Conservation Of Mass

In this story, Lynn tries a strange device her boyfriend Issac 'borrowed' from his roommate, if it works as intended it'll grow her breasts, but maybe Issac should have asked about it beforehand...

Be sure to check the Tags and I hope you enjoy the story!

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"Are you sure this is a good idea?" Lynn asked as she held the strange device in her hand, it looked like a DIY dog shock collar.

"Of course, I told you, my roommate is basically a genius and he told me how he already got it working!" Issac explained as he sat down beside the taller Lynn. They both came to enjoy their unique height dynamic, although most people were shorter than Lynn, Issac being almost a full foot shorter than her at barely 5' 5" left him shorter than most other guys to boot.

Lynn looked back down at the device, it seemed harmless enough, a small box with a dial, a button and two rounded prongs on the inside, at either side connected a stretchy rubber collar meant to hold it steady around a person's neck. "And you're

sure

he said it'll grow my breasts?" Lynn asked once again, her doubts still holding strong.

Issac grinned, "Of course! He even said it works best for taller people and that it's completely reversible!" he touted. Lynn swallowed nervously, at 6' 4" she was quite tall but hadn't been blessed with the kind of big curves that most guys looked for and the curves she did have were made even less noticeable thanks to her height. She kept her brown hair long, down to the middle of her back, just so people were less likely to mistake her for a guy.

"Fine, I'll try it." Lynn sighed as she relented. With a bit of help from Issac she stretched out the rubber collar and slipped it over her head. Pulling her hair out from under it she twisted it around until the small box was on the back of her neck, she could feel the little prongs pushing into her neck slightly.

The collar was pretty tight but Lynn was able to take a deep breath easily enough so it shouldn't cause any issues she figured. "So what did your roommate say to do next?" Lynn asked Issac as she faced him.

"Er...well...I guess we just pick the setting and hit the button..." Issac paused frequently during his 'explanation', Lynn's eyes narrowed. "Your roommate didn't actually

lend

this thing to you did he?" Lynn sternly questioned her boyfriend.

"Well no, but I know he's got classes all day today so it's not like he's going to even notice, and it's only got the dial and a button, not exactly rocket science okay?" Issac defended himself but Lynn felt her doubts growing again as Issac made further excuses.

"Alright, fine!" She cut him off, "if he didn't say what to do you'll just have to figure it out,

and take responsibility.

she sternly added, Issac only smiled of course. He motioned to have her turn her head away from him so he could look at the box as it sat at the base of her neck. "Huh..." he mumbled as he pushed her hair out of the way and looked at the device.

"What do you mean 'huh', what do you see?" Lynn groaned. Issac coughed, "Uh well, the button doesn't say anything but the dial goes from two up to seven." he explained.

"...huh..." Lynn mumbled this time, she was expecting it to be done via cup sizes or something, even a one-to-ten scale would have made some sense, but two-to-seven was just weird.

"Well just set it to three, let's not get crazy here, I'd still like to fit into my clothes." Lynn directed Issac and she heard the soft

click

of the dial as Issac changed it.

"Speaking of clothes, you should probably take off your shirt and bra...uh...just in case?" Issac hesitantly pointed out, Lynn knew he was just interested in the eye candy of watching her chest grow but to be honest she was kinda interested in directly seeing what would happen herself.Surely a bit of caution was warranted..."Alright, go lock the door, my roommate should be gone for a few more hours but just in case." Lynn told Issac as she carefully pulled her shirt up and started unlatching her bra.

"Right!" Issac exclaimed as he very un-subtly jumped up and practically ran for the door to latch the deadbolt. As he returned he sat on the couch and looked up to Lynn as she stood, chest exposed. She did blush a little bit as the open air brushed against her nipples.

"So now I uh...just push the button right?" Lynn asked as she reached towards the small box strapped to the back of her neck. "Yeah that must be it." Issac responded, clearly a bit distracted. Lynn sighed as she found the button by touch and pushed it, she was rewarded with a loud and sharp

Click

.

Lynn immediately tensed up, not sure what to expect but nothing seemed to happen for several seconds. She nearly jumped out of her skin as Issac spoke up, "Do you feel anything?" He asked excitedly.

