My Little Pony: Friendship is Magic - Image #243,204

Bubububu… She's basically his foster mom.

It looks like there could be a few explanations for this.

1) Molestia is disguised as Twilight. Not big surprise.
2) Twilight has learned FAR too much from Molestia. This is plausible, given some of the past Ask Molestia scenarios.
3) Discord.
4) Spike is having a very bizarre, kinky dream.
5) Molestia is having a normal dream.
6) Joseco was bored, and so he made this.