When she began to talk in earnest, Harry gave her his undivided attention. He locked eyes with her for a moment, but shifted his own gaze away before it could pull him into a soulgaze, looking at her chin instead. When she had finished speaking, Harry explained, how voice soft.
"You don't want to look into my eyes too long, Ms. Romani. I don't know if anyone has ever told you, but you don't look into the eyes of a wizard. For us, the eyes are quite literally windows to the soul."
That said, warning given, he went over what she had told him. "Does it need to be living blood?" he asked, the same way he would address a delicate question with any of his clients. "Or would a supply on standby be sufficient? You know... in case of any emergencies?"
It was, after all, emergencies that he needed to be ready for. He had no doubt that she had learned how to sustain herself over time.