Bucky eats hamburgers with a fork
Looking for a fic where Bucky couldn't eat any kind of hand held food, because the oils and particals of the food would get into the lines of his metal arm and cause problems and pain. So he had to eat things like burgers and pizza with a fork. I think after facing some teasing from the team, he stopped eating on days were they had things that had to be picked up.
Tony figured out what was going on and made Bucky something that allowed him to touch things that he normally wouldn't, (He made Bucky stick his arm into slime to prove it, I think) and he made it so Bucky would be able to feel with that arm. It might have been frostiron, but I'm not sure.