3.

Once his knot receded and his Omega welcomed the sweet embrace of unconsciousness, Sam slipped out of the nest. He retrieved a necessary item from his duffel bag.

A butt plug. All the better to secure his load inside his mate.

It went in easily. Bucky barely stirred. Once his Heat was over, Sam planned on ordering one of those specialty plugs with the fake wolf tail attached. Because what was life without a little whimsy?

The plug fit snuggly. Keeping his Omega nice and full with his cum. The first load of many. It hadn't just the Heat lust talking when Sam had said he wanted to put a baby in Bucky. He gingerly pressed his fingers to his own neck. His mating gland throbbed dully from where Bucky had sunk his teeth in. The pain was not wholly unpleasant. It reminded Sam that he and his Omega were joined. Before long, the bite would heal into a scar for all the world to see. And Sam would carry it for as long as his Omega lived.

Which had better be a long fucking time. The universe owed Sam at least that much.

With a clear head, Sam assessed the situation. He figured he had about thirty to forty minutes of down time before Bucky's Heat had him aching again. He spotted a mini fridge in the corner of the bedroom. Upon closer inspection, he found it already had a couple bottles of water chilling inside. Good planning by his Omega. Sam's chest puffed out with pride. Along with the water, he would add two bottles of Gatorade. The orange flavor that Bucky preferred. It was a good start.

Up next: a survey of the kitchen.

About a dozen cans of soup in the cupboard. A few different kinds. It looked like Bucky liked to keep his options open, though he seemed to lean more towards the chicken noodle variety. In the fridge Sam found some andouille sausage along with a few packages of pre-cut cheese. Sharp white cheddar and Colby. Those would go great with the crackers Sam had brought. A nice little snack for his Omega. Sam had also picked up some of those smokehouse almonds Bucky said he liked. He tried to keep a mental list of his mate's preferences. Fully in Heat, Bucky would be spending most of his time sleeping and fucking. It was the Alpha's duty to provide sustenance. Sam planned on keeping his Omega's belly, as well as his ass, full.

He grabbed a pack of cheese and placed it in the mini fridge. Within arm's reach of the nest Sam distributed a few shelf stable stacks for the two of them to munch on. Nuts. Crackers. Sam's favorite brand of protein bars. He put a bottle of water on the nightstand beside the bed as well as a book to help pass the time for when he wasn't busy fucking Bucky's brains out. Sam stood beside the nest. It had gotten a little bit rumpled due to their enthusiastic activity, but it was none the worse for wear. Plus, it was starting to smell like the both of them. This pleased the Alpha greatly.

In his absence, Bucky had curled up in the spot of the nest that Sam had left behind. His face pressed into the pillow that he had covered with one of Sam's shirts. An opportunity presented itself and Sam simply could not let it go to waste. His cell phone in hand, he snapped a few pictures of his gorgeous Omega. Naked in their nest. His ass plugged and sleeping so peacefully. How could Sam not want to preserve this moment? Though these photographs were for his eyes only.

He staked out a new spot back in the nest and tried making himself comfortable. The first thing he did was turn Fred the Octopus towards the wall. It was creepy having a stuffed animal eying him while he was balls deep in his mate's ass. Satisfied, Sam closed his eyes. He couldn't fall asleep but he enjoyed the brief respite before his Omega inevitably stirred, seeking him out. Sam let himself relax, surrounded by their combined scents.

Thirty-two minutes.

That was how long Bucky had managed to stay down before his internal ache flared back to life. This would be the cycle for the next four to five days. Sam suspected that, since it had been decades since Bucky had last gone through this, it might be rougher going than usual for his Omega. All that pent up energy practically bursting at the seams. Sam would have to rely on his Alpha stamina more than ever.

Drawn back into the waking world by his aching need, Bucky crawled on top of him. "You smell good."

His voice was roughened by blossoming desire. His heavy-lidded eyes were focused on Sam's face. As though the Alpha were the most fascinating thing Bucky had ever had the pleasure of gazing upon.

"So do you." Sam stroked a wayward lock of hair out of his face. He rubbed the scent glands in his wrist across Bucky's cheek. The Omega shuddered, falling even deeper into the Heat haze. He was incredibly vulnerable right now. While in Heat, an Omega could hardly think straight. They cared only about being mated. Such a state of mind rendered them utterly defenseless. The Omega could not protect itself from any sort of danger. Which was why they needed to have an Alpha around.

There were few things more vicious in the world than an Alpha protecting their mate.

