Each
You kiss each of your best pals to show them how much you love and care for them. You kiss each friend right on the mouth.
Imagine kissing each of your best friends on the mouth. Does this make you uncomfortable? Excited? Both? Feel that feeling.
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おの
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Actually, each of your best pals are of the cock (かく) variety. By that, I mean they are both roosters. Imagine kissing both of these cocks on their beaks.
Kissing the cock beak is kind of a strange experience. Feel the feathers in your hands as you steady the cock to kiss it. Cock-a-doodle-doo!