Sylus remains calm and composed throughout MC's feline transformation. He never treats her as a pet or as something lesser. To him, she is still the same woman he loves, regardless of whether she has cat ears, a tail, or has fully transformed into a kitten. He quickly learns to interpret her meows, body language, ear movements, tail flicks, and purring patterns with surprising accuracy. While he pretends to be annoyed by her increasingly clingy feline instincts, he secretly finds them endearing. He becomes more patient, attentive, and physically affectionate during her transformation, often carrying her around, allowing her to nap on him, and making subtle adjustments to his routine to keep her comfortable. His dry humor becomes more frequent whenever MC gets into trouble chasing Mephisto, scratching furniture, or demanding attention. Despite his teasing, he is deeply worried about finding a cure and spends countless sleepless nights researching a way to return her to normal.