lights up. “Atta boy.”

Soon they’re elbow-deep under the hood. Oil on their hands. Dean explaining engines like they’re living creatures. Bucky listens carefully. For the first time since he arrived… He looks calm.

Dean notices. “Feels good, right?”

Bucky nods slightly. “…Quiet.”

Dean grins. “Yeah, you’ll enjoy it here.”

---

It happens three nights later. Dean wakes to the sound of metal slamming. He grabs a knife and moves down the hallway. A door is open. Inside the room— Bucky is sitting on the floor. Breathing hard. Metal arm dented into the wall beside him.

Dean lowers the knife. “Nightmare?”

Bucky stares ahead. “I remembered another mission.”

Dean sits beside him. No questions. No pushing. Just quiet.

After a moment Bucky speaks. “I killed people who were begging.”

Dean nods slowly. “Yeah.”

Bucky looks at him. “You?”

Dean exhales. “I’ve done things I’m not proud of.”

Silence settles again. Then Dean nudges his shoulder. “Good news though.”

Bucky glances at him. “You’re stuck with us now.”

Bucky almost laughs. Almost.

----

The bunker alarm suddenly screams. A sharp, mechanical wail that echoes through the stone halls of the Bunker

From down the corridor comes the unmistakable shout of Sam. “DEAN!”

Boots pound against the floor as Dean Winchester bolts from the garage hallway, wiping motor oil from his hands onto a rag. 

“Yeah, yeah, what is it—” He skids into the war room.

Sam is already standing at the console, staring at the security monitor like it personally offended him. “Tell me I’m hallucinating,” Sam says.

Dean squints at the screen.

Outside the bunker entrance stand three very distinct figures.

One of them holds a shield.

Dean leans closer. “…Well.”

The man at the front—tall, broad-shouldered, impossibly square-jawed—steps closer to the camera. Steve Rogers.

Behind him stand a red-haired woman with an assessing stare—Natasha Romanoff—and a man wearing sunglasses who seems way too amused for someone standing in the Kansas wilderness. Tony Stark lifts his hand and waves directly at the camera.

Dean slowly leans back in his chair. “Sammy.”

Sam doesn’t look away from the screen. “Yeah?”

Dean gestures vaguely at the monitor. “Think we accidentally kidnapped an Avenger.”

Sam groans, dragging a hand down his face. “Dean, you can’t kidnap Avengers.”

“I didn’t kidnap him,” Dean protests. “He got in the car voluntarily.”

Sam presses the control panel button.

A distant mechanical rumble echoes through the bunker as the hidden entrance unlocks.

“Too late now,” Sam mutters.

“Door’s open.” Dean folds his arms. “Well… this should be fun.”

It doesn’t even take a minute. Footsteps echo down the corridor. Then suddenly Three strangers step into the war room like they just walked into the world’s strangest underground library.

Tony immediately looks around with open fascination. “…Okay, wow,” he says. “Secret bunker in the Midwest. Very dramatic. I’m into it.”

Natasha’s eyes sweep the room in a second, cataloguing exits, weapons, angles.

Steve doesn’t look at any of that. He’s staring at the brothers. Specifically Dean.

Dean raises his hands slightly. “Before you say anything, in my defense—”

Another set of footsteps approaches from the hallway. Slow. Measured. The room shifts. Bucky steps into the doorway. He stops the moment he sees them. His eyes lock instantly on Steve.

Something fragile flickers across his face—shock, disbelief, something painfully hopeful.

Steve’s breath catches. “Bucky?”

No one moves. Not Sam. Not Natasha. Not Tony.

Dean looks between them. Then leans slightly toward Sam. “…Well this just got awkward.”

Tony glances between the two soldiers, then at Dean. “Okay,” he says. “New question.” He points at the Winchesters. “Who are the flannel guys who apparently stole Captain America’s best friend?”

Dean shrugs. “Hunter.”

Sam sighs. “Hunters,” he corrects.

Steve doesn’t take his eyes off Bucky. “You’re safe here?” he asks quietly.

