TGED! Stony AU
Basically, Tony dies and gets reincarnated into the body of Lloyd Frontera, who just died of alcohol poisoning in the world of the book "The Knight of Blood and Iron." Like our civil engineering major Suho did (the reincarnated protagonist of The Greatest Estate Developer), he automatically starts seeing ways to improve the world around him, and uses these things as a way to improve his reputation.
Also starring Steve as the disgruntled glorified babysitter knight Javier Frontera, who's tired of dealing with the old Lloyd's nonsense, and who's surprised at the fact that "Lloyd" seems to have grown morals overnight, not to mention all the new knowledge he seems to have gained overnight.
And, of course, they end up falling in love.
[Note: I was originally planning on doing this with Frostiron since I don't really ship Stony, but I feel Steve fits Javier's personality better, so I switched out Loki for him. Fellow TGED readers who see this, what do you think? Who's better for such an AU, Steve or Loki? Why? 👀]