Dusk took a step back. Then another, and another. Twice his size was one thing, and maybe even however big he'd been when he first got stuck. More Bubble couldn't be too much of a bad thing, could it? But this - this?

This was simply too much Bubble Berry.

The now enlarged pink colt, with his shoulders sagging a little against the library ceiling, had to crane his neck down the tiniest bit. Noticing his friend's distress, Bubble tried to offer a cheerful smile. "You look a little nervous, Dusk - it's still me up here. Just...a bit more of me."

"A lot more of you!" Dusk exclaimed, "You're - you're..." Surveying the pony whose legs flanked him on both sides, he couldn't help but notice the balls and pink shaft that dangled enticingly near him. Letting out a nervous laugh, Dusk stumbled back even further. "Stay here!" he exclaimed, raising a hoof. "I know you might get the urge to explore Ponyville at this size, but now that you're this big..." He looked toward the ruins of his door. Using a bit of magic, he dragged a busted bookshelf in front of it. Bubble covered the windows all his own - any onlookers would be confused, able to see nothing more than a wall of bristling pink fuzz. "We have to keep you..." And the rest of Ponyville, he thought, "Safe."

"Of course!" Bubble exclaimed, head darting down a little. Dusk leapt back, now used to the telltale sign of Bubble going in for another smooch.

"Bubble!" Dusk scolded. The pony's head was now about the size of Dusk's entire body, and, now lower to the ground, he couldn't help but look into those vivid, blue eyes. He felt a little bad for shouting as Bubble's gaze turned, downcast.

"Sorry, Dusk, I guess this potion's got me all excited." His words washed over the purple colt, each warm breath distracting him from what he was saying.

"Well, it's just that we need to figure out what's making you -" With that, he noticed Bubble's head get the slightest bit closer, not because he moved, but because he shot up a few more inches. "Grow. Almost definitely the poison joke, judging by what I saw around your room, but I need to look up some of the more dangerous mixtures with the stuff, and see if there's anything I can make to counteract this whole thing."

Bubble smiled. "Well, thanks, Dusk!" A sudden, wet, slurping tongue washed over his face, the sudden force pulling his body up with it for a moment before he staggered back to the ground. "You're always looking out for me."

"You've been making this hard, Bubble!" Dusk reprimanded, wiping spittle off his face.

"That's not the only thing I seem to have made hard." Bubble's eyes narrowed a little, his smile a bit smugger than before.

Well, there was no denying that. Even so, Dusk was suddenly a deep red thanks to Bubble's forwardness. "Well, I..." He inched toward the stairway. "I'm going to go get washed up. Pony spit isn't really something you want in your hair when you're researching growth remedies. But you..." Bubble was still looking at him, bemused. It wasn't a look he usually saw on his friend, a slightly sultrier side.

It made him nervous, but a bit excited.

Nevertheless, Bubble's health came first. And this height couldn't possibly be healthy. "Just stay here, okay? Um," he caused a nearby book to levitate, opening it up and propping it on the enlarged pony's snout. "Do some reading!"

With that, Dusk bolted out the room and up the stairs, intent on cooling himself off with some alone time before getting started on his research, leaving Bubble alone with his growing self.

--
Had he been too forward?

Bubble wondered this when Dusk bolted out the room, beet red and obviously intent on dealing with the growing stiffness between his legs that had so obviously been caused by his actions. If he had been too forward, Dusk wouldn't have been so excited, right? At his normal size, Bubble never would've done something like that - not because he didn't want to, but because he wasn't sure if his friend would want to too, and if there was one thing he cared much more about than making sure he felt good, it was that others felt even better.

But now, with that subtle tingle shuddering across his body, he felt like he knew Dusk would like it. The kisses, the enormous lick, each tap of his big, round butt to get him in here. Each time, it'd been like a full-body massage for Bubble, and he started to realize, resting there in the too-small library, he was feeling good because Dusk was feeling good.

He licked his lips, trying to savor the subtle taste his friend left on them. That catalyst the books had talked about... Was it keeping him going like this? His eyes widened at the thought, squirming excitedly within his confines. He must have been growing since they first locked lips, whenever Dusk got excited, whenever he felt good thanks to Bubble...

That was helping him get bigger. Helping him make it even easier to make Dusk feel good, better than good, great! He scolded himself for not taking matters into his own hooves. Laying back, trying as best as an over-caffeinated pony hopped up on magic growth juice could to not knock anything over, he thought about how he could have blocked Dusk from leaving. How he could've looked down at his friend with that lusty look in his eyes, that look Dusk had so obviously recognized and adored - because it had sent a few more jolts up Bubble's body. Then he could have...could have...

