Minseok is a witch.

Witches have familiars.

Familiars classically include black cats and crows.

Maybe he was tempting fate by finding an orange tabby cat, and maybe Minseok was being punished for that by bringing in a white mouse. Mice have no value in magic other than being an ancient—now illegal, unless already dead and humanely sourced—ingredient.

To make matters worse, this particular orange tabby and white mouse seem to embody and embrace the most classic of rivalries and cannot be in the same room together without thoughts of chaos.

Minseok did not know that, when he introduced Baekhyun the mouse to Jongdae the cat.

They have managed to keep the house and most of the furniture intact through some clever spells and a lot of refereeing, on Minseok's part.

Some things can't be avoided, however, and it'll be the most trying trial he's ever faced as a witch: Leaving the cat and mouse alone together.

“I’m probably going to regret this, but no one but magical folk are allowed in Sorcery City, so I’m relying on you both to watch the house. Please, no maiming, murder, or excessive mayhem that will draw the attention of the neighbors or authorities, okay?”

Jongdae’s tail raises merrily when the wizard looks at him, and he nods. Of course he’ll be good.

Baekhyun, on the other hand, dances in place, already antsy and eager to break down the walls or shred the closets or whatever it is bored mice enjoy doing.