Here's an idea I've been thinking about using in a story. Or for that mater even doing if I had the chance.

Get one of those insertable toys with a remote. Have her wear it out to dinner. (This probably takes some kind of harness to keep it secure for the evening.)

We go out to dinner. Somewhere nice, or at least nice-ish lol. I buzz her every once in a while, for different amounts of time. If this toy had various intensity settings that would be much more fun. I make a point of having her cum in public at least once.

So we get in the car, and I give her a choice: I turn this thing onto a medium setting and leave it there until we get home, and I will give you a present when we get back. Or don't have it on and get no reward.

Naturally, she chooses to have it on.

So I turn it on, and leave it on, and we start driving. In a couple minutes, it occurs to her... we don't seem to be heading home. She inquires. That's when I say with a smirk:

"Oh, didn't I mention it? We're going out dancing."