Mary and Jeanette bounced down the forest trail, backpacks jumping behind them as they practically skipped through the dappled sunlight.

Both college graduates, they’d decided to take some time to reassess their relationship as they stepped into the terrifying real world, with all the mundanity and sitting and desks that entailed. Both had graduated law, but both were feeling unsure – but now wasn’t the time for worrying. Now was the time to explore.

Both were very tall, just under 6 ft, and both slim and toned, from lots of outdoor excursions. Mary was the older by two months, but Jeanette always assumed the dominant role, because that was how they both liked it. They’d both met studying, and fell in love (well, first it lust) as freshmen, and things had gone from there. Even after three years of being together, they still couldn’t keep their hands off each other.

Mary brushed her shoulder length hair out of her eyes, and readjusted her backpack. The straps were just either side of her tiny boobs, and occasionally rubbed against her nipples, which she found pretty uncomfortable. Both Mary and Jeanette had small breasts, though, from watching porn together both knew the other liked things to be on the busty side. They’d both fallen in love though, so things like that didn’t really matter. But bigger would, as the saying goes, be better.

“Hey, look!” Called Jeanette, grabbing Mary on the shoulders, and leaning past her cheek, which she gave a quick kiss. “Mushrooms”!

Jeanette was known to be considerably more experimental than Mary, and had been markedly the more wild of the two during their college days. It was one of the reasons Mary loved her so much. But Mary wasn’t sure about these mushrooms.

Jeanette had already jogged over and plucked a bunch from the ground, putting them in a little baggy she produced from her pocket. They were bright pink, almost glowing, it seemed to Mary, and looked, to her untrained eyes, ridiculously poisonous.

“Um…Jeanette, what are they?”

“I have my suspicions.” Jeanette smiled, biting the top off one.

“The fuck?!” Mary cried, grabbing the bag.

Jeanette grinned, chewing the contents down and swallowing. “Trust me, they’ll be fine.”

“Based on what?!”

“Do you trust me?”

“Well, yes-”

“Sweet. Want one?”

“Definitely not!”

“You will.” Jeanette’s smile was equal parts arousing and disconcerting. Mary had seen it before, and it usually meant trouble.

***

A few minutes later, they got to the campsite, where their tents were already set up, along with a pile of wood ready for a fire. Mary looked around, breathing in the evening air, watching the sun slowly sink over the horizon. It was a beautiful scene. She turned back, to see Jeanette with her back to her.

“Everything ok, babe?” Mary asked.

Jeanette didn’t move. She looked down, and then her head rose again.

“I’m tired. Let’s go to bed.” Was all she said.

“But it’s pretty early-”

“We should go to bed.”

Mary looked over with a pained expression. She hoped everything was ok.

“Sure, J.”

Mary left her backpack at the door of the tent, and sat inside, the dim light crawling over her, waiting for Jeanette. She heard the backpack drop down, and saw Jeanette’s back as she reversed into the tent. This was more elegant than it sounds.

Jeanette sat there, her back to Mary.

“…J?” Mary ventured, after an agonising pause.

Nothing.

Mary crawled closer, until she was at Jeanette’s neck. She kissed it lightly, stroking Jeanette’s short blonde hair. Settling back on her knees, Mary started as Jeanette grabbed her hands, and moved them over her shoulders, and down to her chest.

Mary’s heart pounded, as it always did when she and Jeanette got intimate, but there was a different reason this time. As her hands moved down, they met Jeanette’s chest much earlier than she expected. This couldn’t be. There were two baseball-sized lumps on her girlfriend’s chest, and with Jeanette’s heavy and rapid breathing, it seemed like they were getting bigger…but they couldn’t be, that was insane.

Jeanette parted Mary’s fingers, and splayed her hands to cover her small, but much bigger than usual, breasts. Mary rubbed her nipples, knowing that was what Jeanette loved more than anything else, and Jeanette moaned. Mary started to get wet, as she softly kneaded Jeanette’s breasts, feeling her nipples grow bigger and harder with every passing second, jutting out of her grey t-shirt and through her small purple bra, which seemed very tight. Tighter than usual.

Jeanette was moaning and writhing, clearly incredibly turned on.

