A week had passed since the physical and Princess Cadance and Shining Armor's visit. The day after, she was told that because of the transparency of the sample she gave, there were no traces of sperm cells, something she found out on her own early on. Every morning since, Twilight Sparkle looked under the sheet and there it was: the giant horse cock she cast upon herself still between her legs. Cadance told her it would last only twelve hours. Either Cadance lied to her or Twilight messed up part of the spell. It wouldn't have been the first time she screwed up casting a spell.

It wasn't without its perks, though. Every morning after getting out of bed, Twilight took a bath and rubbed one out with her magic to help keep her mind clear. Spike would ask what took her so long and Twilight told him she wanted to make sure she was good and clean. Not a complete lie, as she was a princess, after all and she needed to look her best for everypony.

Then came the wardrobe. She did a good job keeping her extra bits hidden when she went out anywhere. Rarity complimented her attire on several occasions, whether they were genuine or just to butter her up for a favor, Twilight did not want to know.

Twilight made her way from her personal quarters to the throne room. She could easily teleport, but she found she rather enjoyed walking through the castle, despite the loneliness of it.

She would pass several stained glass windows which provided a rainbow of colors as the sun shined through them. Many of which represented her and her friends' accomplishments: Luna's purification; the fall of Discord; Chrysalis' defeat by Cadance and Shining Armor; the liberation of the Crystal Empire; Twilight's ascension and the defeat of Tirek.

Roughly in the middle of the hallway, there were six particular windows that she always took a moment to admire, they were of her and her friends, each circled around her.

Twilight heard ragged panting as Spike ran up to her. “T-Twilight!”

Twilight looked to her left as the baby dragon approached her. He was clearly out of breath and on the verge of collapsing. “Is there something wrong, Spike?” She asked in confusion.

Spike bent over, out of breath. He raised a claw as he panted. Twilight's patience was wearing a little thin with him, but his breathing eventually slowed. “Applejack wants you to help her at the farm.”

Twilight gave the dragon a smile. “Thank you, Spike. I was planning on heading there anyway. Would you like to tag along?”

Spike grimaced. “She'll probably want to put me to work. It's hard for me to pick those apples, I have to climb the trees to get to them.”

Twilight giggled. “It's good exercise. Besides...” she poked a hoof in the dragon's belly, “you could use it.” Spike climbed onto Twilight's back and she teleported out of the castle.

The princess set hoof on the Apple property, Sweet Apple Acres and was greeted by Applejack. “Good morning, Applejack. I came as soon as I could.”

Applejack smiled. “Thanks, Twi. I was wonderin' if ya could help me out in the barn. It's Apple Bloom's birthday tomorrow and I want to surprise her.”

Twilight giggled and nodded. “Of course. Is that cider order ready?”

Applejack nodded and looked toward a very annoyed Spike. “Aw, shucks, Spike. You didn't have to tag along.” Spike's eyes widened in surprise and she chuckled. “If ya want to, why don't you go hang out with Apple Bloom for a while, keep her distracted.”

Spike gave Applejack a quick salute. “I'm on it!”

Spike ran off to find Apple Bloom and Twilight giggled. “Are we ready?”

Applejack nodded as the two headed out. On the way to the barn, she examined her friend's clothes. “So what's with the fancy getup? Are ya gettin' ready for some kinda shindig in Canterlot?”

Her face went flush and she shook her head. “N-no. I just felt like wearing clothes.”

Applejack chuckled. “For a whole week? What are ya hidin', Twi?”

Twilight backed away from her friend. “N-nothing. Honest!”

Applejack wrapped a foreleg around her friend and squeezed her. “Shucks, Twi. You got yourself a special somepony, don't ya? And you want to spiffy yourself up for 'em.”

Twilight laughed nervously. “You got me, AJ.”

The two stopped at the front of the barn. Applejack opened the door. “Alright. The sooner we get this done, the sooner y'all can be out with your cider.”

With her magic, Twilight positioned a nail against the board and drove it in, securing the sign. Twilight wiped some sweat off her brow and let out a breath. “That's the last one.” She turned her gaze toward Applejack and caught herself staring at the apple farmer's filly-bits.

