Did go off and read a ton of WinterIron. Here's some goodies:
Only three chapters, roughly seven thousand words. Almost cried when Bucky thought he was gonna be wiped!
What can I say? I'm a masochist. Just under 10k, two chapters. It's a soulmate au, very angsty. You have been warned.
A pinky promise means something (when it's with your soulmate)
Really cute. Features kid!Tony and college!Tony. 6k, a chapter and small epilogue. Pretty much all set pre-IM1.
You can tell this one'll be good from the title alone. High school au. Less than 5k oneshot, again super cute. Misunderstandings are heavy for this one. Don't worry, it all works out.
Soulmate au. You can identify them by the first words they speak but Tony's autistic and nonverbal. Yeah, you can probably see the issue. 25 chapters, 35k. It does all work out I swear. Prepare to suffer in the meantime. Oh and it's stuckony. I rarely read that pairing so let this be a testament to how good it is.
Alright the rest of these are old faves (warning I was very much in my anti-team-cap phase back then):
Just do yourself a favour and read everything by Wix! Three chapters, fifteen thousand words. Post CACW, Team Iron Man. Steve is a total douchebag haha.
This one is similarly by Wix. This time a time travel fix-it (I'm such a slut for that trope). Hinted Loki/Tony in this. It's awesome. Tagged as pre-slash. I honestly can't remember. Roughly 30k one shot. Have reread dozens of times!!!
Hades and Persephone au - every pairing needs one of these. Again Steve sucks. Soz (not really). Also female!Tony. I'm not a big fan of the concept but it works. 40k.
I think just the description will suffice for these last two...
Months after the Avengers' dispute in Germany, the team returns to the US and moves back into the tower. As always, everyone pretends that nothing happened. Tony is just fine with this. He's used to pretending, and he'll be damned if he lets any of them see him flinch.
Tony's the bad guy, after all. He's used to it. He's fine with it. He's good at it.
Only now, there's something far worse loitering around the tower - The Winter Soldier. No one notices the guy at first, but when they do, Tony figures that he should have the soldier's back.
Birds of a feather should flock together, and the bad guys should start a book club.
"I'm here to kill you, Terminator," Tony said slowly, "does that compute?"
The soldier looked up at him with wide blue eyes and no expression. "Okay."
Tony froze. "Okay," he echoed. "I tell you I came here to kill you and your response is 'okay'?"
"I am being decommissioned," the soldier said, and for one horrible moment Tony thought he actually seemed relieved. "I understand. I will comply."
Wait wait!!! Nearly forgot this series. It is seriously the best thing ever. Author @everything-withered is lovely.