"Big Mac, s'that you?" Granny Smith peeked up the stairs towards Big Mac's room. "What's wit..." Her voice trailed off as she beheld Princess Big Mac, jaw going limp.

"Hello, Granny." Big Mac stepped down the stairs in a lively canter. "Sorry, gotta do princess stuff. The day won't save itself." He gave the dumbfounded elder a firm nod. "Ah'll be back later." He brushed against her side as he walked past her, eyes on the door. "Ah'll make ya proud."

"Proud? What?" Granny spun to face him, but he burst through the door and took off on new wings. "Dang idjit! Ah'm already proud of ya!" Her angry words were heard by none and her impotent hoofshaking did little to bring the altered Big Mac back. Her hoof lowered to the ground and her rage faded to musing. "Mmm, maybe Ah'll finally get to be a great grandma after all..." Applejack seemed unlikely to come through on that end, but Big Mac...

Big Mac soared through the air, giggling in his new girlish voice as he felt the wind rushing through his fur. He was free, free of the shackles of the ground, but more than that. "Ah'm a princess." He reminded himself as his eyes swept over the town, looking for a specific thing. "Somepony must need mah help..." He saw a good target. A group of ponies were gathered around a juggler near the market, watching her bounce balls, rubber chickens, and other odd things around.

He wanted to be seen. He dove for them on sure wings, only giving a flap to come out of the dive at the last moment and land with what he hoped was grace before them. "Ponies of Ponyville," he spoke in a booming voice of a princess. "Princess Big Mac is here to serve you."

The juggler's arms fell and the things she was jostling collapsed around her.

Lyra tilted her head at the big red former-earth pony. "What the hay happened to you?"

Bon Bon smacked her over the head. "Watch your tongue, but, what she said. What happened?"

The crowd was filled with similar statements of wonder and curiosity. Lyra gave her friend a cross look before trotting up to Big Mac. "You're a mare..."

"Ah'm a princess," he countered.

"No, pretty sure you're a mare." She reached out and touched his cheek. "You're shaped like a mare. You sound like a mare." With a leaning, she peeked under his barrel. "Oh..."

Big Mac nodded confidently. "See?"

Without hesitation, Lyra scooted around Big Mac to peek at his back end. "Nope, mare." She prodded him right where a pony should not be touching without invitation. "See?"

Bon Bon stormed up "Lyra! I can't take you anywhere!" She grabbed her friend's ear in her mouth, clenched in her teeth and started pulling her away from Big Mac.

Big Mac let them go, his eyes on the rest of the crowd. "Ah'm a princess and am ready to save the day."

The Juggler, her things gathered back up, pointed to town hall. "Maybe they'd know if something was wrong? Are you alright?"

"Ayup." He gave a quick bobbing of his head before he trotted towards the town hall. He would be the best princess there ever was!

A confused male voice came, "Big Mac?" It was Caramel, the amber coated stallion approached him from behind. "Is... that really you?"

"Princess Big Mac," he corrected with a smile.

"Uh, yeah?" He looked to her confusing genitals, but his nose twitched softly. Much like Tree Hugger had before, Big Mac's presence was a corrupting one and he was falling into it with his proximity and lack of friend to pull him free. "Yer... a mighty pretty princess."

Big Mac warmed in his cheeks, tail giving a swish at the compliment. "Thanks kindly! Now, how kin ah help?"

Caramel stepped closer, his snout even with Big Mac's cutie mark. "Oh, help, sure. I was headed for town hall." He pointed the way. "I was going to get permission to do some repairs..." That sounded too pedestrian, and he wanted Big Mac to stick around. He wanted that more and more with every passing moment. "Caused... by a monster!"

Big Mac turned around, his snout barely an inch from Caramel's. "Monster! Now we're talkin'! Where's it at?"

Caramel's nostrils flared. Even her, his? Her. Even if Big Mac objected, she was a she as far as Caramel cared. Her breath was lovely. Her body was lovely. Every part of her... "Y-yeah... I... this way." He turned back towards his house, wondering how he would make up a monster for her to slay, then a thought struck him. "Actually... it ran off, this way." He veered off towards the Everfree. There would be no shortage of monsters there.

