Aeka was due to marry her BROTHER and NOONE sees ANYTHING WRONG with
that arrangement?
Save the flames for the marshmallows, kiddo! There is nothing wrong
with it within the context of the story. Yes, we would think it wrong
for two people from Earth to do that because people of Earth are taught
that such things are immoral. However, because the people of Jurai's
Royal Family are brought up to view this practice as acceptable, Ayeka
and Yosho do not see this as immoral.
Not to mention that it wasn't unheard of for real royal families in Earth's
history, either... Many generations of the various Egyption dynasties did
exactly the same thing, for a similar reason -- to keep the "blood of the gods"
which ran through the royal family's veins from being diluted/polluted.
-- Bob