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Gabriel overhears Ladybug saying "my Lady" to an akuma or smthn and concludes that she is Chat Noir
(Alya): "Chat Noir, what would you say would be your first defining trait?" (Chat Noir): "My special, one of a kind, trademarked phrase of 'my lady.' " (Felix): "I'm gonna to steal that. In fact, Lila, you look wonderful, my lady." (Lila): "Stop mocking me, kitty. Or else, I'll have to throw you in a trash can." (Gabriel): "Felix is Chat Noir? And Lila is Ladybug? Even though this makes no sense, I've likely found their identities. They'll pay for deceiving me."
New fic prompt: how many ways Gabriel can overhear someone say “my Lady” and conclude that they’re CN.