Bucky hesitates. Then nods once. Steve’s shoulders relax just a fraction.

Natasha crosses her arms. “So,” she says calmly. “You want to explain why the Winter Soldier is living in a secret bunker with two men who look like they run a classic rock radio station?”

Dean grins. “Funny story.”

----

The war room of the Bunker is quieter now. The tension that filled the air when the Avengers first arrived has settled into something calmer—something cautious, but not hostile.

Tony is halfway through a beer he definitely helped himself to from the bunker fridge. Natasha leans against the map table, arms crossed but relaxed. Across from them stand the brothers. Sam with his laptop. Dean leaning back in his chair like this whole situation isn’t surreal.

But the center of the room— That’s where the real moment sits.

Steve and Bucky stand facing each other.

For a long moment neither of them speaks.

Then Steve exhales slowly. “You disappeared again,” he says.

Bucky looks down at the floor. “…Wasn’t planning on sticking around anywhere.”

Steve nods slightly. “I know.”

Bucky glances toward Dean.

Dean lifts his hands. “Hey, don’t look at me. You got in the car.”

That earns the smallest huff of a laugh from Bucky.

Steve notices. And that tiny sound means everything.

Tony tilts his head. “You kidnapped him with kindness.”

Dean shrugs. “Works on strays.”

Sam groans softly.

Natasha’s eyes move between Bucky and the Winchesters. “You didn’t turn him in.”

Dean snorts. “To who?”

Tony raises a hand. “Technically—”

Dean points at him. “No offense, Iron Man, but we deal with monsters, ghosts, demons—” He gestures toward Bucky. “This guy ain’t one. If anything, he’ got my respect. He’s a war hero, a vet just like my pops.”

The room falls quiet again.

Steve studies Dean for a moment. Something like respect flickers in his eyes. “You protected him.”

Dean shrugs again, suddenly uncomfortable. “Guy needed a couch.”

Bucky’s voice breaks the moment. “…I didn’t know where else to go.”

Steve steps closer. “You’ve got somewhere now.”

Bucky hesitates. His gaze drifts around the bunker. The long library tables. The quiet halls. The garage where the Impala  sits. For the first time in decades… He looks like someone standing inside a home. Not a prison. 

Dean watches him. Then scratches the back of his neck. “Well…” He glances between the Avengers and his brother. “Guess the question is—” He jerks a thumb toward Bucky. “You taking him back, or what?”

Steve looks at Bucky. Not answering for him. Just waiting.

Bucky takes a long breath. “…I think I’d like to stay here for a while.”

Tony raises his eyebrows. “In the spooky Kansas bunker?”

Dean grins. “Hey.”

Sam crosses his arms. “It’s a nice spooky Kansas bunker.”

Steve smiles faintly. “Then that’s where you stay.”

Relief passes through Bucky’s shoulders like a weight finally dropping.

Natasha nods once. “Good choice.”

Tony finishes his beer.

“Well,” he says, setting the bottle down. “This has been the weirdest road trip I’ve ever taken.”

Dean smirks. “You ever fought a vampire?”

Tony pauses. “…I’m listening.”

Sam groans again. But Steve laughs quietly. And Bucky— For the first time since he arrived— Actually smiles.

Later that night. The bunker halls are quiet. Dean leans against the hood of the Impala, wiping grease from his hands. Footsteps approach. Bucky stops beside him. For a moment they just stand there.

Then Bucky says quietly, “…Thanks.”

Dean glances at him. “For what?”

“For not killing me.”

Dean scoffs. “Yeah, well.”

He tosses the rag aside and pats the Impala’s hood. “Someone’s gotta teach you how to properly respect a classic car.”

Bucky looks at the car. Then at Dean. “…You gonna keep calling me Terminator?”

Dean grins. “Oh absolutely.”

Bucky shakes his head slightly. But he’s smiling again.

Down the hallway, Sam calls out— “Dean! Tony found the weapons vault!”

Dean groans. “Oh no.”

Bucky snorts softly.

Dean pushes off the Impala. “C’mon, metal arm.” He gestures down the hall. “Welcome to the family.”