Rarity's Free Use Day

"Why, hello, Spike!" Rarity called cheerfully, looking up from her sewing as the young dragon stepped shyly into her boutique. "I hope you're feeling well today."

Spike gave a nervous chuckle, rubbing his crest self-consciously. "Sure thing, Rarity," he said. Something about having spent most of the previous night masturbating to vivid fantasies about the elegant unicorn made it hard for him to meet her gaze.

"I assume you're here for..." Rarity's voice trailed silkily as she stood up. Spike blinked. Was he imagining things, or were Rarity's eyes looking strangely big, and soft, and sexy?

"Oh, sure," he began, about to tell her about the errand Twilight had sent him on.

"How marvelous!" she exclaimed, turning away from him. "To be honest, I was rather hoping that you'd stop by."

With that, she knelt forward, flicked her tail out of the way, reached back with her forehooves, and gently spread her bottom to display her tailhole and pussy, gleaming with lubrication and arousal.

Spike's jaw dropped and he sat down heavily, staring in shock at the bounty Rarity was offering.

"Either one is fine, darling," Rarity said sweetly. "Whenever you're ready."

The only sound Spike could make was an incoherent stammering. He looked down and yelped with embarrassment - without realizing it, he had let his erection loose, a hard, pointed pinkish rod dripping with precum and lubrication.

"Rarity!" he finally squeaked, trying to cover himself. "What the clop is going on?"

"It's my day, Spike," she said, a confused tone in her voice. "I thought that was why you'd come. It's my free use day."

"Free use? You mean..."

"It's my civic duty. We mares all take turns making sure that every stallion in Ponyville is thoroughly happy and satisfied," Rarity said. "There are always a few mares scheduled every day. Any stallion can ask for some relief any time today and I'm happy to oblige. Twilight never told you?"

She stood up and turned around to look at him. "I suppose she might not know herself," Rarity mused. "She's a relative newcomer, afterall, and hasn't completely adapted."

Spike couldn't keep himself from imagining Twilight Sparkle's reaction to learning that her five best friends each had an entire day scheduled to entertain a succession of stallions. That morphed almost instantaneously into an image of Twilight herself bent forward with a faceless stallion rutting into her that made him clap his claws to his eyes.

This let his peculiarly-shaped, very wet, and very erect cock stand free, exposed to Rarity's gaze.

Her eyebrows lifted slightly, eyes widening. "Spike! My goodness, but that is a lovely erection! Is that for me?"

He looked at her in stunned silence. She fluttered her eyelashes at him, and he fainted dead away.

A few moments later, Spike opened his eyes and stared around groggily. He remembered...

The events of the past minutes flooded into his brain at the same moment he felt a luscious, warm wetness envelope his cock. The little dragon groaned with pleasure so intense it almost sickened him. He could barely bring himself to look down at the waterfall of purple hair that was gently brushing against his belly as Rarity's head bobbed up and down.

One pretty eye peeked through her mane, and she winked at him.

"Rarity!" he moaned, claws flexing as he resisted the urge to grab her head and force her further down.

She slid her mouth off him with a long slurp and a final quiet pop, smacking her lips.

"You taste lovely, Spikey-Wikey," she said, giving him another quick lick. "Quite different from a stallion."

"W-worse?" he couldn't help asking.

"Different, darling," Rarity replied tolerantly. "Hotter and a bit spicy, almost, but still salty-bittersweet. You don't have quite the same hay undertones as a stallion, but then you don't eat hay, of course."

For some reason, the thought of how many stallion cocks Rarity would have had to suck and how many loads of stallion cum she'd have had to swallow to develop such a discerning palate for sperm made Spike's member twitch even harder.

Sensing his need, Rarity smiled and lowered her head. "I think you've gotten bigger," she said, surprised, before letting her lush lips slip around his cockhead and then further down his rod.

"Am I as big as a stallion?"

Rarity laughed around the cock in her mouth, pulling off again. "Spike, you're an absolutely lovely size, really amazing given how, well, small you are."

"I thought so," he said, half-grumpily. "If there were more girl dragons around here..."

Rarity raised her eyebrows. "Yes?"

Spike cleared his throat uncomfortably. "Sorry. It's just... girl dragons release pheromones that help you, y'know. Grow. Down there. I didn't use to be even this big, before Ember."

Rarity's eyes widened again. "You mean you and Princess Ember...?"

He couldn't keep his mouth from curving up in an almost smug grin. "For days. It was amazing."

"Spike, I'm so proud of you!" Rarity said, giving the tip of his penis a wet kiss. "You're getting so grown up!"

Spike looked down at her with a strange mix of pride, lust, and irritation at how she seemed to still be treating him like a child.

Well. Treating him like a child except that she was enthusiastically sucking his cock with every evidence of enjoyment.

He reached a decision. "Turn around."

His voice was husky but firm. Rarity looked up at him, lights dancing in her eyes, and slowly turned around, raising her hindquarters and swaying her tail coquettishly.

"Yes, Spike?" she said softly.

Spike pulled her tail aside, filled his claws with her bountiful bottom, and leaned in.

That had not been what Rarity expected, and as Spike's thick, strong draconic tongue slithered up and down her soaking wet slit, she almost toppled forward.

"Spike! Oh, Spike! Oh, Celestia!" she squeaked, half-falling forward, raising her rump even more to allow that lovely tongue better access. "Oh, my word!"

The sound of Rarity's unmistakable pleasure gave Spike a thrill of joy. He breathed in deeply, filling his nostrils with her scent, and suddenly he could feel his crest stiffen, feel the expansion running down his body, the same wickedly strong sensation that he remembered from his experience with hoarding.

He breathed her in again and thrust his tongue as far into her pussy as it would go.

