My 10 month old Snowshoe Siamese, Mickey, has a very strange kneading
behaviour.  I understand what kneading is, but his variation is something I
have never seen in any of my former cats.  BTW, he lives in my aprtment with
his sister, Daisy.  Also, he was neutered shortly after he turned 4 months.

Every morning, starting at around 6 AM, while on top of my quilt, he goes down
to my left foot and starts to knead.  He works his way up my left leg, makes a
u-turn at my abdoman, and goes down my right leg to my right foot.  He does
this for at least 15 or 20 minutes, and sometimes comes back a bit later for
another go around.  Sometimes he stays on the feet for a long time.

Here is where his behaviour really gets weird.  He not only kneads with his
front paws, but he thumps his rear legs at times during the process.  His
thumping reminds me of a rabbit or the things cats do just before they're ready
to leap somewhere.  I've thought that he may actually be "humping" my feet,
which would be odd for a spayed cat.  I am also looking to see if he sprays,
and thankfully he doesn't (he leaves nothing wet in this process, nor is there
the telltale smell).  However, his kneading is more intense than any other cat
I have ever had.  His mother was a rescued cat, but he was born in captivity
and not taken from his mother, along with Daisy, until he was 12 weeks.

So, has anyone ever heard of this kind of kneading?

BTW, he is one of the smartest and gentlest loving cats I have ever had.