I love how... unnecessary this is? Yet it's lovely in its own funny way. The cozy set, rickety TARDIS and cute story all paired with Tennant's beautiful voice is lovely. This whole thing is so dang cozy that it makes me wish there was a whole story set on this planet.
I mean, just imagine how cozy that would be? The Doctor lands on a moon made of pillows and blankets inhabited by peaceful, child-like creatures whose only purpose in life would be to tell stories! He sits down, and exchanges stories about his many adventures to these creatures. It could even be a gateway episode! Like he starts telling an "untold" story. The story of the catastrophe of planet bedtime story...
Idk. Maybe I'm tripping, but this cozy short sparked a lot in my imagination. More stuff like this! I love Doctor Who, and the more the merrier.