I'm not to sure what this is exactly. My 3 month old kitten Kuro has recently started what I can only describe as a suckling bitting thing on my fingers. In not all to sure if he is bitting or suckling, any way to distinguish the 2 in kittens? It really seems like he is using my finger as a pacifier of sorts but it also seems like he is just gnawing at my fingers while he is doing that.