They'd still have that in any number of fics set later on, but around six or seven, before the "Boys are icky/Girls have cooties" stage, it'd be adorable to have one chance meeting, as both Klaus and Barry were on the move with the kids around that time. I'm thinking the sort of thing where they have the type of instant friendship only the very young can form -- "We share a common interest? Cool!" "Let's be bestest friends!" and then they forget about it entirely once they grow up.
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