Characters/pairings: Steve/Tony, Bruce, Natasha, Pepper, cameos from Clint and Thor (past Tony/Pepper, Steve/Bucky)
Summary: Steve wasn’t sure when he started finding Tony amusing rather than annoying or when he started calling him a friend, but it probably coincided with when he decided to actually move into Stark Tower and tell SHIELD they could stop paying the rent on his apartment.
A/N: Written for the prompt friends to lovers. I tried to include as much of what you asked for as possible though I couldn't quite manage fake boyfriends, but there is a nod to it. I hope you like it! So many thanks to lil_shepherd for the really fabulous beta, any remaining mistakes are completely mine.
Link: LJ DW AO3