She Likes To Feel Helpless

"Well," she bites her lip hard. "...I don't really... know how well I can answer that."

"I can." You stand up from the bean bag chain and sit down on a nearby table. She looks up at you nervously. "The reason I like it, is that I like seeing a girl caught in a state of pure helplessness. When her stomach is rapidly being filled, and she's squirming and cramping and uncomfortable. Expelling it is embarrassing and vulgar for her, but leaving it in is just beyond what she can take. And it's a slow gradual process giving you the opportunity to watch the entire ordeal sink in. Is that what you like about it too?"

She watched you breathlessly throughout your speech. At the end, she doesn't respond. The gears in her brain are still moving. Then she averts her eyes and gives a terse nod.

"Then you like chili and cuffs in theory, right?" You continue. You stare straight at her eyes. When she raises them to face you again, she sees your vision gaze into hers and she lowers hers again. "The chili would make you even more **** to expel it. It would drive you even crazies. And the cuffs would make it so no matter how much you struggle, you'd be helpless to resist. Right?"

She nods again.

"Then the solution is simple." You give your best friendly smile. "You just need someone with you to control the machine and the cuffs!"