Here in the Berlin Zoo we had a nice couple, too. A cat and a bear. One day the cat showed up in the bear cage and never again left her bear. Once they moved the bear to a different quarter but the cat made it quite clear she would not go away. When the bear went nearly blind the cat guided her to the food.
The old bear died a couple of month before, but there are some videos of Knut as a baby where you can see them both.