This story is a sequel to The Great and Powerful Mission- a Genetic Research story

Trixie, in an attempt to become better at teaching her sister new skills, declares herself Twilight's new student. Reluctantly, the Princess lets the magician shadow her to a meeting.

This story takes place after the second chapter of Peacevic the Rapper in...
Hooray for crossovers!

Part eight of the Genetic Research series. Start at the beginning here
Sequel here