Relationships:
Brock Rumlow/Tony Stark, James "Bucky" Barnes/Brock Rumlow, Steve Rogers/Tony Stark, James "Bucky" Barnes/Brock Rumlow/Tony Stark/Steve Rogers, Steve Rogers/Brock Rumlow, James "Bucky" Barnes/Tony Stark, Tony Stark/Bruce Wayne, Tony Stark/Bruce Wayne/Brock Rumlow Clark Kent/Bruce Wayne

Warnings/Tags:

Alpha/Beta/Omega Dynamics, Mpreg, Pack Dynamics, Foursome - M/M/M/M, Threesome - M/M/M, Polyamorous Pack, Omega Tony Stark, Omega Brock Rumlow, Alpha Steve Rogers, Alpha Bucky Barnes, Omega Bruce Wayne, Alpha Clark Kent, Triple Agent, Brock is not a bad guy, He's just a little crooked, NOT Hydra Trash Party, Fluff Light Angst, Post-Captain America: The Winter Soldier

Brock Rumlow stumbles into the lobby of Stark Tower, takes off his baseball cap, and stares directly into the nearest security camera.

Immediately, alarms blare and employees scatter in a panic. Within seconds, he has four Avengers poised and ready to strike in front of him; Barton and Romanov have their weapons of choice at the ready while Cap has his shield in hand, and Stark's pointing his open palms straight at him, repulsors whirring threateningly. An exhausted smirk crawls onto his face before he lurches forward and passes out in the arms of a surprised Iron Man.

Finally, they're safe.

"Oh my god, is he pregnant?!" is the last thing he hears.

He wakes up in a SHIELD facility hospital room, wrists and ankles cuffed to the bed in what he presumes is for safety measures. For him or from him, he's not quite sure.

A small movement to his left lets him know he's not alone. Tony Stark's bright, calculating amber eyes are watching him warily from the far side of the small room, the other man sitting on the couch with his arms crossed just under the glowing arc reactor in his chest.

Brock cocks an eyebrow at the billionaire.

"Sooo," Stark drawls out, "an omega triple agent, huh?"

"Ah, so the cat's finally out of the bag," he muses, voice raspy, and lays his head back onto his pillow, wriggling around a little to get comfortable. "Yep, that's me. SHIELD's deepest undercover operative for decades."

"You, Mr. Good-Looking, Ex-Evil, Ex-Hydra Spy," he hears the caps as Stark points a stern finger and wags it at him, "have a lot of explaining to do. Start talking."

"Aw, but gorgeous, I don't wanna," Brock whines mockingly, smirking when he sees the other omega valiantly trying not to smile. "Besides, I need to see –"

Maria Hill and Agent 13 come marching into the room just then.

"- these two lovely ladies."

"Oh, come off it," Maria snorts before quickly gathering Brock into a hug much to their surprise. "You have no idea how worried we were about you. You just dropped off the map and were gone to the wind."

"Good to see you're still alive," Sharon quips before going in for her own hug and a kiss to Brock's stubbly cheek. "How are you feeling?"

"Like I narrowly missed being hit by a building," he snarks, flippantly waving to the scars marring his face. "We got lucky." He absently rubs a hand over his swollen belly.

"Don't worry, you're still as handsome as ever. They only add to your overall ruggedness," Sharon teases with a wink. Brock smirks and wiggles his eyebrows at her, causing her to giggle.

"And how the hell did that occur exactly?" Maria gestures to his stomach as she and the other agent pull up a couple of chairs.

"The Winter Soldier is an Alpha," he grunts and their eyes go wide.

"Are you mated? To him?" Sharon questions, shocked, "When did this happen?"

"Just around the time before everything went to shit and my cover was blown," Brock replies. "I was about to go into heat and the Soldier caught a whiff of me before I could take my suppressants. He wasn't about to take 'no' for an answer either. Marked me for his own," Brock recalls bitterly. "After all these years, it's only now that I slip up something so basic. When Triskelion fell, I needed to get away while I could with my pup and lay low until it was time for the delivery. So here I am now."

"How much longer until you give birth?" Maria asks.

"Not too long. Maybe a couple weeks."

"Do you know where he is?" Startled, the women almost forgot that they weren't alone with Brock, so focused on their bedridden comrade. Tony stands and makes his way over to the bed. "Do you know where the Soldier is now?"

Brock shakes his head, "I may have been his handler, but he was wiped after my heat. The last thing I heard was that he's out of the country looking to cut off the rest of Hydra's heads after what happened on the Potomac."

After that first visit and a debriefing with Nick Fury the next day, Stark sticks to him like glue for some reason. When asked, the billionaire just shrugs and says he wants to. There aren't a lot of people in his life who've stayed in Brock's company just because they wanted to, so he accepts it even though Stark's taken to giving him ridiculous nicknames in part to annoy him, but really it's because some of them are just too good to pass up.

Other than that, the two of them end up getting close alarmingly quick – as thick as thieves – eventually forming an omega sister bond much to both their surprise, but Tony finds Brock a sly riot and Brock finds Tony a witty flirt, so it really shouldn't have been one.

A couple days later, Brock is moved from the hospital to Tony's penthouse inside Stark Tower at the engineer's insistence, claiming he'll be able to relax and recuperate better there within Tony's spacious den than a tiny sterile SHIELD hospital room.

Tony won't admit it but Brock suspects the other omega had wanted children, or had at least thought about it at some point, so he's living vicariously through Brock in the meantime.

The billionaire spoils him rotten and makes sure he's getting the best care money can buy. Medical personnel make regular house calls for all his check ups and appointments so he didn't have to leave the Tower for anything. Other numerous things like decadent gourmet foods and the softest materials that don't irritate his scars start showing up with just the slightest indication of his wants and needs, anticipated by the ever-watchful JARVIS and Tony himself.

Brock could get used to this.

Free room and board in a beyond-luxurious penthouse suite as well as all his medical expenses taken care of for him and his baby, on top of a sister bond to someone like the infamous Tony fucking Stark?

Sign him the fuck up.