what shall come in future days - Supernatural ficlet, PG, gennish

Title: what shall come in future days
Fandom: Supernatural
Disclaimer: not my characters; title from Milton.
Warnings: character death; misuses of time travel
Pairings: mentions of John/Mary
Rating: PG
Wordcount: 535
Point of view: third

 

( In 1992, Dean and his little brother are walking down a street discussing superheroes.  )