Room of Relations: Extracting ingredients

This is the first story in a planned "series" that takes place in Hogwarts, all about the room of requirements. The backstory will come at a later time, but the gist is: Harry and Hermione have a pact of helping each other fulfilling fantasies in the Room of Requirements. Quid pro quo - I help you, you help me. (All characters are off age, everything is outside the canon story)