Get Used to It
As soon as you bring your rescue cat home, make sure you set up boundaries. For instance, don’t allow your cat to sleep on your bed. The moment you invite it into your bed, it’ll consider it its own. And there’s no such thing as sharing in the mind of a cat, at least sharing on its part.
This person created a short cartoon that shows the various sleeping positions of cats. The “chair” is when it cuddles up to your butt. The “straddle” is when the cat seeks warmth from your crotch area. When your cat starts doing the “push,” it’s pretty much game over for you. The last one means your cat owns you.