Bubble squirmed in discomfort, trying to ignore the sudden stiffness between his legs. Nervous, he tried to ignore it. What if Dusk came down? It was one thing to be forward with the cute, purple pony, but to have him walk down to that? He grunted, shifting his weight a little.

There. He humphed, resisting the urge to touch the bobbing pink shaft - it was pleading with him with as much eagerness as Bubble often did his friends when he had a really, really fun idea. The only thing that stopped him was the thought that it'd be wasted without Dusk.

Sighing, Bubble sagged a little, trying to find a comfortable position in the library.

An hour passed. Then another. Bubble tried reading a few of the books, but the print was too small. He asked a few times for Dusk to come down and read something to him, if only for a little while, only to be met with a stammering reply that he was studying.

Two hours. Three hours. If Bubble wasn't blocking the window, he was sure he'd see that the sun had set, and night was coming close. This wasn't what he'd made the potion to do! Not be cooped up in some little library that he was too big for. He'd done it to make people happy! He'd done it to make Dusk happy! But, he supposed, breaking Dusk's house any more than he already had might do more harm than any joy he could bring.

Besides, Dusk was worried, and that worried him.

Maybe, he thought, eyes half-lidded as he reclined once more, letting out a little yawn - or, at least, little for him, if Dusk hadn't found anything by tomorrow, he'd let Bubble explore the town a bit. He smiled. That'd be nice.

Thinking of all he could do with his size, Bubble drifted off to sleep.

--

No. Not there. Maybe... No.

"Nothing, nothing, nothing," Dusk grumbled to himself, sending the last book in his pile to the floor with a thud. After getting past his more...pressing concerns, Dusk was able to bring himself back to the present, the present where his friend might be in very real trouble. So he started hitting the books. Books on alchemy, magic, poison joke, especially, was something he'd gone out of his way to learn a great deal about after his first brush with it.

But nothing seemed to come together! What made it worse, every time his mind started to wander, he couldn't help but think back to the rest of the day. Memories of grabbing mounds of Bubble's backside, trailing him and sneaking subtle glances on their way to his house, and Bubble's warm, overpowering breath washing over him, followed by an affectionate lick that pushed him over the edge.

"Ugh," Dusk sighed, turning from the pile of useless tomes. "Fine," he reasoned, "It's getting late, anyway. Bubble's asleep, you should get some rest, too."

Who knows? Maybe he could just curl up in bed, and by the time he woke up, all of this - whatever this was, would be out of Bubble's system. He could hope, at least - even if some little part of him seemed to think otherwise. "You need to get Bubble off the brain," Dusk muttered to himself. Not a particularly easy task, when the vague scent of the pony had seemed to tinge every part of his home. A subtle, strawberry scent. He liked it, maybe even- "Dusk, Dusk, Dusk," he muttered to himself, "There's plenty of time for thoughts like that later. Right now, you need to rest in your nice, comfortable..."

He let out a little groan as he rounded the corner into his bedroom. Of course the bed was busted. Of course! What else could go wrong? There it lay, having fallen victim to the subtle shifting of the house, thanks to a certain pink behemoth directly downstairs.

"Well, it won't be that difficult," he sighed, magic-ing the sheets and lowering them to the floor. Not the best of solutions, but it would have to do. "This'll work," Dusk mumbled sleepily, curling up on the makeshift layer of pillows and blankets, trying to drift off to sleep while the distracting scent of Bubble Berry crept up the stairs and invitingly into his nostrils.

-

"This isn't working!" Dusk grumbled to himself, trying for the umpteenth time to find the right way to keep comfortable. Dusk was a creature of comfort, particularly picky when it came to how he slept. He liked to be warm, he liked his bed to be soft, and he had neither of those things right now.

Then, a thought crept into his mind, begat by a faint, whinnying snore from down the stairs.

Bubble.

If there had ever been a bed bigger or warmer, Dusk would've wasted more bits than he had to enjoy its comfort. He smiled to himself - Bubble wouldn't mind. He probably wouldn't even wake up. Besides, he owed him this much, right? Being his bed for the night was a small price to pay compared to breaking his front door down.

So, slowly, carefully, he crept down the stairs. He didn't want to wake his friend, besides, if he had to ask to sleep on him, he might just die of embarrassment. This way, he could just go down, find a spot that was comfortable, and just curl up and go to sleep.

That was the plan, at least.

Dusk found Bubble lying on his back, unusually still, mainly because his long, long legs reached from one end of the room to the other, even curled. Somehow, he'd managed to fall asleep sitting up, reclined against a set of bookshelves serving as an extremely poor pair of armrests while his back propped up against the wall.

