Saber studied Illya's face and posture, finding not a single outward sign of fatigue or pain. As relieving as that was, it also made her wonder how her magic circuits were like to withstand her without breaking a sweat. She opted to not ask for now, wondering if her condition as magical girl helped to reduce the strain. There was not subset of magus as 'magical girl' in her experience to compare her attributes.

"I am," she told her, with a slight nod, "I feel closer to how I am like thanks to you." Just like happened with Rin, she had the fortune of choose a good Master. “What about you?” she asked immediately, glancing her up and down again to discern what she could have missed. "Was this experience strenuous for you, Illyasviel?"

She did not truly expect a fully sincere answer. The girl was too kind and would probably reassured her by claiming that nothing was wrong even if she felt a little exhausted. In the end, she was truly Shirou's sister and Irisviel's daughter.