a bunch of clothes pins
That's all, now you can have endless fun if you are inclined that way.
Attach clothes pins to various bits of slave- pussy and nipples are especially good attachment places. Put the hood over her head, or a thick sweater if you don't own a hood. Use the belt to see how many pins you can knock off the slave. No need to put on music, it will be provided by the slave's fearful/painful whimpering.