"Corn Cobbing" is the perfect name for the nibbling. Cash did it to me for the first time the other day and I thought my perfect boy was trying to nibble my fingers off and I yanked my hand back ( did not yell at him ) but it scared him more than me. My wife laughed her head off and said that he has done that to her for over a year and she just didn't tell me, cause it was a special affection between her and him. Now he does it all the time to me and usually follows up with the heavy head and a sigh. Seems very content with the world.