Upon hearing Vitani ask if he was coming, Nuka's initial thought was to answer negatively, given that he didn't have a big role to play in his mother's new plan once again. He spent another moment just laying still but then another though popped into his mind "What if today is the day, something might go wrong... Today might be my chance to shine!". And with this thought he answered finally "Yeah yeah" and forced himself up from his slumber.
As he and Vitani walked out from the dark den and into the sunlight where the other lionesses were heading he turned to Vitani and said Looks like I was right about Kovu, if mother had chosen me to be a part of a plan once in a while, we'd be ruling Pride Rock by now.
The jealousy was clear in his voice by this point, this is the second time he had not been assigned a higher ranking role in his mother's plans, despite believing he was key to the outlander's succession.