Words do more than carry meaning; words have a physical aspect too.
Even for readers who no longer have to move their lips while they read, certain words carry with them the relish of being said aloud:
These words are wonderful for showing, not telling: unusual combinations of consonants, words borrowed from other languages, words that make you pout or go ‘ew’ as you say them.
The prompt: write a story that uses descriptive words that make your mouth move.
(This prompt inspired by this excellent talk by Michel A. Arnzen at the Odyssey Workshop.)