Anyway in this story they went back to the planet for help (I think Tony was dying) and Tony ended up getting kidnapped along with a lot of other creatures from the planet. He was made into a slave and was raped by the army every night. He tried to make an escape plan at one point but was caught and severely punished.
Steve eventually found him with the help of Thor but it took awhile and Tony was completely subservient when they found him. It took a long time for him to begin to get back to how he was before. Also he panicked because he'd told the slavers (Kree maybe?) where earth was and he thought they'd come attack.
Also there was a blanket.
Hope someone knows what this story is. It was definitely on Ao3 if that helps any.