How do I tutor someone without writing their essay for them?

It’s just my little brother, he’s 14, and he has trouble completing his assignments on time. I’m helping him with his English essay, (which is on a book I haven’t read, but isn’t exactly complicated to pick up on)

I’ve helped him to create an essay plan by asking him questions about the novel, but now he just doesn’t know where to go. We don’t have a lot of time, and I find it’s easier to just dictate his essay to him. How can I help him to find his inner intelligent writer?