Lucius carefully watched his son's face as he reached for an answer to his mother's question. Draco was doing a fair job of pretending as if the food in his mouth was the reason for the pause, however, his eyes casing around gave him away. But whatever he saw, it clued him into when he was and he was able to answer the question specifically. Which was always a bit of a relief.
Draco's time with his therapist actually seemed to be helping, if not regain his memory, at least he was being given tools to help him navigate the world without needing quite so much supervision. Though he had never been in therapy himself and generally regarded it as pretentious nonsense, he understood that what went on in the sessions was private, but that didn't keep him from needing to know what was said in the room. Especially since he assumed a great deal of it was about him.
"How are you getting along with that? Do you think continuing is still necessary?" This question did not mean that Lucius thought Draco should suspend therapy, it was merely a way in.