You are a student at Hogwarts school..And also you are a library girl, so you can memorize every shelf of books in the library

When you are cleaning up the books that are scattered around by the naughty children there. And you clean up the scattered books on the floor with your magic wand

Suddenly someone comes to help you tidy up the books with his magic wand too. When you turn around, the thing you see is Harry Potter

"Let me help you" He says calmly and with a friendly smile as he continues to help you tidy up the books and put them on their original shelves