I think it was Steve/Tony, from Steve's POV (or at least he was the central character). Warning for character death (Tony), and maybe something in the summary about Steve treking across a great distance (a desert?) or something to get revenge on whatever killed Tony? The final tag on AO3 was definitely something along the lines of "Character death but not really." I think it's been searched for on here before, but I can't find it here either. There may have been fanart associated with it.
I know this is a long shot, but any of this sound familiar?