I am trying to find I fic I think I read a while back on the archive. It was post-movie and Clint-centric as I recall. Clint moves into the tower's ducts and feeds Bruce takeout in his lab when he forgets to eat. I think maybe Clint finds Bruce's presence comforting while he is mourning Coulson or something. At some point, the rest of the team finds his duct nest and is very concerned, insisting he cannot live like that.
I'm sorry. I recognize that is super vague bit any pointers you have I would be most grateful.