Another item that's the only fic for its canon on AO3, but given that the canon is Catherynne M. Valente's Hugo-nominated novelette "The Difference Between Love and Time" (the heartwarming, heart-rending story of one woman's on-again, off-again relationship with the space/time continuum), that can change. In the meantime, one brave author, as part of a series of reactions to this year's Hugo finalists (which will be announced next month in Chengdu), has written something shorter than I just let this recommendation get, based on a throwaway line or maybe two.
And then led to the writing of Living With Their Legacy.
https://archiveofourown.org/works/48519622
Cat Valente, who on some level will always be McGaijin to me, Wrote:I don’t know why the space/time continuum stopped loving me. (...) Maybe I took too long to lose the baby weight.
Azashenya Wrote:...which lead (sic) to me thinking about what it would be like to be a child of that relationship.
And then led to the writing of Living With Their Legacy.
https://archiveofourown.org/works/48519622