Applejack turned and saw her friend's face was flush. “Y'all okay, Twi? Do you need to rest?”

Twilight looked away and nodded. “Yeah... I think I will for a moment.”

Applejack raised an eyebrow as she saw her friend walking awkwardly. “Twi? Are you sure you're alright? You're not hiding anything are ya?”

Twilight let out an annoyed grunt. “No, Applejack. I'm-” before she could finish her sentence, Twilight found herself being tackled. “Whoa!”

Applejack landed on top of Twilight and felt something poke her nethers. “Whoa, nelly!” She yelped and jumped off of Twilight. “What the hay was that?!”

Sitting up, Twilight hung her head and sighed. “I suppose I can't hide it anymore.” She used her magic to remove the clothes she wore and set them to the side. “I received a spellbook last week from Cadance and I cast one of the spells on myself.” She moved her forelegs to reveal her growing erection. “It was supposed to last only twelve hours, but...”

Applejack poked at Twilight's member and chuckled. “Gee, Twi. If I knew you had this, we woulda had some fun sooner.”

Twilight's eyes widened. “Y-you're not disgusted by it?”

Applejack scoffed. “Disgusted by a penis? I've seen lots of 'em. Big; small; wide; narrow. I've also taken a few, and sometimes more than one at a time.” She said, accentuating her claim by nudging Twilight. “I never saw one on a filly though, so this is different. Who else knows about it?”

Twilight smiled bashfully. “Aside from Shining Armor, Cadance, Doctor Stable, Nurse Redheart and you, nopony.”

Applejack raised an eyebrow. “Really? I woulda thought you'd want to try to bang every mare in Ponyville with that beast.” She rubbed her chin in thought. “Though I do suppose you'd want to keep your image.”

Twilight nodded. “Thank you, Applejack.”

Applejack smiled. “No problem. Say... you wouldn't mind if I tried it out, would ya?”

Twilight laid back and spread her legs, giving the apple farmer easy access. “Go right ahead. Since it's a magically created penis, my body doesn't produce semen for it.”

Applejack shook her head as she leaned in closer to her friend's cock. “Aw shucks, I was hopin' to carry little Twilights.”

Twilight blushed and looked away. “Maybe I can figure something out. Cadance did use a gender-swap spell on my brother. I'll have to experi-” she felt Applejack's slick, wet tongue make its way up to her tip from the base of her penis. “Ah!”

Applejack ran her tongue over Twilight's tip and lapped up some precum. She pulled her head back and looked to Twilight while stroking a hoof along her member. “You talk too much, Twi. Do your experiments later and just enjoy the moment.”

Twilight nodded in agreement as her friend laid gentle kisses on her hardening cock. Twilight moaned from AJ's tender ministrations. “That feels good, Applejack.”

Applejack traced her tongue up to the tip and pulled back. “Glad I could help, Twi. I love me a big, thick cock. Heck, I think you're about as big as Big Mac right now.” The mention of her brother's name made Twilight even harder and Applejack's eyes widened in surprise. “Oh my... I think you're gonna be bigger than Mac.”

Twilight panted and gave her partner a sultry grin. “Is... is that g-gonna be a problem?”

Applejack matched the grin with one of her own before wrapping her maw around Twilight's cock. The cowpony was determined to take the monster balls deep in her mouth. One of her forelegs made its way to her eager pussy and began rubbing it while bobbing her head along Twilight's shaft.

Twilight closed her eyes, bit her lip and involuntarily bucked her hips as Applejack took the cock like a professional. Applejack's wet, slippery tongue coated her length as she took it deeper and deeper. Soon, she felt something touch her tip, it was the back of Applejack's throat and her lips were barely touching her ring. The sensation sped up Twilight's heart rate and she realized she was on the brink of orgasm. “AJ... I... I'm about to cum!”

Applejack sped up her ministrations, hoping to get that cock deep inside her so it would deposit that sweet, delicious spunk directly into her belly. Between this and Twilight's bucking, she felt Twilight's balls smack her chin. One last pull and push, Twilight screamed and Applejack slammed her face into Twilight's fur as thick ropes of cum shot into her belly. Applejack pulled the behemoth out of her mouth and one last spurt shot out of Twilight and onto her face.

