"Mouth shut, butt on bed." Arnon cuts in the moment she confirms, pointing beside himself. Celestia giggles, watching her student with playful eyes. A good opportunity to throw Twilight into a new situation, and reinforce the bond between her and Arnon, to hopefully settle that nervous guilt that seemed to take her student any time they were close. And she had no doubt with how deeply Twilight would spiral into worry, she was probably quite tense, and could use the pampering.