Hydra + a captive Steve + aphrodisiac-assisted trash party... and then the rest of the Avengers show up and rescue him. Problem is, whatever drug or bastardized Asgardian concoction Hydra gave him, it's still in full effect. And it's the type where you need to get fucked or it'll kill you.

So Steve is freshly traumatized, exhausted, filthy, injured, and ashamed, and wants nothing more than a long hot shower and a lot of privacy. Instead, he has to will himself not to flinch or fight back while the male Avengers pull the world's most horrified and reluctant train on his ass. And he enjoys it.

+ come. so much come everywhere.
++ physically, Steve is desperate for it and the forced pleasure is intense, but the underlying trauma/pain/disgust shows through more and more as the dubcon gangbang goes on
+++ some of them have to go more than once, and round 2 is dramatically different from round 1 (physical injuries healing without a trace, facade of "well this sucks but I can hold myself together" gradually crumbling)
++++ awkward attempts at comfort, especially if it's Tony and they crash and burn due to his chronic case of foot-in-mouth disease