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.

In the shattered heart of the Dark Castle, where jagged spires pierced a blood-red sky and the air thrummed with residual mana storms, Mondoragon’s colossal form dominated the ruined throne hall. His ridged dragon cock—thick as an ancient pillar, longer than Belladonna’s entire body, and scaled with protruding ridges that promised exquisite ruin—was already buried to the hilt inside her stretched, clenching pussy. The demoness, in her true feline beast form, was impaled upon him like a living trophy, her lithe purple-furred body arched in a bow of pure, overwhelmed ecstasy, her claws scraping uselessly against the burning heat of his underbelly scales.

Each slow, deliberate thrust rocked the foundations of the castle. Stone dust rained down around them as his hips rolled forward, forcing another impossible inch deeper, the ridges dragging along her inner walls with wet, obscene pops. Belladonna’s orange-red eyes were rolled back, only slivers of glowing iris visible, her fanged mouth open in a continuous, broken yowl that echoed through the cavernous hall. Drool spilled from her lolling tongue, mixing with the rivulets of her own juices that squirted in rhythmic gushes each time a ridge breached her entrance anew.

“F-fuck—too much—too fucking big—” she gasped, voice ragged, yet her hips ground down greedily to meet every thrust, her tail lashing wildly against his scaled thigh. The size difference was obscene, intoxicating: her entire torso rose and fell along his shaft like a sleeve, her belly distending visibly with the outline of his cockhead pushing up beneath her ribs. His giant balls—each one larger than her head, heavy and sloshing audibly with pent-up seed—slapped wetly against her ass and tailbase with every downward motion, the impacts sending jolts through her entire frame.

Mondoragon’s rumble vibrated through his length and into her core, a bass growl that made her clit throb in time with his heartbeat. “You take it so greedily, little kitten,” he snarled, voice like grinding boulders. Hot breath washed over her back as his massive head lowered, forked tongue flicking out to taste the sweat-matted fur along her spine. The tongue alone was thicker than her arm, rasping over her skin and leaving trails of sizzling saliva that heightened every nerve. “Your cunt milks me like it was made for dragon cock. Bigger than your precious Dark Majesty ever dreamed, isn’t it?”

Belladonna’s ears flattened at the taunt, but the treacherous moan that tore from her throat betrayed her. Yes—gods, yes—he was bigger. Her lord’s shaft had been impressive, a dark, veined rod that had claimed her countless times in Mavolia’s depths, but this… this monstrous ridged pillar split her open in ways that rewrote her very senses. Every ridge scraped a new spot inside her, igniting sparks that built into infernos. She could feel her demonic body stretching, adapting, magic and lust conspiring to let her take more than should have been possible.

She twisted her upper body, claws raking harmlessly over his chest scales, and craned her neck to glare up at him through pleasure-hazed eyes. “Shut up and fuck me harder, you arrogant lizard,” she hissed, even as her walls clenched around him in desperate need. “Prove you’re worth betraying him for.”

Mondoragon’s wings unfurled with a thunderous snap, casting swirling gusts of hot air that whipped her fur and sent loose debris skittering across the floor. He obliged. His hindquarters surged forward in a brutal rhythm, each thrust lifting her entire body off the ground before slamming her back down, impaling her anew. The wet, rhythmic slap of scales on fur filled the hall, underscored by the constant squelch of her soaked pussy struggling to accommodate his girth. Her breasts bounced wildly, nipples hard and aching as they dragged across his heated scales; every ridge that popped free of her entrance sprayed a fresh gush of her arousal across his balls, coating them in glistening sheen.

Time lost meaning. There was only the endless cycle of withdrawal and penetration, the burn of stretch giving way to blinding pleasure, the overwhelming scent of their mingled musk—his brimstone and fire, her sweet demonic nectar—thick enough to taste on every panting breath. Belladonna’s voice grew hoarse from screaming, her body trembling through climax after climax, each one ripping through her like lightning. Her juices formed a growing puddle beneath them, steaming on the cold stone. Yet Mondoragon showed no sign of tiring; his cock throbbed harder, ridges swelling slightly with building pressure, precum leaking in thick rivulets that mixed with her cream and eased the way for even deeper thrusts.

He shifted suddenly, massive foreclaws gripping the broken dais for leverage as he angled his hips higher. The new position drove his cockhead against her deepest barrier, pressing insistently until—with a wet, yielding pop—it pushed past, seating fully inside her womb. Belladonna’s scream pitched into a shriek of pure overwhelmed ecstasy, her vision whiting out as another orgasm crashed over her, stronger than the last. Her entire body convulsed, walls rippling in frantic waves, trying desperately to milk the invader that now claimed her completely.

“Feel that, kitten?” Mondoragon growled, voice rough with restraint. His tail coiled around her waist, holding her immobile as he ground in slow, merciless circles, stirring her insides. “Every inch. Every ridge. You’re mine now—stretched and ruined for anyone else.”

“Y-yes—fuck—yours—” The admission tore from her lips unbidden, her pride crumbling under the onslaught. She reached back with trembling paws, gripping the base of his shaft where it emerged from her ruined entrance—her fingers couldn’t even span half its circumference—and stroked frantically, urging him deeper. Her other paw slipped between her thighs, rubbing her swollen clit in frantic circles, chasing yet another peak.

Hours blurred into a haze of sensation. Mondoragon varied his pace—slow, grinding rolls that made her feel every textured inch, then sudden savage thrusts that lifted her clear off him before slamming her back down. He used his tail to manipulate her body like a toy, angling her to take him from new directions, forcing her to feel ridges drag across untouched spots. His tongue bathed her back, her breasts, even curling around to tease her clit when he pulled her upward. The constant sloshing of his balls grew louder, heavier, the orbs swelling visibly with backlog as climax approached but was endlessly delayed.

Belladonna lost count of her orgasms. Her voice was reduced to whimpers and broken pleas, her body limp and pliant in his grip, held up only by his tail and the cock spearing her. Yet still she craved more, hips twitching instinctively, inner muscles fluttering in constant invitation.

Finally, after what felt like an eternity of exquisite torment, Mondoragon’s rhythm faltered. His thrusts grew erratic, deeper, harder—each one bottoming out with a wet slap that echoed like thunder. His wings beat once, twice, fanning furnace-hot wind across her sweat-soaked fur. A guttural roar began low in his chest, building, vibrating through his cock and into her core.

“Take it—all of it—” he bellowed, head rearing back, horns scraping the vaulted ceiling.

The climax hit like a cataclysm.

His balls contracted violently, pumping with audible force. The first jet of dragon seed erupted into her womb with such pressure that her belly rounded instantly, swelling like a balloon. Rope after thick, scalding rope followed, each pulse forcing more cum into her already overfilled depths until it jetted back out around his shaft in creamy geysers, splattering the floor in steaming pools. Belladonna’s final orgasm detonated in response—her vision went black, every muscle seizing as pleasure bordering on pain ripped through her. She screamed until her voice gave out, squirting in endless arcs that mixed with his overflowing seed.

The flood continued for minutes—gallons of thick, molten cum filling her, bloating her belly until it pressed against his underbelly, then bursting free in rhythmic surges with every heartbeat. The scent was overwhelming, the heat branding, the wet sounds of overflow endless.

When at last the torrent slowed to thick, lazy pulses, Mondoragon remained buried deep, his ridges still twitching inside her ruined, cum-stuffed pussy. Belladonna hung limp in his tail’s grip, fur matted, body trembling with aftershocks, utterly claimed.

In the sudden quiet, broken only by their ragged breathing and the slow drip of excess seed, she managed a weak, sated purr.

“Again… soon…” [/story]