Does anyone know how to get Celeste's side scene? It's the only one I'm missing up to the current build.

During the class interaction with celeste, I forgot what was written in the choice, the important thing is to choose the third or fourth choice, after that you will be told to buy or make an item in the bookstore, after that interact again with celeste in the morning. And do you know where to get side lilly, I have one left.