We have a kitten that we took in because he had been abandoned.  He loves to
be held, and is old enough to jump in my lap.  This isn't a big problem,
even though I work from home and he sometimes makes it difficult to get any
work done.  But half the time once he's in my lap, he starts attacking my
hands, and he's not gentle about it.  I have claw and teeth marks all over
my hands from this, and I can't figure out how to get him to stop doing it.
He also likes to bite my chin.  Is this something he will eventually
outgrow, or is there something I should be doing to convince him that this
is not something I like?