Great idea on paper, but the fact that the shortness means that there isn't even just a line about the Doctor undoing the whole system with even a button press makes the Doctor a-okay with slavery, I guess.

Wait, so the Doctor is just alright with them being slaves because they're "lazy"? That's a little weird!

Has a fun concept and I like how the story comes full circle in the end. The plot isn’t anything special, but I didn’t get bored reading it.