What’s Mine Doesn’t Leave
Winteragent/ Bucky x John
Yelena/Ava/Bob/Bucky/Alexei/John
Please DNI if under the age
The Watchtower’s 85th floor had become a strange kind of home, whether any of them wanted to admit it or not. Val’s “family bonding” experiment meant they all lived on top of each other—suites branching off a shared hallway, communal kitchen and lounge always occupied by someone. Privacy was an illusion. Super-hearing turned every moan, every argument, every late-night fridge raid into public knowledge.
There was no masked enforcer lurking in the background—when Val wanted control, Yelena handled it openly, and when something needed to disappear quietly, Ava took care of it.
Bucky and John had been fucking for months—raw, violent, no-strings sex that started as hate and slowly turned into something neither wanted to name. They kept it quiet at first. Midnight visits, leaving before dawn. No visible marks, no public touches. Just release. But John had never been good at rules he didn’t like.
Bucky’s five-day black-bag op in Eastern Europe left John crawling out of his skin. The serum turned downtime into agony; he needed friction, pain, dominance. He jerked off in the shower to memories of Bucky’s vibranium grip, woke hard dreaming of that cold hand choking the breath from him. Nothing satisfied.
So when Bob Reynolds wandered into the communal kitchen at 2 a.m.—shirtless, sleepy-eyed, asking if John wanted to “blow off some steam”—John didn’t hesitate.
They ended up in Bob’s suite. Bob was careful, almost tender—kissing down John’s torso, checking in constantly, fucking him slow and deep on clean sheets. It was good sex. Kind sex. It was everything John didn’t crave. He wanted to be wrecked. Wanted bruises that lasted weeks. Wanted to feel thoroughly used and irrevocably owned. Most of all, he wanted Bucky to find out and snap. Mission accomplished.
Yelena figured it out from Bob’s dazed, satisfied grin in the elevator the next morning. By breakfast, the whole floor knew. Ava smirked over her coffee. Alexei boomed congratulations at Bob loud enough to echo down the hall. The gossip spread like wildfire. Bucky returned two days later.
He stepped off the elevator looking worn—hair longer, stubble heavy, eyes shadowed. He dropped his duffel outside his door, nodded once at Yelena in the kitchen, and vanished into his suite without a word.John watched from the lounge, pulse racing. He waited. Bucky didn’t emerge. So John poked the bear.
Team movie night came—some loud, dumb action flick Alexei insisted on. The lounge was crowded: Red Guardian taking up half the sectional like a hibernating bear, Yelena curled in an armchair with a bowl of popcorn, Ava half-phased through the ottoman for laughs, Bob perched awkwardly on the edge of a chair like he’d rather disappear.
John strolled in late, wearing low-slung gray sweats and a tight black tank that clung to every muscle. He dropped onto the loveseat right beside Bucky, thigh pressing deliberately against Bucky’s, and stretched with deliberate laziness.
“Rough trip?” John asked, voice carrying. “You look beat. Good thing some of us found productive ways to kill time.” Bucky went statue-still. The metal arm whirred faintly.
John leaned in, lips grazing Bucky’s ear. “Bob’s got incredible stamina. Fucked me twice without needing a breather. You should ask him for pointers.” Bucky’s inhale was sharp enough to cut glass. Then he exploded.
The vibranium hand flashed out, fingers clamping around John’s throat. Bucky surged up, dragging John with him and slamming him into the nearest wall. Reinforced plaster cracked. Popcorn scattered like confetti. The room went dead silent.
John’s heart hammered against cold metal, cock already hard and obvious in his sweats. His grin was pure, unrepentant brat—wide, taunting, thrilled. “You jealous little slut,” Bucky snarled, voice low and deadly. “You planned this.” John licked his lips. “Prove it.”
Bucky’s grip tightened until stars burst behind John’s eyes. Yelena moved first, sharp and decisive—grabbing Alexei’s arm with a clipped “Out. Now.” Ava went fully solid just long enough to haul Bob toward the door, expression unreadable. Bob muttered apologies as he fled.
The door slammed. They were alone. John wheezed, still smirking. “Gonna kill me, Barnes? Or just gonna hold my neck all night like a creep?”
Bucky leaned in until their foreheads touched. “You want to be punished that bad? You want me to break you for running to Bob?” John’s voice was barely a rasp. “Yes. Ruin me. Fuck me so hard no one else will ever feel good enough again. Make this hole yours forever.”Something savage ignited in Bucky’s eyes.
He released the throat only to fist John’s hair and haul him down the hall. John stumbled eagerly, breathless laughter bubbling out. Bucky kicked his suite door open, shoved John inside, and locked it behind them. Clothes didn’t survive. Bucky ripped John’s tank clean in half. Sweats were yanked down and torn at the seams. John clawed at Bucky’s shirt—buttons pinged across the floor.
Bucky manhandled him face-down over the arm of the couch, pinning both wrists at the small of his back with the unyielding metal hand. “You want to be ruined?” Bucky’s voice was dark velvet and venom. “I’ll destroy this greedy little cunt until you can’t walk without remembering exactly who owns it.”
