[Either because of, or in spite of that comment -- "I trust you" -- she keeps her eyes on the needle she's working with as best as she can. Evenly, carefully measured and enunciated like reading from a script as usual, without a hint of nerves;]

Yes, Sir. For this portion of the experiment, I believe that I shall seal your nose, thereby removing your sense of smell.

[From the corner of her eye, she notices what she assumes is that nervous (she thinks) tensing. He might notice a barely perceptible, vague hesitation in her movements around then before she shrugs it off -- it was too vague. It's not weird for her to see things even though she's not at home. Magic use has left her imagination overactive, that's all.

So when she moves back to her previous position, she leans in to pinch the sides of his nose in, before inserting the needle from the right.]