I think he just saw how tall and sexy he got.
And all that butt grabbing in the beach at the end.
They only fight for Kairi's attention because they're obsessed with each other. It's the competition.
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http://i498.photobucket.com/albums/rr345/Rakaputra/pjbasis.png
SuperNiceDog - 1, pjbasis - 0