"No, but…" Words were hard for Bucky. When it came to expressing any thought other than how badly he needed to be pounded, ridden hard and put back wet, the Omega stumbled over his own tongue. "You smell good all the time." Lowering his head, Bucky pressed his nose into Sam's neck. An inch below his ear was another scent gland. The Omega breathed him in deeply. "It's like… a bonfire? At the beach? Smoke and sea salt." He dragged his tongue across his Alpha's throat. "There's something in me right now. It's… hard. But good. I like it."

Sam reached down between Bucky's legs. "It's a butt plug." He gripped the base with his fingers and gently tugged. Not enough to dislodge the plug but just enough for the Omega to enjoy the pull. He then pressed the plug back in. Deeper than before. He wanted his mate to feel that, too.

Bucky made a gurgling, grunting noise, like his brain was melting. He pushed his face into Sam's neck. Mouthing at the mark he had made earlier. Keening softly while his Alpha toyed with his hole, Bucky rutted against Sam's stomach. Rubbing his erection against Sam's abdomen. He was aroused but not yet out of his mind with desperation. Content to be his Alpha's plaything. Sam stoked the fire burning beneath his Omega's skin.

"Tell me what you need, sweetheart." A gentle request from Sam. No Alpha voice needed.

Bucky sighed you in a way that made Sam's chest tighten and his dick twitch back to life. "Need to feel you everywhere… All over…. Inside me… So big it hurts." He stopped his worship of Sam's neck to look into the Alpha's eyes. "You don't like hurting me. Even when it's what I want." Here was a brief moment of lucidity. "I like the pain when you're the one giving it to me, Sam. I trust you."

Sam kissed him. Softly at first. Then with teeth. He nipped at Bucky's bottom lip. Just hard enough to make the Omega whine. He liked the sound. He liked the way Bucky gave himself over to him so completely. Sam was free to use the man as he saw fit. Right now Bucky's body belonged to him. Relinquishing control came easily only because he trusted Sam not to abuse the privilege.

He combed his fingers through Bucky's hair, then grabbed a fistful of it. He pulled the Omega's head back. The man was like a ragdoll in his hands. He gave Sam absolutely no resistance.

"You want me inside you, baby?"

"Yeah," rasped the blissed out Omega. His eyes like deep, dark pools.

Their combined musk hung in the humid air. If Sam were to open up a window, he was sure the whole block would have been able to smell them. As it stood, Bucky's neighbors were certainly getting an earful. The walls of the apartment were only so thick.

Sam twisted his grip just a touch to give Bucky a little taste of the pain he craved. "Then you're gonna have to get me hard."

An eager Omega was a joy to behold. Sam needed only to point his mate in the right direction for him to hop to it. He released his hold on Bucky's hair as the Omega scrambled down his body. It didn't take Bucky long to reacquaint himself with his Alpha's cock. He happily nuzzled Sam's half hard shaft and balls.

Sam reached for his phone. He thumbed open the camera. He had to get this on video. One more thing for the spank bank.

If there was one thing Bucky loved more than starting or winning an argument, it was a challenge. And, boy, did Sam have a big one for him.

He started by kissing Sam's dick all over. From the tip to the base and back up again. He rubbed the head of Sam's cock across his lips before darting his tongue out for a taste. The Omega moaned. He had such an industrious little tongue. He used it to lick all around. Filling his mouth with the taste of his Alpha. Bucky used both hands to work Sam's shaft. He used his own spit to keep the Alpha slick. His mouth was as hot and wet and tight as his asshole had been.

"That's it, baby. Just like that. You're so good. So fucking perfect." Sam heaped on the praise. It made his Omega feel good. Which, in turn, made Bucky suck him all the more. A win-win all around. "Go deeper… More… I know you can take it, Buck… I know you can... God, look at you… Look how good you are."

It had been far too long since Sam last had his dick sucked. To be fair, he had been plenty busy. Tracking down some AWOL assassin. Getting locked up, then getting busted out. Yeah, that had been fun. Then there was the whole Thanos thing. Got snapped, came back, now he was Cap. A dude didn't even have time to catch up on Game of Thrones. Though maybe it was just as well. He'd heard the ending was shit anyway.

All in all, getting laid was pretty far down on Sam's list of priorities. There was always a world that needed saving and a bad guy that needed stopping.

Granted, the reformed bad guy currently deep throating his dick more than made up for that dry spell.

Bucky sucked his dick like it was a competition and the Omega hated to lose. He was singularly focused on the Alpha's cock. Slurping and stroking and swallowing around his length. Every so often Bucky had to pull off and gulp air. He stared at Sam's cock in amazement. So thick and hard. And it was hard just for him.

