Steve and Bucky get bodyswapped by the plot device of your choice. And then Steve (in Bucky's body) either gets captured by Hydra or infiltrates a Hydra base by pretending to be a still-loyal Winter Soldier. Either way, he has to play along, obey orders, and pretend various brainwashing trigger phrases still work on him.
Bucky never told him about the sexual abuse.
This is how he finds out.
The garbage of my heart: Steve isn't even held down when they rape him. He's furious, and seething with silent defiance, and he desperately wants to fight back--but he doesn't, because ~the mission~.
For extra-super-awful trashiness, Bucky (in Steve's body) charges in to rescue him, gets captured, and Hydra make them act out the "Steve forced to watch/clean up/participate while Bucky is gang-raped" trope, unaware of the bodyswap twist.
We need some bodyswap trash in here
Bucky never told him about the sexual abuse.
This is how he finds out.
The garbage of my heart: Steve isn't even held down when they rape him. He's furious, and seething with silent defiance, and he desperately wants to fight back--but he doesn't, because ~the mission~.
For extra-super-awful trashiness, Bucky (in Steve's body) charges in to rescue him, gets captured, and Hydra make them act out the "Steve forced to watch/clean up/participate while Bucky is gang-raped" trope, unaware of the bodyswap twist.