Tony/Bucky, Tony calls Bucky 'Blue'

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Have not much to go on except for the fact that Bucky at some point comes to live with Tony and has no memories. Tony does not know who he is and calls him Blue.
At some point Bucky regains memories and shouts at Tony when he calls him Blue. Rants about how he could not find out who he was. Tony and Jarvis had been looking and going back 10y at a time and not got back as far as the 40s yet.

Hope this rings a bell with somebody. Getting back into the fandom and wanting to read some faves xx