no masters or kings (слэш)

When Loki left Earth in chains following the Battle of New York, Tony and the Avengers had thought (hoped, really) that that was the last they'd ever see of the Chaos god.
But Tony Stark wouldn't be Tony Stark if his curiosity and his attempts at doing the Right Thing™ did not end up biting him in the ass.
And now, only seven months after leaving, Loki is very pissed off and back on Earth. Only, this time, with Odin's blessing and the clear demand that Loki should marry a form of Earth Royalty to 'strengthen the alliance between Earth and Asgard' (yeah, right. Tony recognised a time out when he saw one).
Every government in the world puts forward their royals - or the closest things they have to royalty - because of course who wouldn't want the special benefits of having such a powerful alien race as their in laws?
The US does not have royalty.
But they do have Tony Stark.
(He was never doing a Right Thing™ for anyone ever again)