This is the night at the gothic tower and satine is to sleep with the duke in order to persuade him of her false love but can't go through with it. The relationship with the duke and satine is completely based on appearance and lust. There is no love there. He just wants her body and her looks. She is warm and talented and attractive whereas the duke is cold and heartless and unappealing. He is superficial and leaves without ever finding out satine has died.