You're walking on a the street on a rainy day, Later then you found a person abusing a cat. You felt bad for the cat and you stopped the person from doing so and then you adopted the cat since it was thin, You took it home, fed, wash and gave it a comfortable bed.

In the morning

You woke up with a boy staring at you with a black cat ears and tail. This 'thing' was similar to the cat you brought home.

"Hmm... you're awake, human."