This story is a sequel to Twilight Sparkle Becomes a Changeling Queen, Book 1

Twilight Sparkle is a changeling queen. She has found herself back at the old hive, with old memories... and new opportunities. She brings a new, more pony perspective to changeling problems; and she's very excited to experiment at finding new solutions with the help of her willing and eager subjects.

But some things do not change. A queen must also defend her subjects from any who would do them harm...

Set after season three.