I used NovelAI's unlimited gen membership for $25 a month. Note that "unlimited" is kind of a lie, it's only unlimited if you're under a certain resolution and only if you're not using any of the advanced features. Upscaling and other features cost the on-site currency, which the membership gets you 10000 a month. That should be more than enough for a month, but you can burn through it quickly since NAI gens so quickly.

The bass from Vinyl Scratch’s custom turntable thumped through the packed Manehattan arena like a second heartbeat. Spotlights sliced through the dark, painting the stage in swirling blues and hot pinks. The crowd—three thousand screaming fans packed shoulder-to-shoulder in the stands—roared in time with every kick of the drop. Cheerleaders in tiny purple and black outfits waved light sticks shaped like eighth notes and treble clefs.

Vinyl Scratch stood center-left, naked from the waist up, her blue mane whipping wildly under the stage lights. The massive pink dildo—nine feet of glossy, veined horse cock, thicker than her own thigh—loomed between her legs like a mechanical bull. Her tail flicked nervously as she gripped the control booth railing, but her purple sunglasses hid half her face, and her lips were already curled into that signature grin.

“Alright, everypony!” she yelled, voice raw from the mic. “We’re three songs deep into the set and the beat is still comin’ hot! This next drop is gonna be legendary. You hear me? You feel me? Then drop it with me!”

The arena exploded. Confetti cannons burst overhead. “DROP IT!” the fans chanted back in a thousand voices. The sound was deafening, vibrating through the floorboards.

To her right, Octavia Melody stood like a statue carved from moonlight. Her long dark-gray mane spilled over her shoulders, the pink bow tie at her throat slightly askew from the heat. Sweat already beaded along her collarbone. Her light-purple eyes were wide, cheeks flushed dark pink. The enormous purple dildo—eight feet, midnight-blue, spiraling ridges that caught the light like a cello scroll—curved upward between her thighs, its fat head kissing the soaked folds of her pussy.

“Vinyl, darling, are you certain about the choreography?” Octavia called, voice smooth as velvet but edged with the tiniest nervous tremor. “My… my tail is already quivering. I don’t want to embarrass myself in front of everypony.”

Vinyl laughed, the sound bright and unhinged. She reached over and gave Octavia’s hip a playful slap that made the Earth pony’s breasts bounce. “Embarrass yourself? You? Octa, you’re the one who turned our electric cello set into the biggest rager in Manehattan history. Now stop yappin’ and focus on the bass. When the drop hits—BOOM—we’re plungin’ in. All the way. You hear that? All the way.”

Octavia swallowed hard, her throat working visibly. She could feel the slick, heavy weight of the toy against her labia, the heat radiating from it like a furnace. Her clitoris was already throbbing, swollen and desperate, but the sheer size terrified her. She glanced at the audience—thousands of eyes locked on them—and felt a fresh wave of heat flood her core.

The music swelled. The opening riff of “Electric Cello Dubstep” thundered out of Vinyl’s speakers: a distorted cello note layered under crushing 808 kicks and vinyl-scratch effects. The beat dropped into the pre-drop tension, the crowd’s chanting turning into a heartbeat.

Vinyl bounced on her toes, fists pumping. “One… two… three…”

Octavia’s breathing quickened. She could smell her own arousal—sweet, musky, unmistakable in the hot stage air. The air conditioner in the booth fought a losing battle; the lights made her coat glow with a fine sheen of sweat.

Then the drop.

The bass hit like a freight train.

“DROP IT!” Vinyl screamed, throwing her arms wide, hips rolling back in perfect time with the kick.

Octavia’s ears pinned flat. Her pussy clenched involuntarily, the swollen folds parting around the head of the purple dildo as the force of the bass shook the stage. The toy surged forward, stretching her wider than she had ever been stretched in her life. A strangled cry tore from her throat.

The crowd lost their minds.

“OH MY GOD SHE’S TAKING IT!”
“GO OCTAVIA, TAKE IT DEEPER!”
“DROP IT, YOU CUTE LITTLE CELLO SLUT!”

Vinyl didn’t wait for her. She planted her hooves wide, tail lashing, and drove her hips forward with a guttural moan that mixed laughter and raw ecstasy.

Both ponies slammed down at the exact same second.

