The Comet - by W.E.B. Du Bois

"The Comet is a science fiction short story, written by W. E. B. Du Bois in 1920. It discusses the relationship between Jim Davis (a black man) and Julia (a wealthy white woman) after a comet hits New York and unleashes toxic gases that kill everyone except them.  Originally published as the tenth chapter of Du Bois's Darkwater: Voices From Within the Veil, The Comet was reprinted in the 2000 anthology Dark Matter: The Anthology of Science Fiction, Fantasy and Speculative Fiction by Black Writers." - from Wikipedia