The premise: Steve and Bucky are both nabbed by Hydra. They take Bucky into a room with a two-way mirror, and Steve into the observation room, although Bucky has no idea he's there (and possibly no idea Steve was also captured, if that works better). They proceed to gang-rape Bucky while Steve is forced to watch. Throughout the entire ordeal, Bucky never figures out Steve is watching him.
+ Steve's burden afterward is how to be honest with Bucky without hurting him worse
+ Steve is also coping, badly, with his trauma over being forced to witness this, but of course he won't even acknowledge his own violation
+ When the truth is revealed, Bucky is DEVASTATED. Because in my imagination, if he had known Steve was watching, Bucky would have tried to act as tough and unbreakable as he thinks Steve himself would be, and as he thinks Steve would expect from him. But after years of rape, Bucky's coping mechanisms aren't Steve-approved "Blood from a Stone"-esque comebacks and defiance. Maybe he would have fought at first, but after a while it would have been disassociation, limp acquiescence, even participation to make it end faster, or some screaming and begging and crying when something overwhelmed him. He thinks he broke for them because he didn't know who he was exposing his brokenness to, and he's so ashamed Steve knows that about him now.
non-con voyeurism
+ Steve's burden afterward is how to be honest with Bucky without hurting him worse
+ Steve is also coping, badly, with his trauma over being forced to witness this, but of course he won't even acknowledge his own violation
+ When the truth is revealed, Bucky is DEVASTATED. Because in my imagination, if he had known Steve was watching, Bucky would have tried to act as tough and unbreakable as he thinks Steve himself would be, and as he thinks Steve would expect from him. But after years of rape, Bucky's coping mechanisms aren't Steve-approved "Blood from a Stone"-esque comebacks and defiance. Maybe he would have fought at first, but after a while it would have been disassociation, limp acquiescence, even participation to make it end faster, or some screaming and begging and crying when something overwhelmed him. He thinks he broke for them because he didn't know who he was exposing his brokenness to, and he's so ashamed Steve knows that about him now.