"White and Black Wolfs"

The common area of the Avengers’ floor in Stark Tower was usually a chaotic symphony of clashing egos, scientific jargon, and the occasional explosion from the lab. But at three in the morning, it was a tomb. The city lights of Manhattan bled through the floor-to-ceiling windows, casting long, geometric shadows across the expensive furniture.

Caleb moved through the darkness with the silent grace of a predator. His bare feet made no sound on the polished hardwood. Even in his human form, the werewolf’s senses were dialed to an eleven. He could hear the hum of the building’s cooling system, the distant siren of a police cruiser ten blocks away, and the steady, rhythmic thumping of his own heart.

He was restless. The moon wasn't full, but it was close enough to make his skin feel two sizes too small. His long, black hair was a tangled mess down his back, and his dark skin shimmered with a thin sheen of sweat. Sleep was a luxury his biology wasn't currently allowing.

He reached the kitchen, his yellow eyes cutting through the gloom. He didn't bother turning on the lights; he didn't need them. He just wanted a glass of water—maybe something to distract the beast pacing behind his ribs.

He reached for a glass, but a scent hit him. It was cold steel, gunpowder, and a hint of expensive shaving cream that smelled like sandalwood.

"You're up late," a voice rasped from the shadows of the breakfast bar.

Caleb didn't jump—werewolves didn't startle—but his muscles coiled with instant tension. He turned his head slowly.

Bucky Barnes was leaning against the marble countertop. Like Caleb, he was shirtless, wearing only a pair of loose grey lounge pants that hung low on his hips. The moonlight caught the intricate plating of his vibranium arm, making the silver metal glow with an ethereal, dangerous light. The scars on his human shoulder were stark, a map of a century spent in hell.

"Couldn't sleep," Caleb replied, his voice a low rumble. He forced himself to turn back to the sink, filling his glass. "The tower is too quiet. It’s unnatural."

"Tell me about it," Bucky said. He moved then, stepping into Caleb’s personal space. He didn't stop until he was standing just a foot away, leaning his hip against the counter. "Usually, I can hear Steve snoring through three walls. Tonight, it’s just the hum of the fridge and my own head."

Caleb took a long drink of water, acutely aware of the heat radiating off the soldier. He could feel Bucky’s eyes on him—not the cold, calculating gaze of the Winter Soldier, but something more intense. Something more human.

Since Caleb had joined the team, he and Bucky had existed in a state of mutual avoidance. They were both relics in their own way—men turned into weapons, struggling to find where the soldier ended and the person began. Their interactions had been limited to brief nods in the hallway and tense, silent staredowns during mission briefings.

"You're staring, Barnes," Caleb said, setting the glass down with a soft *clack*.

Bucky tilted his head, a ghost of a smirk playing on his lips. It was a glimpse of the Brooklyn charmer from the 1940s, a side of him that was slowly resurfacing through the trauma. "Hard not to. You’ve got a lot of energy coming off you. It’s like standing next to a live wire."

Caleb turned to face him fully, crossing his arms over his broad chest. His yellow eyes glowed in the dark, reflecting the moonlight. "It’s the moon. It makes me irritable."

"Irritable?" Bucky took a step closer, closing the gap. He was slightly shorter than Caleb, but he carried a weight of presence that leveled the field. "Is that what we're calling it? Because you’ve been looking at me like you want to bite me for three weeks."

Caleb’s heart skipped a beat, a traitorous thud in the silence. "Maybe I just don't like people sneaking up on me."

"I didn't sneak. You heard me coming a mile away," Bucky countered. He reached out, his metal hand hovering just inches from Caleb’s arm. He didn't touch him, but Caleb could feel the cool temperature of the vibranium. "You’re tense, Caleb. More than usual."

"I’m fine," Caleb snapped, his temper flickering. His claws elongated just a fraction, scraping against his own palms.

Bucky didn't flinch. He’d stared down gods and monsters; a werewolf with a bad attitude wasn't going to send him running. If anything, the flash of Caleb’s anger seemed to intrigue him.

"You know, back in the day, I knew a guy who couldn't keep his cool," Bucky said softly, his voice dropping into a conspiratorial register. "Always looking for a fight to drown out whatever was rattling around in his brain. Usually, he just needed a distraction."

Caleb let out a huff of dry laughter. "And let me guess? You were the distraction?"

Bucky grinned, and this time it reached his eyes. "I was a very popular guy in 1943. I had a certain charm that was hard to resist."

"I’ve seen the history books, Sergeant. You were a flirt," Caleb said, his own sarcasm rising to meet Bucky’s.