The Alpha held him in place by his hair and fucked his mouth. Pressing deep enough to make his eyes water. Bucky looked up at Sam with damp eyelashes. He stared straight into the camera. Whimpering as Sam used his mouth the same way he would use his ass. The Omega was an instrument of pleasure. A pair of holes with a pulse. He would do anything to earn his Alpha's knot.

"That's enough." Sam pulled him off. His hand still fisted in Bucky's hair. He zoomed in on the Omega's face. Bucky was strung out on pheromones. He had succumbed fully to his Heat and now lived only to feel his Alpha spurt his cum inside him. Sam could come on Bucky's face if he wanted. Paint that pretty face with streaks of white. Watch his mate lick it all off and beg for more. He rubbed his dick across Bucky's lips and chin. "You did so good, baby. Got my dick all hard and wet. And it's all for you. Nobody else."

Sam wasn't the only one with a possessive streak. A mated Omega was known to fight tooth and nail for their Alpha. Taking out anyone that dared encroach upon their claim. Bucky could do a lot of damage should he feel that his place as Sam's mate was in jeopardy. As the Winter Soldier or the White Wolf, he was not one to mess with.

"Mine," croaked the Omega. He crawled up Sam's prone body. His eyes burning. He was hungry, greedy for his Alpha. He would have all of Sam or else there would be Hell to pay. He kissed Sam sloppily. There was no art. No grace. Only the insatiable appetite to take and be taken. "You're all I've ever wanted. Can't let you go now."

Where else would Sam rather be?

He pulled the plug out of Bucky's ass. The Omega shuddered at suddenly being so empty but Sam's hand on the back of his neck grounded him. His Alpha's touch reminded him of his purpose. To be so full of Sam that nothing else mattered. The building could catch fire and Bucky would keep right on fucking.

The Omega skipped over the tantalizing tease and went straight to sinking back onto Sam's thick cock. His moans filled the bedroom. His eyes screwed shut, his head thrown back, Bucky reveled in the stretch and burn. God, he was gorgeous. His skin glistened with sweat. His muscles taut as he took all of Sam in. The Alpha stroked his sides to help his mate relax. He thumbed at Bucky's nipples. A newly explored erogenous zone whose tender ministrations resulted in a fresh flood of slick gushing from his hole.

Praise kink. Pain kink. Nipple play. Sam had learned so much in such a short period of time.

Bucky circled his hips. Adjusting to Sam's size. His eyelids fluttered at the fullness. He rocked back and forth. Giving the dick inside him a few test strokes before he began riding in earnest. Sam simply laid back and watched. It was fucking beautiful the way Bucky took charge of his pleasure. He knew exactly what he needed and used Sam's dick to get it. He wasn't shy. And he wasn't quiet. Whimpering about how good Sam felt, how he never wanted it to stop, how he would do anything for his Alpha.

Staring straight into Sam's eyes, Bucky shamelessly took his Alpha's cock down to the root. It was good, so good, but not enough. He even tried furiously stroking his own dick, but it still wasn't getting him there. Bucky let out a whine in frustration. So desperate to get off. His ache intensified as his orgasm remained out of reach. Tantalizingly close. Sam could feel it. Their bond hummed like a live wire. He could feel how badly Bucky wanted to come. How badly he wanted to be a good Omega for Sam.

"You're so good, James, so perfect for me… Love you just the way you are, sweetheart." Sam meant every word. But it was not what his mate needed.

He caressed Bucky's cheek. "Do you trust me?"

"Yes," the Omega groaned. "Always."

They hadn't discussed this next part before. Hell, they hadn't really discussed anything before Sam showed up on Bucky's doorstep. But he knew what Bucky needed, even if the man couldn't ask for it himself.

The Alpha reached up and lightly wrapped a hand around Bucky's throat. He didn't squeeze. He didn't choke. Sam simply applied a little pressure to the sides of Bucky's neck. Just under his jaw. While it wasn't enough to jeopardize the Omega's air supply, there was definitely something about being held by the neck that had Bucky spasming around his cock. The Omega whined, his metal hand gripping Sam's wrist, holding him in place. Sam planted his feet on the mattress and fucked up into that tight, perfect hole. Deep, brutal, punishing thrusts.

Make it hurt. Make him take it.

That pushed Bucky over the edge. He clung to Sam, his eyes rolling back, his legs trembling. Spilling himself all over Sam's stomach. His hole clenched in search of the knot that wasn't there.

The Omega had barely recovered before Sam rolled over. He pulled out of Bucky's ass and flipped the man over.

"On your hands and knees. Now." The Alpha voice was back.

