If a talking cat was a surprise to some people, Sans was not one of them. He knew a cat, after all. Granted, it was a purple cat with streaks in her hair and with an alligator for a best friend, but the general principle was the same.

Of course, her being a monster is ruled out right away. Even the youngest monsters know about magic.

"Oh, I'm a reverse human. I wear my skin on the outside. Keeps it nice and toasty."