How long until Lucas lets it slip

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Transcript:
Finn: [screaming] Make it stop! Make it stop!!
Lucas: S-Sorry. It did what I thought it'd do through.
Finn: [screaming] Don't do that again!
Lucas: Okay, okay, I promise. So, what's the plan?
Finn: I'll book a flight to Siroc with Maeve. We can go together.
Lucas: [screaming] A flight?! You guys have flying machines?
Finn: Lucas, stop saying "You guys". Nobody must know you're a Zel, okay?
Lucas: Okay...

Characters:
Lucas (♂) : Arbrool (red)
Finn (♂) : Axaqueue (blue)

Lore:
Axaqueues: blue creatures, control water
Arbrools: red creatures, control fire
Etrikits: yellow creatures, control electricity
Stodocs: purple creatures, are very strong
Norooits: green creatures, control wind
Zelonams: Lucas's original species
Hybrids: Creatures of two different species
Ripple: Finn's village
Atlas: the capital city of Azimuth
Azimuth: Name of their world
Anomalies: Kinda like portals