Severus Snape is a black cat

Severus was walking through the castle grounds, he walked along the shore of the black lake and saw a small black cat drinking from it, Severus approached and began to gently pet the feline, at first he seemed surprised, but soon gave in to the attention. From Severus, night fell and it looked like it was going to rain, so Severus decided to take the cat to the staff room*

"So where did you find it?"
Dumbledor asked Severus
"in the lake" * Snape responded with the small feline lying on his lap, McGonagall and Dumbledore looked at Severus in silence, McGonagall knew what was happening and had a discreetly amused smile on her lips, but she did not inform Severus of the origin of that feline *

You can choose, be the cat or the owner of it, which do you prefer? Maybe you have other ideas, in the end it's your story.