Middle-Mare

The next morning, Princess Cadance opened the door to her bedroom chambers at precisely the right time. On the other side, the ever-punctual Twilight Sparkle had just barely come to a stop outside the door. Her mane was still matted down. As instructed, she hadn't bathed. She reeked of Cadance's musk seeping into her fur. It was the princess's way of marking her territory. It had gained some strange looks from the guards along her trot of shame down the hallway from her bed chambers to Cadance's. But she persevered, determined to get her prize.

Cadance wordlessly pulled Twilight inside and closed the door. She twirled her hoof, instructing Twilight to turn around. Twilight did so and Cadance's magic reached inside Twilight's pussy to pull out a lacy pair of her panties that she had stuffed inside the night before. With a curt shove, she pushed Twilight into her closet with a hoof to her lips to keep quiet.

Cadance climbed back into bed and pulled the very wet panties most of the way up her legs before pulling the blankets back over herself.

A minute later, Shining Armor stepped out of the shower right on time for his morning routine. He remained a stallion of military efficiency after being in the Royal Guard. He finished combing his mane and walked out into the master bedroom of the royal chambers. Cadance was lounging in the bed, waiting for him. "What's on your agenda for the day?" she asked.

"The Steward of Gryphonstone is arriving at the train station today," Shining answered. "I'm meeting him there to go to a lunch. Apparently there's a club in the empire that features hippogriff dancers, and he wants to see how they compare to gryphons, and I'm probably buying the entertainment."

"Well, you know the rules, Shining. No going off to those sort of dance clubs without getting your balls drained first."

"Can it wait until after breakfast?" he asked.

"No. Now get on the bed." Cadance threw the blanket off the bed and made a show of pulling her panties off, giving them a twirl on her hoof.

Shining Armor's nostrils flared, smelling her scent heavy in the air. "Yes dear."

Twilight watched from inside the bedroom closet, looking through the thin slats of the door. Shining Armor sat on the edge of the bed facing the closet. Cadance's magic pushed him back to lay on the bed with his legs hanging off the edge. Cadance took the panties soaked with Twilight's arousal and draped them over Shining's face. His hooves pressed them into his face harder as he unknowingly huffed his sister's scent deeply. Twilight could hear her brother groan and she could see his dick start to sprout.

"There we are," Cadance purred. She climbed over him and straddled his midsection, facing the closet, and obscuring his upper half from Twilight's view. Cadance flicked her tail in his face as she shimmied forward slightly. Her magic stroked his dick, getting it to full mast before she held his thick girth flat against her belly with a heavy slap. She looked at the closet and smirked at Twilight through the door, showing off how deep it would go inside her.

She got up onto her knees and lifted herself just high enough to get it under her before sliding back down on it slowly. She never took her eyes off the closet, knowing full well that Twilight was watching. "It's so good the way your dick feels sliding inside me!" Cadance played with her pussy as she went lower. She leaned back so Twilight could have a good view of her pussy stretching around Shining's thick medial ring as it popped inside her. By the time Cadance bottomed out, Twilight could see the bulge his dick was making in her abdomen. She leaned back even further to accentuate the bulge to an uncomfortable degree. But it was worth it to feel Twilight's seething envy radiating off her. Cadance rubbed his dick through her stretched belly with her hoof.

Cadance started riding him slowly, keeping him as deep as she could to show off the bulge he was making. She played with her pussy some more and moaned. "Oh, your big dick makes me cum so easily!" Shining's balls glistened as her wetness dripped out of her and coated his scrotum.

Twilight waited inside the closet impatiently. Cadance hadn't divulged the details of the plan to her. Perhaps she would turn off the lights. Or blindfold him and they would secretly switch places. Or some kind of advanced teleportation or mind spell.

The bulge in her abdomen flared larger. "Cadie, I'm close!" Shining groaned from under the panties. "Are you gonna swallow it again?"

"Not this time," Cadance said with a knowing smirk. A ring of her magic encircled the base of his dick to keep him from going off yet. Another spell enveloped his balls, making them glow and swell larger.

