Title: Logopetria and it’s sequel Eloquence.

Author: Lavvyan (original) and Taste_is_sweet (sequel)

Author’s Summary: John watched in horrified fascination as Rodney literally choked on his words, strangely-shaped objects spilling from his mouth in utter silence except for his coughing and ragged breath.

Cracked Summary: The one where Rodney starts speaking objects instead of words

Notes: The fic itself is preslash, with the sequel being slash. There’s also a rough first edition comment fic for the sequel here.