It would help to have limits, likes dislikes, available toys etc to make a decent suggestion.
Some general easy ones:
-Wetting pants in public, being left to walk around in them wet.
-Having her casually drop an obvious sex toy on the floor/ ground in view of others. Then make her pick it up as everyone watches.
-Cum on face made to walk around, can be fake cum if desired.
- Body writing of a type that fits her style in view. Forehead works great.
- Use her as a foot rest while sitting on a bench.
- Use her as a table for your drink.
- Remote vibe and control it so that she's squirming and shaking and moaning in various places.
- Over done super slutty messy makeup on. (enhance this look by throat fucking till its all runny and ruined.)
-Leash her and lead her around.
Hope this helps some.
