I know a cat sometimes comes through the window at night to eat the left overs from Her Mistyness.
This morning however I heard what I thought was her Mistyness asking for more food - went to tell her I'd already fed her and what do I see? I very large fluffy tabby asking for food - then deciding it didn't like seeing a hoomin and shot out the window.
Herself reacts in different ways - if I have been woken in the night by strange cat eating (NDN cat sometimes lets herself in) I have to prod her awake and she looks at me with a "hey that was a good dream, all the birds flew low and the mice ran slow" look and fails to see it.
If she does see it then she chases it off.
I don't think I'm adopted, the cats here seem quite sociable and get on with each other (at least at the front of the houses) I know her Mistyness is fed at two.
I can't really complain, one is my neighbour and his grandchildren love giving her milk, I did get them some cat milk and asked them not to give her cows milk so they now buy food for her.