"I prefer the term 'socially gifted,'" Bucky corrected. He moved even closer, his human hand coming up to rest on the counter behind Caleb, effectively pinning him between his body and the sink. "But things are different now. I’m a little rustier. A little more... serious."

Caleb’s breath hitched. The scent of Bucky was overwhelming now—warm skin and cold metal. He could see the faint stubble on Bucky’s jaw and the way his blue eyes searched Caleb’s face, looking for a crack in the wolf’s armor.

"What are you doing, Barnes?" Caleb whispered.

"Trying to figure you out," Bucky admitted. "The others... they see a powerhouse. A wolf. But I see someone who’s just as tired of the noise as I am."

Caleb felt a surge of something that wasn't anger. It was a sharp, painful spark of attraction he’d been trying to bury since his first day at the facility. He hated how vulnerable the soldier made him feel with just a few words.

"You don't know anything about me," Caleb growled, though the threat lacked its usual bite.

"I know you’re holding your breath," Bucky murmured. He shifted his weight, his bare chest brushing against Caleb’s. The contact was electric. Caleb’s skin burned where they touched. "I know your heart is racing. And I know you haven't looked away once."

Caleb’s temper flared again, but this time it was fueled by a different kind of heat. He reached out, his hand gripping Bucky’s human shoulder. His grip was firm, his fingers digging into the muscle.

"You’re playing with fire," Caleb warned.

Bucky’s expression softened, the sarcasm fading into something raw and honest. "I’ve been burned before, Caleb. I’m not afraid of the heat."

Bucky reached up with his vibranium hand, his fingers surprisingly gentle as they brushed a stray lock of black hair away from Caleb’s face. The cold metal against Caleb’s heated skin made him shiver.

"You’re so loud," Bucky whispered, his gaze dropping to Caleb’s lips. "Your head, your heart... everything about you is screaming."

"Then tell it to shut up," Caleb challenged.

Bucky didn't hesitate. He leaned in, closing the final inch between them.

The kiss wasn't gentle. It was a collision—a desperate, hungry meeting of two people who had spent too long living in the cold. Caleb groaned into Bucky’s mouth, his hands moving from Bucky’s shoulders to his hair, pulling him closer. Bucky’s metal arm wrapped around Caleb’s waist, pulling him flush against his body, the strength of the vibranium unyielding.

It was a clash of silver and steel. Caleb tasted like salt and wildness; Bucky tasted like longing and a century of repressed sighs.

Caleb backed Bucky up against the kitchen island, his movements frantic and uncoordinated. The werewolf in him wanted to claim, to mark, to dominate, but the man in him just wanted to be held. Bucky seemed to understand the duality, his movements steady and grounding even as his own breathing turned into ragged gasps.

Bucky pulled back just enough to press his forehead against Caleb’s. Both of them were heaving, the air in the kitchen suddenly too thick to breathe.

"Still irritable?" Bucky panted, a smirk tugging at the corner of his mouth despite the intensity of the moment.

Caleb let out a low, vibrating growl, but there was no malice in it. He leaned down, nipping at Bucky’s neck, right at the pulse point. He felt Bucky shudder beneath him.

"You're an idiot," Caleb muttered against his skin.

"Yeah," Bucky breathed, his human hand coming up to cup the back of Caleb’s head, holding him there. "But I’m an idiot who’s finally getting some sleep tonight."

Caleb pulled back, looking into Bucky’s eyes. The yellow and the blue met in the moonlight, two different kinds of broken finding a momentary mend. The tension that had been building for weeks hadn't disappeared; it had simply shifted into something more manageable, something shared.

"Don't think this means I'm going to be nice to you in training tomorrow," Caleb said, his voice regaining its sarcastic edge.

Bucky laughed, a genuine, throat-clearing sound that seemed to chase away the lingering shadows of the Winter Soldier. "I wouldn't have it any other way, Wolfie. I like it when you’re a little mean."

Caleb rolled his eyes, but he didn't pull away. He stayed within the circle of Bucky’s arms, the silence of the tower no longer feeling like a tomb, but a sanctuary.

"Go to bed, Barnes," Caleb said, though he made no move to leave.

"In a minute," Bucky replied, his thumb tracing the line of Caleb’s jaw. "The moon’s still up. And I think I’d rather stay right here."

Caleb sighed, the beast inside him finally settling into a quiet hum. For the first time since arriving at the tower, the restless itch under his skin was gone. He leaned back in, seeking Bucky’s mouth again, deciding that if he had to be awake at three in the morning, this was a much better way to spend the time than pacing the floor.

The silver of the moon and the steel of the soldier were a strange match for a wolf, but as Bucky pulled him closer, Caleb realized he didn't mind the bite of the cold metal at all. It felt like coming home.