I was sitting across from my girlfriend at breakfast when her tits started to grow. It was very slow at first – I almost didn’t realise it was happening, but she was wearing a particularly tight t-shirt, and she normally had no breasts to speak of.

But now, as she drank her glass of milk, two tiny mounds were starting to develop on her chest, slowly pushing forwards into her shirt, gradually getting bigger and bigger.

My eyes widened. “Gemma?” I spluttered.

She smiled and took another large drink of her milk. She had a little white moustache above her top lip, and her teeth were large and white beneath.

“Yes George?” She started tucking back into her hash browns, as her breasts slowly – agonisingly slowly – inflated, pumping up and pushing out, slowly edging closer to the plate in front of her. They were approaching the size of softballs.

“Are you ok? My parents are gonna be down soon.” It wasn’t often Gemma was allowed to stay over, and I really didn’t want her to make a bad impression. I felt like slowly growing tits might fall into that category. I’d be leaving home for good soon, but I wanted this last summer with my folks to be a good one.

Her breasts enlarged further, starting to pull at the fabric of the shirt, stretching it around her swelling bust, pulling the seams tight as her boobs bulged bigger. It was at this point I noticed Gemma wasn’t wearing a bra. She always wore a bra. Something (apart from the obvious) was up.

“Gem, you know you’re-“

“Shhhhh.” Gemma put a finger to her large, pink lips and smiled, taking another big slug of milk, as her breasts bulged outwards. I noticed her white top riding up to reveal her gorgeous, flat stomach and I suddenly thought about what she’d look like with humongous tits. I’d never told Gemma, but I loved girls with huge boobs. Really huge.

Gemma was pretty short, around 5’3 and very petite. That was how I liked ‘em, apart from the in the breast department. Gemma had never really had any tits to speak of; I kept hoping for a late growth spurt, but we were both 18, and I’d started to think she’d missed the boat. Apparently not.

Gemma’s shirt started to lift up further as her breasts expanded outwards, and her nipples were growing incredibly hard – poking out of her shirt like tic tacs. I was getting really horny.

Gemma noticed me squirming in my seat, and swallowed the rest of her milk, wiping her mouth with the back of her arm and smacking her lips. As if in response, her breasts surged outwards, swelling forth almost a whole inch. They were getting so big now, and on Gemma’s short frame they were soon going to look ridiculous. I found myself hoping they’d keep going.

I heard some distant noises upstairs.

“Shit, my parents are up. Um…Gemma. What’s, like…what’s with your…”

“My big, fat tits?”

I went pale. Gemma never usually spoke like that.

“…yeah?”

“I’m on an experimental hormone, George. It’s to do with lactation and breast milk production. There was supposed to be mild growth, but when I drink milk, everything gets confused and I…fill up.”

My jaw dropped. “So the more you drink, the bigger you get?”

Gemma nodded, hefting her roughly E-cup tits in either hand. They were already so large on her tiny frame, bulging out about 5 inches.

“You want them bigger don’t you? I can see it in your eyes.”

I must have been giving everything away. To be fair, my cock was taking over all rational thought.

I nodded, dumbly.

“Good. Me too.” Gemma stood up, her luscious round tits curving out of her shirt. I loved seeing her in profile – her tits were too big for her shirt, and stretched it gorgeously, pulling at every seam. I wanted to see her burst out of it and keep growing. This desire both surprised and excited me.

Gemma walked to the fridge, her large breasts gently bouncing, and produced a massive carton of milk. Before I could say anything, she ripped off the lid, and threw the carton to her mouth, gulping down the thick liquid as quickly as she possibly could.

“Gem, are you sure-“

She raised her free hand with one finger up. I got the message.

I watched with fascination as she ferociously glugged the milk, massive bursts at a time. I could almost see it hitting her stomach and filling it up, bigger and bigger.

But the real growth was situated in her breasts, which were starting to swell again. As she glugged more and more milk, her tits started to fill up with milk of their own, becoming bigger and more full with every gulp of the thick white liquid.

