They're aware Frisk is talking, and they're trying to listen because there may be a test later so to speak, but most of their focus is going to keeping their breathing somewhat calm, with... shaky success. It sounds like a modulated drone, although some of the tone slips through now and again.

It's gentle, but it's their head. Their enjoyment of touch is pretty much nil everywhere, but that's one of the places it extremely goes into the negatives. It's so, so easy, for a fistful of hair to be taken and pulled...

"Yes," they say, and desperately hope that's relevant to what's being said. The tone was... apologetic? They swallow and try again - "There is no need to apologize." - and only realise after the fact that they've only repeated themself.