You may have to do a little rereading.

It's been awhile since I've written about the two sisters, Celestia and Luna, but that doesn't mean their role in the story is at an end! Far from it actually, there is sister conflict ahead, and as much as I want to just skip ahead to them, I didn't think it would fit yet, I need all the events that are occurring around Flutters and Discord to come to a point of rest, nothing will be resolved just yet, or there wouldn't be a story, and he's yet to stop intimidating her or even hold a real conversation, but I digress.

You may have to look back at how Celestia and Luna begin to bump heads, this will be brought out more in their next chapter, and in full seriousness, this chapter will be serious, it's sister bond breaking time and Discord will not be happy that he's missed it. This will come up after the next two or three chapters;

The Battle
In consideration of Pillow Forts and Princesses
Twilight's failed friendship Picnic (unless I come up with a better title)

And unless another chapter is added for whatever reason, the next should be In Regret of Certain Royal Decrees Which you can assume will be about the two said sisters, because you'd be right.