'What is going on?!' Aria gets panicked when Arthur begins to act so boldly suddenly. 'I should scold him! Make him retreat and behave!! But...'
She can't find any negative feelings inside of her about Arthur, just good feelings, even though some seem extremely wrong.
"Mother..." Arthur is not in a better position. He loses all coolness that allows him to act quietly near Aria. She wakes his deeper and more intense feelings, blinding him to anything other than herself.
"No, darling~" She wants to pull her hand, but her body does not obey her when it comes to moving away from her beloved son. "We can't do that..."
Arthur continues to hold her hand firmly and stretches his tongue out, slowly licking her fingers, still covered with her most private fragrance. 'Ohh, this taste... it's different from anything...'