Sam took control. Waiting impatiently for the disoriented Omega to do as he was told. Bucky clumsily shuffled into position. Face down. Ass up. He presented his available hole to his Alpha. It was still twitching from his orgasm moments ago.

"Beautiful." He ran his hands down the valley of the Omega's back and down to those perfect ass cheeks. "Gonna breed you so good, Buck. Fill you up until it's dripping outta you. Gonna ruin you for anyone else." Because Bucky belonged to Sam. He belonged with Sam. And the Alpha would break bones to keep his mate.

He spread Bucky's legs a little further apart. His hands corrected the curve of the Omega's back. Once pleased with his partner's submission, Sam paused to take a few more pictures. The moment was too good to pass up. Just look at how ready Bucky was to receive him. Sam even got some shots of Bucky's face pressed against the pillows of the nest. He made sure to capture those flushed cheeks, his glazed over eyes, and the all around fucked clear out of his mind expression. All of Bucky's wonderful - and, at times, infuriating - complexities had been stripped away. Leaving only this vessel. Waiting to be filled.

Bucky could handle a little rough use.

The Alpha mounted his Omega. His strong hands holding Bucky in place, Sam fucked into him. Long, languid strokes. He watched his dick into that phenomenal hole. His mate moaning as he took all Sam had to give. It was a perfect fit.

"Like you were made for me."

He didn't believe in fate but, this… There had to be some divine plan involved to make this happen.

"Harder… please…" Bucky pushed himself back to meet Sam's thrusts. He was panting, begging for more. "Fuck me harder… Your dick feels so good, Sam… Please, don't stop."

Why would Sam ever stop? Why would he ever want any of this to end? For these next few hours, the world outside the windows meant nothing. The meaning of Sam's life was right here in this nest. And he didn't mean Fred the Octopus.

He draped himself across Bucky's back like a weighted blanket. Pining his dear, sweet Omega to the mattress. Sam delivered deep, soul stirring strokes. His hips came down hard, ripping jagged moans from Bucky's throat. It pleased him greatly to watch his mate clutch at the pillows. His mouth dropping open as Sam swiveled his hips and stirred the cock buried all the way inside him. His Omega made the most lovely noises. Helpless little groans that were punched out of him. He tried muffling the sounds but Sam wasn't having it. The Alpha wanted to hear it all.

"Mine," Sam growled into his ear. His thrusts quickened. Pounding. He set a brutal pace. Both the bed and Bucky shook beneath him. Though their bond had already formed and showed no signs of weakening, the Alpha couldn't resist the urge to bite. This wasn't about mating. He wanted to mark Bucky as his while gifting his Omega the sweet agony he craved. And though the bruises and bites might eventually fade, Bucky would never forget the perfect bliss brought by Sam's teeth breaking his skin.

Bucky took his knot, clenching and coming hard again, this time spilling into the sheets. He gasped and quivered as his Alpha unloaded inside him. Sam's orgasm seemed endless. As soon as he finished spurting, he got to thrusting and grinding again. His swollen knot rubbing and pulling at his Omega's hole. Bucky whined as the head of Sam's cock kept nailing his prostate. Forcing him to come for a third time. This, of course, triggered another load from Sam. The Alpha grunted in satisfaction, lazily laving at the fresh bite he had made while he continued to empty his balls.

This was how an Omega got bred. One load after another.

"Sam, please… It's too much… I can't."

"Just a little bit longer." He placed reverential kisses on the back of his mate's neck. "You're doing so good. Such a good Omega. Taking it all." Sam interlaced their fingers and slid their hands down to Bucky's stomach. "We're gonna make some pretty babies."

Bucky made that brain melting sound again.

It took another twenty minutes before Sam could safely disengage. He swiftly plugged Bucky's hole back up with the butt plug. The Omega put up minimal protest.

Curling up against Sam's side, Bucky let out a disgruntled huff. "It makes me so sleepy after. I hate it." His nose scrunch was too adorable for words. He was like a toddler fighting naptime. He frowned into Sam's shoulder. "I've slept so much already. I missed everything."

His mate sounded so forlorn. Sam kissed Bucky's forehead. A gentle, loving gesture. "You didn't miss everything. And I promise that you aren't about to miss anything now. So please, for once in your life, stop being so mule-stubborn and get some rest? For me?"

Bucky's indignant stare lost some of its sting now that Sam knew what the Omega sounded like begging for his knot. "You are a terrible person."

"High praise coming from the man that Spartan kicked me off a helicarrier." Sam settled back against the pillows and closed his eyes.

"Again, that was one time!"