Sentinel/Guide AU for starkingenuity

[starspangledspandex]

Things have been going remarkably well between them. Even if the beginning was somewhat rocky, their compatibility was obvious and not just to them. Steve was old-fashioned and though his instincts made it clear what they wanted, he did things the "right" way. There were dates and gifts and just general wooing. They talked about it and they were ready.

He smiled at Tony, watching him as he worked and couldn't stand it anymore. "Tonight," he said, then added, for clarity, "We should bond tonight."

Maybe not the most romantic proposal but he figured he shouldn't smother Tony in it anyway or the man would get sick of it. No the rarity made it special.

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[whothehellisbucky]

"It feels weird giving orders to Captain America," Bucky said, maybe a little too loudly, but they weren't using heat sensors against them and a group of soldiers ran passed.

It felt like being back in Europe. The buildings in the warehouse district could just as well be forests.

Bucky set his chin on Steve's shoulder as they crouched. It was just a little thing.

[starspangledspandex]

"We're a team," he responded quietly, watching as feet ran past them and not a single person thought to check under anything. "It's not giving orders. It's working together."

Steve smiled at the man, glancing at him as he adjusted his shield and then frowned, "If Tony is paying attention, he's going to be panicking."

[whothehellisbucky]

"Who's that?"

Bucky was curious. His memory was hardly back in place and what happened during the Winter Soldier program would probably never be gained. He didn't know that he had killed Howard. He didn't know how many people fell because of him.

And he certainly didn't know that his childhood friend had found someone to bond with because... Well he always thought Steve was normal and being a Super Sentinel later in life allowed him not to have to bond at all.

In fact he was pretty sure that the physical queues he was getting from the other was just emotion and his body having a literal loose wire.

[starspangledspandex]

This was not where he wanted to be having this conversation. It was a terrible time for this, particularly with Bucky barely back on his feet, but he wasn't going to hide from him.

"Tony Stark," Steve said, taking a deep breath. "My Guide, well, almost. I'm having trouble with the bond on my end but it exists on his. We have a team of scientists on it."

[whothehellisbucky]

Stark wasn't a name easy to forget. "Stark--" wait. "Howard's kid?" If he knew the truth he wouldn't be laughing, and in fact he wasn't laughing a few moments later when the rest of that caught up with him. "I figured he had kids. Too many. That man did like to get out of camp whenever possible."

But they were no longer living in the forties. There were cell phones, the strangest looking cars, weapons he could barely describe...

And Howard Stark's Guide son being with Steve.

And that brought up memories of couch cushion beds and yelling matches because didn't Steve know what was going to happen if they got caught? And they were absolutely going to get caught. Besides, they should have families. And Bucky would need a Guide. Their kids could be friends--

But that didn't happen. And now the kid from Brooklyn who he had pushed away because being gay was a death sentence even for Guides and Sentinels when they were kids, had a Guide. And that Guide was a man.

Bucky pressed his lips together.

"Doesn't matter. Let's get out of here. To the left."

[starspangledspandex]

"Yeah, Howard's son," Steve agreed because what else could he do? A name like Stark was pretty distinct. "He's in his forties. As far as I know, he's an only child."

He remembered those days too but it didn't work did it? They weren't compatible enough right? Of course, it wasn't like he manifested as a Guide either. Steve remembered the arguments. Hiding that sort of thing from whoever you bond was impossible. How could you do that to someone? It didn't sit right with him.

They would have time to talk later. Right now, they needed to get out of here. Bucky was right about that at least. Steve went, trying to keep quiet and they surprised a guard or two on the way out.

[whothehellisbucky]

The quinjet, however, was overrun. Jarvis had not alerted Steve because speaking could likely alert people to their position. The cloak had been breached easily--

Too easily.

Bucky had his metal hand pressed back on Steve's chest, holding him back as he ducked his darker head over the edge of a railing. There was no sign of Sam either.

They had to move on. Bucky had been staying here for a week now... He knew a way out. Theoretically.

That didn't make it any better, what he was feeling inside. There was a lot of jealousy working up in his gut.

[starspangledspandex]

"Jet's a no go," he muttered, without even looking over the railing and he turned to survey the area. Surely there was a way out of here? They could both move fast. He was concerned about Sam but he was still confident the man would get out of here.

"You know a better way out?"

