Anon asked: I found your thoughts on Ozai's reaction quite interesting. How do you think Ursa would react after finding out that her children hooked up?
Considering the absolute disaster the royal family is, Ursa would be terrified that this could end up becoming another tragedy her children would have to deal with at such a young age, especially when you take into account that Azula is mentally unstable and believes she's unlovable. Ursa would be afraid of allowing it to go on, but would also fear that separating them would mean she would never be able to salvage her relationship with her daughter AND make Azula get worse.
I think she wouldn't be completely sure that what Zuko and Azula feel for each other is genuine, and would only change her mind as time passed and they continued to prove that they were good for each other and were truly in love.
However, that wouldn't mean she would necessarily accept it. Unlike Ozai, Ursa does care for morality, and if the Fire Nation was against incest, she would have been raised believing incest was wrong and would not be happy about her own children not only having such feelings, but also acting on it. If the nation's view on incest was violently negative, she would also fear for their safety. She wouldn't disown them or try to separate them if she knew they were good for each other, but she wouldn't be happy about it and it would take her a long time to come around.
If the Fire Nation did accept incest, or at least was willing to tolerate it, Ursa would leave it alone once she realized Azula and Zuko really loved each other.