Requirements. The requirements are whatever we deem it to be.

[They do what they want! It's their wedding, after all. (Of course, this will take a bit of discussion with Grell, and Ardyn will likely sometimes feel in over his head due to planning hell, but.... he'll survive. In the months to come, they'll probably get it all figured out.)]

But there's plenty of time to decide. In the meanwhile, I would like to hear what you have in mind someday.