"Appropriate? But you said you liked it, right?" She points out, gazing up into deep blue eyes pleadingly. Using every bit of her cuteness to impress upon him. "Mama and papa can't see us having fun, you know..they can't punish us." Alluka reminds him.

She's a lot more intent than she thought she was, insisting on it for no better reason than to see Killua enjoying himself. However, she doesn't know the full weight of her own words. Doesn't know the full implications or why Killua's concerned about appropriateness all of a sudden, she's just preoccupied with trying to play with him. With trying to kiss him like they're a couple. Alluka is so fixated on it that she forgets they're not.