In it Tony travels back in time to WW2 and has to pretend to be Howard's brother. Howard thinks Tony is his nephew. Steve and Tony get together during this time and when he goes back to his own time he and Steve continue the relationship. Oh, and Steve in the future didn't know at first that past!Howard's brother(future Tony) was actually Tony. Until he got sent back.
Sorry if that's confusing. Any help would be great!!!