We once went out to buy a new riding crop and did of course go to a quite fine "horse" stuff shop and selected a very nice one. I made her bend over, lifted up her skirt- she's pantiless of course and gave just one stroke, asked if it's good, which it was turned to the very surprised, her jaw was on the floor, cashier, and bought it.
Make a nice breast bondage and let her wear a tanktop or similar that shows it.
Slutty or very misplaced clothes or all to young for her age.
Lead her around in a collar and a leash, maybe combined with the hands cuffed together.
Using a remote controlled dildo and enjoy her reactions when you turn it on.
Using butt- plug and dildo at the same time. Gives a very nice gait.
Else just use your imagination and remember to stay inside the subs limitations.