"Gee, Spike!" Twilight giggled, impossibly loud and yet so far away. "You don't look so hot. You sure you want to keep playing?"

"Uuuunh," Spike groaned. The world seemed to swim around him, or maybe that was just the cum in his eyes. He was barely standing on both feet by this point, and the sweltering heat of Twilight's arousal didn't help. Tough as a dragon was, there was only so much he could handle before falling over. "No, I gotta..."

It was more than a matter of pride at this point. He did want to take a game off Twilight and finally show her who was top dragon around here, but if he didn't keep playing... He gave Twilight's massive, dripping vagina a good up-and-down look. By Celestia, it looked big enough to eat a full-grown dragon. How was he supposed to compete when he wouldn't even qualify as a snack?

No! He shook his head. If he didn't keep playing, there was a very real chance that he'd be this small for a very long time — if not forever. So long as there was even the faintest chance he could win, he had to keep trying.

Still. He shuddered as a long, thick line of drool ran from Twilight's quivering lips, big enough for him to drown in. It honestly did seem like the faintest chance.  

"Tell you what, Spike," said Twilight, her tone positively dripping with smugness. "I've been on a pretty dominant winning streak, so I think we should amend the rules. We can't keep playing games forever, right? So how about we make this the last game and I'll grow you back either way. No change for your prize if you win, but if I win..." Her pussy gave him a playful wink, open and shut. "If I win, you'll have to keep me 'entertained' while I work on your antidote. Sound like a deal?"

Spike took a second to think about that. On the one claw, he didn't even want to imagine the consequences of losing and being forced to 'entertain' Twilight. On the other claw, what was the alternative? Losing game after game until Twilight got bored? He winced, thinking back to the crushing weight of a single Twilight tit, now the size of a mountain. He definitely wouldn't survive if he kept playing games.

And how long would it take for her to make an antidote anyway? This was Twilight Sparkle. She could probably brew up a new potion in under five minutes. Even if he lost, he wouldn't have to suffer all that long, and if — if — he won...

A grin crept slowly onto Spike's face. Now it could be for pride. Oh, the payback he'd get once he'd won this last game. If he won it. "Alright, deal!" he shouted up to her. "What's the game?"

"Spelunking!" Twilight said brightly. Of course. "Five-minute time limit. You're going deeeep inside me this time."

"A-and what?" Spike asked. Make her orgasm? That... that would actually work! Twilight was so obviously on the edge that even at his size he could bring her over. So long as he didn't die in there, he could do it! "Wait, let me guess," he said, trying not to sound too obvious. "I have to make you cum, right?"

"Nope!" Twilight said happily. "Just the opposite. You have to make sure I don't cum." Even without a good look at her face, he could practically see Twilight trying to stifle her laughter. "I'm giving you the advantage here, Spike. You're so small now, I'll hardly even feel you!"

"I don't know if that makes me feel better," he said. Twilight's pussy winked again, giving him a sneak peek of the cavern deeper in. Being so small would definitely be an advantage in the game, but it'd also make it all the more likely for him to get lost in Twilight's 'cave,' never to be seen again.

A thought struck him. "Hey!" he called up to her. "If I do this, that means you play fair this time! No masturbating while I'm in there!"

"Scout's... mmm, scout's honor, Spike!" Twilight said, absently fondling one of her tits. "It's not like I'd need to. The thought of my little troublemaker in there is aaaaall I'll need."

"O-okay then." Spike blushed. That wasn't entirely what he'd expected her to say, but so long as she played by the rules this time, there wasn't much he could argue. "Ready, I guess?"

"I sure hope so!" Twilight laughed.

Her colossal hand dropped down behind him and pushed him slowly toward the awaiting cave. "H-hey!" he shouted. He tried to push back, but his feet instantly slipped on a slick trail of Twilight cum, and her hand slid him ever closer to her titanic pussy. She pressed him up against her folds and fresh globules of piping-hot marecum dripped down on him from above. "Don't I get to choose when we start?"

"Nope!" And with that, a column-like finger shoved him in.

