My cat Tweaker does that all the time.  I interpret it as playful
behavior.

Charlie

DOes he lick too? Usually is a grooming thing.

He's answering the call of his long-past nursing instinct, more than
likely. It somehow comports him to do this. I don't know why. Ours
doesn't nibble on me, but he used to with my wife. It would come by way
of a nightly ritual. First, he would slink up to her while she would be
sitting on the floor in our beanbag furniture. Then, if she didn't
protest by crossing her arms or moving up her legs, he would race up
her front and nestle in her chest area and then start suckling a mole
on her neck. No sh.t! I put a stop to that behavior in a hurry. It went
on week after week, and it made me sick. It was like he was using my
wife to masturbate on or something. Totally disgusting, and by that
time in his life, totally unnecessary. I would always scold him into
retreat by telling him that "big boys don't nurse", while at the same
time, shaking a finger wildly in his direction. It finally worked. The
only problem now is, he has substituted another ritual for the old one.
Now, he waits for me to come into the hobby room and sit down at the
computer... then he waits at the foot of the bed for me to call him up
by patting the covers. And when I do, he bounds up on the bed and
quickly nestles into his precious fleece blankey. He immediately begins
the kneading of the paws ritual. Next, he valiantly attempts to find a
ninny ... his little head with nose and mouth pressed hard against the
fleece, he vainly searches for something way back there in his little
memory somewhere, he knows not what. Then he simply keeps a kneading
motion to 'keep the milk coming' so-to-speak, and proceeds to slobber
on the fleece for ten minutes or so. After that, he roles onto his back
and crashes. This goes on every day. He still nestles in my wife's
hair, but he will no longer obey the nursing urge, which I have seen
with my own eyes. The wife says I taught him well, since she says he
won't even try it when I'm not there anymore. Smart little f.cker. But
I am smarter!
I think that this is precisely what your kat George is doing, except
he's using you as a ninny. My advice is to wean him off this improper
behavior immediately. Let him know that it is unacceptable. That is of
course, unless you yourself like it. Then I'd have to say that you are
a grosser SOB than he is. At least he stands under the banner of a
lower animal. You are a person, and you shouldn't like such things done
to you by a beast. Kitties are very sensual creatures who have their
own secret little fetishes and so-forth. But that doesn't give you the
right to issue him an open invitation to do vile debaucheries on you or
anything.
Oh... a word of warning.. Don't listen to the women who you will meet
in here. They are the kind of females who would still be allowing their
teenage children to nurse off of them if it were allowed by society.
Listen to ME.  Although something tells me that with a name like
peace-frog, you're already one of them. If so, welcome abroad. Now..
you know right where you should go next.  Capiesh...??
Just my take on things. I hope this helps with the George problem.

                               IBen

Two of my cats do this. The Siamese mix will give little kisses then proceed
to clean me.  The older tom cat I will sometimes wake up and find he is
grooming my hair or is mouthing my rings.  He has this thing for my diamonds
so at night I slip them around the inside of my hand since I've woke up and
found him chewing on them.

Celeste

Bonding.  He's mimicing behavior he would normally reserve for his mate
or littermates.  He wuvs you!

-L.