They Just Grew

by Scott Curl

Rating: mature
Tags: Porn, Fetish, Bon-Bon, Sex, Anthro, Lyra, My Little Pony: Friendship is Magic, Alternate Universe
Length: 3598

I can't tell you how or why... But they just keep growing.

One day... It happened. I can't tell you why.

But they just grew. And now, they won't stop growing.

[Breast Expansion] [Hyper Breasts] [Absorption] [Endless Growth] [Loving Marriage]

(Cover art by kloudmutt.)

Published 2020-06-30 18:50:01 UTC
Last updated 2020-06-30 18:50:01 UTC

Grow With Me

I couldn't tell you why it happened. Or how it happened.

But one day... they just grew.

One moment, I'm standing in front of my bathroom mirror in the morning with my clothes off, my C-cup boobs staring back at me as I comb my hair. The next moment, I feel a pleasant tingle in my chest. I look down, and... they're growing. Swelling out. It was slow enough at first that I didn't notice. But after a few seconds, I gasped. I could tell, I was definitely getting bigger. I'd already swollen to a D-cup, and I was still growing.

I felt that little tingle again. I watched as I started growing even faster. I'd grown to a DD-cup, and I was still getting bigger. I just grabbed my tits, trying to make them stop, but I was suddenly hit with this wave of delight like I'd never felt before. It felt like pure euphoria. I didn't have anything to compare to how good it felt, and I lost myself for a second as I rubbed my growing breasts. But even as that wave hit me, I was getting bigger. Nearly at F-cups by now, I snapped back to my senses. Whatever was causing this, I had to find a way to control it. Without putting my shirt on, I ran out of the bathroom and into the bedroom.

Bon Bon was sitting on our bed when I burst into our room. She sat up straight when she saw me rush in, out of breath and blushing. I had to let go of my boobs, but they kept growing. Bonnie and I both watched as they swelled to G-cups, H-cups, and even bigger.

"Lyra!" said Bonnie. "What's happening to you?"

"I don't know!" I said as I watched my minty greenness swell. "They just grew!"

That tingling came back again. I had easily one of the biggest busts in all of Equestria, but I wasn't even close to done growing. After that lovely little tingle, my boobs grew a few cup sizes in just a few seconds. By this point, I didn't think there was a bra in Equestria that could fit me. Especially not when I was still getting bigger. I braced myself against the wall as they kept getting heavier, growing across my chest, getting closer and closer to the ground.

A few seconds more, and I was at... I'm not sure. ZZZ-cups? Is there such a thing? However big I was, my tits were touching the ground, each one nearly as big as me. The moment they did, I felt a rush of pleasure again. I gasped as the carpet on the floor was absorbed into my boobs, becoming a part of them. As fast as I was growing, that absorption made them start growing even faster. Bonnie gasped too, but out of shock, I think. That, and my breasts touched the bed, starting to consume it, too.

"Lyra! What in the name of Celestia is- AAH!" Bonnie was interrupted by my right breast touching her hoof, pulling her in along with the bedroom. She tried to kick, but it just got her other hoof stuck as well. I felt her sink into my breast like she was sinking into a huge beanbag chair. As she sunk, I felt that lovely tingle again, and I began to grow faster still. I tried using my magic to pull Bonnie free of me, but my boobs would simply not let her go.

"Unh! Lyra... L-Lyra, ooh Lyra..." As my boobs continued to expand, Bonnie's cries turned from panic to pleasured. I could hear her moaning, like I'd heard her moan when we'd made love. I was moaning too, even as my breasts were each bigger than me and gaining in size. My magic tugged on Bonnie, and each time I did, she just moaned all the louder. Could she actually be enjoying this, I thought? By this time, my tits had grown so huge, I couldn't see her anymore. But I could feel her sliding down into my tit, deeper and deeper, wriggling in delight the whole time. The pleasant tingles I'd felt in the last minute or so were nothing like how it felt to have my beautiful Bonnie sliding into me.

The last thing I heard before she went quiet was a muffled cry. But it didn't sound particularly scared. It sounded orgasmic. I felt her jerk her head back in a delighted whip as she completely sank into my right breast.

Even as my breasts kept filling my bedroom, I was stunned. Did my tits just... eat my wife?

"Bonnie? Unh, Bonnie?!" I said as my boobs rubbed against the ceiling, starting to absorb the entire room into their growing plumpness.

