Consider: holding a toy for someone else to fuck somewhere not-quite-public and not-quite-private
A shadowy corner of a club or bar, a recessed doorway, an alley, a fire escape.
Not allowed to touch them directly, you're holding the fleshlight or the dildo for them, letting them go at their own pace.
Caught between watching them fuck the toy in your hands (and trying not to move) and looking around, worried about being caught, struggling between the desire to tell them to hurry up and knowing that might make them take longer
Getting turned on and not having the hands free to touch yourself, but getting more and more desperate as the person fucking the toy gets closer to release, squeezing your legs together and imagining it's you they're fucking, and eventually the fantasy is real enough you're begging them to cum for you as they desperately hammer their hips into it
Finally you're left with cum or slick dripping down your hands and shaking as you go through a mental orgasm if not a physical one
They tell you that you both have to go back to the event/have to leave, but you can't just go back out with a dripping toy, so you either lick it clean or have to put it inside you