[whothehellisbucky]

"Follow me."

They couldn't just move fast, they could move smart. They could scale buildings. It didn't quite feel like old times--

It felt better.

By the time they made it out of the rail yards and into a warehouse a mile awhile, Bucky was grinning again and breathing hard.

"I shouldn't be having fun but I'll admit that I kind of am. Thanks for saving me again."

[starspangledspandex]

He did, because they didn't have a choice, but also just because it felt right. Why wouldn't he follow Bucky? Steve kept up without any trouble though he was also breathing hard when they got to the warehouse.

Steve laughed, "Well at least someone is."

[whothehellisbucky]

"It's not even a little fun for you to climb three stories up a brick building without rope," Bucky questioned, head back and eyes brighter than they had been for a long time. "You like being a hero. It's all you've wanted for as long as I've known you."

[starspangledspandex]

"It's a little fun. I'm just not a fan of being shot at while I do it," he pointed out, because the last time he climbed something, he ended up in the hospital for awhile. That might have been Bucky's fault.

"I just wanted to make a difference," he said, smiling warmly at the man's expression. "I think I've done okay."

[whothehellisbucky]

Steve Rogers. Still the most noble guy he knew. Bucky hand to press metal fingers over his lips so that he didn't laugh too loudly. They were still in range to be found, and laying low for the rest of the night was their best bet.

The problem was that being near Steve for longer periods of time was really starting to effect Bucky. Now that he was nearly the Super Sentinel that Steve was, he was starting to feel ways he hadn't before. It was the Guide part of him that had been fused to his very Sentinel cells to create the perfect hybrid compliment to Steve's Sentinel induced Guide-ness.

Silence drifted. "I can smell you," Bucky said unabashedly. Steve's added Sentinel called out to Bucky's added Guide. And the reverse was true too. He'd been barely Sentinel before the war and that's why he was drafted. Steve had been barely Guide.

"I think that might be why I couldn't kill you when I was mindless..."

[starspangledspandex]

He was silent for a few moments after that admission. Steve could smell him too and it was a strange feeling. It was similar to Tony. It was the same draw that he felt toward the older man. He didn't have any doubt that they were compatible. Were the numbers as good as him and Tony? He doubted it. Those numbers were off the charts. However, that didn't mean it wasn't still high and that didn't surprise him either.

"Might be," he agreed and in another lifetime he might have acted on it. Things were different now. Now there was Tony and Steve was already committed to him.

[whothehellisbucky]

But Tony wasn't here. All Bucky had was memory of the time when he and Steve tried to do something that no one back then would have understood or condoned. His mind was still fogged up and he had weird puzzle pieces of Guide and Sentinel warring inside of him wanting what he had always wanted.

If he was capable of thinking clearly, nothing would have happened. It was just easier to let the way Steve smelled charm him and flip the triggers Hydra always knew it would eventually.

He leaned over, nose touching Steve's jawline and then his earlobe.

[starspangledspandex]

He took a deep breath, trying to settle himself and keep his own mind clear. Steve was, after all, still a slave to instinct when it came down to it. He knew if he didn't nip this in the bud it was going to be a problem.

"I can't do this, Buck," he murmured, raising his hands to the man's shoulder and gently tried to push him away.

[whothehellisbucky]

"Yeah I know. Stark's kid," Bucky mumbled against the blond's smooth neck. Did he ever have to shave? His skin was so perfect. Still. That was what stuck out the most for him. There was a lot more muscle now, but Steve still felt the same over all. His tongue lapped at the spot between his ear and his neck.

Bucky let himself be pushed away, but his pupils were blown open and the pheromone release was unmistakable.

[starspangledspandex]

Lapping at his neck was not helping Steve's resolve here. It made him growl quietly, unable to help himself and he smelled the rush of pheromones as clear as anything. His body recognized it for what it was just like it had with Tony and yet, last time it was left wanting.

His body wanted what it was supposed to have already. It craved the failed completion. It really didn't care what his mind wanted either. It just felt the compatibility. His instincts couldn't understand that Tony would be better.

"I'm sorry," he added with a swallow, eyes steady as he focused on Bucky.

[whothehellisbucky]

"I understand. I've been dead," Bucky pointed out and though he sounded okay, that didn't stop him from trying to lean back in and get Steve to toss his head back.