All of a sudden, I heard Bonnie's voice echo in my mind. "Lyra? Ooh Lyra, my love... Feels so good!"

"Where'd you go, Bonnie? I... ooh, sweet Celestia!" Absorbing the room apparently wasn't good enough for my massive tits. As they started to absorb the ceiling, floor and walls, I heard the wood around me begin to crack. My breasts were not satisfied with just one room. They wanted our entire house. I felt another tingle as my breasts expanded faster, plowing into walls and pulling them in. My tits had absorbed our entire bedroom, and were now taking in our living room. But even that wasn't going to hold them for long. Even with the absorption, my girls were shoving against the front walls, making them bend and buckle from their ever-increasing size and weight. It felt incredible.

"Grow, Lyra!" Bonnie's voice rang in my mind. "Please grow, sweetie! You need to keep growing! It feels so good, Lyra! Just keep getting bigger!"

I couldn't help but grin. I love my wife. And I always do what my lovely wife tells me. I felt another tingle, stronger than all the others so far. I could feel it coming. I bit my lip and moaned against the feeling. I wasn't fighting it anymore. No, I wanted to grow. I wanted to be bigger. I could already hear the wood of our walls cracking hard, moments away from shattering.

My breasts did what they do best.

They just grew.

As the tingle spiked, my tits exploded in size. The front wall of our house splintered into a million pieces, but all the debris that fell on my breasts was absorbed in an instant. I was growing more than twice as fast as before, and there was nothing left of our house to show for it. And it felt spectacular!

Even over the cracking and splintering of the house, I could hear ponies gasping as my boobs rolled into the town of Ponyville. I'd grown so massive, each of my nipples was bigger than the average pony by now. And my tits were expanding so fast, the next few houses down the street were food for them just seconds later, absorbing the entire structures whole. I couldn't see who they were absorbing, but I felt a few tingles like when I had absorbed Bonnie. I could feel the delight and bliss of the few ponies I was consuming with my boobs. And I'd only just gotten started.

I heard a few blissful moans echo in my head for a moment as the houses down the block were absorbed from the ponies that were inside them. They were not gone. Not even hurt. They were blessed by my breasts. Blessed to be one with them. But I didn't stop there. I couldn't stop there.

"Ooh, Lyra!" came Bonnie's voice. "That's it, my love! I can't tell you how good it feels inside your growing breasts... Everypony needs to know! Bring the whole town inside them!"

Like I said, I always do what Bonnie tells me. Using my horn's magic, I managed to shift myself upwards just enough to see over the horizon of my huge tits, letting me watch my girls work. The next few houses became part of my tits even faster than the first two, bringing the ponies inside of them within me. In just a few moments, the entire block was part of me. I could hear ponies moaning in heavenly, orgasmic bliss as my breasts consumed them, each for a moment before fading into the background.

And as far as bliss went, I was getting closer to it with every moment. My minty green mountains rolled over block after block of houses and shops, growing bigger and bigger all the while. More to absorb meant growing faster, and growing faster meant more to absorb. By now, each of my girls must have been over a mile in diameter. And since they were that big, it meant that those pleasant little tingles were turning into euphoric tremors. I could feel my folds getting wet as they kept growing. It never stopped, and it never slowed down. With Bonnie's voice in my ear, it was heavenly.

Other ponies tried zapping my tits with their magic, but all that did was just make them absorb the magic and grow that little bit bigger from it. Before too long, my boobs had absorbed City Hall, and they were headed for Princess Twilight's crystal castle. I felt my breasts grow and grow against the castle, waiting until they were big enough to swallow it whole before it was absorbed.

That also meant absorbing the princess. I knew the moment that Twilight entered my breasts, because I heard her moan in pure bliss as she became a part of them. But that meant my tits had an alicorn inside them... And with a tingle unlike anything I'd felt before now, my growth exploded. Suddenly, my tits were growing more than twice as fast!

Expanding ever further, my tits rolled over Ponyville like a minty green tidal wave, absorbing everyone and everything they touched. My boobs had grown so big and so heavy, I felt them start to dig into the ground, plowing through them as Ponyville became one with my powerful breasts.

"Unh! Bonnie!" I cried out as the last bit of Ponyville was being brought inside of my girls. "I'm growing so huge! And I can hear all of those lovely moans from everypony... I want to keep going. I want my tits to grow even bigger!" As my breasts grew into the Everfree Forest, the mighty trees that made up the landscape there felt smaller and smaller as I kept getting bigger and bigger. Several miles of my titflesh absorbed them in an instant, bringing in all the creatures that dwelt inside of the forest with them. The tingles that came from bringing them all into my titty bliss must have included Zecora, since I heard her distinctive moaning and grunting inside my head.

