Fandom: Avengers - movieverse and comics. If you haven't read the comics, don't worry; the author writes wonderful context and the main characters are all people you know.
Warnings: Violence, language. No sexitimes, sorry. Developing relationship, angst, romance, minor character death, faked deaths... I think that's everything.
Length: 9 hours, something like 15 minutes and change. 9.3 hours, because that's totally a useful way of telling me the total time, Media Player.
Artwork by petite_madame. Seriously, check it out; it's all lovely.
Summary (by author): "Death threats are an unfortunate side-effect of being Tony Stark, so he's learned to ignore them. The problem is, when someone really wants you dead, hiding your head in the sand just kinda exposes your ass.
But it's not just Tony's behind on the line. Whoever wants him dead wants him to suffer first, and they're willing to do anything to make that happen. Tony knows there's only one way out. To save Steve, the Avengers, and the general public, Tony has to die. Of course, death isn't always the end, and Tony does what any other self-disprececting scientist would do: he finds a way to fake his death and avenge his own murder.
The trouble is, terrible decisions usually have a terrible price, and this one is no different. Tony has a chance to save the day, but the cost may be more than Tony was ever expecting to pay..."