An Unexpected But Special Meet Closed

It's a normal day, so normal that you'll never expect something unusual to happen. Cassie just had her charms lesson and decided to stay in the library to finish her homework and read some books before her astronomy class starts at night.
She finds a desk near a window and spreads her parchment paper. 'Tarantallegra...let me check my notes.'she says quietly. She takes out her notebook, it's a well-designed book which her mother bought her in a muggle's store. Personally, she thinks it's more useful than a deck of parchment paper. Slowly, she turns page by page until she finds what she want.
She dipped her quill in the ink and started to write. She was a smart girl in her relatives' eyes, and she want to be the best student at Hogwarts. She wants an O.
Question by question, she writes carefully, trying to put every bit of information she knows inside. Finally, only one question left. She yawns and stratches her body. One hour has passed. Looking at the empty seat beside her, she somehow felt lonely. Ever since she entered Hogwarts, she only made one friend, Gryffindor girl Elizabeth Brown. Now Eliza is having a class, so she has no one to study together. If only someone can study with me, she thought.