Sometimes they just adopt a spot.

I swear that my kitty (which happens to be black and is the sweetest thing in the world) must talk to all the felines in my neighborhood through the window screen, telling them to come on over, the lady of this house is a S*U*C*K*E*R*

It's possible it was abandoned when someone moved & is returning to its home.

There is another thread currently discussing black cats. We are trying to bust the myth that black cats are bad luck etc. Afterall, they are just cats - black, white, orange - all deserving of our compassion.

Feed the cat.
Cats are smart animals and if one chooses you it is because it senses that you are a kind gentle family.

Black cat's being bad luck is just a hangover from the days of religious persecution.

I hear that a black cat crossing your path is bad luck, so is it triple, quadruple bad luck when a black cat makes your stoop one of his favorite places? We don't feed it nor chase it but the cat just seems perfectly at home there. Any local cat whisperer to determine why this cat has chosen our stoop and what life changing message he has for us?

Should I be wearing a garlic necklace or throwing salt over my shoulder at every turn?

Expert only advice please.