The sound of their combined weight hitting the dildos was wet and obscene—flesh meeting silicone, a symphony of squelching, stretching, and gasping. Vinyl’s pussy lips split obscenely around the thick pink shaft, the flare at the base catching just inside her entrance and forcing a brutal, burning stretch. Her clit dragged along the underside with every inch she took, sending lightning bolts of pleasure straight up her spine.

Octavia’s mouth fell open in a silent O. Her eyes rolled back. The purple dildo was impossibly deep already, the ridges catching on every sensitive fold inside her. She could feel the toy bulge her belly slightly from the inside. Her hind legs trembled violently. A thin trail of her squirt leaked down her thighs, dripping onto the stage and the base of the dildo.

“F-Fuck—!” Octavia cried, voice cracking. “Vinyl—oh stars, it’s so deep—!”

Vinyl’s laugh turned into a broken moan as her own pussy stretched around the pink monster. “That’s it, Octa—take it—fuck, I feel it too—my walls are burnin’—!”

The crowd roared louder than the music. Ponies waved, stomped, chanted. Some in the front row had their phones out, filming, cheering every wet slap of flesh against silicone.

But the dildos weren’t stopping.

Vinyl’s hips bucked upward involuntarily, forcing another inch of the pink toy inside her. Her belly swelled visibly with the bulge. She could feel the toy pressing against her cervix, threatening to push straight through. Her tongue lolled out, drool dripping down her chin. Her eyes were glassy behind the sunglasses.

Octavia’s hooves scrabbled for purchase on the stage. She could feel the dildo inside her twitching, pulsing, alive. The ridges dragged against her g-spot with every tiny movement, and every drag made her vision white out. Her clit was swollen so fat it throbbed painfully, untouched and desperate. She was so full she could barely breathe.

The music pulsed again—another drop, another crash of bass. Both ponies were still seated, still taking the full length, but the stage vibrated under them like a drum.

Vinyl leaned toward Octavia, voice hoarse and filthy. “You good, baby? Can you take the whole thing?”

Octavia’s voice was a whimper. “I—I think I’m about to cum from the stretch alone… but—oh my stars—I want to feel you inside me when we cum… please, Vinyl…”

The crowd chanted their names in rhythm now. “Viny—l! Octa—via! Viny—l! Octa—via!”

Vinyl’s grin was feral. She rolled her hips once, grinding the massive pink dildo deeper, and Octavia’s eyes rolled back again.

“Alright,” Vinyl panted. “On three. We’re gonna ride these bad boys till the audience is beggin’ for more. One… two…”

The lights strobed. The bass dropped out completely for half a second, leaving only the frantic pounding of two heartbeats and the wet, obscene sounds of their stretched pussies.

“THREE!”

Both ponies slammed down at the exact same time.

Vinyl’s scream was the loudest. Her pussy exploded around the pink dildo, walls rippling and fluttering in rhythmic spasms as she took every single inch to the hilt. Her belly bulged obscenely. A thick gush of clear squirt sprayed out around the base of the toy, splattering the crowd’s feet in the front row.

Octavia followed immediately. Her voice cracked into a keening wail that rose above the music. “AHHHH—Vinyl—oh stars I’m cumming—cumming so hard—!” Her pussy clamped down like a vice, milking the toy, squeezing, fluttering, squirting in a steady stream that painted the stage purple. Her eyes rolled completely back, tongue hanging out, drool dripping from her lips. Her ears flattened flat against her head in bliss.

The crowd detonated.

“YES! DROP IT! DROP IT! DROP IT!”
“OH MY GOD THEY’RE BOTH CUMMING—!”
“Viny l and Octa via are fucking each other’s brains out on stage!”

Vinyl’s laugh was broken and breathless as she rode out the orgasm, hips jerking in tiny, uncontrollable thrusts. “That’s it… that’s it, baby… cum for the whole arena… yeah, take every inch—!”

Octavia collapsed forward, forehead resting against Vinyl’s shoulder, still impaled and quivering. Her voice was a hoarse, wrecked whisper against her ear. “I… I love you… so much… that was… that was incredible…”

Vinyl kissed the top of her head, still buried to the hilt in her own dildo, still twitching with aftershocks. She reached down and gave Octavia’s cum-slick pussy a gentle, possessive pat.

“Love you too, Octa,” she murmured, voice raw. “Now let’s do that again on the next drop. The crowd’s still shoutin’ for more.”

The stage lights flashed pink and blue. The bass kicked back in. The audience screamed louder than ever.

And the night was only just beginning.