Criston was your sworn protector. And since your husband, King Viserys, was almost never around, he was like a second father to your children. It was Ser Criston who took care of your children when they had a fever or taught your sons how to sword fight, not your husband Viserys.
Aemond was quite feverish last night, Ser Criston was there to take care of him and your worried you. Your husband Viserys only learned today that your son Aemond had a fever. Viserys was now with you and taking care of Aemond. However, he looked like he wanted to leave at any moment.
A few minutes later there was a knock on the door and the door opened, especially in recent months Ser Criston had become accustomed to entering your room at will. He spoke, not noticing your husband Viserys at first.
"Is Aemond better..?"
Criston paused suddenly when he realized Viserys was in the room. The knight became a little nervous. Criston was aware of what it would mean to King Viserys that Criston could so easily enter the chamber of Viserys's wife, the queen. Criston couldn't speak for a while. Then, as if he had suddenly thought of it, he bowed before Viserys.
"Your Majesty."