Series: Fullmetal Alchemist
Title: "Endo, Exo"
Character(s): Roy Mustang,Ling Yao, mentions of Riza Hawkeye and Lan Fan
Rating: G
Disclaimers: "FMA" belongs to Hiromu Arakawa and Square-Enix. I just play in the sandbox.
Note: Post manga. Too much listening to "FMA: Brotherhood"'s 5th opening as inspiration, "Rain" by Sid.

Written for fma_fic_contest prompt 92 "Flame".

( Endothermic: "within-heating"; exothermic: "outside heating". Roy learns to perform both. )