I glanced over it the first time, given larger things were worth discussing first, but the irony of Kaguya vehemently defending Tian Zi's right to choose her lover makes that scene doubly hilarious.

Kaguya spouts on and on about how it's all about love, what is in one's heart, and politics must be kept out of it at all costs....while she boasted that she will be Zero's wife for political reasons, such as a method of legitimizing his leadership with the Japanese people, in addition to comforting him as only a true Japanese wife can do, etc etc.

She might legitimately love Zero now, and the first one to suggest that Zero start a harem, but she was all about the political motivations back in season 1.