but doesn't it get lonely riding up there to the sun?

[The Doctor spent... quite a bit of time at a randomly picked convention on an also randomly picked world, looking for Setsuna's model. Well, strictly speaking picking the model out took him all of about 5 minutes, but he got distracted. First of all, there was the half hour or so spent studying the backs of the boxes trying to figure out how the real things would work. Then there was the hour or so he spent looking at all the other dorky merchandise - he was sure that he saw what must have been a cuddly adipose of all things, and then he got temporarily caught up deciding whether or not to go and see Brad something-or-other the voice actor speak in the corner.

(Deciding no probably held him up just as much as if he had said yes due to the sheer number of people who stopped him to compliment him on his "amazing Tenth Doctor cosplay" and take pictures. He had to hide several smirks from people, especially the ones who said "Wow, you really look like him!").

Eventually, however once the mun stops writing in-jokes into her RL, he managed to drag himself away from the convention and into the TARDIS, setting a course for the island that the now-children were on, and making sure to avoid the area that had the giant robots hidden in it - sure, he might have it all figured out (mostly) and might also be itching to examine them up close, but he didn't want to give the poor boys heart attacks after all.

So he parked on a suitable stretch of beach and walked out of the TARDIS with a brown box under his arm, whistling tunelessly.]