Spike sat up. The blood smears on his arms and groin had been washed away by Luna’s piss torrent, and he was now clean, though completely drenched and smelling strongly of urine.
He caressed his nuts. They were beginning to ache a bit from so many orgasms in such a short time. He looked over towards Luna, and noticed that Fluttershy had regained consciousness as well and rejoined the others. Her coat and mane was covered in blood stains, urine and semen, but she was smiling. The sight of her in this state aroused him greatly.

“Damn, I’m sick...” he thought to himself, grinning as his tool began to regain its stiffness. “So... who’s next?” he said.

“Oooh! Me! Me!” came an outburst from Pinkie Pie, bouncing happily up and down, making sloshing sounds as her hooves made contact with the puddle on the floor, which had now grown to cover almost half the room. The others turned around, giving her a disdainful stare. “Ahem. I mean... Shut up Spike!” she corrected herself, in an exaggeratedly stern voice, her smile contorting into a sheepish grin.

Spike could tell she was straining to keep herself from bursting into laughter. He couldn’t help smiling himself, thinking about how silly the whole thing was, and wondered what was coming up next. You just never knew what Pinkie Pie could come up with. She was just so random.
He’d never considered her particularly attractive, but now he realized she was really quite pretty, though her hyperactive bubbly personality tended to overshadow any romantically desirable traits she might have.

His mind returned to the present, and he turned to see the three ponies huddled together, whispering to one another. He tried, but couldn’t make out what they were saying. After a while, they turned to him, and Luna’s horn lit up. He felt the shackles around his feet come loose, then felt himself being lifted into the air by her telekinesis spell and held in place hovering just under the ceiling. The wooden mannequin was shoved into a corner by an invisible force, and a mechanical contraption of some sort moved in to take its place.

The peculiar device consisted of a battered wooden board attached to a sturdy looking metal frame by two large springs. He was moved over to the front of the wooden board, and shortly after shackles appeared from somewhere behind him and clicked in place around his wrists and ankles, before straightening out and holding him firmly in place.

In front of him, Pinkie Pie was lying on her back, while Fluttershy had begun tying her legs together with a thick rope. Another piece of rope was tied to the knot around Pinkie Pie’s legs, slipped through a pulley in the ceiling above, and attached to something behind him that he couldn’t see. A grinding noise could be heard from behind, as Pinkie Pie was slowly hoisted into the air until she was in front of him, her plot exactly on level with his wang. She looked rather helpless, dangling upside down in the air with all of her legs tied together, unable to move at all.
The sight of her pink furry slit in front of him made his soldier stand at full attention once more.
What happened next confused him.

Fluttershy, who was now standing next to the helplessly immobile Pinkie Pie, spoke in a sweetly cruel voice “You’re a failure, Pinkie Pie!”,
“Your parties suck!”, “Your friends don’t like you anymore!” she continued to spew out insults and demoralizing remarks. Tears were starting to well up in Pinkie Pie’s eyes. “Why don’t you run and cry to your mommy!” continued Fluttershy, a nasty grin on her face, as she leaned closer, staring Pinkie Pie directly in the eyes “Oh, that’s right... Your parents are DEAD!”. She emphasized the last word, nearly spitting it in Pinkie Pie’s face. Pinkie Pie was sobbing quietly, her eyes clenched shut, as tears trickled down her face. Fluttershy then leaned even closer, a grimace of disgust on her face, and spoke in a softly evil voice “You killed them...”.

At this point, two things happened.
One was that an icy chill traveled down Spike’s spine. The other was that Pinkie Pie screamed out, at the top of her lungs “NOOOOOO!!!”, opening her eyes wide as tears streamed down her face. Her pupils were constricted, and her face had an expression of infinite sorrow and rage.

Suddenly, she stopped sobbing, and a slight crooked smile appeared on her mouth. Her normally poofy hair deflated and fell down, hanging limply from her head towards the floor. “Yeah, well, I hate you guys!” she yelled. “Let me down! I’m gonna go hang out with my REAL friends!”. At the mention of her “real friends”, she gave a sudden twitch, and seemed to space out for a moment as her pupils slid eerily in different directions, before snapping out of it. She struggled trying to get free from the ropes, but to no avail. “If you don’t let me go now, I’ll kill you!” she screamed in rage at Fluttershy’s face.

