[As pleased as he was about what good he's doing for a change, Carlisle can't help the pause that question gives him.]

I- ah. No, not currently. My— [He rubs at the knot in his neck, his smile fading.] My latest student vanished only recently. I... haven't the heart yet to seek out another.

[And given how badly he took Atem's disappearance, he's not sure he will be putting out feelers for more.]