Iruka made sure that everything Itachi needed, including a bucket to be sick into if it came to that, was within reach come morning, brushed his hair back, then set out to go teach class for the day after a thorough shower. He came back at lunch to peek in on him, but otherwise didn't return until that evening to come in and see how he was doing properly, reaching to touch his face and see what he'd done to the stuff around him.