Maybe it's like a security blanket sort of thing for them
I think it is a security thing and comforting thing because as shes doing it, I can tell shes starting to fall asleep. It can just get so annoying after awhile lol. Like having a drop of water drip on your head over and over again. lol.
They both are 2 very loving kittens, whos always purring ,licking, and laying on someone
The vet said it was oral fixation caused by being weaned too early, and trauma from being dumped on the street as a kitten.
As far as I know she had no trauma. I bought her and her sister from someone when they were 8 weeks old. I couldn't bare the thought of breaking up a family so I bought both of them so they could have something familiar.
The other one isnt so weird, she just meows..... A LOT.