A slight glow appeared around her, as Luna grabbed hold of her with a telekinesis spell. She struggled for a bit, trying to fight the spell’s grip, but resistance was futile. Her dangling body was maneuvered towards Spike, pushing her wet slit onto the tip of his cock, before the telekinesis spell was released. At the sensation of his penis entering her, Pinkie Pie went docile, and simply stared into the ceiling, a mad gleam in her eyes.

“Grab on to her flanks, Spike!” said Fluttershy. She now seemed to have snapped out of her evil mode, and returned to her previous sweet-but-stern “Mistress Shy” voice.
He did as she said, and placed his claws on Pinkie Pie’s flanks.
“Is everything ready?” she spoke up again, this time turning towards Luna, who had disappeared behind the contraption.

“YES, WE ARE READY TO BUCK!” came the reply in a loud reverberating voice.
A loud crash sounded from behind, and Spike almost got his breath knocked out of him as the wooden board shot forward, slamming him into Pinkie Pie’s plot with great force, and causing his cock to fully penetrate her. The board was immediately retracted by the springs attached to it, and pulled him back along with Pinkie Pie, who was muttering incoherently and drooling on the floor.

He felt a warm wetness spread across his cock, as she soiled herself, staring blankly at the ceiling. Her warm wet urine trickled down his balls and legs, and onto the floor, where they became one with the existing puddle. The delightful sensation of warm liquid flowing across his balls sent a wave of pleasure through his body.

Another crash sounded, and he was once again hammered into Pinkie Pie, causing the still flowing stream of pee to splash outwards, showering Fluttershy in yellow drops. “Oopsie! I tinkled!” said Pinkie Pie, giggling hysterically, still peeing.

Fluttershy was watching excitedly, her eyes widening at the action, as Luna repeatedly bucked the contraption, hammering Spike into Pinkie Pie. “Yes! Buck it harder!” said Fluttershy enthusiastically, hopping up and down in the puddle like a young filly playing in the rain.

With each buck, pleasure shot through Spike’s body like a lightning bolt, as his nutsack slapped wetly against Pinkie Pie’s rump, and drops of leftover urine dripped to the floor. He tightened his grip on Pinkie Pie’s flanks, as he could feel an orgasm coming on soon.

“Even harder!” yelled Fluttershy excitedly, standing on her hind legs with her wings outstretched and splashing the floor with her front hooves.

Another loud crash, and then the world went white. Or rather, the board broke free from the springs, slamming Spike into Pinkie Pie one last time, without restraint, causing the rope holding her body to snap, and hurling the two of them towards the other side of the room. Spike instinctively closed his eyes and prepared himself for the impact. A soft thud sounded, and he felt the weight of the wooden board pushing into him, still chained to his back. The final thrust of the board pushed him over the edge. It felt as though his balls exploded, as he fired a massive torrent of spooge into the deep, dark depths of Pinkie Pie’s inner sanctum.

He opened his eyes, but could see almost nothing, as the air was thick with a white fog of - he sniffed it - flour?
He tried to brush the flour off himself, but it was everywhere. He could barely make out Pinkie Pie lying limply on her back covered in flour, her legs still tied up.

“Are you allright?” he asked her.

She did not reply. Still unable to move, on account of his arms and legs being chained to a board, he gave her butt a bump by thrusting his hips. Regaining consciousness, she gave a loud moan, and he felt her pussy starting to convulse as she came too. As her orgasm subsided, she followed it up by wetting herself again. Spike once again felt the warmth of her piss flowing down his balls, and onto the floor, combining with the pile of flour and turning into a yellow muddy substance.
As he looked at Pinkie Pie, wondering if she was still alive, her mane and tail suddenly exploded back into their usual poofy shape, blasting his face with a cloud of flour.

She raised her head, and staring happily into his eyes, said “Whee! That was fun!” in her usual cheerful voice. Her face was completely covered in flour, and looked like that of a snow-pony.
She tried to roll around, but accomplished nothing other than smearing the mud-like mixture of piss and flour all over herself and Spike.

“A little help here?” she said to the room in general.

A knife, encompassed by a slight glow, hovered over to her legs and cut the rope tying them together. She turned herself around, and after pulling herself off Spike’s cock, stretched her legs outwards and shook her body, sending dollops of pissflour flying around the room.

Spike felt the shackles around his arms and legs being being released as well, and after pulling himself free, he pushed the board away from him, letting it tip over onto the messy floor with a loud splashing noise.
He tried to brush the flour off himself, but the stuff was everywhere, and the combination of sweat and Luna’s piss was turning it into glue on his body.