I think it was on AO3 And it had this plot:
Tony and Steve ( plus maybe ask of the avengers( and I am pretty positive that coulson was there)) are at a charity gala dinner thingy and they have to sit with an annoying senator and his family. Tony tries to sit by pepper or Steve but the senator's son insist on sitting by tony. He then starts casually touching tony, and tony seems highly uncomfortable. The touches progress into groping and tony flees( or something). Toby gets into a car by himself but Steve gets in too. Then tony explains that the son was a bully to him and went as far as raping him.
+ I think it is in Steve's POV
+ at some point Steve thinks about how the senator's son looks like a football jock
+ they pull the car over because something stops working and Steve asks if tony can fix it and tony is like " with what?"
+ the cops come and pick them up
That's all I remember but I someone could be so fabulous as to find it for me, that would be great.