Newborn Life Replacing All of Us

Isabelle Ackerman thought she had it all.
Zackary Baker had everything but what he truly wanted.
When Belle's fiance decides she's not enough anymore, will Zacky be there for Belle to turn to? Or will something of Jack's doing get in the way?

One shot for contest Avenged Sevenfold Contest

I do not own A7X, only Belle and Jack. Also, this is a pre-written one-shot that I've had on here for a while. I just added the link to the contest, so please don't write me and say I stole this because it is mine.