Twilight's body felt like jello as she relaxed in the afterglow. “That was incredible, Applejack. I didn't think you could take it that deep.”

Applejack wiped her face and looked at the semen on her hoof. “Y'all weren't kiddin', were ya? Caramel's spunk ain't this clear.”

The barn door opened and Big Macintosh entered. He looked to his sister, hovering near Twilight's midsection.

Applejack smiled. “Howdy, Mac! Care to join us?”

Big Macintosh found himself getting hard. He nodded and walked to the mares with a big grin on his face. “Eeyup.”

Applejack helped Twilight off the ground. “Come on, Twi. Let's get ya on that hay bale over there.” The two moved toward the nearby bale and she gently laid Twilight on it. She spread Twilight's legs, revealing her dripping honeypot. “Y'all look like you're as wet as I am.” She chuckled. She looked to Big Macintosh and waved him over. “Are ya ready to plow her field?”

Mac glared at his sister and shook his head at her terrible pun. “Eeyup.” He made his way toward Twilight and saw her cock.

Applejack looked at her confused brother. “This ain't gonna be a problem is it?”

Mac shook his head as he planted his forelegs on the bale on either side of Twilight. “Nope.”

Applejack nodded and climbed up on the bale and slowly lowered herself onto Twilight's hardy member. Facing her brother, she pressed her lips against her brother's and slid her tongue into his mouth, wrestling with his.

Twilight felt her folds separating as Big Macintosh slid his girthy cock into her, rubbing itself along her slick walls as well as Applejack's as she pumped herself up and down her tight wet pussy. She had no idea how aroused she was as Big Macintosh effortlessly slid into her, tickling the deepest parts of her and slapping his balls against her wet ass. “No wonder they- ah- call you 'Big Mac'.” She moaned.

From the muffled moans coming from Applejack and Big Macintosh and the wet sounds coming from every ponies' crotches, Twilight felt the urge to explode once more. “Oh! I'm going to cum!”

Applejack broke the kiss and turned to her friend. “Already? But Mac barely started.” She returned her gaze to her brother and grinned. “Come on, Mac. Show her what you're really made of.”

Twilight was suddenly struck with an idea. “I got it!” Her horn fired up and enveloped herself and the others in her magic, casting the sensory enhancement spell on the three.

In an instant, Applejack's experience became a hundred times more vivid. She felt every vein of Twilight's throbbing cock rub her slick walls, the wet splashes of their mare juices were much clearer and was overwhelmed. “Oh... my... goodness! Twi! I... I'm gonna cum!”

Big Macintosh fared no different. Somehow, Twilight's nethers felt tighter and slicker than it had moments before. He felt every vein in his member throb in time with every beat his heart made and the pressure in his loins was reaching its peak. “Eeyup!”

In unison, the trio came. Applejack threw her head back, screaming as her pussy clenched itself around Twilight. Twilight's ears were bombarded by screams of ecstasy. Ropes of cum sprayed out of her cock and into the deepest parts of Applejack. Her walls clenched on Big Macintosh's massive member as he shot load after load into her. He kept pounding her tight snatch until there was nothing left.

Big Macintosh pulled out of Twilight and collapsed on the floor beside the bale. Applejack staggered to her hooves and fell on the other side of the bale. They laid there, lost in the afterglow as they caught their breaths.

Twilight felt a tingle emanating from her crotch. She looked there out of curiosity and the penis started disappearing. After it finished, Twilight laid her head back and chuckled. “So, how was it?”

Applejack chuckled. “Better than I expected, Twi. I hope you'll play around with that gender-swap spell you were talkin' about.”

Twilight slowly nodded. “Of course.” She looked toward Mac and his now flaccid penis. “You doin' okay there, Mac?”

The gentle giant nodded, smiling as he thought he was the luckiest stallion in Equestria. “Eeyup.”

Twilight looked around and saw the mess of cum and sweat they made. Fortunately it was localized near the hay bale. “We should probably clean up, it still needs to host Apple Bloom's party.”

Author's Notes:

Okay, I think it's safe to say we've had our fun with futatwi. There's only so much one can do before it goes stale.

Thanks for reading, and be sure to check out my other stories.