There's a common trope in trashchat of Bucky coming in from the cold and then thinking he has to sleep with Steve and/or the other Avengers.
There's also the line in CA:tWS where Fury tells Steve something about how Natasha is willing to do anything.
So: I want to know what happened when Natasha was brought in to SHIELD by Clint, figured out that Fury was the director, and immediately set out to seduce him in to her bed, because that's what powerful girls in the Red Room did to curry favor with the people in charge of the Red Room. She knows she's somewhere new, and she knows they're "good" guys, so she goes with the "sad, rescued, innocent" damsel routine. Soft eyes, soft touches, "accidentally" leaning over in a short skirt or a soft, oversized tshirt, not taking no for an answer, because no never meant anything in the Red Room, and some of her previous superiors would make a show of protesting that they couldn't take advantage of her, but once she figured out what they were into they always eventually gave in.
Up to fillers how it ends. Is she furious with herself when she doesn't succeed? Is she embarrassed when she finally realizes that Fury really doesn't have any interest in sleeping with someone under him who's only seducing him to curry his favor? How far does she up her game before she stops/someone convinces and/or makes her stop? Does she sleep with anyone else (like maybe secret high-up Hydra Agents who are thrilled to have a Black Widow around and easily available), or does she try to keep herself "pure" for Fury? Does she sleep with random people to increase her sad damsel "please save me!" routine?
tl;dr: Natasha has a Red Room trash past and tries to seduce Fury when she first joins SHIELD.
Nat/Fury trash
There's also the line in CA:tWS where Fury tells Steve something about how Natasha is willing to do anything.
So: I want to know what happened when Natasha was brought in to SHIELD by Clint, figured out that Fury was the director, and immediately set out to seduce him in to her bed, because that's what powerful girls in the Red Room did to curry favor with the people in charge of the Red Room. She knows she's somewhere new, and she knows they're "good" guys, so she goes with the "sad, rescued, innocent" damsel routine. Soft eyes, soft touches, "accidentally" leaning over in a short skirt or a soft, oversized tshirt, not taking no for an answer, because no never meant anything in the Red Room, and some of her previous superiors would make a show of protesting that they couldn't take advantage of her, but once she figured out what they were into they always eventually gave in.
Up to fillers how it ends. Is she furious with herself when she doesn't succeed? Is she embarrassed when she finally realizes that Fury really doesn't have any interest in sleeping with someone under him who's only seducing him to curry his favor? How far does she up her game before she stops/someone convinces and/or makes her stop? Does she sleep with anyone else (like maybe secret high-up Hydra Agents who are thrilled to have a Black Widow around and easily available), or does she try to keep herself "pure" for Fury? Does she sleep with random people to increase her sad damsel "please save me!" routine?
tl;dr: Natasha has a Red Room trash past and tries to seduce Fury when she first joins SHIELD.