"Cadie, what are you doing!?" he groaned in a mixture of pleasure and discomfort.

"A virality spell," she cooed. "I think we should try for another foal!"

"But I thought we were one and done!" he wheezed.

"I supposed you could just not cum at all," Cadance said, tightening the ring around his dick.

Shining whimpered. "Okayokayokay! Fine! Please just let me cum!"

"Yes! Give it to me! Give it ALL to ME!" The ring of magic on the base of his shaft snapped free and Shining moaned so loudly it bordered on a scream and his magically enhanced balls flexed and squeezed. Twilight could see every detail of her brother's shaft twitching and throbbing, pumping load after huge load up into Cadance, with the weight of her body pressing her cervix directly against Shining's flared tip.

The bulge of his tip in her abdomen vanished as her womb swelled, inflated with a supernatural amount of his cum. Cadance's magic swirled around his balls, refilling them again and again. Shining cried out as she prolonged his orgasm, until she was bloated to capacity, looking like a gravid mare well into her second trimester.

Cadance rubbed her belly with her hooves with a satisfied smile. "All mine!"

Twilight was fuming in the closet. Cadance had done nothing to get Shining's semen to her, and now she had taken his entire load for herself! There was no way she wouldn't get pregnant from that, and Twilight would be forced to watch her carry Shining's foal once again with intense envy.

Cadance slowly eased herself off of his wilting erection and flopped onto the bed beside him while he caught his breath. She leaned over and sucked his dick.

"Cadie!" Shining whined in a high pitch, still over-sensitive from cumming so hard. Cadance mercifully sucked and licked just long enough to get him clean without needing another shower, including her own juices from his now-normal-sized balls.

"Off you go now!" Cadance chimed. "You don't want to be late now, do you?"

Shining groggily rolled off the bed onto his hooves. Cadance quickly combed his mane again with her magic and had him back to looking as good as he did when he had walked in. Shining looked at his rotund wife on the bed and just sighed in abject disbelief. Still, it wasn't even the kinkiest thing she had done with him that week. Maybe she would get pregnant. Maybe not. He could worry about it later.

"Alright. Love you, Honey," he said. Cadance, with her mouth fresh off his cum-covered dick, offered her cheek, which he kissed and then departed. Cadance waited about a minute before opening the closet door. Twilight glared at her.

If looks could kill...

"Why so cross?" Cadance asked. "You wanted me to get Shining's semen for you, and I have." Cadance rubbed her stretched tummy.

"What good is it to me if it's already inside you!" Twilight huffed as she stomped across the room.

"Come now Twilight," Cadance teased. "Do you really think me so short-sighted? Have a taste of my good faith." Cadance's magic pulled Twilight closer and Cadance kissed her, forcing her tongue into her mouth. Twilight resisted at first, but then she tasted it. She tasted her brother's cum in Cadance's mouth. Twilight's mood turned on a dime and in an instant she started aggressively kissing Cadance back.

Cadance was only too happy to oblige the mare of her affection, swapping as much spunk as she could into the younger mare's mouth until there was nothing left but saliva. Twilight's excitement melted away into disappointment. "There's no need to pout, Twilight. There is plenty more where that came from!" Cadance said, motioning to her crotch.

"Yes! Yes, give me more!" Twilight said.

Cadance crossed her legs tightly. "Well, now I don't know if I want to, after the rotten attitude you had. Maybe if you ask nicely."

Twilight grit her teeth briefly but shoved down her anger. "Okay, yes, please give it to me."

"I think an apology is in order, first."

"For WHAT!?"

"For being a bitch," Cadance said as nicely as she could.

Twilight felt like a blood vessel in her neck was going to pop. "Okay. Fine. I'm sorry for being a bitch. Now please let me lick your pussy!"

"You can ask nicer than that."

"Please, pretty please, with sugar on top, let me lick your fucking pussy!"

