Twilight waited for Rarity to recover from her "inspection". Rarity was still shivering from the experience. It had been a few moons since her last intimate experience, and it hadn't involved such attention to her rear end. She made a note to try it more in the future.
Twilight turned to Rarity. "Are you ready to start, Rarity?"
Rarity sighed. "I guess so. The sooner we begin, the sooner this is over? Let's get started."
Twilight nodded and lit up her horn. With a purple flash, the two ponies were teleported to spacious room, padded with yellow insulation. The room was pretty bare, only containing a work desk with a console on the table, and a purple, two seat couch.
"Where are we?" Rarity inquired.
"We're still inside the castle, on one of the bottom floors. I figured this would be the most private place in Ponyville. I made to sure to insulate the walls so nopony could hear us."
"Is this it? It seems pretty barren."
"Well, I've been told that my experiments tend to become to outlandish and extravagant. This time, I took the simple approach and only brought the essential tools. ".
"Well then, where are they? I don't see anything else here?"
Twilight walked over to the bench and sat down. "I think it would easier to just show you. You'll understand once we start."
Twilight pointed a hoof to the end of the couch. "If you would kindly get the end of the couch, with your posterior pointing into the air, then we can begin."
Rarity wasn't sure what was going to happen, but she never less compelled. She hopped onto the couch and laid her head on the cushion. She moved her back legs over the edge and stuck her rear in the air. Her cheeks marooned at how vulnerable her position left here.
Rarity left out a held breath. "Okay, darling. I am in position. Now what do I do?"
Twilight responded by magically opening a drawer and levitating lengths of gray rope. "Try not to freak out."
"Freak out from wh..." Rarity was cut off when Twilight began wrapping Rarity in the rope. With a moment of practiced movements, Twilight finished tying Rarity down. The ivory unicorn was now entangled, strapped to the couch by numerous coils around her body. Her flank was still hitched high off the end.
Rarity turned a bit livid. "Twilight! What the hay is this?! Untangled me this instance!"
Twilight solemnly shook her head. "No can do, Rarity. It's imperative that once we begin, you can't quit and try to flee. We need to make sure you stay put."
Rarity's annoyance bled out into panic. "This is really so necessary? Just how bad is this ordeal going to be?"
Twilight said nothing, just fiddled back into the drawer. What see took out next scared Rarity more than any foe she ever faced.
Twilight has levitating a foot long, wooden spanking paddle. Rarity had a novice knowledge of bdsm and noticed the eight small holes drilled in were meant to decrease air flow. Meaning the spanking could have that much more force.
Rarity gulped at the sight. "I-I-I assume that is the first instrument to be used in these tests?"
Twilight nodded, her eyes closed in regret. "That's correct. It should provide ample damage to your buttocks. This particular item is famous in fetish circles for leaving quite a mark."
"I'm so glad you did your research.", Rarity deadpanned. "Wouldn't want to be savagely beaten by inferior devices."
Twilight couldn't chide Rarity for her attitude. She was going to have plenty reasons to be upset. "Yes. Yes. This tool will be more than adequate. So let's get to it then."
With that, Twilight took position behind the couch. Her vision filled with Rarity's big behind. At this angle, Twilight observed how massive Rarity's flank looked. Tying her to the couch had the effect of ballooning her rear. A fluffy white pillow, and just as soft. Twilight recalled how soft and marshmallowy it felt. Such a shame to ruin such a splendid rump.
But Twilight keep her mind on the end result. For the sake of her friends, Twilight calmed down and prepared herself. She took one last deep breath and aimed the paddle. She closed in on Rarity's sit spot and flung.
*WHAP!*
"AAAH!" Rarity cried out from the hit. The impact sent ripples through her rear and spread on the sting. If not for the rope, Rarity would have involuntarily jumped off the couch.
"Good Heavens, Twilight! They hurt!"
"That's the point, Rarity. The test must be painful. Very painful." She took aim again.
*WHAP!*
"Ow! Darn it!" Rarity hissed from the blow. She was already was not used to violence she had absolutely no experience taking a spanking. Never mind a spanking from a bucking Alicorn!
Twilight tried to reassure her friend. "Remember, the room is sound proofed. Feel free to yell out. Studies have shown that yelling can dull the pain."
"Oh, thank you for the advice, Twilight! You're even so kind!"
Twilight simply brushed off the aggression and swung once more, aiming for her cutie marks.
*WHAP!*
"Ouch!" Rarity wanted to move her flank around the ease the pain, but then remembered she was trapped on the couch. She forced to use sit there and be beaten. Rarity chose to instead focus on anticipating each...
