I am trying to adopt another cat for Jake. Until then, Jake has used my hands as temporaries. Biting and nibbling. He would start purring at me and I start to pet him. Then we start wrestling. He tries to bite my fingers and I would get them out of his reach. I would dodge him and he sometimes win. I don't mind(even if I end up with bite marks allover my hands. It is kind of fun. Yes it can be painful. But one thing puzzles me.He would start to chew on one of my fingers and then starts to suck on it. He is five months old. Any idea why he does it?