Set in my "Next of Kin to Chaos" series, but no Star Trek knowledge is needed for this story. More or less direct sequel to "Discord's First, Last and Only Friendship Report", but not humor. Celestia summons Discord to explain himself regarding his ridiculous "friendship report", but the conversation quickly diverges. Discord wants to know what Celestia wanted to reform him for, and what he's expected to do. And Celestia wants to know why he decided to reform.
A page for this series now exists: Next of Kin to Chaos
Edited to add: The marvelous zabchan drew me this lovely cover art! Thank you!
Somepony seems to have thought it would help Discord with staying on the straight and narrow if he were required to send Celestia reports on friendship, like Twilight Sparkle does. Somepony was plainly out of their mind.
Discord wants to know why Celestia wanted to reform him. Celestia wants to know why it worked.