When Angels Fall

This is my second attempt at a DESTIEL AU fanfic. This was inspired by a Japanese movie called Koizora (Sky of Love) Hope you enjoy!

Loosing his beloved journal was hell for Castiel. What if it fell in the wrong hands? They could use it as black mail or exploitation! Searching heaven and hell for his journal he finally found in the school's library sitting neatly in the middle of a round table. Upon opening the journal he noticed a small note written with very sloppy hand writing sitting in the corner of the front page. "Take better care of your shit." Despite the crudeness of the note Castiel thought it would be appropriate to leave a 'Thank You' note. After leaving the note he returned to the library only to find another note, written by the same person, sitting in the very same spot where he had left his thank you not. Days passed; Castiel and the stranger continued to communicate by sticky notes. Who could this mysterious stranger be?