Usually it's at this point, going to school, where age regression genderbender manga jump the shark... But this manga has been pretty good and laid back so far, keeping it real rather than feeling like pandering fanservice, so I'll keep my hopes up that this'll go somewhere good.
The righteous path for a manga like this, IMO, should be to have the people close to him learn his secret yet accept him anyway. NOT expand the secret until the entire world is fooled and he's effectively trapped in and consumed by his new persona. Too often, the latter is what actually happens, but yeah... this manga has exceeded my expectations.