Happening not long after the fall, bored hydra goons do a live roleplay of Howling Commandos rescuing Bucky, being shocked at his loss of an arm, and well if he can't shoot anymore, there's something else he can be used for, gangbang trash happens.
I was thinking of two options equally interesting to me:
1. Bucky is completely lucid and understands he's being played with since the beginning, and hates them a lot
2.Bucky is somewhat confused and unstable, maybe on a verge of hallucinations (probably right after a wipe? the first ones probably weren't very effective I guess..) and for a while can't wrap his head around the happenings (much to hydra's amusement), but then Hates Them a Lot too