Unpredictable Cat

My daughters cat is a wild, aggressive, chancer and a neighbourhood character. He has never been nice to my other half, ever. This morning, his usual yowling at the window, followed by his usual nonchalant entrance took a surprising turn . For the first time ever, he jumped onto the bed, kneaded the duvet, slowly crept up to my significant other and softly kissed her. I'm not sure if she was terrified or just utterly gobsmacked, but he then proceeded to settle at her feet, wash himself and take a catnap. She was expecting to be mauled, which is his usual routine.