Just as Steve thought that Rumlow was right and that he had failed, Bucky swung his right fist into the back of Rumlow's head and, in the same motion, snapped the chains holding Steve up with his left. The cell exploded into chaos, as men with their pants almost literally around their ankles were mowed down by a pair of naked and furious supersoldiers. They managed to strip Rumlow and another one of the STRIKE members of their clothes and collected as many weapons as they could carry, then Bucky punched through the locking mechanism of the cell's door, and they were out, plotting through the guards outside and drooling every hydra agent in their way with deadly efficiency. Bucky's fighting style had changed, but Steve could still somewhat anticipate his actions, and the pair of them worked together like a not particularly well oiled but still mostly operational machine. Alarms only started ringing after they had broken out of the facility's and emerged outside the parking lot of a building with the logo of a bank emblazoned on all of the doors. They stared at each other for a moment, and Steve was sure that Bucky was about to bolt, or strike Steve down, or break down into pieces, but Maria Hill chose that exact moment to appear with Sam and Natasha in a nondescript grey Toyota. Sam sat in the passenger seat and Natasha sat behind Hill, and they both had guns out while Hill had one had on the steering wheel and one hand by her shoulder holster.
"Don't shoot!" Steve whispered urgently. "Bucky helped me escape."
Bucky tensed, but did not otherwise move. After a moment, Steve opened the car door and climbed inside.
"I don't know who this Bucky is." Bucky said, but docilely climbed into the backseat after Steve. "I just know that Brooklyn is a passcode for an order to cease current actions and provide assistance."
"It was our safeword." Steve said, mindful of the attention the other three were paying them. "I suppose that was what it meant, but it wasn't a pass code or an order, not really."
Bucky looked terribly confused. "But, that was a passcode. You programmed it into me. It might be old programming but I still remember you programming me with it. Brooklyn is a trigger code to stop what I am doing and help Steve. You are Steve, that is your code name, yes? You have the authority to use the code, so you must be my handler Steve. That is the only person with authority to use that trigger phrase."
Steve's face pinched into am unhappy expression. "I'm Steve, but that's not a code name. My name is Steve Grant Rogers, and your name is James Buchanan Barnes. I am your friend, not your handler."
Bucky's expression was even more bewildered. "Friend? Wh- that's not correct. The Asset responds only to the orders of authorised handlers. The Asset only interacts with authorised members of HYDRA. The Asset does not accept orders from those without correct authorisation."
Steve tried not to frown. "It's okay if you don't remember being my friend, Bucky." He said. "I - even if you don't remember me, I'm still with you til the end of the line."
There was a moment of silence as Bucky's eyes went wild and unfocused, and he froze in his seat. After a second, he looked at Steve again, with wide disbelieving eyes. "S-Steve?" He said, uncertainly.
Steve could feel his smile threatening to split his face. "Yeah Buck, it's me."
"I- I thought you were...smaller." Bucky said with a frown, trying to chase the memory of the bony blond man he could have sworn was the same person as the man beside him.
"I thought you were dead." Steve replied thickly, and Bucky's eyes widened again with the onslaught of yet another memory.
"You-you joined the army." Bucky said, testing out the idea.
"Yeah Buck, I did." Steve confirmed, and slumped down in relief. Beside him, Bucky didn't look anymore relaxed, but the furrow between his eyebrows eased and his eyes were no longer wild and terrified, they way they had been when Steve first saw him on the bridge or when the tech had lead him into Steve's holding cell.
Natasha and Sam did not put their weapons away, but they lowered them minutely, and Hill returned her hand to the gearstick and started to drive.
"There's someone you need to see." Hill said.
Steve looked questioningly at Natasha, who was sitting beside him. "Don't look at me." Natasha said."I haven't seen anyone but these two and a couple of hobos sleeping by the bank's doors since we separated."
"Your friend Hill here was disguised as one of the soldiers guarding us in the van." Sam said. "We got out, but we've been tailing you since then. It took a while to get this close to the building without being detected. We were hoping to break you out before they finished monologuing and fed you to the sharks."
"Not monologuing" Bucky interjected, "no sharks." his eyes went unfocused as he reported tonelessly: "Director Alexander Pierce issued orders for Captain Steven Rogers, code name Captain America, Level Six target, to be transferred to STRIKE Team Alpha leader Level Eight Agent Brock Rumlow and sixteen HYDRA agents above clearance Level Seven of his choosing to break in Rogers' tight little fuck hole and teach him how to take cock and then transferred to Asset Maintenance teams Alpha through Gamma to be wiped and reprogrammed into a HYDRA Asset. Hail Hydra." A pause, then, "Director Pierce has given orders for the Asset to assist Agent Rumlow in any capacity required for the interrogation of Captain Rogers. Authorise switch to Protocol Beta, passcode Satin. You are to wear your pretty pink ribbon around your pretty pink dick and be a good little cock slut for Agent Rumlow and his men. Hail Hydra."
No one spoke after Bucky finished reciting the orders. The car was terribly silent. Bucky looked nervous, as if he knew that he had said something upsetting, somehow, but he wasn't sure what it was and how he would be punished. Steve squeezed his eyes shut. He suddenly remembered that in the rush of the escape, Bucky hadn't gotten a chance to remove the ribbon tied around his cock. Steve also suddenly felt the tug of his one remaining nipple clamp, also neglected in the flurry of action. Steve took a deep breath, trying to pretend that the screaming ache of his asshole wasn't coming back to him as his adrenaline levels dropped.
"How bout we talk about it later." Steve suggested. Sam, Natasha and Hill exchanged meaningful glances, but they showed their silent agreement by turning the topic of conversation to updates of the information Hill had shared with them in Steve's absence and rummaging around Hill's first aid kit for bandages when Natasha's shoulder wound bled through both its dressing and her shirt.
HYDRA still needed to be stopped. The whole world was at stake. They would worry about it later. There was no other choice.

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I can't believe it took me this long to write 9K words but here it is finally. I hope I did the amazing prompt justice. I'll probably tidy it up and put it on AO3 as soon as I get a chance to proof read it. Thanks for reading! :))))
(Also I can't believe I ended this so happily. I'm trash but I'm also trashier than trash because I'm a sucker for a happyish ending.)