Si also explains that She doesn't want to feel his nose. It would be better off flattened so She has a more comfortable seat. Each time She sits Si is amused knowing the cartilage in his nose is just being molded by the pressure She's imposing on him.
Si also taunts him about his chastity predicament and makes him admit that his cock is useless. This is all so much more enjoyable for Her when She's able to not just physically break him down, but also mentally. He's degraded and made to feel like nothing more than the object that he is. That means his only value is being a seat and an ATM. The more he accepts that he has nothing else to offer the more smoothly everything will function!
