We Set a Precedent, and Now I’m Living With It (слэш)

"It's lucky we met tonight," the guy says, sleazy and in Bucky's space in a way that has all of Bucky's defenses climbing up. "You know, after you finish that drink —"
"I am so sorry I'm late, babe," a deep voice it takes Bucky a second to recognize says from behind him. The voice comes with a hand placed firmly on Bucky's shoulder. Bucky blinks and looks up to find hot-Steve-from-work smiling at him, one eyebrow raised conspiratorially.
Bucky bites the inside of his cheek to keep from grinning as he catches on.
"Boss trying to talk you into working overtime again?" Bucky asks, putting as much fake worry into his tone as possible and leaning into Steve.
(Or: Work friends Bucky and Steve get into the habit of helping each other escape uncomfortable, awkward, or bad situations. Their escape plans get increasingly elaborate as their friendship gets increasingly close. That's probably why their whole office thinks they're actually dating.)