Niki dug his fingers into the box after her and pulled out a black one that he thought might be licorice, but turned out to be petrol. He made a rather considering face as he chewed it, and decided it wasn't his favourite, at all.
"I went to Hogwarts," he said. "You went to Hogwarts." He scrutinized her for another moment and then realized who she was (she thought).
"Oh. I know." She hadn't been in his year, but a year below, Niki thought. "You're Elbert's sister." Because Ellie would always be Elbert in his mind.