A tiny heater in Bucky's arm
I've got a little sliver of a fic stuck in my head and I can't for my life figure out what it's from: Bucky's metal arm is always cold, and it's uncomfortable for him, so someone (presumably Tony?) makes a little sticky strip heater thing that gets attached on the inside of the arm and keeps the whole thing at body temperature. I don't remember if that even has anything to do with the rest of the story... Any insight? Thanks in advance!