*WHAP!*
"Hey! That strike was too fast!"
Twilight shook her head. "Sorry Rarity. I'm afraid you can't anticipate the hits. They need to be..."
*WHAP!* "EEP!"
"at random intervals. And at different intensities." At that, Twilight increased the force of her magic and swung at Rarity's haunches.
*WHAP!*
"OOWW!" Rarity screamed.
*WHAP!*
"Sweet Celestia!"
Twilight swung twice. *WHAP!* *WHAP!*
"BUCK!" Rarity rarely cursed, but she couldn't keep up her proper role. The pain in her flanks was just too excruciating. Every time her heart beat, her ass would throb. She could feel her white coat becoming rosy.
*WHAP!* *WHAP!*
And Twilight was holding nothing back. From foal hood, she took her research seriously. She made sure each crack gave Rarity a hard sting.
*WHAP!* "OWWW!
Twilight alternated locations, never hitting the same part of flesh twice.
*WHAP!**WHAP!* "DAMMIT TWILIGHT!"
She made sure to hit the bottom of her rump, where her thighs began.
*WHAP!*
She noticed Rarity reacted most violently when Twilight stuck her sit spot, so made sure to test that spot.
*WHAP!**WHAP!*
"OW! SURELY THIS IS ENOUGH NOW!"
"Not yet"
*WHAP!*
"But we are almost done."
*WHAP!*
"BUCKING HELL!". Rarity was crying yet, but her eyes began to water. The hits were so infrequent and changing intensities, she couldn't take this. Everything hurt her ass. Even the air hitting her bruised rump stung.
*WHAP!*
"HMMMPH!" By this point, Rarity dove her head into the cushions. She closed her eyes and just waited for this horrible paddling to end.
*WHAP!**WHAP!**WHAP!*
At the last hit, Twilight halted. She took note of how red Rarity's rump was. The color reminded her of ketchup, a red stain on a white canvas. She knew Rarity was suffering, but she couldn't stop now. Twilight knelt down to the Rarity's head and spoke to her.
"Rarity, we're almost finished the first part. However, this last part is going to be the hardest. The spanks will be a constant stream, with all my force. Please hang in there, it's almost over."
Twilight received no answer.
"Did you here me Rarity?"
Still nothing.
"Rarity?"
"JUST HURRY UP AND FINISH!" Rarity shouted from the cushions. She didn't want to talk, she wanted to be done already.
Twilight recoiled from the yell. She truly felt for the unicorn. This hard to be the most painful experience she ever faced. She promised herself she would make it up to Rarity later.
Twilight walked back into position. She channeled all her might into the paddle and to aim.
*WHAP!**WHAP!**WHAP!**WHAP!**WHAP!*
Twilight rained down blows upon Rarity's derriere. No breaks, no halts, no holding back. The paddle whistled as it flew through the air.
*WHAP!**WHAP!**WHAP!**WHAP!**WHAP!*
"MMMMMMMMPH!" Rarity didn't have time to screamed, just let loose a continuous moan into the cushions. Her body rocked forward at each hit.
*WHAP!**WHAP!**WHAP!**WHAP!**WHAP!*
For the next thirty seconds, the room shook with the sound of wood on flesh and Rarity's yell of pain. Twilight remained silent. She had to seriously tenderize Rarity, with all her concentration.
*WHAP!**WHAP!**WHAP!**WHAP!**WHAP!**WHAP!*
"And we're done." Twilight said. She floated the paddle to the foot of the desk. She step back and took notice of the results. Rarity's white fur was painted red, expect for the white patches where the holes connected. Twilight could feel the heat radiating from the battered rear end. She knew the flesh underneath the fur must be blood red right now.
Rarity still wasn't sobbing, but sniffling into the cushion. The pain was unimaginable. She thought she could mentally prepare for the spanking, but the reality was far from the truth. Twilight put her through the worst experience of her life. Every injury palled in comparison to the spanking, to the beating. She knew she have nightmares of this for weeks.
Twilight sat on the floor next to Rarity's head. "How are you holding out?"
Rarity finished sniffling and answered, "Well, I survived if nothing else. But my goodness, that was horrendous! You tortured me, Twilight! Tortured me!"
"I know, I know. I sorry it had to be that way."
"This damn barrier had better be the best in equestrian history!"
"I hope you realize how much I appreciate this. I would never do this to you without a clear purpose. Please know that."
Rarity sighed. "I know, darling. Let's just..., forget this terrible ordeal and move on."
Twilight managed a smile. "Good to hear. One test down, two to go."