The Union aspect is not clearly described in the YS manual.  So this is how I would like to play it:

Over the course of this first adventure, you will hopefully become a team.   Be on the look out for an aspect that relates to your character's feelings about the team or their role in the group. Or even just a fancy new toy they pick up in the course of the adventure.

When you have one you like--add it to your character sheet.

Dresden Files doesn't normally have a Union Aspect. It is a cool idea and I like it, but by the book our Aspects are:

Phase 0: High Concept
Phase 0: Trouble
Phase 1: Background
Phase 2: Rising Conflict
Phase 3: The Story
Phase 4: Guest Star
Phase 5: Guest Star

In reply to Warren Reese (msg # 2):

This is what happens when I get excited and copy things off the internet. It's amazing that all my posts don't have a cute kitty gif somewhere.

Do you guys want to have a Union aspect?

We can vote on it.

I love the concept of the Union Aspect. I'm all for dropping the second Guest Star and adding in Union instead.

But if we do that, I really shouldn't Guest Star in Branwen's story. If I Guest Star in Atsa's, Emmaline's, or Musashi's it would widen our web of contacts.

We can always do extra guest starring for back-story without taking an aspect from it... or just run one aspect high.  It's not like the other FATE campaigns will hear about it and come beat up our game and take its lunch money for it.

Id like to do a union aspect

Nah, they won't beat up our game for having eight Aspects. They would mock it.

Yeah, having eight Aspects is fine with me. Another thing to compel for FATE points. Precious, precious FATE points...