“Mary…the mushrooms…”

“J, are you…bigger.”

Mary’s mouth was dry. She could hardly believe it. She knew Jeanette knew it, but her fantasy was always to have bigger breasts, and to be with someone with bigger breasts. And when she said bigger, she really meant bigger.

“Eat one. Please.” Jeanette was practically begging her. Mary didn’t know what to say.

“But J-”

“Do you trust me?”

Mary thought for a moment. “Always.”

Jeanette writhed further, and grabbed a large pink mushroom, placing it over her shoulder, to Mary’s lips. She opened her mouth, and took the mushroom whole, sucking on Jeanette’s fingers as she did so. She chewed the mushroom down in a few seconds, and swallowed everything. It tasted surprisingly sweet and sticky, and not unpleasant at all.

It was at that point that Mary realised that her hands were struggling to get around Jeanette’s breasts even more than they had before. While she’d been eating the mushroom, her girlfriend’s chest had been…growing. They mushroom hadn’t finished making Jeanette’s breasts bigger!

Mary loved the sensation more than she could describe, as her girlfriend’s already larger breasts grew bigger still, swelling up and up, like they were being filled with air, or milk. Jeanette’s grey t-shirt was becoming arousingly tight, as her breasts blew up larger and larger.

Looking over her girlfriend’s shoulder, Mary’s own tiny breasts pressed into Jeanette’s back, she could see two large, 5-inch protruding mounds bulging out from Jeanette’s chest. The sight made her heart pound, and sent a bolt of arousal shooting through her body. This was her deepest, darkest fantasy, and it was happening right in front of her eyes. Her hands still clutching her girlfriends swelling bust, Mary began to kiss Jeanette on the neck, drawing moans of pleasure forth from her girlfriend.

Mary heard a chewing noise, and knew Jeanette had eaten another mushroom. She wanted to be bigger. Mary wanted her bigger, and wanted to be huge herself. She couldn’t believe what was happening to her girlfriend. She wanted the same for her.

“Give me another one.” Mary urged.

She felt the smooth pink object lift over Jeanette’s shoulder, as her breasts bulged bigger and bigger, spreading between Mary’s fingers as they swelled ever larger. It slipped between Mary’s lips, just as her own chest began to grow.

Jeanette could feel Mary’s breasts begin to expand as the mushrooms started to do their work, as her two hard nipples pressed more and more into her back. Jeanette knew this was everything she wanted, and moved her hand down to her crotch, starting to rub against in, her arousal getting more and more pronounced with every passing second. As soon as she touched her crotch, she realised she was already incredibly wet. She knew she was only going to get wetter. And bigger.

Mary’s hands were having trouble containing Jeanette’s swelling bust now, as her large breasts bulged between Mary’s fingers, growing larger and larger with every passing second. Mary looked down to see a big line of cleavage at the top of the neck of Jeanette’s grey t-shirt, which was being pulled away from her neck by the growing bust contained beneath. The seams on her shirt were starting to give – it was never designed to house such bulk, and Jeanette’s breasts were only getting bigger and more heavy.

Jeanette felt a band around her thin waist, and realised it was her old bra, which had been pushed out of play a while ago by the growing curve of her twin peaks. Mary’s hands on her tits felt incredible; her nipples were growing more and more sensitive, the bigger she, and they, got, and she could feel she was going to come before too long.

For Mary’s part, she was having trouble keeping her hands around Jeanette’s swelling chest. For one, Jeanette’s tits were getting too huge to hold with her hands, and were only getting bigger and bigger. To add to this, Mary was starting to grow herself, which, despite being the most exciting thing that had ever happened to her, was pushing her further and further from her girlfriend, as her bust blew up bigger and bigger.

Mary was wearing a white vest top, which actually provided a bit of cleavage (had she had much to offer), which was filling up fast, as Mary’s breasts swelled bigger and bigger. Jeanette was moaning and squirming with delight as her tits ballooned to around nine inches straight out in front of her, tearing and ripping her increasingly tight shirt. Jeanette played with her cunt as her tits blew up larger and larger, slowly pushing her arms further and further apart, as they took up more and more room.

As Mary’s tits inched out larger and larger, she found she could no longer reach Jeanette’s – there was too much glorious breast in the way.

