The thought that lingered in Sarah's mind was that she had seen a picture of a beautiful girl in Charles's wallet when she had helped him pack his things up. The picture was of a girl with short hair, who was wearing a high school uniform and looked incredibly cute and pure. At the time, Sarah had thought that the girl was his sister or some sort of relative, so she secretly put the photo back in his wallet. However, when Charles came in and noticed that she was looking at his wallet, he was very quick to take it away.
Sarah asked him who that girl was, but Charles seemed a little nervous and answered ambiguously, "Why do you ask so many questions?"
At the time, she didn't take his embarrassment into consideration, but asked curiously, "Is she your sister? When will you put my photo in your wallet?"
Charles smiled, "Somewhat. Put your photo in my wallet? I can buy a hundred wallets for you to put photos in."
"What a miser you are!" Sarah said playfully.