My 12 week old cat is pure evil.

When I pet him he gets super happy an he is always so excited to be near me (he always comes to sleep in my bed when I go to sleep it's so awesome) but then as I'm petting him sometimes he will try to EAT my fingers AND hand. something something don't bite the hand that feeds you. He is so happy when he is trying to eat my hand and fingers. In fact as I'm typing this he is trying to eat them.