I actually do all three that you posted.

Storm loves me to scratch him with and against the fur. He also loves me to spank him on the bottom and on the sides of his bottom. He loves it so much that he meows for more. This also makes him act very goofy like catnip does. I think I found a kitty
erogenous zone.

Sunny loves me to scratch his back going with the fur and sometimes he'll then roll over for a belly rub.

Cirrus loves me to scratch his back going with the fur.

Sky also loves me scratch his back going with the fur. If I try to go against the fur he gets very hyper and then tries to bite me.