Stories, I've read some of them, though I wasn't able to find every of the ones I loved, here a short list of the ones I did, all of them Steve/Tony:
If you like Marvel Noir stories , that means setting is during WWII, Look here, look back, look ahead (http://archiveofourown.org/works/160223) by marinarusalka is a very good one to read.
Hero Worship (http://archiveofourown.org/works/974723) by Wordsplat, if you were hoping to get long fics, it's sadly short, but too lovely to miss, and Wordsplat is a favourite author of mine.
The Twice-Told Tale (http://archiveofourown.org/works/411599) by Arysteia, short too but it's very good.
And the last one I was able to find is an Alpha/Omega verse AU, wrote for kinkmeme prompt "Omega!Tony falls in love with tiny Alpha!Steve", the story is here (http://avengerkink.livejournal.com/1405.html?thread=29266045#t29266045), I remember I quite liked it, ABO verse notwithstanding, but I'm not sure if Steve become Super Soldier Serum later in the story.
About your other question, there's wingheads community "dedicate to the all things Captain America", includes any character that has ever been Captain America as well as Cap related legacy.
There's also virgin Captain America community here: virgin_america.
Or theinvaders community devoted to Steve's WWII team and it's members and friends.
no subject
If you like Marvel Noir stories , that means setting is during WWII, Look here, look back, look ahead (http://archiveofourown.org/works/160223) by marinarusalka is a very good one to read.
Hero Worship (http://archiveofourown.org/works/974723) by Wordsplat, if you were hoping to get long fics, it's sadly short, but too lovely to miss, and Wordsplat is a favourite author of mine.
The Twice-Told Tale (http://archiveofourown.org/works/411599) by Arysteia, short too but it's very good.
And the last one I was able to find is an Alpha/Omega verse AU, wrote for kinkmeme prompt "Omega!Tony falls in love with tiny Alpha!Steve", the story is here (http://avengerkink.livejournal.com/1405.html?thread=29266045#t29266045), I remember I quite liked it, ABO verse notwithstanding, but I'm not sure if Steve become Super Soldier Serum later in the story.
About your other question, there's
There's also virgin Captain America community here:
Or
Then, there're some pairing focused communities:
And kink memes of course (where some great stories were posted if you look for them):
Hopefully some of those links were what you were looking for.