John wonders, idly, if Sherlock is just really hopeless at being subtle or if he barely even tries at all. Not that it really matters which and, either way, he rather enjoys all the reasons for spending time with him that Sherlock throws his way even if there's obviously no need anymore. Which is probably also why he mentions all these ideas too, because Sherlock apparently isn't much for doing what people usually do when they... socialise.

Everything considering, exploring the school isn't exactly a strange one at all. A lot of people enjoy doing that, and he imagines that doing it with Sherlock probably brings an added spice to the project. Worth a shot, definitely.

"Not a deal breaker, but, yeah, that helps."

Might make it possible to pick up the habit the teachers have of popping up without warning, and that would honestly be a real blast to have. Something to aim for, even.

"I could become one of those really obnoxious prefects if I had a mental map of every nook and corner of the castle."

It would be hilarious.