The ambitions of the Elves and the Minamoto Clan are clear from the start. They might be subtle in their actions and words, but they didn't hide their interests at all. They intend to make Azzy their clan's son-in-law for political gains.
However, Azzy's shocking announcement of his heir hurt their goals quite a bit.
Now, they were left with two choices. One, they continue to pursue their goal and later take away Affea from the path with either death or expulsion. Two, they give up on Azzy.
Even Azzy knew that when he made the announcement. That is why he did it in front of everyone, as if he was telling them to give up on him.
So, what choice do they make in the end? Azzy wondered after making it clear to them. The guests went silent for a few moments. The Elven Princess appeared a bit sad, and her brother's face hardened.