Cherry Torn wanted it so badly she was going to do it to herself, so when PD found her already trying to tie herself up, really he was just giving her a hand. If that hand came with a cock and cane, where is the harm in that? She loves the feeling of being penetrated. It makes her feel useful and worthwhile. When she is bound it makes her feel safe and controlled. When she is struck it lets her know that he is strong and brings order to her life. She wants those feelings. She needs them to survive. And PD is more than willing to provide them all in excess.