I Became the Pet Cat of the Villain Family

Why do villains always have cats? Villains were usually rich, and their cats always lazed around. I was sometimes envious of such a cat's life. But why am I a cat? Suddenly, I became the pet cat of a villainous family in a novel! I struggle to save my young butler, who is destined to be beheaded as a traitor in the original story, but my cat life is not as smooth as I thought... No matter what, I will protect my butler! Anyone who messes with my butler is going to regret it!