'We didn't start the fire
It was always burning
Since the world's being turning
We didn't start the fire
But we did ignite it
But we're trying to fight it'
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Personally I always felt that these lines described these two well. In my universe, there was always bad blood between the Pridelanders and Outlanders, so Kiara and Kovu's romance was the straw that broke the camel's back. And well... we all know how that turns out!
Lyrics (C) Billy Joel
Kiara, Kovu (C) Disney