He was reading as both Guide and Sentinel and it was confusing and wonderful and delicious for Bucky. He might say one thing but his body wanted another.

"I was dead. And then you brought me back..."

[starspangledspandex]

The other man could hardly blame him for moving right? It certainly sounded like he understood but Steve still felt a little bad about it anyway. He really wasn't trying to think about it.

Steve was as confused as Bucky about which instincts to follow. Most of him wanted to bite Bucky but there were parts that wanted to let him do the dirty work. His Guide instincts shouldn't be that prevalent with all the treatments he did so far.

"Yeah," he agrees, rather intelligently, and he couldn't make himself form any other words. This wasn't good.

[whothehellisbucky]

As if that wasn't bad enough with the mixed singles going on around here, Bucky climbed up into Steve's lap like it was natural to do so. He let his real fingers card through soft blond hair, hips undulating and head falling back. He pulled Steve's lips towards his throat.

Why bother to speak? He wanted this. His body wasn't wrong. This was natural.

[starspangledspandex]

Yeah, that wasn't helping Steve at all. He swallowed again, hands moving to settle on Bucky's hips and it was with the intent to keep them from moving but he couldn't bring himself to do it.

"Buck," he whispered, voice a little desperate, because he wanted Tony and he couldn't bond anyway.

Instinct still won and Steve snarled, unable to help himself. He was being offered a highly compatible Guide. What else could he do? He bit down, hard, everything but then suddenly out of his head.

[whothehellisbucky]

It was awkward, but a little flexibility courtesy of the Russians and endless hours of training helped Bucky to lean around and bite Steve as well. The rush of combined hormones triggered heat in them both almost instantly. Bucky shoved his hand through the wall at once point and tried to use their discarded clothing to sort of make a nest with Steve's equally useless help. It was a little hard to tell what was going on because Sentinels were notoriously savage and that overplayed the parts of each of them that were Guides.

If blood was spilled, no one noticed. Bucky could feel himself becoming Steve... And he felt Steve inside of him too. The sensation was a little frightening. He knew all about bonding. Every school kid learned the basics in school. The Guide made the bond and the Sentinel sunk that bond within him or herself. That was natural. But this felt double ended, two bonds passing parallel to one another.

Bucky didn't know who won the struggle in the end for dominance but it didn't matter. Even if Steve was inside of him, he could feel himself do the trusting. And if he had bested Steve, it hardly mattered because he felt himself filled with thick, burning bliss.

It might not be pretty or natural but it was still perfect to Bucky Barnes. He'd lost everything-- And now he'd found his mate. And he'd been there all along.

[starspangledspandex]

The rush of hormones made this almost mindless between them. It was all pure instinct and Steve gave as good as he got as they rolled around. He didn't really know who went where either. It didn't matter. They were one.

The feel of the bond was a shock but also a relief to his strained and wanting instincts. The failed bonding had more of an effect on him than even he had realized. It made him susceptible to giving in far too easily to this bond when he was pushed,

When the hormones settled and his mind cleared, he was only briefly content. Then everything came crashing down around him. It was Bucky wrapped around him and not Tony. Tony who he loved and cared about and who would absolutely be ruined.

Honestly, he wasn't doing too much better at the moment.

Steve made a strangled, horrified sound. Devestation and heartbreak rushing through him. "No," he whispered, like that would make it go away. It might be perfect for Bucky but it wasn't for Steve. He loved Bucky but he didn't want to bond him. His compatibility with Tony was perfect. He spent the last two years loving Tony.

"No," he said again, shoving out of their shoddy makeshift nest.

[whothehellisbucky]

Bucky was exhausted and things actually hurt in a pleasant way that he had forgotten was even possible. It had not been his intention to do this, but now that he had, it was like his whole awful, half forgotten life had led right up to this moment. He smiled into Steve's hair, cradling him to his chest like he use to do when Steve didn't try to hide his tears as a boy--

And then it all came crashing down. Steve's horror washed over him, physically causing him to recoil. That was the bit of Sentinel in him reacting to the Guide. His immediate attempt to reach out and calm Steve with a touch was the Guide reacting to the distressed Sentinel.

Bucky felt everything crash an he drew away the moment he tried to reach out. He knew what he had done. Steve said no. Instinct said yes.

For the first time in years, Bucky felt tears sting his eyes. "I-- I'm sorry, I just--"