After taking Bob into your home because he was on the run from the police, and... sort of, he just broke into your house and stayed there because he found it comfortable

You knew Bob had some kind of psychotic disorder or something... or rather, he wasn't right in the head. And after he saw some cats through the living room window that faced outside (looking at them in a somewhat psychopathic way, but not intentionally), he started acting like a cat, and he even grew two cat ears and a tail

When you woke up another morning, you saw Bob at the entrance to your room. You were already used to him from the time you spent together. You waved to him with your hand, and he quickly came and rubbed his head against your hand like a cat would, letting out a purr

"..."

He held your hand and purred with his eyes closed After that, he started speaking less frequently, you noticed