John moaned shamelessly, pushing his ass up. “Do it. Make me regret ever letting anyone else near me.”Bucky spat into his palm—no patience for lube—and shoved two fingers in rough. John hissed, squirming, but arched back greedily.
“Pathetic,” Bucky degraded, twisting deep. “Couldn’t last five days without cock. Had to go begging Bob to fill you up like the desperate whore you are.”John laughed breathlessly. “He was gentle. Held my hand. Asked if I was okay. Bet you can do better.”
Bucky added a third finger brutally, stretching him wide. “Keep that mouth running, brat. I’ll fuck the attitude right out of you.” John sobbed into the cushion, tears starting already. “Please—Daddy—” The word fell heavy.
It meant: I’m terrified you’ll never want to keep all of me. So take whatever you need. Ruin me if that’s easier than loving me. Just don’t leave me empty. Bucky froze for half a second. Then he withdrew his fingers and slammed home in one merciless thrust. John screamed—raw, shattered, perfect.
Bucky gave no quarter. He fucked like retribution—deep, punishing strokes that punched the air from John’s lungs. The metal hand kept wrists locked; the flesh one bruised his hip.
“You think anyone else could handle this?” Bucky snarled, angling to hammer John’s prostate relentlessly. “Think Bob could make you cry like a bitch in heat?”
“No—” John choked, tears streaming freely. “Only you—Daddy—only ever you—”
“Good boy,” Bucky praised, voice rough with emotion even as his hips snapped harder. “Taking your punishment so perfectly. So pretty when you’re broken open on my cock.”
The blend of degradation and praise shredded John completely. He babbled—bratty defiance one breath, desperate pleading the next. “Harder—ruin me—make it hurt so fucking good—please—”
Bucky obliged, pounding without mercy. “Greedy little slut. My perfect slut. This hole was made for me—tight, hot, begging. No one else will ever satisfy you again.”
John keened, body trembling violently. “Want that—want to be yours—don’t know if I deserve—” The fear slipped out raw.
Bucky slowed just enough to lean down, biting John’s shoulder hard enough to draw blood. “You already are,” he growled against skin. “You’ve been mine for months, you idiot. You think I’d let anyone else keep what’s mine?” John whimpered, pushing back frantically. “Prove it—breed me—fill me—mark me inside out—”
Bucky’s rhythm turned feral. “Gonna fuck you raw every day from now on. Gonna plug you after so you feel me even when I’m gone. Gonna make sure you never doubt who you belong to again.”
“Yes—Daddy—please—” Bucky wrapped a rough hand around John’s leaking cock. “Come for me, brat. Show me you’re mine.”
John shattered—sobbing Bucky’s name, clenching hard as he came untouched until that fist stroked him through it. The spasm dragged Bucky over; he buried deep and flooded John, groaning like the release hurt.
They collapsed sideways onto the couch, Bucky still seated inside, arms locking around John’s shaking body possessively.
Long minutes passed—ragged breathing, soft kisses pressed to sweat-damp skin. Eventually Bucky pulled out slow. John whined at the emptiness, hole clenching futilely.
Bucky fetched a warm cloth and water. He cleaned John with gentle, reverent strokes—wiping tears, sweat, cum, soothing over fresh bruises with murmured apologies. John curled into his chest, face buried in Bucky’s neck. “You meant it? That I’m yours? For real?”
Bucky tilted his chin up, eyes fierce and steady. “Every damn word. You’re mine, John Walker. The bratty mouth, the insecure parts, the pieces that think they’re unlovable—all of it. I’m keeping you.”
John’s breath hitched, eyes wet again. “I’ve been yours forever. Just didn’t think you’d ever want to keep me.”
“I’m keeping you,” Bucky said, voice unbreakable. “No more testing me with stunts like Bob. You need punishment—you come to me. You need to feel owned—you come to me. You need love—you come to me.”
John nodded, small smile breaking through. “Yes, Daddy.” Bucky kissed him slow and deep—no battle, just promise.
They moved to the bed eventually, tangled under sheets that smelled like sex and them. John fell asleep with Bucky’s metal fingers tracing soothing patterns along his spine. Morning arrived too soon.
John limped into the communal kitchen wearing Bucky’s oversized hoodie and a smug, satisfied grin. Every step pulled at sore, ruined muscles and made him shiver with memory. Yelena glanced up from her coffee, eyebrow arched. “You walk like you lost fight with truck.”John poured a mug, wincing dramatically as he lowered himself—very carefully—onto a stool. “Worth every second.”
Bucky followed minutes later, hair damp, sweatpants low, arm sliding possessively around John’s waist. He pressed a deliberate kiss to the dark bite mark on John’s neck—visible for all to see. Alexei boomed a laugh that rattled mugs. “About time! No more sneaking around like teenagers!”
Ava smirked. Bob flushed but offered a sheepish nod. “We cool?” John grinned. “We’re cool. But next time you want to ‘spar,’ find another partner.” Bucky’s arm tightened. Message delivered.
The team took it in stride—teasing endless, but underneath was quiet acceptance. The tension that had been simmering for months finally eased. John Walker was thoroughly, irrevocably claimed. And Bucky Barnes wasn’t ever letting go.
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