After another few seconds of frenzied drinking, Gemma lowered the jug and breathed deep, gasping for air. She looked down at her tits, where the growth had already started to take place.

They were already two large round orbs on her chest, but they were now slowly getting even bigger and more firm. Gemma arched her back, as the two balloons on her front filled up and up, pushing out with each passing second. Inch by inch, they swelled bigger and bigger, pulling further at the stitching of her t-shirt, bulging out wider and wider, until they were wider than she was.

I loved watching this growth, and marvelled at how hard and huge Gemma’s nipples were. They looked like two bullets, sticking out from her shirt, threatening to rip it open, as the balloons they were attached to filled up bigger and bigger.

Gemma’s tits looked about an H-cup now and were ridiculous on her small frame. They were blowing up bigger with each passing second, and as she moved, I could have sworn I could hear the milk sloshing around them. This was impossible, but they moved with such a heavy, liquidy bounce that it was like there was two massive fleshy sacks of milk attached to my slim girlfriend.

Right now, they were the size of two ripe melons, and protruded about seven to eight inches from her chest. And they were still growing.

“Oh George, I’m so full.” Gemma moaned, cupping one of her massive boobs, and caressing her huge nipple. “I want you to milk me.”

“I’m sorry what?” I replied.

Gemma was upon me, shoving her new massive tits into my chest. I could see them bulging up in her shirt as she pressed them against me, and felt my erection grow and squeeze into her stomach.

“I’m so wet and full, George. Milk my big swollen jugs.”

Right at that point, I heard more thumping upstairs, and my blood ran cold. My parents were coming down.

“Get upstairs!” I hissed to Gemma. “If my folks see you they’ll lose their shit!”

Gemma laughed, and jumped up and down, sending her preposterous tits bouncing madly. I wanted to fuck her there are then.

“Stop doing that, it’s sending me crazy!”

Gemma giggled. “Sorry. I’ll sneak up the back stairs.”

“Quick, go!” I practically pushed her out the side door, just as the thumps on the stairs turned into the click of the kitchen door opening.

“Morning George.” Dad walked sleepily through the door, still in his dressing gown. “Everything alright?”

“Yup. All good. Everything is a-ok.”

Dad looked at me, with a raised eyebrow. After a second, he waved his hand.

“Too early.” He wandered to the fridge.

“Where’s Gemma?” He asked, opening the door.

“I don’t know.” I replied, truthfully.

Dad fumbled around in the fridge for a while, rattling and grumbling.

I moved towards the door, eager to get upstairs.

“George” came the voice from Dad.

“Yup.” I replied, feigning casualness.

“We’re out of milk.”

**

I shut the bedroom door, my heart pounding. Without turning around: “Did you make it?”

I heard gulping, I heard sloshing, and I heard a massive belch.

I span around to see what used to be my girlfriend standing by my bed, an empty milk carton by her side. Slowly, it dropped to the floor.

Gemma was standing there, with a massive, dirty grin on her face. Her stomach was poking out from her struggling t-shirt, and was distended with so many litres of milk stuffed into it.

My eyes slowly lifted up, delaying the pleasure as long as I could. I saw the enormous base first, then the massive curve, then two preposterously erect nipples, then the sheer scale of my girlfriend’s tits started to become apparent.

They were like enormous water balloons, stuffed to their absolute limit with milk. They swung out from her tiny form like two massive watermelons, stretching her shirt to its limit. They must have stuck out around ten inches from her body, and they were slowly, agonisingly starting to grow again.

“I drank it all.” Said Gemma simply, milk all around her mouth. “I want to be so big, George. So big. I’m so full.”

She stepped towards me, and her tits sloshed and wobbled in their skin tight cotton prison. Her t-shirt was so tight now it looked like it would burst open at any moment. I pulled Gemma close and kissed her, feeling her enormous fleshy mounds press into me like the massive bags of milk they were.

I could feel her starting to grow again, and loved the sensation of her getting bigger, her massive hard nipples pressing into me. We started to kiss hard, then Gemma pulled away.

“I’m too full, George. You need to empty me.”

I thought for a moment. Just a moment.

“Take off your pants. Keep that shirt on.”

