Found: Bucky's arm is designed to hurt him

[iamshadow.livejournal.com]

Hi, I am searching for a specific story where Bucky's arm causes him pain. Not because it's broken, or his body is damaged or because his flesh arm is growing back, but because Hydra specifically designed it to make it painful, so that the Winter Soldier would be motivated to return after missions for pain relief, as a form of chemical control/aversive conditioning. Tony is working on the arm and turns off the pain-causing circuit, and Bucky either falls asleep/passes out or just goes limp all over with the relief.

I think this is post-Winter Soldier, but it may be older. I have read so many Bucky stories since CA:TWS that they've all blurred together, and my searches for this scene have come up blank.

Thank you in advance.

Wings by Astolat