This optical illusion of a hand going through a cat seems nearly impossible or even Photoshopped. However, the hand of the lady simply passes under the right armpit of the cat, and due to his chonkiness and a lot of fur, her wrist got covered up.
We all know that cats are liquid and this one must be hanging over the arm quite a bit. A Reddit regular DEIVIUX90 has drawn an explanation, in case you really cannot see what is going on with the hand through a cat.