While Luce is opening her present carefully, Sora rips into his a lot more quickly, too excited. However this gives him time to smile over it and immediately put the pendant on before Luce has finished opening hers, so he can watch her reaction. Which just serves to make his smile widen.

"I'm happy you like it! I love what you got me too," he says sincerely, holding the pendant around his neck in his hand.