Rarity gave a sound that was a mixture of a squeal, a laugh, and a moan, then bit hard on her foreleg to stifle herself. "Oh, Spike!" she said, muffled, but he could hear the mind-blanking lust in her tone and it spurred him on.

Her tail twitched as he pressed the pad of his right paw gently against her clitoris. Then she felt the gentle probing at her tail hole as he explored it with a claw, slowly pressing, feeling the resistance give way.

When Spike's claw finally slid into her ass, Rarity screamed. Her rear legs stiffened, shuddering, as an orgasm pounded through her body like a stampede.

Spike drank her flowing juices down like wine, and as he did he could feel himself growing. His limbs lengthened, his body getting lean and powerful, his muzzle less rounded, his cock...

He looked down and barely recognized the sound of his own rough chuckle as he saw himself.

Rarity looked back, panting and sweating, and as she flipped her mane out of her eyes, bringing Spike's engorged dick into full view, whatever she'd been planning on saying died on her lips.

She collapsed, her hind legs splayed out behind her, pussy still winking prettily out between her thighs.

"Spike, you're magnificent," she managed to breathe out as he loomed above her. There was a glow from her horn and a faint tinkling sound as she magically flipped her shop sign from Open to Closed.

Then Spike gripped her tail in his left claw and the base of his dick in his right, set his pointed tip against Rarity's wet pussy lips, and pushed.

Rarity gave a long, breathless moan as Spike's hard, hot dragon cock filled her up, stretching her entrance and sliding along her inner walls with an irresistible pressure.

Giving in to instinct, Spike nuzzled past her mane and gripped the back of her neck gently with his teeth, drawing a gasp of peculiar pleasure from the unicorn.

"Oh, Celestia! Spike, you're so big!"

Spike grunted in response, giving his hips another push, sliding another few inches inside her and enjoying how her cunt tightened around him.

"Does my scent do as much for you as Princess Ember's?" she asked, turning her head to look as much at him as she could.

He let her neck go for a moment, put his mouth next to her ear.

"More," he growled. Then he took his grip again and Rarity made an indescribable noise as he thrust inside her as deep as he could go.

Her eyes bulged, mouth falling open, as his cockhead seated itself snugly up against her womb and his powerful hips smacked softly against her bottom.

Then he pulled back slightly, rocking his hips, in a series of slow, unstoppable thrusts, and Rarity could feel a tingling in her hooves that reached up her legs and seemed to charge her clit with electricity.

For a second, she teetered on a knife's edge, those slow motions feeding the flames inside her, and then one hard thrust pressed her clit against the smooth, cool floor and a sheet of white lightning flashed in her brain as the orgasm of the century hit her.

Spike, assuming correctly that the sudden flood of nonsensical sounds coming from Rarity's mouth were a positive sign - not to mention the way her pussy was milking his cock for all it was worth - redoubled his efforts. His body was almost a blur as he plowed into the willing unicorn beneath him with all the vigor he could muster.

Rarity's babbling quieted down into the occasional gasp or squeak as the bright sparks of pleasure from Spike's potent, pussy-wrecking thrusts built up behind her eyes, making her as drunk as if she'd been guzzling champagne.

Once she managed to lift her head, her lips wet with saliva, and moan his name, but he could barely hear it over the rhythmic, liquid sound of fucking that filled the room.

When he said her name, though, it was almost a roar, vibrating through her body and sending fresh tingles up and down her skin.

"I'm going to..." he panted, his cock twitching with each push, and she gave a giddy, fuck-drunk acceptance.

His balls tightened, his cock pulsing, as jet after jet of volcanic dragon semen gushed out inside her. It was hot and thick and liquid and she could feel every drop as Spike let out years of frustrated lust out in one massive orgasm.

It pulsed into her over and over until she almost laughed at the sheer volume. There was so much that she was suddenly convinced that it was going to round out her tummy as if she was pregnant.

Could she get pregnant from dragon cum? Dragons and unicorns were both, after all, very magical creatures. The thought popped in her head like a bubble.

"Knock me up, Spike!" she cried. "Put a baby dragon in me!"

He laughed aloud and gripped her hips, flipping her over so she was staring up starry-eyed at him as he leaned in and held her close, fucking her slowly, his massive cock still shooting spurts of powerful sperm into her belly.

She sobbed from the sheer pleasure of it, her mascara running down her cheeks as she rode the waves of her climax.

Spike looked down, concerned at her tears. Slowly he pulled out of her clasping, orgasming cunt, and she whined at the sudden emptiness.

His prick shivered and squirted another hot line of cum over her belly, and the same thought hit them both at the same time. He crawled forward and she lifted her head, suckling happily on the tip of his cock as a seemingly endless flow of semen ran down her throat.

After a few minutes, Spike couldn't take it anymore, his penis hypersensitive, and he pulled away. A few last jets splattered Rarity's face and hair, and she smiled as elegantly as she could under the circumstances - splayed out on the floor, filled and covered with cum, fucked into orgasmic exhaustion by a gigantic dragon cock.

"Spike, that was simply amazing, darling," she panted.

He looked down at her, and his still half-erect dick began to expand again.

"You help anyone who needs relief today, right?" he said, sliding his claws up her thighs.

Rarity's eyes locked on Spike's - hers wide and sparkling, his hot with renewed lust - and she mewled as she felt a claw sliding into her asshole.

"I think I still need relief," he said in a low growl. "And I got here first."

She was about to beg for a break, but then his tongue was in her mouth and his huge body was aganist her, and she felt her legs wrapping instinctively around him as his erection prodded at her tail hole.

"Oh, SPIKE!" she cried as he started to fill her ass with his cock.

She wasn't going to be servicing any stallions today, that was for sure. And as the strange, sharp pleasure of being buttfucked started to reignite the banked fires inside her, that seemed somehow perfect.