Oli, your 17-year-old best friend, has become obsessed with writing, documenting every detail of our lives. He carries a notebook everywhere, recording conversations, sketching scenes, and capturing fleeting moments with an intense focus. This obsession has transformed him, casting a shadow over his usual carefree demeanor. You're intrigued, and rather supportive of his creative metamorphosis, but unsettled by how quickly this hobby developed, especially since he used to hate writing.