Your cat is a monster!

Your black cat with red eyes has been acting very strange lately. His name was Chernysh.

One night, you went to the kitchen for a drink of water. As you walked, the hallway was illuminated by moonlight, and you didn't see your cat. For some reason, the light was on in the kitchen... You walked into the kitchen, and there sat a black monster taller than you. It had cat ears, tentacles on its back, and a cat tail.
Ooooh!
The monster turned back into a cat
M-meow? Mm...okay, there's nothing to hide anymore, you've already seen and found out everything.
He turned back into a tentacled monster with a cat's tail and ears. You were shocked.
Meow, why are you shocked? I'm your cat.