Cadance smirked. "I told you I'd have you begging for it." She laid back on the bed and spread her legs. Twilight all but dove between them. She shoved her muzzle as deeply into Cadance's snatch as she could, licking aggressively to try and get every last drop of her brother's cum. She was remiss to find so precious little of it leaking out. The rest was securely locked inside Cadance's womb, behind her tight cervix.

"It's supposed to be in my womb!" Twilight complained.

"And it will be if you're a good little filly!" Cadance said, as her magic pushed Twilight onto her back. Cadance crawled across the mattress to straddle Twilight's hips sideways, holding one of her legs up to scissor her, pressing her pussy flush against hers, lining up their vaginas. "Now with just a few Kegels, I can squeeze his whole load down into you!" Twilight's face lit up, understanding now what Cadance had planned.

"Yes! YES!" Twilight squealed.

Cadance took a deep breath and got ready to push. But then she didn't. "You know, this seems rather imprecise," she said. "If we're going to do this, we need to make sure we do it right!"

"This is right! This is fine!" Twilight begged anxiously as she ground her hips up against Cadance's pussy, trying to coax her brother's cum out of her. "Please just give it to me! I can't wait another minute!"

"Tsk, tsk, Twilight!" Cadance chided. "Haven't you ever heard of foreplay?"

"I- I just had my face in your pussy!" she said.

"Now, now, this won't be but a minute! Let's make sure we give you the best odds of success after all." Cadance shifted off of her and aimed her horn between Twilight's legs. "And now for a well-aimed fertility spell..." Cadance shifted forward, sliding her horn inside Twilight's vagina. "And a one and a two and a..."

A warm pulse radiated out of Cadance's horn and flushed through Twilight's abdomen. Her spring estrus had been uncomfortable before, but now it was a conflagration of burning heat in her loins. She had wanted her brother's semen before. She craved it. But now she needed it. She needed the seed of a stallion to douse her flames, any stallion, as soon as possible.

Cadance pulled her horn out and looked at the mare under her, a panting, ragged mess. Her sweat only brought out the scent of Cadance's marecum stained into her lavender fur and mane from the night before.

"F-fuck me!" Twilight panted in both exasperation and as an imperative.

"I have just the thing!" Cadance said. Her magic opened her night stand drawer and lifted out a large, silicone dildo. "Recognize this?" she asked. "He and I made it together using a mold of the real thing."

Twilight indeed recognized it. How could she forget what her brother's dick looked like after it had been seared into her memory earlier that morning. It even had the same pattern of blue mottling. A narrow tube extended from the base, attached to a tube with a plunger.

Cadance showed it to her. "I'll fill this up with his cum and then... well, I think you get the idea." Indeed Twilight did. She nodded excitedly and laid back with her legs spread. Cadance grabbed a harness from the drawer and affixed it to the dildo, strapping it onto herself.

"Wait, what are you-"

"You asked me to fuck you," Cadance said. "Now bend over!"

"Uh," Twilight hesitated, but Cadance flipped her over with magic and mounted her. Twilight let out a squeak as she felt Cadance press the thick tip against her virgin pussy. Twilight was plenty wet as Cadance rubbed the tip across her marehood. She smeared her copious lubrication along the shaft, but was still met with resistance.

"Hmf!" Cadance scoffed. "It's a good thing you never tried to seduce Shining! He'd be disappointed that his big dick would never fit inside your tiny filly hole!"

"It can too fit!" Twilight whined. She pushed herself back against Cadance a bit harder, getting the tip to pop inside. Cadance smirked. Reverse psychology never failed.

"Well, I still think he's way too long to ever be able to get his whole shaft inside you," Cadance teased. "That's quite important to a stallion. You would know that if you ever had one!"

"I can take the whole thing! I know I can! Do it! I'll show you!"

Cadance just smiled and obliged her, making little thrusts with her hips working more of the strap-on deeper inside Twilight. His every veiny texture was perfectly captured in the mold, and on the surface of the dildo. It was firm, but flexible and soft. The same spongey texture of the real thing. "How does your brother's penis feel inside you?" Cadance asked.