"Lyra, I don't just want you growing bigger..." As Bonnie spoke, I felt a soft warmth run down my back, like Bonnie's arms were holding me. "I want you growing forever."

"F-Forever?" Not an unlikely prospect right now. My boobs were expanding faster than ever, rolling over the entire forest, absorbing everything in their path as we headed for Canterlot. I was growing so big, so fast, and it felt divine.

"Oh yes, my love. Forever. It feels like heaven within your boobs! I don't want you to ever stop!" That ethereal hug made me inhale, my folds growing even more damp. The ground rumbled beneath my tits. They wanted it for themselves. My boobs wanted me to be bigger. Bonnie wanted me to be bigger. I wanted me to be bigger.

I let the words linger in my mind, grinning as I saw my breasts stretch over the horizon, moving ever closer to Canterlot. My girls had already grown bigger than the mountain, looming over the town with their lovely minty green softness. I couldn't help but giggle as they approached, wondering what the nobles and the princess might say when they saw my boobs. "We don't know where they came from, Your Majesty. They just grew."

My massive tits slid around the mountain, enveloping it and the city in my miles of cleavage. The mountain had no chance to get away from my hugeness, being absorbed into my ever-swelling bust. I felt hundreds of those delightful growing tingles as the citizens were pulled in, listening to them moaning for a few moments before they and their homes settled inside of me. I could tell when my girls reached the castle, feeling my enormous tits roll over the shining structure. I gasped in sharply, finally hitting an orgasm once I did. I couldn't help but kick my hooves against my growing pillows as I came, leaking my honey down my legs as the castle was absorbed.

But I wasn't hurting anyone. I wasn't destroying anything. I was making it all a part of me, containing everything I touched within my breasts. Then, I even heard the moans of Celestia and Luna within my tits. Another orgasm hit me like a truck, sending me down into my hugeness, muffling my orgasmic bliss against my pillow softness.

Even as I was cumming, I felt another massive growth spurt rumbling within me. These tremors of bliss were too strong to resist. With the power of three goddesses inside of me now, I knew Bonnie was right. My girls were never going to stop growing. I panted, grasping what I could of the heavenly mounds of boobs as they rolled over where the mountain used to be.

"Bonnie... Here it comes, Bonnie, here it comes! Grow for me, girls! Grow! Grow, grow, grow!"

They just grew.

My tits suddenly started growing explosively fast. I couldn't tell how fast they were growing, but they were more than twice as big almost instantly. The pleasure of all this growth hit me like a thunderbolt, sending me into another convulsion of lust. I could feel my tits absorb the likes of Cloudsdale up in the sky and Fillydelphia near the coast. My boobs had become so big that the skyscrapers of each city barely felt like bumps in the road. I was spreading further and further across the entire continent, my boobs growing bigger and bigger, faster and faster.

"My my, Lyra. At this rate, you're going to bring the entire planet into your tits, aren't you?" I could tell Bonnie had a smile on her face when she said that. Her warmth filled me as another orgasm started to hit me. My boobs were bigger than the entire continent, and they were still constantly getting bigger and heavier. It was only a matter of time before my girls outgrew the planet beneath us and absorbed it into me. They rolled over the little town of Appleloosa in the south, and the Crystal Empire in the north. And that, of course, meant that I now had all four alicorns contained within me, once I absorbed Princess Cadance and Prince Shining Armor.

"Yes, yes, yes... Wanna be big, wanna be the biggest, wanna just grow and grow and grooooow!" I could almost hear a faint collective moan from the world inside of my girls. All I could see in front of me was my girls, two massive mountains of minty green. My breasts knew I didn't want to resist them. I wanted them to grow. I wanted to be huge! I had so much power and warmth within, I just had to let it all out!

The rumbling of the next growth spurt finally hit me. I don't know how fast I was growing, but I could feel my tits rolling over the planet below me. I was lifted higher and higher into the air from the sheer size of my girls, rocketing through the atmosphere and up into the stars. As my tits expanded over the planet beneath them, I felt my cleavage start to slide around the sphere, tugging it in closer and closer like I had with Canterlot. And just like with that mountain, it was only when each of my tits had grown bigger than the planet itself that I began to absorb it.

