A white coated pegasus comes to Ponyville looking for a place to move into and a friend to make. Chaos happens and Twilgiht, Celestia, Luna, and the Cutie Mark Crusaders get caught up in it as the white pegasus who came to town becomes a lot of trouble and Luna's only guard from death by a unicorn that wants her soul. Celestia doesn't trust the pegasus and Twilight, and Luna aren't sure what to think but one thing is for sure. He's one son of a Devil.
Wot.
If your asking about what Demon Wolf says at the end of Chapter 5. it's a hint to who his father is.
That was pretty good
Thank you Midnight Aurorus^^