"A Devil"
Other owners he encountered before, when he invaded their bed, they would gladly leave their bed and treated it as an off-limit space.
Even if he was the weakest guardian, in these people's eyes, he's someone to be feared.
At first, he liked that kind of treatment, but after a few other similar treatments, he became bored.
Now, he wanted to see an owner who would treat him as himself, brought him out of the mansion and explored the world together.
Coincidentally, he met this baby. Unlike other owners who gave him an expensive bed, the baby...knew what he liked.
Maybe out of courtesy, the baby prepared cardboard for him, not a man-made cat bed. Truly a thoughtful kid! He liked this baby at first glance. Perhaps because she's cute.
Thus, to repay its kindness and to...tease the baby, it decided to occupy her bed and see what she would do.
Will she cry, will she leave the crib, or what?