No, I'm fairly sure it wouldn't. A king doesn't stop being a king just because he's in someone else's kingdom.

[He almost starts to explain what would make them Desco's subjects - going and conquering their lands as well - but that strikes him as a bad move.]

That said, I'm pleased to hear you won't be the sort of ruler who gets intrusive. Is there a particular reason you don't include the last word in your name as part of your abbreviation?