I always figurured that Cloud and Zack were quite similar in character. Only Cloud was more laid back. This old poem talks about that.
And you would scratch your spiked blond hair
and wonder what ying ying meant.
You would watch your love and ponder.
Watch his black hair also spiked but
longer whip around his head.
His dark eyes stared at your blue eyes
His smile warmed you like a blanket.
He stood in a cocky stance while
gently holding your face in his hands.
While telling you that you were the
world to him.
And you thought the same of him
as your lips met.
As you felt his heart beat in sych with yours.
As you saw your reflection in his dark eyes.
And you asked, "Zack? What is a Ying Ying?"
He laughed gently and answered, "That's easy, Cloud.
It means Clear Reflection. I see much of myself in you
so when people say that I am your ying ying I know it
to be true. My precious Ying Ying."
That's all you needed to hear as
you slowly merged with him