I just go around to looking at Crisis Core and I realized they never told you what was written in Aerith/Aeris' other 88 letters she sent to Zack. So… I got bored and decided to write them for her.
This first letter doesn't count since it was written by her to Zack. It's a sort of teaser to the other letters.
I said I had twenty-three little wishes. But, after a little thought… I've combined them all into one big wish. All I wish for is to spend more time with you. I know you're busy, and I'm sorry if it's a lot to ask, but that's my only wish, and I think that'd be all I'd need to be happy.