Extend the Story - Add a Room

This can't be right. There's gate nine and then gate ten... okay stop and think. You wouldn't have been accepted to Hogwarts if they didn't think you weren't up to this. Nine and three-quarters, nine and three quarters... You still smirk at your father as he wanders back and forth, scowling. Okay, time to put him out of his misery, you're the mage in the family, not him.
Still, you'd better get your bearings soon enough if you don't want to appear a complete fool. Thank heavens for your dad's mania for getting anywhere way too soon.
Let's see... "Dad, maybe it's in the middle. You know, it's a fraction, right between nine and ten."
"Now how on earth can it be in the middle, genius? There's just a post there!"
"Well, it's a magic school, isn't it? So maybe it's a magic gate."
"Okay, you're so smart, you find it!"
"Dear," your mother starts, but you wave her off, acting like you know what you're doing. At the same time someone approaches your family. You don't recognize him yet you feel you should.

You end up swallowing your pride and walk back to your folks.