It could be all sorts of reasons.. I had a cat when I was young that would treat me like her "kitten". Licking and purring away when I was crying or upset. They say animals sence thing we can't.. so it might be just that he feels you need some extra attention! LOL another way I have used to break bad habets with animals is kind of treat them like children.. when they do something you don't like for attention. When he jumps up in your lap and starts licking.. set him down and stand up. If he doesn't lick then he can stay. That sort of thing! lol good luck!