You could try Feed The Rain, (http://spicedwinefanfic.deviantart.com/favourites/43681854?offset=72#/d36q7gv) by Beruthiel's Cat. It actually has OT3's and OT4's, but Cloud and Zack are one of the pairings. I don't know the canon, but I love the story. It's the first in a series, and completed.
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It actually has OT3's and OT4's, but Cloud and Zack are one of the pairings. I don't know the canon, but I love the story. It's the first in a series, and completed.