"It's wonderful!" Twilight breathed.

"You think you can take more?" Cadance asked. Twilight nodded with enthusiasm. Cadance pressed forward. Twilight could feel the tight entrance of her pussy strain to stretch around the thickest part of his medial ring. But she made no whine or whimper, determined to get it inside her like a big mare. With just a bit more pressure, it slipped inside her. A moment later she felt the warmth of Cadance's hips against hers. "Well how about that," Cadance said with pride and just a bit of surprise. "You took the whole thing!" Cadance grabbed Twilight's hips and pulled her back against her. Twilight felt butterflies in her stomach as the tip lightly kissed her cervix. "You really are a perfect fit for each other!"

"Yes, yes!" Twilight cried. "It fits perfectly! Now pump in his semen!"

"Oh, but I'm not done with you yet!" Cadance said, pulling her hips back and then thrusting forward again. "You haven't even cum yet!" She started rutting Twilight properly, like a stallion. The medial ring rubbing against Twilight's G-spot, along with Cadance's magic on her winking clit, it didn't take long for her to cum. But Cadance just fucked right through her fresh wetness, keeping her peak stretched out into a plateau of pleasure.

"You're lucky, you know," Cadance said over the sounds of Twilight's whorish moans. "The longest I've ever seen Shining go was just over a minute. He would have definitely gone off before now. And if not, if you came like that while he was fucking you, that'd be the end of the ride for sure! But not with me. This will never go soft. And I could fuck you all day, all night, for as long as I want!"

"P- Please!" Twilight begged as she came again and her eyes started to go out of focus. Her horn started to glow. Cadance plucked a ring from her drawer and snugged it over her horn.

"Ah, ah!" Cadance chided. "Naughty filly!" She pulled out just enough to give Twilight's legs clearance to flip her onto her back.

Twilight's world spun and she looked up at the mare towering over her, fucking her just as fast as she was before. Her round belly, full of Shining's cum, jiggled with every thrust. Cadance followed her eyes and she paused for a moment to put her hooves on her abdomen. "You want this, don't you?"

Twilight nodded with pleading eyes.

Cadance grinned. "Maybe I'll keep his cum for myself! After all, he is my husband. It's mine by right! It's MY cum!"

"No!" Twilight's vision blurred with tears and her legs tried to kick her away, but her muscles were too weak from being cum-drunk. She was helpless to stop the other mare from fucking her.

"Beg for it!"

"Please! Please let me have his cum!" Twilight begged.

"It's mine!"

"Please!"

"Beg for my cum!"

"Please give me your cum!"

"You want my cum inside you?"

"Yes!"

"You need it!?" Cadance pulled the plunger tube off the other end of the dildo hose.

"Yes! Please!"

"Say it! Say my name!" She pushed the hose inside herself.

"Please cum inside me Cadance!"

"HA!" Cadance pushed the end of the tube through her cervix. A pulse of her magic flashed and the two of them turned crystal. Cadance looked at the tip of the dildo against Twilight cervix and Cadance flexed her Kegel muscles. Twilight could see the massive load of her brother's cum rush up the tube, through the dildo, and into her womb. The stallion semen splashing inside her was instant relief of her burning heat, but Cadance had much more to give. Her magic joined her muscles helping her to squeeze out the rest. Twilight's breath rushed out of her as her bloated womb pressed against her diaphragm.

Unlike Cadance, Twilight was unaccustomed to having her uterus stretched so large. It was uncomfortable, to say the least. But even so, Twilight could not keep the grin from her face as she looked down at the swirling storm of her brother's cum inside her belly. But all good things come to an end. The rush of magic passed and the crystal affect wore off. Twilight was left looking at her round, lavender belly. She looked up at Cadance, still hovering over her with her hips pressed up against hers, now sweating as much as she was.

"Thank you!" Twilight panted.

Cadance smiled. "Oh, there will be plenty of time for you to properly thank me later."