LFS Winter Soldier assassin hired to do a hit on Tony Stark
But Steve keeps getting in the way. See, Steve recognizes WS as Bucky, so he's trying to keep Bucky from killing his friend, but also keep Bucky out of SHEILD's hands. There are clips from the different reports of the attempts, Thor's is in ALL CAPS.
There is scene where Bucky and Steve have a fight in a hotel room, that they set on fire, and Bucky gives Steve a blow job while holding a gun to Steve's head.
Does this ring a bell with anyone? I could have sworn I read it at Ao3, and had it bookmarked, but I'm not finding it.