The Princess(es) of the Kairu

As Ky bonded himself to the prism kairu in the season finale, he inadvertently pledged himself to an immense control of it. In order to keep balance, he must marry a princess of the kairu. Normally, he would have married the first born princess, Priscilla. But she is already married. This leaves only the younger princess, who is none other than... (spoilers) Please R&R