Tia's Troubles

"Princess Celestia!"

Here she was in all her glory. She was very much dressed down for the occasion, with a simple white tee and jogging pants. Not very regal, she admitted to herself, but she very much hoped that this would prevent attention being drawn to herself. It did for a time, but when passers-by realised who she was and how much she had changed, all they could do was stare. Whether she was coming or going her body was a sight to behold, not least in casual wear that offered little support and let her assets bounce around unhindered.

With her last growth spurt brought on by Luna, even her baggiest clothes clung lewdly to her expansive curves. After ripping her last pair of yoga pants while exercising in the gym, she moved up another two sizes just to be safe. But now, even those couldn't fully contain her monstrous booty, and a little bit of butt cleavage spilled over the waist band. Her huge hips, now 61 inches around, and 28 inch thunder thighs tested their strength too. It had taken her nearly a minute just to get these pants on at all; she had to get a firm grip on each side and tug them up and over the gigantic projection of her globular ass that proudly stood out a foot and a half from her back. Despite its size it hadn't lost any sensitivity. She could feel it wobble and sway with each step she took. Every hundred yards or so she had to stop and yank her pants back up as her ass would keep trying to escape from its cloth prison. She was also still unintentionally masturbating when she walked as her bulging thighs pushed the material of her pants against her oversized clit with every step.

Ever since her most recent growth spurt her libido had been on a hair trigger. On her way out of the castle to visit Twilight, Luna slapped her rear as she walked past and she nearly came!

"How do you even fit that fat ass in anything?"

"Do you want me to sit on you again?"

Luna gave the soft flesh of her sister's giant butt cheek a good squeeze, eliciting a quiet moan from her.

"Actually I'd love to have this thing on top of me again."

"Oh, I'm sure you would. Maybe later, I have to see Twilight."

She kissed Luna on the lips and then made her way down the corridor.

"Don't try sitting on her, she's only little! She might get lost in that thing!"

Celestia turned and furrowed her brow in mock offence, suppressing a laugh.

"You'll pay for that later!"

Spike hungrily eyed all 7 foot 3 of her and felt his heart rate rise, globs of pre streaming down his rod of steel. He couldn't wait to blow a huge load all over her.

It was obvious that she had grown quite substantially, as her 3XL shirt barely covered her navel, her enormous jugs contained inside an equally enormous red bra that showed through the thinly stretched fabric of her top. If she puffed out her chest her weapons of mass destruction would likely tear it open.

Twilight knelt and attempted to bow down but her oversized tits squished against her knee and got in the way. Celestia had to admit that it wasn't every day she met with a naked, cum-covered subject, but it didn't strike her as something she wouldn't want to experience again. Spike sat up and was going to do the same as a Twilight but Celestia stopped him.

"Thank you Spike, but I can see you're already standing to attention."

Indeed, his two-foot dick had fully re-inflated at the sight of the super-voluptuous, beautiful sun goddess. He hadn't seen her for some time and it came as a very sexy shock to see how... big she had gotten. Celestia, in turn, was taken aback by the size of him and Twilight.

"Looks like you two had a good time. Have you always been this big?"

She enclosed a hand around Spike's pole, which by now was flying proudly at full mast once more, and applied pressure.

"Hnnhhh... N-no, your majesty."

She relinquished her iron grip and wiped up the pre bubbling from the tip. Like her own milk as of late, it was a striking alabaster white and almost seemed to glow. She sucked the glob off her finger and appreciated the flavour and texture like she would a fine wine.

She swallowed, and enjoyed the sensation of the velvety cream rolling down her throat. Almost immediately her nipples hardened and distended slightly. She stared wide-eyed at the protrusions in her shirt, then back up at Spike and Twilight.

"Heavens, what did I just swallow?"

Twilight stood up, her boobs wobbling back into place.

"We think, your majesty, that this all has something to do with that hyper-fertility you told me about. It made me bigger, and as you can see, I passed something along to Spike. I consumed some of his... uh, semen... in the hope of replicating this effect in myself. For science, of course."

"And so you can fit my dick inside yourself."

"Yes, that too, Spike."

Celestia sat on the bed beside him.

"I see. I wonder if I could also provide him with a little extra mass."

She grasped his length again and slowly raised and lowered her fist along it. The feeling of his foreskin bunching up and rubbing against his head was eye-wateringly pleasurable. What a day this had been, not only had he grown a huge dick but princess Celestia was jacking him off!

"Gonna.... cum..."

"Gosh, so soon? I'd better stop, we don't want you blowing before we've had a bit of fun!"

She retracted her hand and began to lift her shirt off. Slowly but surely her vast chest was revealed, two pumpkin-sized orbs of flawless, supple flesh trying to force their way out of an undersized M-cup bra. Flesh was oozing out everywhere; underneath, along the top and out of the sides. Spike couldn't decide whether he'd rather motorboat them or paint them white. He'd have to wait, though, because they were interrupted by Twilight.

"Uh, I think something's happening."

They both looked over at Twilight, naked except for her purple panties, cradling her big bosom in her hands. It seemed Spike's supercharged load Twilight had guzzled down was now taking effect. Celestia shuffled back and sat against the headboard beside Spike, nonchalantly playing with his junk.

