For the ask meme: Sam/Steve/Bucky (ALL CAPS!), #1, please! I loved your a/b/o fic, I can't wait to see what you do with soulmates!
Okay, my first attempt at this slid rapidly into Angst and also wanted to be several thousand words long, so with attempt number 2 I course-corrected all the way into borderline crack. Here’s an alternate take on how the bridge fight might have gone in an ALL CAPS soulmate AU in which Sam Wilson was Done with everything.
The connection snapped into place right as the Winter Soldier ripped the steering wheel out of Sam’s car, and just like that, Sam had two soulmates taking up space in his head.
Even amidst the panic, adrenaline rush, and ridiculously misplaced outrage (he had just paid off his car loan, goddamn assassins smashing up his goddamn windshield and driving up his goddamn insurance premiums), Sam had a little room left over to feel exasperated at the universe’s sense of timing, which was utter shit. He had found his soulmates, whoop-de-fuckin’-do, and thirty seconds later one of them was fighting the other to the death. Because of course they were. Of course Sam couldn’t have a nice, normal soulmate meeting; his had to be full of dramatic white boys and automatic weapons fire.
“Bucky?” Steve had lowered the shield and was giving the Winter Soldier puppy eyes. The serum must have shoved his self-preservation out of the way to make room for all the muscles.
The Winter Soldier–who was Bucky fucking Barnes, fuck Sam’s life–fired at him. Steve barely got the shield back up in time. Sam groaned and started running towards them, praying his scary assassin soulmate wouldn’t kill his giant sitting duck soulmate before he could even introduce himself properly.
When Barnes fired again, Steve yelled through the bond. Bucky, STOP!
Sam leapt over a car trunk added his own mental shout. Stand down, soldier!
Barnes paused, his gun still pointed right at Steve’s face. Sam moved closer, edging around Barnes in a wide circle until he was almost within arm’s reach of Steve.
Then Barnes shifted the gun to point at Sam, and Sam froze with his hands up.
“Bucky,” Steve said desperately, “don’t do this. You know me. Sam’s ours. He’s the one we were waiting for, Bucky, remember?”
Barnes’ eyes darted around wildly, but his aim was perfectly steady. “Who the hell is Bucky?”
Instead of answering verbally, Steve pushed a rush of memories through the bond. Sam winced and instinctively tried to cover his ears. Barnes wound up on his knees with his arms wrapped around his head.
“Who are you?” Barnes said, out loud and through the bond. I can’t–
We’re your soulmates, Sam said.
Barnes looked up, eyes lost and confused, his mind tentatively reaching out, and it was a touching and heartfelt moment until Natasha dropped down behind him and tased him into unconsciousness.
“Natasha,” Steve said, scandalized.
“What? Hydra’s coming, we gotta go, find a car to hotwire and move your ass.” She grabbed Barnes around the middle and sagged under his weight. “Wilson, grab his feet.”
Sam helped the Black Widow haul one of his soulmates into the backseat of an abandoned minivan, where they dropped him onto a pile of dry cleaning and fast food wrappers. Sam collapsed onto the seat behind him and made a conscious effort to look on the bright side. At this year’s Thanksgiving, he was going to absolutely crush the Who Had the Most Interesting First Soulmate Meeting competition.