I have been worried about nothing.
I thought it might be a problem to have mr. Maulus as a guest. Not because of assassins, that is nothing we cannot handle. But, I was worried about the reaction of my cat Mittens. Would she allow an intruder in her domain? Share food? And would mr. Maulus feel at home, or would he try to escape through the cat-flap in the door? Should I lock the cat-flap?
It turned out to be no problem, they hit it off right away. They even share the red blanket - the one that I am not allowed to use when Mittens decides to install herself on it for a nap.
Hopefully they will not synergize on mischief.