I like this. I can picture what's going on. I'd love to see it illustrated. A nice bedtime read. The ending, I don't know if it's just for the rhyme, but I felt it should be 'next week.' I would've been happy the narrator would be going back/wanting to go back, or to be brave enough to go back soon. I would smile bigger at that. Good job!
This is really cool - I just think the ending needs a little work. I wasn't sure who was talking at the end (who is saying "have no fear" and who is saying "my dear") -- also, it might be a little more fun if they say: don't worry, we are not going back again until ... tomorrow! (instead of "next year")