Why does my son do this?

My son is 4 and loves to touch things with his feet. He always has. He likes to put his feet ON people too, he says it feels good and is warm. One thing he does when he is relaxing is scoot over to me and put his feet on my bare skin like my leg and open and close his toes on me. It seems to soothe him. He will do it and sometimes fall asleep.

Why does he do this? I’ve never ever seen a child do this before.