Tony, Steve, Clint -- and I think the others -- were in the Tower and they watched the Downey version of Sherlock Holmes. Clint & Steve notice how much Holmes resembles Tony and Clint checks the credits only to see Tony Stark credited for Sherlock Holmes. Clint & Natasha are disbelieving, insisting they would have heard if Tony starred in a movie. But Tony refused to do any publicity for the movie, so the movie company played down Tony's involvement. Tony said he auditioned because he was bored, I think. Pepper tried to bribe the director to pick someone else? But they picked Tony. Then Tony makes some remark about how he annoyed Pepper by deducting people after he played the part of Holmes.
I'm almost sure the fic is on AO3, and I think it was Steve/Tony. Can anyone help me identify this fic, please?