IF YOU HAVEN'T WATCHED IT ALREADY, SHAME ON YOU. GO DO THAT. But for now I just have two fic recs. Warning: these things are likely to break your heart more than once for a prolonged period of time.
Mutually Assured Destruction - The one where Mark and Eduardo are serial killers. Perfectly terrifying.
All Our Errors On Repeat - Timeloop fic that should be cracky and insane and fun, but it is just not. This fic breaks me down right along with Mark. It's like a slow burn.