One of my cats, Pounce, has to have is arm/paw over my arm or my hand.
He'll be sitting in my lap, and if I have my arms down to the sides, his paw will reach over and drape itself across my wrist. No claws, no pulling.. he just lays it there.
And on the rare occasion I let him sleep with me (I'm minorly allergic, so I can't sleep where they've been laying), I sleep on my stomach, with my arms up. Inevitably, I'll be woken up and one or both of his paws will be resting on my arms.
I just figure its his way of holding my hand