1) Somehow baby Tony is in Hydra's custody and the Winter Soldier is given charge of him, but a few times throughout the years Tony was taken away (by Stane?) then brought back until h eventually wasn't brought back. Meanwhile, the Soldier somehow remembers Tony when he sees him on TV (during the New York invasion, maybe) and breaks out of Hydra to find him by sneaking into Stark Tower only to be cufh by the Avengers who don't listen to Tony that the Soldier won't hurt them. Pretty sure it was a short series of fics.
2) Bucky can't sleep one night free moving into Stark Tower so he goes wandering and ends up on an empty floor where Tony has stored some boxes. While looking through a box Bucky finds old stuff from Tony's childhood and teen years, including an old Halloween costume teen Tony wore which was a pretty decent copy of Bucky's old Howling Commandos outfit. Tony catches him and they talk and Bucky learns Tony had a crush on him as a kid.
3) Similar deal in so far as Tony had/has a crush on Bucky but I think in this one Tony totally fanboys over Bucky and can't even talk to him without blushing or running, and Bucky thinks Tony hates him. Then Bucky somehow ends up in Tony's home office and finds its practically a shrine to Bucky Barnes because Tony is still a total fanboy.
Thanks for by help in advance.