Kitana and Koya were extremely surprised after knowing who Rein, Lopas and Luna were. As they were from the magic academy, Koya and Kitana were aware of the possibility that their life savers might be from a noble family but them being from a ducal family and the royal family was something that no one had expected.
Kitana was extremely nervous as basically in this city their organisation were technically going against the royal family by opposing the governor chosen by them. That was the reason why Kitana became nervous after knowing Luna's true identity.
But Luna told her not to worry about it and she was on their side. This was a great thing for the Serenity Peace as now even the royal family was with them.
This was something very major and Kitana immediately wanted to inform the higher ups of the Serenity Peace about it. Rein also thought that it was a good idea, as to make a more concrete plan, knowing the leaders of the Serenity Peace was important.