He bit his lower lip, looking the enlarged horse up and down. It wasn't this often he got to appreciate a colt, especially not one sleeping and on such proud display in his own library. Bubble's balls moved slowly, rhythmically, hypnotically with each inhalation and exhalation. The soft shaft lay just above, half-curled, putting his own to shame, coming in at a little over half Dusk's height. He tried to push the idea of it being his own size if Bubble were to get worked up far, far away.

But he wasn't here for that, he was here to get his well-deserved rest.

Gingerly approaching the giant colt, Dusk tested his side. His hoof sank into the soft stomach. Bubble wasn't fat by any means, but his belly did have a cute touch of pudge. Enough, at this size, to serve as the perfect bed and pillow set. Easing himself up, he looked to the sleeping titan, expecting at any moment for his eyes to pop open. Only now, in this compromising position, did Dusk realize how dangerous this might be. He tensed as Bubble seized a little, but relaxed as the pony started snoring normally.

Luckily, this wasn't someone rough-and tumble like Rainbow or Applejack. This was innocent, sometimes playful, Bubble Berry, a pony who'd sooner make a fly his best friend than squish it. Reassured by that thought, Dusk eased himself up the soft, sloping landscape of Bubble's belly. Wobbling across the uneven pudge, he found himself drawing near the middle, that sweet, strawberry scent absolutely everywhere. He steered clear of Bubble's crotch, too tempting, and his chest - less soft. Here, at the center of the belly, Dusk lowered himself down, and-

Oh sweet Celestia, Bubble was SOFT. He wasn't sure if some part of the enlargement process had done something to the colt's body, but easing himself down onto the soft belly was like getting his hooves on a heated water bed. A snug, pink, strawberry scented one, at that. He lay back and stared at the ceiling, sighing in contentment.

Already sinking into the soft, pink flesh, Dusk never wanted to move. With the rhythmic breathing of his friend and the subtle thrum of his heartbeat, he found himself intoxicated by the sensation. Rolling over, he tried to gently hug and squeeze the flesh he was lying on, not too hard to stir the pony, but enough to leave him satisfied. Part of him just wanted to pass out from exhaustion, but another part wanted to explore every inch of pink pasture he could get his hooves on, enjoying everything Bubble had to offer, until-

"Oh, hay," he grumbled. Lying on his stomach, Dusk realized he was hard again.

He'd already had a vigorous session in the private sanctity of his bathroom, but now, he couldn't help but feel his length slowly pulsing upward. He felt unbelievably guilty as it gently ran along the downy soft pink pudge. On his gut, really? The tongue had been one thing, and his butt an entirely different matter, but his belly? This soft, soft, stomach? This pudgy, perfect part of Bubble Berry?

Dusk groaned. He was working himself up. Already his shaft twitched along the surface, the friction between his own, sweating body and Bubble's plush form creating an incredible sensation. His heart pounding, Dusk glanced up at Bubble, relieved to see he was still asleep.

He could slide off right now, get down as quick as possible, before Bubble woke up and asked anything.

Or, the heady scent of Bubble's body seemed to suggest to him, he could just stay here and ignore it. He was Dusk Shine, after all. Surely he had the mental fortitude to withstand something like this.

Bubble unconsciously let out a sleepy sigh, causing a blast of warm breath to wash over Dusk. He shuddered, sinking further into the belly, holding onto his dignity and self-restraint by mere threads. Then, Bubble did something that pushed him over the edge. Something so simple, it cemented the sheer power his enormous friend now wielded:

He breathed in.

The simple feeling of the flesh beneath him pushing upward, into him, pressing into his crotch and smothering it, forced him to shake uncontrollably. Bubble's scent, the sensation of his svelte skin, it made him writhe for a moment. He was sweating all over. He could use his magic to...clean up when he was done? Yeah, he reasoned, gently gyrating his hips, allowing himself to enjoy the friction of his bulge riding up along his stomach and the pink landscape below. Bubble would never notice a thing.

Besides... His breathing grew heavier as new folds of flesh enveloped his shaft. It was the least Bubble could do for, for getting him worked up like this. He tried to keep his breathing muted while his heart beat quickened. Each time he felt a wave of Bubble's breath wash over him, he buckled, growing ever-closer to his embarrassing climax.

He couldn't help but squeeze a little tighter, burying his face in pink tum as he shuddered and shook. Close, so close, he sucked in Bubble's aroma, letting out slight, whimpering sighs as he tried to be completely enveloped in pink hair, pink scent, pink flesh. He was going to-

The cold air walloped Dusk as he found himself dangling above the belly he'd just been clinging to. His heart sank even as his cock twitched. Part of him wanted to reach down and finish it, but he couldn't, not beneath Bubble Berry's piercing gaze, two half-lidded orbs regarding him.