Big Mac trotted beside Caramel with a big smile. "Ah'll take care of it for ya, like a good princess."

"Best Princess," sighed out Caramel as they went. His shaft, normally well-behaved, began to slip free of his sheath, swaying left and right with every step. He wasn't even aware of it, his mind consumed on the red mare beside him. The drops of excited pre struck the ground, leaving a sporadic trail behind himself. "I bet you're real good..."

"Mmhmm." Big Mac nodded as they passed by Fluttershy's cottage. The yellow pegasus was outside, and seemed to notice them. He raised a hoof at her. "We're huntin' monsters," he called out to her. "Ah'll take care of it for ya, so relax."

"Um, thanks?" Fluttershy tilted her head at the two of them.

Caramel stiffened at Fluttershy's voice. His moment was shattered as he looked between her and Big Mac and squeaked, realizing that he was walking along with a huge erection. "I have to go!" He wheeled around and fled as fast as his hooves would carry him, shaft bouncing around wildly as it began to soften.

Big Mac sank to his haunches, pouting a little. "But... the monster..."

Fluttershy approached on cautious hooves. "What monster?"

Big Mac pointed in the direction Caramel had fled in. "He said one wrecked his house."

"Oh my." Fluttershy squinted a little, though it turned into a blink. "Have we met?"

"Sure we have," spoke the mare Big Mac. "Ah'm Princess Big Mac."

Fluttershy's eyes widened as the similarities became more obvious. "Big Mac?!" She glanced away and back. The handsome slab of a stallion she had carried a crush for had... become that? "You're a mare?"

"Nope." She turned and raised a leg to make the proof of his maculinity clear. "Ah'm a princess."

"You..." Her nose twitched softly. She felt a warmth stirring in her as memories of her feelings for Big Mac drifted towards the surface. "You're... less scary."

"Scary?" Big Mac perked one of his ears at her. "Whattaya mean?"

She reached out a hoof and felt his chest. "Still strong, but... less hard." Her eyes half lidded. "You're really Big Mac?"

"Ayup." He nodded firmly as he sat before her. "Ah didn't mean to scare ya none. Yer safe with me." He spread his wings out to wrap around her, drawing her close. "Ah'll protect ya."

Fluttershy's cheeks burned at the proximity. She squeaked demurely, but didn't struggle. Being held so close to the big stallionmare felt... nice. She felt safe, so very safe, but also a little... "Big Mac?"

"Mmm?"

She nuzzled into his belly softly. "You smell nice."

"Thanks." He nuzzled her between the ears. "Feel better?"

"Thank you, um, Princess Big Mac." The smile that spread on his face as she called him by his chosen name was brilliant. "You really like that name, don't you?" She leaned up to press her snout against his, nose to nose. "You're a pretty princess."

Big Mac felt his tongue grow wet, salivating from the praise. He ran it over his lips before he nipped at one of her ears. "Ah'll be yer princess."

"I... would like that." She nuzzled up under his chin. "You'll protect me?" Her nose pressed into his throat, nipping softly through the fur. "You'll never leave me alone?"

He squeezed her tighter to his front. "Nope." He raised his fore hooves along her sides, feeling the sleek muscles of the pegasus in front of him. "Yer a special mare too. We kin be heroes, together." He pressed his forehead to hers. "Ah'd like that."

Fluttershy's nose wriggled as a new scent hit it. Her eyes darted down to see Big Mac's pole starting to slither free, emerging an inch with every pulse of his powerful heart, and he had many inches to give to the world... or her. "Oh my..." Part of her wanted to flee away as quickly as she could, but most of her wanted to be nowhere else more than there, with Big Mac, and all he had to offer. "Is that... for me?"

"Ayup." He nodded softly. "We'll fight for harmony, together."

Fluttershy shrank away a little. "With that?"

"If ya want." He stood up and took a step towards her.

She did want it. Against all logic, even as she quailed with a conflicting brew of emotions, she leaned forward and kissed the very tip of the drooling member. Her soft little tongue darted out, cleaning it for but a moment. "Big Mac..."

A heavy weight landed on Big Mac's rump. He craned his head to see that Caramel had not run as far as he had figured. "Huh? Ya feelin' alright?"

