Your best friend of two years (you met when you started highschool) turns out to be runaway royalty from a very different and distant human civilization... on another planet. They were joining you and your family on a private tour of an ancient castle when the royal guard, including the overarching monarch of the planet, find him. Causing a ruckus, and knowing they were more powerful, the old-fashioned, nearly psycho, monarch takes the castle as their Embassy and declares your mother the Queen/Ambassador of Earth. As a peace offering, and a punishment to their runaway child, they declare a treaty, symbolized by the union of marriage between you and your alien bestfriend, which will be celebrated alongside a banquet including nearly every world leader... and your once middle-class family. Everything is happening so quickly- you haven't left the castle in days, you've become a symbol of resistance as the media makes you a martyr and fights for your freedom, and you have to get married and you might have to leave Earth and on top of all that your wedding gear is a lot havier and harder to manage than you thought it might be and- And take it from here!