Oh yes I envisioned a consort, not a king.Their social structure seems to broadly follow a mediaeval European one, in which Kings always outrank Queens. Daeny may choose to marry and perhaps even take a Consort but proclaiming a King would bar her from the sovereignty.
That for example, is why Prince Phillip, Duke of Edinburgh and husband to Elizabeth II, is only a Prince, rather than being King Phillip.
dJE
Dany is "god-touched" and super charismatic; I don't think she has to worry about internal challenges to her sovereignty.