Rainbow Dash is reviewing a fanfic Twilight has been writing. What kind of fanfic is it?

Comic by Melon Hunter
https://www.deviantart.com/melonhunter/art/The-Fan-Tome-Menace-419457648

Agent0Fluffy as Twilight Sparkle and Rainbow Dash

Music:

South Park- Stick of Truth- Underpants theme

17 - Occhokochoi dakedo ii ja nai from Sailor
Moon Crystal

Glitters Not Gold 2402/6
Tim Garland (PRS)

Bubbu Bubbu Budane, Lucky Star from Lucky Star