Captain America, Bucky Barnes and one of the most dangerous men on earth take a break from the world and learn that talking about their feelings isn't really that bad.
This is tagged Sam/Bucky, but is actually more like Sam/Bucky/Zemo or Sam/Bucky + Bucky/Zemo ... but in a really unusual way. So basically, you don't encounter true relationship ambiguity in fanfic very often. Not in the sense that the story is intentionally coy about what's going on, but rather, it's that most fanfic hits very traditional romance beats, and this doesn't. Instead it exists in the slippery, awkward relationship zone where even the people involved can't quite nail down what's happening here. It's not exactly platonic, not exactly romantic, and not exactly smarm. But there clearly is something going on - something tender and fraught and slow-burn, for all three legs of the triad, but in very different ways. The writing is awkward in places, but the story makes up for it (for me).
It's sweet and unusual and painful and weird, and perhaps one of my favorite things that I've read in the fandom so far. This entry is also posted at https://sholio.dreamwidth.org/1409622.html with comments.