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1, They unnaturally don't get involved with each other.
2, They don't engage with each other, but do some clever gaslighting (Anya sings Phony and starts piano stream, Petra covers her entire body with arrows in Minecraft, etc.)
3, As a typical and obligatory Niji-Holo interaction, they have a collab stream with a chill game.
Needless to say, 1 is best. Although some people may wish 2.