"Now this I must see."

Twilight was a little embarrassed by the fact she had an audience, but any feelings other than lust and pleasure soon dissipated as the sensation in her chest peaked. She gritted her teeth as her areola swelled and her nipples distended, doubling and then tripling in size. She began to creep upwards in height, the floor creaking as her weight increased. She looked over her shoulder to see her ass cheeks growing and extending out from her back. She widened her stance as her thigh gap disappeared, filled with soft flesh, and her hips rounded out into near semi-circles.

"Fuck, that's hot."

Celestia had been idly stroking Spike's dick as she watched the show. Her other hand had disappeared between her thighs as she slowly fisted herself. By now Twilight's tits had reached her navel and looked fit to burst. The only thing holding back the flood of milk was her nipples, and they wouldn't stay closed for long with the weight of her payload pushing against them. She felt the tension in the room rise as Twilight leaned back against the wall to support herself, moaning almost nonstop as the inevitable climax approached. Celestia turned to Spike and they gazed at one another briefly before looking back at the groaning Twilight.

"Shit! Oh shit, shit, shit!"

Reflexively she compressed her grip against her teats as they reached maximum capacity. Celestia grinned.

"Here we go."

Suddenly the flood gates opened. Twilight's six inch-long nipples opened wide and unleashed a salvo of cream that splattered against her two companions, the bed, and the wall above them. Both Celestia and Spike caught several mouthfuls of the divine nectar as Twilight blasted them again and again.

"Mmnn... Fuuuuuck yessss......"

Twilight continued spurting out jets of cream, head tilted back, eyes closed, her face a picture of sheer bliss. She felt like she was cumming from her nipples, and that wasn't far from reality. The feeling was too much. She cried out as she orgasmed, spurts of femcum running down her legs and pooling at her feet. After three minutes, the gushing jets began to weaken. The streams drew closer and closer to their source before they became a trickle, then silence fell as the last droplets of milk dripped onto the carpet.

The area in front of her had become a sea of white. Thick, creamy milk coated most of the far wall, not to mention the two dripping figures on the bed. Spike licked his fingers clean.

"That... was awesome."

Physically drained, Twilight slid down into her knees and the weight of her breasts pulled her forward. They broke her fall and spread out across the floor, she put her arms down either side of them, smiling.

What they didn't know was they were creating a feedback loop inside themselves. Each time a hyper-fertile substance was ingested, then expelled and ingested by someone else imbued with hyper-fertility, its potency doubled when it was expelled again, a quirk designed to help rapid repopulation with very few individuals. Spike was about to learn this first-hand.

"And you think I put out, that was crazy!"

"Spike's right, that was incredible."

Twilight replied, her voice muffled by the carpet.

"I came so fucking hard."

Feeling a little more stable, she rolled over and sat up. She cupped her big bazongas in her hands and giggled.

"I could get used to these."

Spike noticed he was getting harder. But not just that, he was getting bigger too.

"Looks like you're making me bigger again Twilight. Fuck, I wanna cum so bad."

As he groaned his cock began to distend and lengthen. His balls churned and fattened as they grew even larger, filling up with what would be a truly epic load. In one long, agonisingly pleasurable spurt his cock grew past the three foot mark and began to tilt towards him under its own weight. Soon he'd be able to suck himself off. His body tried to keep up but it was clear that his cock would be disproportionately large, like the boobs on Celestia and Twilight. They were essentially turning into living, breathing sex machines so it made sense.

As Spike's muscles filled out he began to resemble a very well-built bodybuilder, with well-defined abs, thick slabs of meat for pecs and muscles bulging up wherever there was space for them. As his biceps reached 23 inches around it began to get difficult to bend his arms, but his strength was immense. He was worried that if he got a little too rowdy while jerking off he'd hurt himself but as he watched the length and girth of his member increase it seemed less and less of a problem. As his second growth spurt wound down, his dick stopped at just over four feet in length, and he was nine feet tall. Now his legs below the knee hung over the end of the bed and his feet almost touch the floor. His fully-boned cock would brush against his ankles if he could manage to bend it down that far, but it was far more inclined to point the other way. The angry pink head was now staring him in the face, the seemingly constant trickle of pre gathering between his pecs. he could just about lick the tip with his tongue, and considering the size of his pectorals he could probably get himself off between them.

"Jeez, I feel like I'm gonna blow any minute. This pre won't stop."

Twilight could see that his huge, taut basketball-sized testes resting against his thick muscular thighs were very turgid and practically full to capacity.

"I'm not surprised," declared Celestia, "you look fit to burst down there. With the load in those balls you could fill a five-gallon bucket. Actually, I think I could too."

She looked down at her chest; Twilight had made her grow too. In all the excitement she hadn't taken her bra off and her jugs had ploughed straight through them, the tattered remains lying either side of her. She was ten feet tall now, but just like Spike, her body wasn't in proportion, her boobs covered her upper torso and she struggled to bring her hands together in front of them. They were still very soft, if anything they'd become softer, and she could push her hands into them as if they were made of memory foam. She could feel the milk inside them as she rolled the flesh across her hands. Her hips were wider than ever, one was pushing against Spike and the other was hanging over the side of the bed. Twilight moved towards them, hips swaying and boobs bouncing.

