Very pre-canon, Erica and Annie are both about three.
"Do you like him?" Erica asked Annie.
Annie looked at her baby brother for a moment, then said, "Yeah, I guess so."
"Does he do stuff?" Erica asked hopefully. "If so, can we trade?"
"I don't want to trade him," Annie said. "He's my brother."
"So?"
"So I want to keep him. Why do you want to get rid of your sister?"
"Because she's boring," Erica said. "I want to play with cool stuff like flamethrowers, but I'm not allowed to around Trixie."
Mother, who was sitting with Catherine listening in on the girls' conversation, turned to her, concerned, and said, "You let Erica use flamethrowers?"
"Trust me when I say that was not my decision," Catherine said.
"And something tells me that also wasn't all Alexander's idea," Mother said. "Was it Cyrus?"
"It always is," Catherine sighed.
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Spy School and City Spies Crossovers
FanfictionA collection of crossovers between City Spies and Spy School. Crossposted from AO3