Cadance straddled Shining, with both legs pushed outward against the mattress. Her forehooves pushed down against his muscular chest, her body just far enough forward for his engorged shaft to press against her belly. Below, her swollen marehood, slick and burning with arousal, rubbed gently against the fur of his thighs, leaving him stained with her arousal.

Shining grunted as Cadance’s hoof curled around his shaft. At sixteen inches long, it had long been his pride and joy - and Cadance’s as well. Paired with a hefty pair of nuts that would often smack against his thighs as he walked, his stallionhood had always seemed impressively virile. Tonight, it was doubly so.

“Geeze, Cadance,” he groaned, drawing in a shuddering breath. “Y-you’re gonna make me cum like this. I already feel...nggh. So full. So hard.”

Cadance rubbed Shining’s shaft in long, steady strokes. Rivers of precum, far more than any normal stallion should be able to put out, streamed down the sides of her hoof. Between her legs, she could feel the taut, round curve of his ballsack, swollen up with extra seed until both nuts were larger than grapefruits, rubbing up against her dripping cunny. “Oh, no, Shiny,” she teased, caressing a vein rubbing up his shaft. “The spell won’t let you until I say so. And until I’ve got you all the way inside of me - “

She squeezed his engorged shaft. Hard. Shining gasped for breath. His hips jerked, thrusting his cock forward with the familiar frenzy of orgasm -

 - even as his cock remained completely dry.

Cadance’s lip curled as Shining whimpered beneath her. “ - you’re not going to cum a single drop.”

“Come on, Cadance,” Shining begged. “You’ve been teasing me for nearly ten minutes already. I feel like my balls are going to burst. I - I’ll be hard again soon, I promise.”

“Nuh-uh.” Cadance gave Shining’s swollen nuts a playful tap. He moaned, his cock splurting out a good tablespoon’s worth of precum all over his matted, messy chest. “You’re going to save up all of that fresh, virile seed for me, big boy.”

With a grunt, she heaved herself up into the air. Shining grunted at the sudden lack of pressure on his thigh - and then moaned, wavering and high-pitched, as she slowly lowered herself down on top of him. Cadance sighed with pleasure, rubbing her middle as her velvety folds welcomed the familiar presence of Shining’s fat cock, his engorged, throbbing member smearing her inner walls with copious amounts of pre as she pulled it deeper inside.

Shining’s eyes rolled back; his hips spasming again, his cock flared inside of her, his thick head scraping against her dripping walls. Once more, though, not a drop of jizz escaped his drooling urethra. Instead, Cadance only felt her vagina loosen, her walls clenching and relaxing in succession as she welcomed each new inch of girth that Shining’s reflexive thrusts pushed into her.

Between her back legs, she could feel Shining’s balls swelling up even larger. Those plump, squishy orbs churned with fresh, unspent seed, their virile contents increasing in volume with every squeaked, strangled grunt of Shining’s failed orgasm. Cadance leered down at him as she continued to lower herself down, caressing his muscular chest between her hooves. “Mmff. Now there’s a big stallion. Can’t say I’ve ever seen balls that big.”

She tightened her thick, luscious thighs around them, feeling their contents sloshing against her perfect legs. Shining gave a strangled moaned.

“C-cadance,” he groaned. “Oh, Cadance, they’re just so full.”

“Not full enough,” she said, licking her lips. “I think you can be bigger. You’re going to have to get me real big, after all.” She giggled at that, and patted her belly again. She could already envision her middle growing taut and round, bulging with new life as Shining’s offspring grew inside of her.

She began to ride him, her marehood pumping up and down the sides of his spasming shaft. Shining gripped her flanks hard, his hooves squishing into her ample, soft cheeks. Cadance bit her lip as he rubbed her Cutie Marks, and made sure to clench her dripping cunt around his tool on her next descent. He moaned, long and throaty, and a satisfied smirk crossed her face.

Up and down she went, pumping up and down like a piston. Sweat dripped down her forehead as the sounds of smacking, sweaty flesh filled the room. Shining’s cute little cries were like music to her ears; his little squirms, his twists, his cries of muffled pleasure and unfulfilled lust were absolute honey to her senses.

