The oil makes the ride into Belle's mouth extra fast.  Along with some of the rice, the cat lands onto a soft, wet surface.  He's on the cow's saliva-coated tongue as the rice continues to ran into the mouth.  The slick oil is washed out by Belle's thick, sticky drool.  He rolls to the back of the tongue as saliva and bits of rice get stuck in his fur.  Wiping the spit off his face, Tozoku tries to get back to the front of her mouth, only to slip and fall on Belle's tongue with a wet splash every time.