Go into the art gallery, but don't let her cum

The two of you head into the art gallery. You want to let Carrie calm down a little so that you can play with her longer, make her really ****. She drags her feet as you walk, making it obvious that she's trying not to cum. You grin to yourself. When you reach an empty room, you sit down on the ottoman meant for visitors to sit on as they view the installation.

Carrie sits down beside you and the two of you gaze at the artwork in silence for a minute, until you can sense that she's not on the edge anymore. Then, you lean over and whisper in her ear with a smirk, "That was a close call. You almost embarrassed yourself on the street." She breathes deeply as she leans into you, her heart pounding, before she whispers back, barely audible, "I'm so pathetic. I seriously almost came in my panties in the middle of the street."
"I want you to take off your panties," you whisper as you caress her soft thigh.
"Here?" she asks.
"We're alone in here," you remind her, "Nobody can see us." You slide your hand up her thigh, enjoying the shiver it sends through her body.

She shifts in her seat as she wriggles out of her panties before sliding them down her legs. She hands them to you. There is a large wet spot from precum. You hold her panties to your mouth and nose for a moment before stuffing them into your pocket. You kiss her neck.
"You like it when I tell you what to do," you observe. She lets out a little moan. You kiss her deeply, letting your hands grope her body but managing to keep yourself from reaching up her skirt and playing with her eager clit. She rubs her hand along the hard length of your dildo, which remains trapped in the front of your jeans. It's not long before you can tell she's approaching the edge. As her body grows tense and her breath escapes her in telltale little gasps, you abruptly stand up, straightening yourself as you head towards the exit.
"What are you doing?" she asks, alarmed.
"You didn't think you were going to get to cum yet, did you?" you say teasingly, "We're heading back out."

She nervously follows you, clearly struggling not to cum. You hold her hand as the two of you step back into the streets. She's using the same cautious gait as before, as though any movement could set her off. Now, though, it's more intense.
"Are we going to uh, go somewhere private soon?" she asks desperately, "Like, really soon?"
"Why would we do that?" you ask slyly, as though it isn't obvious.
"There's precum running down my thighs," she confesses, blushing, "And I'm really close to cumming."
"Well, you're just going to have to hold it," you murmur with a smirk, "After all, we can't have you cumming all over yourself in the middle of the street, can we?" She gasps in response, clearly struggling not to cum.

"Please," she begs, "let's go inside somewhere. Somewhere close. I need to cum." Her voice is a cute little whine. You laugh.
"We will," you say, "but I decide when and where. You'll just have to hold it until then. Surely you can do that, right?"