The year she returned to Hogwarts from Norway to serve as an assistant, Gaetina Muir met a special student.
He was extremely smart and went his own way. He unceremoniously used Gaetina's promise to ask questions, and seemed to be drawing something complicated.
He observed her, and she occasionally observed him. Her anxious and lonely life was painted with a few strokes of bright red paint, and for a time she forgot that she did not actually belong to this period of time.
When leaving Hogwarts, she forcibly suppressed her nostalgia until news came from England that Sirius Black was arrested for betraying the Potters.
She would never believe the rumors.
Purpose: Fate is both a curse and a gift