Nightmare Moon's fetish (questionable)

Disclaimer: I don’t mean what fetish Nightmare Moon has as a character.
 
Each of the villains seems to have what I’ll call a “companion fetish”. That is, if you’re going to write a clopfic with them, it’s very easy to decide what kind it will be.
 
King Sombra: sexual slavery, maybe harems  
Queen Chrysalis: oviposition, mind control, maybe bondage  
Discord: corruption, hypnosis, mindbreak  
Nightmare Moon: ?

Corruption and sensory deprivation.

Cold and darkness perhaps?
 
Eternal night would be very cold so she might like that.

I’d like to say praise and admiration, but that puts her in the same league as Trixie, Dash, and I don’t know, Diamond Tiara, I guess.

@Princess♠Molestia  
Perhaps a freezer fetish? I invented it in my mind, it’s basically when you cuddle/make out/have sex in a freezer.

Bondage, with her being the dominant one.