It's a scene that I adapted off a short fanfic, which can be read here
leagueoffics.tumblr.com/post/8…Out of context of that fic, I think the core idea behind their interaction/bond was their similarities in being the younger sibling of a renowned house, used in service but then probably unloved by their own families. No doubt the Demacian/Noxian rift would make instant enemies out of them, but this is a scenario of 'what if' they had met in general peace?