Fics like you don't know what you don't know

Francie Schwartz claimed to have found a love letter from Brian to Paul during her brief residency at 7 Cavendish Avenue in 1968 - in a world where she is not full of shit but also does not exist, John discovers that letter instead while he and Yoko are guests chez McCartney in the summer of '68. It goes about as well as you think it would. Based on this prompt.

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