If you strictly want non-AU, your best bet might be our Growing Up Together tag, although there’s some AU in there, and thePre-First Avenger and Rebecca Barnes-Proctor tags, although there’s also a lot of AU in there. If you’re okay with canon-divergent AUs, a lot more becomes available where the Barnes Family is featured or where they go meet them post-winter soldier; you’ll find those in the relevant tags.
You can also try these fics:
Steve and Bucky got into plenty of adventures before they were Captain America and the Winter Soldier.
“For the error bred in the boneOf each woman and each manCraves what it cannot haveNot universal loveBut to be loved alone”-(W.H Auden)
A young man perched on a fire escape somewhere in Brooklyn, and began to do what just about every other able-bodied man with a draft notice in his hand was doing right now- Bucky Barnes began to pray.
“Please God, I’ll sure as hell fight for my country” he implored,“I’ll die for it too, as long as you make sure Steven Grant Rogers is happy.”
They always share a bed.They always share a bed when one or the other sleeps over. They just do.
Steve sleeps over at the Barnes Household and Bucky is desperate to fulfill an agreement they made prior.
“Steve is eleven, Bucky twelve, and they’ve been told often enough that they’re getting too old for this: sleeping side by side, sharing space like the brothers they’re not. Neither his mother nor Bucky’s has outright banned this bad habit, but he thinks that’s only because they still expect their sons to grow out of it. That’s exactly what Bucky might do, and it scares Steve, since he could happily sleep like this every night for the rest of his life.”
Steve shakes his head slightly. “You don’t have to try to make me feel better, Buck,” he says, kicking idly at a pebble on the sidewalk. “I know what the girls all think of me, and - ” Steve comes to an abrupt halt, blinking rapidly. He’d been watching the path of the pebble, and it had skittered into an alleyway.
An occupied alleyway.
Occupied by two men who are in a very intimate - and very dangerous - embrace.
Bucky ambles to a stop beside Steve, follows his gaze curiously - and freezes. “Jesus,” he breathes.
Steve knows pain. Has always known pain. Far back as he can remember, hurting has been a part of him.
AKA Steve’s Rhapsody in Pain, Part One: Chronic Illness Edition. Contents: one (1) Smol Steve Rogers with Very Big Pain Problems, one (1) Wee Bucky Barnes with a Very Foul Mouth, twenty thousand (20,000) Nazis in Madison Square Gardens, infinite pining, and excessive use of parentheses.