I wrote Sherlock (2010 tv drama) fanfiction.
Here is the summary:
When a sudden illness scatters Sherlock’s memories, he decides to rebuild his mind palace from the ground up — logically, methodically, obsessively. The problem? Logic can’t reconstruct what love built in silence.
With John as his self-appointed “assistant architect,” the two navigate corridors of memory that are equal parts brilliant and absurd — complete with singing subconscious villains, alphabetized emotions, and the occasional tea break.
As the palace burns and rebuilds, Sherlock discovers that every important memory, every moment that matters, has one constant variable: John.
A quiet, humorous, and tender story about rebuilding a mind, rediscovering love, and finding order in the beautiful chaos of two lives intertwined.
You can read the story on fanfiction archive here:
https://archiveofourown.org/works/72791361