"Coming!" You shouted, "I'll just be a minute!"
You hobble upstairs as best as you can, but it takes a bit of time and more than a little caution, considering even the slightest motion starts agitating your oversized labia, which is so puffy it's nearly lower than your belly! You have to hold your tail up as well, the feeling of the individual hairs tickling it was too much for you. You take a deep breath and spread your legs a bit further, the light breeze is tough to cope with, but it's easier on your cooch than the friction from your legs.
Finally, after what feels like a mile of walking, you've made it up the steps to Pinkie Pie's room. Her door is shut, so you give it a quick knock.
"Just a miiiinute!"
You hear a clattering, a thumping, and what sounds like a power drill. Finally the door swings open and Pinkie is standing there, smiling. Without warning, or respect for your personal space, Pinkie cranes her neck around back of you to examine your now-swollen assets, and smiles even wider. Did she know? Wait, she gave you that pastry, of course she knows!
"Ooh goodie! Your tushy's ready for the pushy!"
You can't help but cock an eyebrow at her. She covers her mouth and giggles, before sidestepping so you could have a good look at the inside of her room. Your jaw drops when you see what she was preparing for you. Sitting in the center of the room is a monstrous machine the likes of which you've never imagined, even in your wettest dreams.
You walk closer to get a good look at it, it looks like a tree trunk just about your height made of black latex, ribbed and covered in realistic looking dimples and wrinkles. It must have been molded from a real cock, but you couldn't imagine what kind of beast would need an attachment this big. The base of it is some kind of giant hydraulic device, your pussy starts to lubricate just by thinking of how much "horsepower" is behind this thing. And on top of that it's stuck to the ground with heavy duty suction cups, you imagine that it must give a hell of a rough ride.
"Hey!" Pinkie suddenly appears behind you, and you cling to the dildo in shock, "Wanna hop aboard? The other girls are gonna be here in a bit, but you were gonna get first turn anyhow!"
You stutter to say something, blushing. But Pinkie just laughs again,
"Oh, don't be shy little Miss Orange. After eating that DP Doughnut there's not a stallion alive who could pleasure you, you NEED this."
"Uh," You weakly nod, she was right, you needed this. Pinkie puts her hooves underneath you and helps you up on top of the device. You place your opening on the tip, but are too cautious to lower yourself onto it.
"So Pinkie," You call down to her, "How do I work this thi-aaaugh!"
Your only answer is the sound of a diesel engine revving up. That little stinker turned this thing on you! Completely unprepared, you slip and fall down onto it, sliding down until your butt is nearly on the floor. You look up, and see your own gut stretched like a grotesque rubber glove, or more appropriate, like an oversized condom! The device pumps upward and pulls you off the ground, before slowly easing back down. Before you can catch your breath, the machine thrusts you skyward again. Pinkie, meanwhile, is watching her insane machine fuck you senseless and laughing her head off. You'd be more upset about her vouyerism, but you're too busy being fucked like you never were before. Your dripping wet cunt is literally stretched above your head.
"Ooouah! Uuuyeah!" You scream in between the thrusts of the piston, "More! Mooar! Sweet Celestiaaaa more!"
Pinkie nods, "If it's more you want, it's more you'll get!"
Her hoof presses against a dial, reading the settings, "Filly fooler", "Caramel", "Big MacIntosh", "Discord", "Princess Molestia"...
"Hmm," She ponders a moment, before deciding to turn the dial to the furthest setting, "Snails."
The machine whirrs and kicks into overdrive, pumping much faster, although in shorter thrusts. The mere vibration from this cunt destroying monster would have blown your mind, had you been the mare you were this morning, but now, oh no. It's barely enough to slake your lust. You wrap your hooves about it and buck, your screams coming out in a spectacular vibrato thanks to the speed of the machine.
"Hold still missy," You feel a pair of hooves on your cheek, Pinkie's spreading your plump ass apart. She sniffs the musty aroma, before bringing her wet little tongue up against it. Just that slight touch sends gushes of pleasure through you, resonating on the same frequency as that almighty dildo, doubling your pleasure. She starts getting especially frisky now, pressing her muzzle up against your oversized anus. You screams are more like moans now, as Pinkie starts stuffing her whole nose inside your butthole. But she doesn't stop there.
"P-pinkie? Nng, what do you think you're dooooing?"
"Mmph haammphf" She pulls her nose out of your butt with a wet pop, "I said I'm taking care of your butt! Can't be snooty when it comes to your booty! Now hold still sweetcheeks!"
She goes back to slurping away at your ass, then the inside of your ass, and then,
"Sweet Celestia!"
Is all you can exclaim as you feel Pinkie's entire head jam it's way inside of your puffy anus. You scream out in agony and delight, as Pinkie begins bobbing her head in and out of your ass. She's a living buttplug!
All of this at once is overloading your mind, you can hardly hear yourself scream against all this mind shattering sex. You... you...