" Each time, she noticed his eyes, luminous and slit-pupiled—each time, he expected her to be frightened, but she was only ever curious. When she got old enough, she would ask him, "Why do you have cat eyes?" He got to try out plenty of responses.
"I traded them with my cat. Now he has human eyes."
"The better to see you with, my dear."
"Why do you not have cat eyes? "

― Cassandra Clare , The Lost Book of the White (The Eldest Curses, #2)