Even as I kept expanding further and further into space, I could hear the collective moaning from the planet as I brought it inside of my breasts. The warmth of their lust contrasted with the coolness of the ice caps. I could feel the oceans splashing against my tits as I brought the planet inside of me. And soon, I felt it slip completely into my breasts, descending down into my warmth.

I'd done it. I'd absorbed the entire planet with my breasts.

"Oh, my sweet Lyra... You are truly incredible." I felt my face peppered with kisses from Bonnie, even a soft kiss to my lips. Even as I grew and grew into the vastness of space, those kisses were the most heavenly part of it all. I kissed back, opening my eyes to see a faint outline of Bonnie next to me, gently smiling.

"Bonnie..." I said, panting from pure euphoria as I looked into my wife's beautiful eyes. "I..."

She put a finger to my lips. "I know, my love. But we have important work to do. You've brought the planet into your tits. But don't we need the sun and the moon?" Bonnie smiled more.

I couldn't help but smile back. "Oh, Bonnie, you're right. I need to... no, we need to keep growing! We need everything inside these beautiful breasts!"

"Yes we do, Lyra! Do it for us! Bring everything inside of these tits! Never stop! Grow, grow, grow!"

They just grew.

I screamed in pure delight as the rumbles within me felt never-ending. I was constantly growing faster and faster, knowing that I was never going to stop. A soft push on my boobs told me that I'd absorbed the moon, and it was just seconds later that I'd absorbed the sun. And still, I grew faster.

The rest of the solar system wasn't far behind the other planets, becoming one with my girls as they grew outward. Every few seconds, they seemed to double in size, my growth rate constantly exploding upwards. Bonnie was beside me the whole time, holding me from behind and whispering sweet nothings in my ear. Hearing her voice made it even better as my girls expanded to absorb entire galaxies, entire systems, all brought inside of my tits with ease. I could hear the faint moaning of races I'd never even known about as I absorbed them, their planets and star systems insignificantly small compared to my mammoth boobs.

All Bonnie had to do was slide a hand down my leg, and I was cumming. I couldn't help it. Growing into this infinity felt so good! I kissed her back, muffling my grunts of orgasm in her soft lips. My girls were growing out further and further, with even supernovas and black holes unable to resist. My tits were, quite simply, the biggest thing in the universe, and the most powerful. Nothing could stop my tits. Nothing could even slightly resist them. Everything was being brought inside of me.

But as I was making out with Bonnie, I felt my girls begin to meet some kind of resistance. They weren't stopped, but something was trying to contain them. I could feel pressure building into the endless growth of my boobs. "W-What's happening, Bonnie?" I said. "Are we slowing down?"

She shook her head, giving my hip a gentle squeeze. And even that was enough to hit me with another euphoric wave. "The universe is trying to contain us, Lyra. It's trying to hold us in. It's trying to stop us from growing."

I panted, grasping one of Bonnie's hands in my own. "It won't stop us. Nothing can stop us... gonna grow, gonna grow forever...!"

Bonnie gently held me against her. She leaned in closer. I felt the pressure on my universal tits start to weaken. It was losing. It couldn't contain me. Couldn't contain us.

"I love you, Lyra."

"I love you, Bonnie."

We squeezed our hands together. We kissed.

My tits burst through the universe.

Instantly, my growth rate was beyond even my comprehension. My universal tits expanded into the multiverse, wanting only more and more. I felt a soft bump as my girls absorbed one universe. Then another. Then two more. Then hundreds more. The collective euphoria of the universes I brought into my girls washed over me every second. And I kept growing infinitely faster each time. I was growing not just into cosmic hugeness, but into infinity.

Because that's what they are. My tits are infinite. My girls will grow forever. With my lovely wife by my side, I will absorb everything inside of my tits. I'll grow into every universe, every possibility, every timeline. I'll bring it all into my boobs. I'll bring everyone to the euphoria that I feel every moment. I'll make everyone as happy as Bonnie makes me. And if I find another barrier, I'll break through that, too.

I don't know when, but I know that one day... Everything, absolutely everything, will be my boobs. I am a goddess of growth. My will be done.

And my one demand: Just grow.

Author's Note

I had this random urge to write a story like this. No real background, major plot details, not much explanation... Just the smut. A story that doesn't take long to give you what you came for.

Hope you enjoyed.