Iona Grace is an unrepentant slut. It is just who she is. There is no cure for wanting her holes filled 24/7 except to have that wish fulfill. As soon as she is empty, though, she is like an addict looking for her next fix. She will do anything if it means getting another cock in her. Since PD is in control she is going to have to work extra hard if she wants her reward. Hard enough to make him want to fuck her more than he wants to hurt her.