Page 458 - Best of Kin

Story Time! Talk about a really strange pet name that somehow stuck.

DM: You know, I didn’t put in Shining Armor to antagonize you.
Twilight Sparkle: I… I’m sorry.
DM: Touchy subject?
Twilight Sparkle: I guess so. To be honest, I’m kind of surprised at my own reaction.
Fluttershy: Do you want to talk about it?
Twilight Sparkle: I’d rather not, actually. Sorry.
Fluttershy: No, no, that’s perfectly okay.
DM: Well, you’re free to define how well Twilight gets along with Shining, but… I never intended for there to be a rivalry. As far as I’m concerned, they never had a single fight. In fact, you could say that Shining Armor is your BBBFF: Big Brother Best Friend Forever.
(beat)
DM: No? …Okay.