Mine is doing that and everytime he catches mde slipping and put his mouth on my fingers, my fingers go down his throat with a strong no. Then he gets something to chew on. Of course he still goes after my fingers but not as bad as he use too. He is 10 weeks right now but I refuse to let this go on. The more he keeps trying to get my fingers in his mouth the more he gets a finger down the throat. He gags, I stop then he smells and licks my fingers.
Then I grab a flirt pole or something to work on his prey drive so he knows this is acceptible and fingers are not.