"You both look incredible... but I have to get my hands on that dick."

As she put a knee down on the bed, the inevitable happened; her bed finally gave up and collapsed under the weight of the three huge friends. Luckily the floor beneath didn't give way too. They all burst out laughing, and adjusted to the lower perspective. Twilight wasted no time and got back to her objective: Spike's pork sword.

"Dammit Spike, you're too big again, when am I gonna get to ride this thing?"

"Hey, it was your decision to aim your tits at us!"

Celestia laughed and stood up.

"Sorry Twilight, looks like he's a little too big for you. But I think I'm just the right size for him. No hard feelings."

She gave Twilight a consolatory peck on the lips which quickly turned into a full-blown French kiss, they really had become slaves to desire.

Spike, meanwhile, got his first real look at Celestia's ass as she stood in front of him and made out with Twilight. The only word he could think of to describe it was huge. It must have been a metre across and stuck out from her back at least half that distance. Her hips seemed outrageously wide from the front, but now he saw why: they framed a truly colossal butt. It was amazing how rounded the cheeks were, her rear resembled a toned bubble butt, but meatier, wider and on a much larger scale.

Each cheek seemed to push against the other in the fight for space, and there was an obvious cleft where her thick thighs met the underside of her rear. Even better, Twilight's hands had made their way down to it, and Spike had a front-row view of this perfect ass being kneaded and groped. It was almost too perfect the way the mass of flesh flowed in her grip and spilled out between her fingers. He was so turned on that he nearly came, but he just managed to pull himself back from the edge. A small string of cum did escape, however, and splashed against her beautiful booty. She raised an eyebrow and looked down over her shoulder. Resting on the shelf of her expansive ass was a little pool of viscous goo, and the guy responsible was down below her, smiling sheepishly.

"Spike, you naughty thing. You almost finished without me."

She wiped off the goop with her fingers and fed it to Twilight, who hungrily licked it off her fingers.

"I'd better cast an anti-impregnation spell, there's no telling what would happen if I didn't."

A faint yellow glow shone across her belly and then faded.

"Now, let's get to it."

She squatted over the immense pole and guided it into her sopping cunt with both hands. With a little push she swallowed the entire length inside herself and came down onto Spike's hips. Celestia was on cloud nine; she had managed to fit the whole length inside herself but it was a very snug fit. The feeling of that hard, thick meat pushing against the walls of her pussy and filling her so completely was heaven.

"Ready, dear?"

Spike nodded, sweat beading on his brow. He rested his hands on Celestia's huge, soft hips.

"Here we go."

She slowly raised herself up, the when she was three quarters of the way up his length, she slammed herself down again. Spike groaned noisily and his head raised from the pillow subconsciously. She paused and squirmed on his cock, revelling in the feeling of being so very full.

Spike was nearly passing out. Not only was the entirety of his immense cock stuffed snugly into the royal Celestial pussy, his balls were firmly sandwiched between his own thighs and a big, fat ass.

She carried on, raising up, then slamming back down. She quickened the pace, causing her massive breasts to jostle and jiggle. Beside them, sitting in a chair, Twilight was furiously getting herself off. The fingers on her right hand were a blur, slipping in and out of her nethers, slick with juices. Her left hand was twiddling her bulbous clit.

By now, both Celestia and Spike were dripping with sweat as they fucked with abandon, Spike squeezed into a tight passage and Celestia stuffed like a turkey. A messy climax was fast approaching. Spike cried out.

"Ohh fuck, I'm gonna cum so fucking hard!"

Hearing this, Celestia redoubled her efforts, leaning forward and letting her gargantuan melons flatten against Spike's ripped chest. Putting her hands on his shoulders, he began thrusting upwards and penetrating deep into her. Twilight could take no more and her insides turned to jelly as she climaxed, spraying femcum all over the floor beneath her.

Spike thrusted faster and faster, his meat rapidly sliding in and out of Celestia's puffy labia, a mixture of both of their juices coating his dick.

"Fuuuck!"

They virtually came in unison, Celestia a few seconds before. As she climaxed her pussy convulsed and clamped down on Spike's cock which instantly pushed him straight over the edge. A thick, steamy jet of cum rocketed up his length and blew out her stomach a few centimetres. Spike was cumming in one long stream, the duct inside his cock trying desperately to keep up with the endless supply of cum being blasted out of his balls. They moaned and groaned as their orgasms went on and on, Celestia whimpering and holding tightly onto Spike as he kept his dick wedged in her, filling her with his potent seed.

After half a minute of nonstop cumming, Spike was done. He brought his hips back down and Celestia laid on top of him, his deflating meat disappearing between her thighs.

Outside, in a nearby tree, a figure with binoculars was watching through the bedroom window.

"Yes... Enjoy yourself, my dear Celestia. Soon you'll be so engrossed in your sexual endeavours, you'll have neither the desire nor the ability to stop me. Chaos will reign once more!"