Several times today, I've noticed her giving him very slow eye blinks. I was curious, so looked it up on the Internet, and it turns out that's how cats say "I love you" to each other...or at least, "I like you enough not to attack you," which of course is important information in a cat's world.
I was thinking how sweet it is that they like each other already. Then I remembered that neither is fixed yet.
All of a sudden I feel like the mother of a teenage girl who has foolishly invited a teenage boy to stay for a while.