Rarity flashes her horn and a large wooden armoire starts to rumble as her magic searches for what she's looking for.

"Oh, I simply need something like this during such a stressful project. Fleur isn't always the most hospitable client, but the checks certainly are good." she says to herself, as she lets out a happy "ah!" as the thing she was looking for comes bursting out of the cabinet.

It was a large purple cylinder with two open ends and a stretched out inside. On the end was a little ridge where she would put a condom. Her magic started to rumble as she brings a large condom out of that same cabinet and unwraps it. The black wrapper states "perfect for cock vore and/or overproductive packages!". She takes the black condom out and slides it over the end of the tube so she can be sure you'll have the easiest time reforming. Also because black goes with anything. She brings the large masturbatory aid under her desk and makes a quick phone call to the office secretary, Raven. "Raven, darling, please call Twilight and tell her to come over. Tell her I'll need some help with some "animation"." Rarity had done this enough times to various ponies and helpers that Twilight knew what it meant.

With that out of the way, Rarity holds her breath and pushes down. The slick interior of the sex toy glides over her turgid flesh, and she gasps at how tight it feels. The pink silicone squishes and makes all kinds of noises as the horsecock slides in and stretches it out. She bottoms out in one stroke, not limited by pesky bodily organs or physics. She can almost see her tip exiting the toy but the opaqueness of the condom prevents that.

"Well, dear. It shouldn't be long now. Doing this always gives me a hair trigger." She starts to pump, her hips moving back and forth as her magic works the opposite way. If you could feel anything, it would feel like a rapid swing set as her enormous and gurgling testicles swayed back and forth, nearly hitting the carpet in her office and giving her delicate balls rug burn. A vicious "smack, smeck, smack" reverberates throughout her office, and anyone within a few meters of her office would surely be able to hear her pleasure herself.

She keeps going, faster and faster, pumping in and out of the sex toy like a mare in heat, making sure to stay in so the load can go into the latex container. She finally starts to pace herself as her pistoning comes to a finale as she gets more determined and particular with her pounding. "Almost...there...just...a...little..." and as soon as she was about to finish her sentence, the dam erupts.

"MOOOOOOOORRREEE!" She screams as all hell breaks loose. The first shot sends the tip of the condom out like a cannonball, the thick cream starting to bulge the latex with every pump as she thrusts her hips out every time a new rope shoots out. It keeps coming, volley after volley of musky, voluminous jizz. The condom starts to look like a massive water balloon as it flows like whitewater (heh) rapids. After a solid minute of pleasure, her massive junk has shrunk back to a (still) large, but more normal size as all of you has been ejected. As Rarity wipes away stray strands of her purple mane from her sweating forehead, a pink flash appears as a familiar alicorn teleports in.

"So who was it this time?" Twilight chuckles as Rarity catches her breath.

"My assistant..." Rarity grumbles as she moves the toy away from her and ties off the condom.

"Can you just let them know if your junk is going to devour them? I swear this happens like once a week."

"His tongue is just so good darling, you should give him a try!"

"Only if he consents. I don't want this happening again."

"Fair. Just bring him back, please, I'll get the setup ready. " Rarity walks over to another cabinet and gets out a large plastic kiddie pool as she levitates the wobbling condom over and into it.

Twilight's horn glows a bright pink and a flash of white overtakes the office. Now inside the kiddie pool is a dazed and confused human, and you move your hands over your body, suddenly aware of your form.

Rarity runs over to you and hugs you, "Oh, I'm so sorry dear, I should have let you know."

"It's okay," you say, "it was kinda fun. I would like a heads-up next time, though."

"Absolutely, I should at least give you that much. Is there anything I can get you now?

"Yeah. A raise." All 3 of you in the room laugh loudly, and as the laughter dies you pipe up again. "No, I'm serious. I'd like a raise."

Rarity replies flatly, "Oh, yeah. I can do that."

Author's Note

You got a raise, Rarity found a new sex friend, and it all ended fairly well.