Most evenings, I read Little Fish and Mog a story together before I shovel them into bed for the night. And how it generally works is that I read the story to them both, then Little Fish takes the book and "reads" the story back to Mog again; lots of audio description about the pages of the book and a little bit of narration too, especially if there is a shouty dialogue about a naughty child or pet.
Last night, the tables were turned. I dug out an old story cassette. Popped it into a tape recorder (ancient technology now!), plugged the recorder into a special latch box, plugged Mog's switch into the other end of that same box, and Mog read Little Fish a story instead.