An amused, sleepy smile on his face.

"Dusky," he murmured, voice seeming to come from all sides. "You came back down."

"Bubble!" Dusk explained, still gasping. "Look, I'm sorry, I..." He paused. "Did you," he said, between gasps, "Get bigger?"

Bubble looked down, half-surprised himself. Where there had been the slightest amount of wiggle room in the library before, he now seemed to be scattering shelves aside with his immense frame, pushing them to the limit, cramping books along the walls, bits of his ponderous pink posterior pressing out the windows.

"Don't be sorry, Dusky," Bubble cooed, still holding him there. Instead of dangling him in front of his face, he now held him cupped in one hoof, eyes looking him over. Dusk was covering his throbbing erection with both hooves now, red not just from the exertion, but from the embarrassment of being looked down on by his friend like that - exactly how he looked down on so many of his own experiments. "You didn't have to sneak up on me like that." He giggled. "I'm your friend." His voice was hypnotic, hushed yet loud. "And I just loooove making my friends feel their best."

A second, enormous hoof closed in on him, forcing Dusk to part his own hooves. Soon, he found himself sandwiched between both pink pads, pinned. He wanted to grind against his pink prison, but Bubble had so much pressure on him, he could only lie there, feeling his package pulse beneath the soft hoof tip as it moved with agonizing slowness across his body.

Dusk groaned. "Bubble," he pleaded.

"Don't worry, Dusky," Bubble's smile deepened. "I know you liiiike it."

But Dusk didn't like it. He loved it. Being smothered completely and utterly, so entrapped by the whims of his friend. He shuddered and groaned, trying to thrash about.

"I know you've been staring," he said, slightly taunting. "When I was getting bigger, I saw you watching." He shifted a little, giggling. "Is it really that big?"

Dusk could barely process his friend's teasing, intent only on the unbearable pressure in his crotch. "But you've been watching much longer than that, haven't you?" He giggled. "Ever since you arrived in Ponyville, little Dusky." He grinded a little harder with his hoof, giving Dusk a few ecstatic moments of sensation. "I've always loved making ponies feel their best," he chuckled. "But you..." The words washed over Dusk. "I wanted you to feel extra special."

The hoof lifted, Dusk's own two shooting to his groin, intent on finishing the task. It was all too much. Bubble like this was...was...

"Oh..." Bubble groaned, shifting again. "You really liked that, didn't you?"

Dusk barely noticed that he seemed a little closer to the ceiling now, his own hooves jerking violently. "So...close..." he panted.

"Hold on, Dusky," Bubble's hoof pushed Dusk's aside effortlessly. He was now level with Bubble's face. It was definitely bigger than before, with a maw wide enough that he could crawl inside. If it meant release, he was certain he would without hesitation. Luckily, Bubble's thick, moist tongue slid out to meet him, instead.

Dusk lay back, enthralled as he was suddenly bathed in Bubble's breath. He whimpered as he let the tongue fall over him, the ropy muscle lacquering him with saliva. Dusk groaned, shaking a little as he let each affectionate lick lap over his crotch, his legs, his stomach, his face. He ran his hooves along the tongue, grinding against it as it explored him. Bubble's giggle was seductive yet clearly overjoyed at the same time.

He'd been waiting for this as long as Dusk had.

Dusk had little choice but to allow Bubble to wash over him like a relentless tide, each lap lashing him closer to release. Each strand of saliva set his nerves on fire, his body slicked with sweat and spit. Groaning, gasping, unable to process anything but Bubble's all-consuming tongue, he shuddered as his seed finally burst out in a furious, gushing flow.

"Mm-oh," Bubble said, or tried to, his tongue tied thanks to dealing with Dusk.

He barely had time to react as a violent groaning echoed from all sides. The sound of splintering and shuddering wood rang out all around him. A rush of movement later and he discovered he was being hugged to Bubble's chest as, from all sides, his friend expanded outward, and outward, and-

The cold breeze hit him like a mallet.

The two of them were lying there, in the wreckage of Dusk's home, he, overwhelmed by sensation, and Bubble ecstatic in his new, titanic state. Sitting up, his own shaft now at full attention, the titan colt looked down at the dazed, spit-slicked pony, now so small on the landscape of his stomach. Then, he looked around at the town full of curious onlookers who were eyeing him, the ruined library, and the mammoth erection that dwarfed most of their houses.

"Um, hello, everypony!" Bubble exclaimed.

It was going to be quite the night.