Nightmare Moon returns! As it turns out, however, she couldn't care less about taking control of Equestria, since she had been unable to get release during her one thousand years on the moon and her balls have swollen to an outright titanic size, easily surpassing her already tremendous cock. Celestia, however, is confident that her favorite, little student is capable of taking care of the problem with the aid of her friends. Somehow.

The end of the Summer Sun Celebration came not with a bang. It came not with a whimper.

In fact, at first, it didn’t come at all.

“One thousand years,” Twilight said woozily. “One thousand years.”

“Yee-ouch,” Applejack said, wincing. “Nelly, but that’s gotta hurt.”

An earth-shaking groan answered her sympathy, though whether it had come from the villainess they’d sworn to defeat, or the monstrous package currently dominating the landscape, none of them could say.

“So,” Twilight said. She licked her lips, sizing up the target. “Who wants to take the first shot?”

“On…that?” Rarity asked. She gulped audibly.

Another groan, and another earthquake. All six of the Elements looked up at the towering figure before them. If Nightmare Moon herself had returned at such a titanic size, she’d have had little trouble conquering Equestria. As it was, though, the two town-sized testicles overshadowing Ponyville seemed enough of a problem for anypony.

One thousand years of pent-up frustration and no release certainly hadn’t done Nightmare Moon’s sex life any favors. Year by year, century by century, her testicles had swollen and churned with unspent seed, her hyperactive sex drive pushing her body into overdrive with each decade that passed without so much as a fuckbuddy, or even a single jerkoff session.

Now, a pair of titanic balls bigger than even Canterlot Castle glared down at them, each one coated in thin black fur, each churning with seed more loudly than the Friendship Express. Twilight didn’t even want to imagine the literal oceans of spooge sloshing around in that ballsack - although, if their mission from Princess Celestia was any indication, she had a grim feeling that she’d be able to do more than just imagine them very soon.

“Okay, everypony,” Twilight said. “We need a plan. How about - “

“Nggh! Grah!”

“What in tarnation?” Applejack squinted up at the mountainous cum-spheres and gasped. “Rainbow Dash! What in the hay do you think you’re doing?”

“I’m - “ Dash grunted as she smacked into the side of Nightmare Moon’s enormous stallionhood. Even though it was dwarfed by the oceans of spooge sitting right beneath it, it was still an incredible size on its own. Easily as long as two ponies, and just as thick, it stood up proudly in the air, its veins throbbing and pulsing even as a steady river of precum poured from the massive, flared head. At the other end, a near-comatose Nightmare Moon thrashed and moaned with each of Rainbow’s impact, the monster-sized cock flaring and shooting off another lake-sized volley of pre whenever she made contact.

“Rainbow Dash!” Rarity hollered. “That is not a proper plan!”

“Well, it’s - ngh - working!” Rainbow Dash took a moment away from her full-body-job to hover and scowl down at Rarity. “And I don’t see any of you doing anything to help!”

“Maybe it’s because we’re not sure if we should,” Rarity huffed. “Honestly, dear. An eruption from a stallionhood of that size would bring winter around a whole six months early!”

“I don’t think we have a choice,” Twilight said grimly. With a flash of purple light, she vanished from her place on the ground and reappeared beneath Rainbow Dash, standing on one of the titanic, churning balls. “Now, here’s what we’re going to do…”