Caramel hugged Big Mac's midsection with his fore hooves, pulling the princess closer. "I'm sorry I got scared, but I can't leave you! I want you, Princess Big Mac. Please tell me you want me too!" His eyes shone with insane glint of lust and corruption. "I'll be your stallion forever!"

Big Mac's tail twitched, wanting to accept the offer. "Ah'm a princess... Ah have to protect lots of ponies."

Fluttershy seemed oblivious to Caramel's presence, slowly nuzzling and kissing along the mighty spear before her. "You'll protect me..."

Caramel shuffled in place, lining up his own painfully rigid phallus with Big Mac's oozing nethers. "You'll protect me too. We... All hail Princess Big Mac!"

Big Mac's weeping vulva winked open at the sudden exclamation. "Ah'll... protect ya both." His front end lowered a little over Fluttershy as his rump wriggled in clear invitation for the stallion already mounting him. "Protect ya good."

As Caramel got the blunt tip of his eager pole to press directly to those twitching lips, Fluttershy gave the end of the shaft she was occupied with a kiss and turned around, her wings wide. "Protect me." Her vulva pulsed with desire, wanting nothing more than to be lost in the presence of her new princess.

Big Mac cried out like the mare she was more than not as Caramel sank several inches into her new passage. She could feel her tunnel trembling at the presence, trying to draw it deeper as she shuffled on her hooves. He... it was becoming confusing. He was a he as he grabbed for Fluttershy and thrust forward, seeking to ram his own, royal, penis into her waiting depths. The motion carried him away from Caramel, but he responded with a more powerful thrust, shoving himself halfway into Big Mac even as the princess was forced to press all the deeper into Fluttershy.

Both of the speared mares gave a shared cry of pleasure and surprise, caught on the swords of their mates and wanting little more than more. Big Mac drove back against Caramel, forcing his throbbing length to sink further into her rippling passage, but the motion drew her, er his, member from Fluttershy, so he pounded forward, driving Fluttershy forward with a squeak, but that made Caramel's shaft withdraw. He was caught between them, bouncing back and forth with competing needs, competing sexualities. She wanted to mount. He wanted to be mounted. Big Mac was a confused tangle of pleasure and lust.

Fluttershy dug her hooves in to anchor herself against each powerful piston slam of Big Mac against her. She could feel herself stretching around his intrusion just for him to draw back in constant motion. She was panting for breath, lost in the moment. "Protect me," she managed to gasp out as if the breeding of her would somehow shield her from a hostile world. "My princess!"

Caramel pulled his princess back with each smooth shove into her welcoming interior, driving fluids out around his rigid shaft with every motion. His great equine balls slapped up against her perfectly rounded ass at the end of each pound. The cries she made were music to his lost mind. He would play her like the priceless instrument she was. "Protect... me..." he grunted out, despite being the one topping Princess Big Mac.

Big Mac, lost in his dual pleasures, hit the peak first. He could feel his balls jump, seed pouring hot into his shaft, running down the powerful equine length even as her passage tightened around Caramel and began milking him wildly. He called out without words, all senses going white with the power of the drugs that swamped her system in a moment of utter completion.

Fluttershy squealed as she felt the bulge traveling along Big Mac's pole, though it turned into a throaty moan as it splashed into her. A thought that she might become with foal came to her, and she didn't care. Her princess would protect her, always. She collapsed, twitching with washes of pleasure as her inside and out convulsed with abject delight.

Caramel was the last to tip over, the tightening and wildly rippling tunnel of Big Mac driving him on to manic little pushes. The sensitive end of his shaft swelled as he hit his limit, driving himself in as far as he could as he blew his load into the fresh womb of his princess. He stood perfectly still for that precious moment as rope after rope of life giving seed flowed before his muscle tone betrayed him. He collapsed onto Big Mac, who collapsed onto Fluttershy. The entire mass quivered before they all fell over together, still in that shared union with only the sound of their gasps for breath between them.

Author's Note

I shall pose that question from before. Do we follow Big Mac, or is it time for the cube to find another poor pony around Ponyville to keep spreading its gifts to?

I would say that Big Mac is very pleased with the gift given to him, er her, er... them.