Status
If a tree wants to kiss you, it's a sign of your status. Only someone of high status would be worthy enough to receive the gnarly but gentle kiss of a tree. Trees don't kiss just anyone, you know.
かく
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The best way to convince a tree of your status is to say "cock-a-doodle-doo" at it, like a cock (かく), i.e. a male chicken. Trees really place a lot of status on the ability to sound like a cock crowing.
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