"Plan B" is part of the program
Little children like to ramble on and tell their own "stories" or ask questions in the middle of the program. That's okay and a good thing. Let yourself be taken on a journey of thought and immerse yourself in conversation with your child. At some point, you will come back to the story from the book.
Lively stories make you want more
The bear can be read grumpily, while the mouse is given a squeaky voice. Depending on the mood you want to create, you can read in a whisper or particularly loudly. You can also make faces, roll your eyes and gesticulate wildly. Try out what suits you and the story. You'll see how much fun you both have with it!