I locked the door, removed all my clothes in a stumbling rush back to the bed, and span Gemma round, bending her over the bed. Her enormous, still-growing jugs flopped forwards, bulging into her incredibly tight shirt, threatening to tear it open. I wanted to be there when she busted out of it.

Slipping my ferociously hard cock into her wet, waiting cunt, I slowly began to fuck Gemma, pumping back and forth. She was holding herself up on the bed with shaking hands, the sheer weight of her big, fat, still-growing tits caused her arms to start shaking.

I thrusted away, fucking Gemma increasingly hard, causing us both to moan with delight. I reached around to one of Gemma’s impossibly swollen tits, and eventually managed to reach the large nipple, perched at the end of one of her huge mounds. The sheer size of her chest caused my dick to harden even further.

I grabbed one of Gemma’s enormous tits, and found I couldn’t get my hand fully around it. It was way beyond that. And still growing. I could hear ripping as Gemma’s shirt finally began to give way. It was never made for a chest of these proportions.

As Gemma bulged bigger and bigger, I grabbed a nipple, and began to tweak it. Instantly, Gemma began to moan. “Yes! Yes! More!” I “shhhed” her, knowing my folks were nearby, but I loved how turned on grabbing her nipples made her.

As my cock throbbed and grew harder and Gemma’s tits grew bigger, I started to feel a throbbing sensation around her nipples, and I knew that they were getting ready to lactate. Gemma was so incredibly full of milk, that she was going to burst if there wasn’t release – and so was I.

I moved my fumbling, desperately aroused hands over her right nipple, shocked at how large it was. As I pumped away, my cock growing nearer and nearer to blowing its load like never before, I began to tweak and rub Gemma’s nipple. It was getting harder and harder to reach as her breasts continued to fill and swell with milk. They engorged and hardened, growing larger and larger with each passing second. Soon, my hands wouldn’t be able to reach her nipples. She was so huge.

But while I could still reach, I tweaked and squeezed Gemma’s nipples, sending her into ecstasy. Using all my upper-body strength, I took my left hand and slipped it into Gemma’s tight wet cunt, rubbing her clit while my cock took care of the g-spot.

All this sent us both into a frenzy, as Gemma grew bigger and bigger, and her tits got harder and harder, full to their absolute limit with milk.

The tears in her shirt got larger and larger and her breasts bulged forwards to impossible proportions. They were starting to resemble medicine balls now, and were full to the brim, impossibly swollen full of milk. And still growing. She’d drunk too much.

As they bulged out of her clothes, a greater tear moving down the middle of her t-shirt, I moved my hand inside, and grabbed onto real nipple, not through the clothes. Instantly, my hand became as wet as the one inside Gemma’s cunt, as milk began to drip out of the massive nozzle on her huge melons, ready to spurt milk in all directions. She was so full.

Our tremendous fucking was reaching climax – neither of us could hold off much longer. I felt my cock harden one last time, and knew it was a matter of seconds. At the time, Gemma’s nipples grew even harder…and massive bursts of milk started to fire from the one I was rubbing. I could barely hold on, as Gemma’s tits were still swelling further away from me, but the sheer act of such eruptions couldn’t help but turn me on beyond belief, and I began to come.

Gemma felt my cock begin to spray inside her tight cunt, and this threw her into orgasm, her gorgeous cunt throbbing and contracting around my ejaculating member. This in turn sent more gorgeous milk flying from her impossible breasts, shooting over the bed, and send us both into screaming ecstasy. It was incredibly.

But, eventually, it was over.

Gemma lay on her back over the end of the bed, leaning slightly to the side, allowing her breasts, which were now around twice the size of her head, to rest. They were remarkably perky for their ridiculous scale.

Little trails of white liquid dribbled out of her still-engorged nipples, sliding down the enormous curve of her colossal bust.

We both sat there, breathing deep, unable to process what had just happened.

I lay against her, completely drained, feverishly imagining what the future held for us.

Neither of us said anything for a while. Then:

“Got milk?”

We both knew it was coming, but neither could help but laugh.

—

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