I never had a solid Natasha ship, though I do ship Natasha/Clint and I liked Natasha/Sam after TWS, and I also ship her with a bunch of women (Pepper most of all) but I too have always liked the idea of MCU Bucky/Nat. They just have so much shared trauma and aesthetically they would make for a very attractive couple. It is a shame we didn't get any hint of it or the past they had in the comics. If they hadn't killed her off in Endgame, she could have made an appearance in TFATWS. I am a diehard Sam/Bucky shipper, ever since before CACW but I know it will never happen, so that would have been great.

Black Widow is apparently set after the Civil War movie, which makes it all the dumber that they waited this long to release it. It should have come out five years ago. :\