For some reason this isn't all that surprising to Cuthbert, but it's only because half of him thinks it's Karkat manipulating the situation to their advantage. After all, Bert can't read the note for himself to know. But he's grateful enough for the medication that he's not even going to question it.

Kissing means he'll have to stop singing, but the dokidokis are still tearing up the one he injured earlier so it's the best opportunity they're going to get. He takes hold of Karkat's face again, trying to be gentle with the injured part and gives him a surprisingly genuine kiss.