On and on Shining’s balls swelled up, growing further with the magic of Cadance’s spell and their own unspent spunk. Shining moaned helplessly, his legs pushing further apart as his massive balls approached the size of cantaloupes. So full. So big, so tight, so absolutely stuffed with cum. Cadance licked her lips, her chest heaving.

“You like that, Shiny?” she murmured, chewing on the inside of her cheek. He twisted beneath her, his hips jerking and flexing with orgasm after failed orgasm. The touch of his enormous, plump nuts to her behind lit her arousal like a blazing spark. To know her stallion had become so masculine, so virile, so ready to breed her. His cock was rock-hard inside of her, the constant flood of precum into her cunt enough to start making her belly swell outward, even as cascades of milky-white pre gushed down onto the bed around his throbbing shaft. “You like being full enough to fill your mare properly?”

“P-please,” Shining said beneath her. “I-I’m inside you now. Oh, please let me cum, Caddy.”

Her smirk twitched. “Not yet, my cute little stud.” She massaged his shoulders as she went up and down atop his stallionhood, groaning with satisfaction as his tool thrust deeper and deeper inside of her. “You’re going to get so big that we’ll be certain that you’ll fill me up right. You’re going to get my belly so big with your jizz that there won’t be a chance that I won’t get pregnant from it. I’m going to feel your hot seed rushing inside of me - “

Shining moaned beneath her, twisting helplessly in her grasp.

“ - and in the morning, I’m going to be filled with your babies.” Cadance licked her lips, a determined, blazing look in her eyes. “Full of your foals, Shining. And they’re going to grow inside of me, getting bigger each day - but never quite as big as when their daddy pumped me full of enough cum to fill a cider barrel.”

Shining whimpered. One hoof prodded weakly at her belly, which was already sloshing with his copious precum. “P-please,” he begged. “Cadance. They’re so full.”

That they were. Big and round and plump and full, stuffed full of more seed than Cadance had even thought possible. She continued to ride him, though, and even slowed her thrusts, milking each slide of her lips against his shaft to make it as torturous as she could. “You’ll cum exactly when I want you to, honey,” she purred, rubbing his chest softly. Shining whimpered again. “Once you know just who your mare is.”

He blinked weakly up at her. “Y-you?” he slurred.

She pulled his hoof to her belly, pushing him to feel the curve of his throbbing stallionhood in her cunt. “Me,” she echoed, smiling. “And who’s me good little colt?”

Before he could answer, she added, with surprising intensity “Who’s going to make me lots of foals? Pump me full of your cum? Who’s going to leave me sloshing and full and bloated with your children?”

He clenched his teeth, and groaned. “M-me?”

Cadance’s smile widened.

“You.”

And she released the spell.

Shining’s hips bucked mightily - and he came. A huge orgasm rocked his engorged, rock-hard cock inside of her, and a tsunami of cum came flooding out into her cunt. Waves of hot, thick jizz crashed against Cadance’s spasming insides, his tool throbbing and lurching as it pumped her full of cum. Cadance moaned, pressing his hoof harder against her belly as she felt it swell with his load. She grunted, squeezing her eyes shut and clenching around his spasming shaft as if to milk every single drop from his huge, overstuffed cum-orbs. Shining writhed, jerked, twisted beneath her as he continued to flood her womb full of his spunk.

Cadance moaned along with him, their voices mixing in a chorus of pleasure. She felt her belly growing larger, rounder, and imagined foals growing in her womb, their little limbs pushing outward, growing bigger and forcing her even bigger with each passing day. The ocean of jizz continued to rush inside of her, Shining’s impossibly prolific orgasm fueled by his melon-sized nuts, bulging her belly larger with his seed by the second.

With a shuddering sigh, she collapsed atop Shining’s chest. He sucked in a greedy breath, his pre-spattered chest heaving beneath her as her cum-bloated belly squished against his.

He exhaled slowly, nuzzled against her cheek. “H-how was that?” he murmured, taking another deep breath. His shaft twitched inside of her, a final splurt of spunk splattering into the near-gallon of jizz bloating her gut.

Cadance smiled, and nuzzled him in return. “I’m sure,” she whispered, stroking his chest gently. She hummed quietly to herself, rocking her hips from side to side, and feeling his seed slosh inside of her. She thought she could already feel a foal kicking.