If he hadn't overheard from a girl who accidentally let it slip about her candy hoarding yesterday, he would probably still be kept in the dark by her.
The little dummy usually seems dopey and oblivious, but at critical moments she's quite clever. She even knows how to play dumb to outsmart others, teaching those girls to hide things from him.
And she's not greedy, just takes a little at a time. Every day she hides two or three small candies in her pocket, which indeed makes it hard for him to notice.
He wondered why she had been so enthusiastic about coming to school to pick him up recently, and it turned out she was trying to get candy from elsewhere all along.
The little girl was so scared by her brother's teasing that she didn't dare lie anymore, twisting her fingers together and lowering her head, looking like a guilty thief.
