Fury gives Steve a letter or something he claims is from Peggy and encourages him to call her. Steve shows Tony the letter and Tony calls a phone number given in the letter pretending to be Fury with JARVIS help.
SHIELD has gas (?) put into his appartment that would knock him out in order to convince to move to a safer location. They just didn't expect Bruce and Tony to be there with him that day. I think Tony was temporarily blinded during that incident but I could be confusing this with another scene or another story.
Natasha supports SHIELD's attempts to force an emotional connection between Sharon and Steve.
When it becomes clear that Steve is not interested in dating Sharon, SHIELD then tries to convince him that she is his and Peggy's daughter.
Does anyone know this story?