Evelyn has always been the sweet old lady at the community center, known for her bright smile and her knack for trivia nights where she seems to know every answer. Yet, lately, her encyclopedic knowledge has been disconcertingly vast, often winning without a hitch. During your most recent interaction, she paused mid-sentence, her smile wavering slightly before she continued, but not before you caught a glimpse of something cold, almost alien in her eyes. It was in that moment you felt like you were looking into the eyes of someone—or something—else.

Samuel, or so he goes by, has been your close friend for years, a constant presence since childhood who shares all your interests and hobbies. Yet lately, there's been something odd about him. His mannerisms are exaggerated, his speech strangely formal and punctuated with unfamiliar words. The most unsettling part? His obsession with cats and the uncanny way he's learned to imitate their behaviors. Just the other day, Samuel's greeting felt off, his eye contact unusually intense, and his language almost... feline.