I've seen mojo do this before, but I'd not given it much notice...when you excercise a guardian on your slave-masters comforter....youd best be looking for just one thing...pre-cloacal contractions!
Anyway, Ive done this w/ a number of serpents over the years & never noted this...
Mojo appears to actually enjoy the smooth texture & undulates slowly & rythmically [ala colubrid courting rubbing]& really doesnt go anywhere. This is clearly not merely losing traction as he has moved quite quickly on the same comforter.
Guardians are quite amazing when we allow them to be.
BTW....Happy Birthday America
Mas Cervezas....rr