The rush wasn't too far off from a water slide, if water slides could squeeze him to death. Spike tried to grab hold of Twilight's finger as it retracted, but her undulating walls gripped him tight and the finger slid out without him, leaving him trapped alone in the darkness. Not that he could see anyway. Her juices were so thick and copious inside her that he had to keep his eyes permanently shut, lest he go blind. The only reminder he was even still alive was the thump-thump-thump of Twilight's heart above him, slow at first, but quickly building speed.

"Okay, okay," he whispered. He took a deep breath, trying to suck as much oxygen as he could from the humid atmosphere. "No need to worry. She can't get off if I just don't do anything."

He curled up into a ball and held still, careful not to rock the boat. For just a fleeting moment, he was able to believe he could wait out the game — right before Twilight's walls squeezed him like a fist.

"Tsk, tsk, Spike!" Twilight's voice thrummed around him. "That's not in the spirit of the game at all. You're going to play with me, one way or another."

Shit! Of course. He'd been smart enough to set masturbation off-limits, but that didn't even cut out half of the ways Twilight could screw with him. Twilight's pussy, already a tight enough space, contracted in another crushing squeeze, forcing him to scramble for safety.

"Ahhhh," Twilight groaned as he slid over her sensitive walls. The death-squeeze relented — for the moment. "Now you're getting it, Spike."

Shit, shit, shit! What was he supposed to do? He couldn't stay still, or Twilight would squeeze him into action. He couldn't keep moving, or Twilight would most certainly orgasm. The only thing he could think of was to ruin the moment for her. Enough pain to cut through the pleasure.

"Here goes," he muttered, extending his claws. He bit and scratched at every available inch of Twilight's pussy as he tumbled through, spinning like a roaring tornado of death. It was hard to find purchase on the slick muscle, and he bit more often at mouthfuls of sticky marecum more than he did Twilight, but he liked to think she could feel what he was doing up there.

And did she ever. "Ah... ah... Allllmost there!" The tremors immediately kicked into overdrive, and her pussy flooded quickly with more juices than ever before. "Y-you're not very good at this game, huh, Spike?"

It was all Spike could do to not break down and cry. Everything he did just turned her on further! Not even in this, her most sensitive of places, was he big enough to do anything that Twilight wouldn't feel like a finger over her clit!

Except one thing. One final trick he'd been holding up his sleeve. "Alright, Twilight!" he shouted, vaguely aware that she couldn't even hear him. "You asked for it!" He climbed to something approximating an even footing — or as even as it got in Twilight's undulating cunt — and took a deep breath. The deepest breath. And when he'd inhaled all he could possibly inhale, foul, musty, and thick as the air was, he let it all loose in a mighty gout of flame.

Twilight screamed.

The walls clenched.

And all hell broke loose.

"Whew!" Twilight panted, feeling almost lightheaded in the afterglow of her orgasm. "I don't know what you did, Spike, but that was incredible." She leaned over to look at the itty bitty dragon, waterlogged in a puddle of her fluids. "Do I need to say that you lost?"

"I..." He staggered to his feet and raised up a claw. "I surrender. I'm sorry, Twilight. I should've listened to you when you told me not to drink your potions."

"Aaand?"

"And..." His voice dropped to a low mumble. "And I promise to listen to you more from now on."

"Good enough for me!" She picked him up and gave him a good lick-off to clean the marinade of her own juices. "So, now that I'm properly de-stressed, I think I should get to work on that antidote I promised you."

Spike's face instantly brightened. "Wow, Twilight! Really? Right now?"

"Of course!" She slid on her bra and reconnected the clasp. "I'm a mare of my word. Win or lose, I'm going to get you back to normal size. But speaking of..." She grinned. "I did win, so you're going to have to provide the entertainment while I work on it."

"Pft," Spike snorted, a tiny jet of green flame erupting from his nostrils. "Okay, fine. So, what, I have to get you off for another five minutes while you make me an antidote? Whatever. No problem."

She did so love bursting his hot air balloon. "Who said it'd take that long? Given all the potions you tipped over and the interaction effects, it'll take me at least three days to figure out the proper antidote. Plenty of time to keep me company."

Twilight stifled a giggle as Spike's jaw dropped. "N-n-no! P-please!"

"You still have a lot of lessons to learn," she said as she stuffed Spike into her bra, pinned between the fabric and her fat, swollen nipple. "Better get to it!"

And with that, she gave a cheery whistle as she sauntered over to the door, and made her way slowly downstairs.