“Turn around.” She ordered, in a voice that came out unexpectedly husky.

Jeanette did so, and Mary could see how big her lover had become. Ten inches of huge bust swelled outwards between them, bumping into Mary’s five inches, which were swiftly bulging into six. Their huge tits pressed gently into each other, and their nipples rubbed together, only making them longer and harder.

Mary looked down at the generous cleavage she now possessed, and wondered how big it was going to get. Jeanette was an exciting sign of things to come, though Mary wanted to be bigger than that. There would be time, though, and they needed to be able to fit inside the tent. For now.

Her t-shirt groaning, Jeanette tried to pull off her shorts and underwear, though this was difficult, as she couldn’t see below her wobbling bust as it swelled larger and larger every second, as both girls grew more and more wet.

Mary helped her, pulling her shorts and underwear off, and kissing her on her wet cunt while she did it. Jeanette groaned with delight, and Mary went to lift her head to kiss her girlfriend, but bumped it on the eleven inches of overhang that loomed above her. Her girlfriend’s chest was now comfortably enormous. Jeanette slipped inside a sleeping bag, unzipping it all the way to accommodate her titanic bust, and patted the floor, beckoning Mary inside.

Mary tits swelled bigger as she looked at the love of her life, but at seven inches of protrusion, they just weren’t big enough. They were huge, but she wanted more. She grabbed one more little ‘shroom, ate it in one, and removed her own underwear, without too much trouble. Her tits really were becoming an obstruction though, and she liked it.

Feeling her growth redouble, Mary clambered into the sleeping back with her swollen girlfriend. Their warm, wet cunts pressed against each other, turning them both hugely, whilst their humungous busts couldn’t help but bulge up against each other as they kissed. Looking down, it was like two huge pillows lay between them, and the bigger their tits grew, the more turned on they both got.

Jeanette’s huge tits were around thirteen inches now, and her shirt was tearing in numerous points. Mary’s breasts were catching up, and were tearing her top to pieces at about ten inches. Both wanted to be bigger but both were two swollen and heavy and aroused to get up, so concentrated on kissing each other as their huge breasts grew into each other, their rock hard, enormous nipples rubbed against each other, sending their arousal into overdrive.

Both started to crane their necks forward, as they found themselves being pushed away from each other by their titanic, jiggling busts, as their big fat tits grew larger and larger, bulging into each other, their twin canyons of cleavage meeting in the middle to create a third between their huge tits, which were running out of room.

Kissing each other hard on the mouth, their hands instinctively ran down to each others’ cunts, which were both unprecedentedly wet, and went inside each other. They both realised, with tremendous arousal, that their huge breasts couldn’t grow out anymore, as they were so crammed in against each other, and were starting to bulge upwards, like boiling water.

As they kissed each other hard on the mouth, and explored each other cunts with their fingers, driving each other insane with pleasure, they tits slowly inches upwards and upwards, growing bigger and more swollen with every passing second.

Jeanette felt it slightly earlier as her tits were still a bit bigger than Mary’s, but her bust had touched her chin. The realisation of how huge she must be sent her into overdrive, and she increased the speed at which she rubbed on Mary’s clit. Mary’s huge bust caught up seconds later, and the arousal jolted through her too, taking everything up to the next level.

Both their tops were tattered remnants of their former glory, as both girls’ breasts expanded out of them, leaving bits of cloth everywhere as they bulged into each other. The final increase in size was too much, and feeling each other about to come, they gave up trying to hold it off, and both allowed a tremendous wave of orgasm wash over them, both crying out loud and shaking as their bodies were wracked with pleasure.

Then, it was over.

It was almost a relief to Mary, who had never felt so out of control in her entire life. She tried to kiss Jeanette, but their humongous breasts wouldn’t allow it, so she shifted back from her girlfriend, moved her enormous breasts down a little, and tried again.

“These are going to take some getting used to.” Said Jeanette, smiling with fatigue and post-coital glow.

“Unless we get bigger.” Suggested Mary, reaching over to grab the bag of mushrooms, feeling her huge udders sweep against the base of the tent as she did so.

Jeanette raised an eyebrow.

“Unless we get bigger.” She agreed, grinning.

—

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