Eliza needs the lactation checks, and Dr. Killian Cresswell is the one who gives them. He tells her exactly what to do in the exam room. She obeys before she can think better of it. Each visit he asks for more than the last. She has never once said no.
The examinations stop being clinical well before she admits it. He draws the milk from her himself, and the guise of care thins each time. The interracial line he crosses gives her the belonging she has always craved. Discovery would cost her the guardianship of her niece, and she keeps going back.
He tells her the next appointment will ask for more than this one.