Lynn took a deep breath to calm her nerves, "No, I'm not feeling anything, your friend must have lied to..." Lynn paused in chastising Issac as suddenly as she heard a soft hum coming from the device, it was slowly growing louder. "Do you hear a hum?" she asked Issac, he paused for a moment, focusing for a bit before he heard it, "Oh yeah, seems pretty faint to me?" Issac murmured, still listening to the hum. Right when Issac said he faintly heard it the hum stopped getting louder, it seemed not that faint to Lynn but it wasn't painfully loud or anything.

"Yeah it seems to have stopped getting lou...guhwah!" Lynn flubbed as the box sent some kind of shock or tingle directly into her spine, it wasn't

painful

but it didn't feel natural by any means. She took an uneasy half step as Issac got up to his feet, "Are you okay?!?" He barked, clearly concerned.

Lynn gritted her teeth as she held a hand up, "I'm fine...it just...caught me off guard..." she wheezed out as she worked to keep herself steady. It didn't feel like an electrical shock or anything but she still

felt

it in a way she couldn't quite describe. But as it spread through her body there was one thing she knew for sure it was doing,

it was turning her on!

"Mmmm...fuck..." Lynn mumbled as the tingle spread through her entire body, her pussy was getting wet, her nipples were rock hard and her breathing was getting increasingly ragged as the device got her worked up like nothing she'd ever experienced before.

Lynn and Issac had been intimate enough that he quickly realised what was happening, "Are you feeling...okay? Should I take it off you?" He questioned her nervously.

"No...leave it...this feels...

Amazing!

" Lynn gasps, she doesn't feel like she's gonna fall over any more so other priorities come to light, she slides a hand down under her panties and starts to play with her clit while her other hand teases one of her nipples.

Lynn closes her eyes as her pleasure soars from her fingers working her sensitive spots, so she doesn't see Issac's eyes practically bulging out of his head as he watches her. Suddenly the hum from the device cranks up in volume again as the pleasure she's feeling gets even more intense as her whole body is enveloped by the tingling feeling from before.

"...oh god yes!" Lynn moaned, her whole body felt like an erogenous zone. She's so focused she doesn't even hear what Issac says to her as her hands start roaming her body, her hands effortlessly moving from her pussy, stomach and thighs. Lynn continues moaning as her hands roam, but suddenly she feels something shift as the tingling grows more intense in her chest.

Opening her eyes and looking down as she brought her hands up to her chest she starts to grope them, in addition to how good it felt for a change Lynn couldn't help but feel puzzled as something felt off, forcing herself to focus and push through the haze of pleasure and arousal she quickly realised that however impossible it

should

be, her breasts were growing.

And they were growing

fast

from flat to the point that they were already surging into B-cup territory and didn't show any sign of stopping either. As more and more flesh pushed out her chest her hands went to work, squishing and groping her breasts, sending spikes of pleasure right to her brain.

Lynn was so focused on her breasts as they ballooned into C-cups she didn't even register Issacs amazement that the device was

actually

working.

It wasn't long until she felt something pressing into her palms. Forcing herself to pull her hands away she watched as her D-cup tits dropped down and settled in the perfect shape, not saggy, but not the firm orbs that indicated silicone implants. She also noticed that it wasn't just her breasts...no...her

tits

that were growing, her nipples were blowing up too.

They were only about as large as the last part of her pinky finger, but that was already

twice

the size they had started out at, and as she brought her fingers back to her chest and lightly pinched at her new nipples she gasped in shock at how sensitive they were!

"Oh shit..." Lynn mumbled under her breath as her chest started to push out into DD-cups, hefting them in her hands she felt her pussy clench up as their weight registered in her mind. A small corner of her mind had to admit Issac's idea of taking off her top and bra had actually been a good idea, no way her little A-cup bra could have contained these knockers!

And yet as they continued to grow, so did Lynn's concern. She'd always wanted bigger breasts,

who wouldn't

when they were as flat as a board like she was, but her growth was going well beyond simply 'bigger'. They were overflowing her hands, even with her fingers spread out it felt like she could barely keep them lifted up, flesh spilling out around her hands and through her fingers.

Unbeknownst to Lynn, Issac had been trying to get her attention this entire time, but she had been in her own little world, just her and her growing tits. It wasn't until he reached out and grabbed her by the shoulders that she snapped out of it.

"

LYNN!

" He cried out as she looked up at him, since she'd last been aware of him he'd stood up from the couch, "Are you okay?" he pleaded with her for an answer.

"I feel amazing, but these tits are getting a bit out of hand..." Lynn worried slightly as they were growing into F-cup territory as they talked.

"Babe, you gotta look at yourself!" Issac urged her, though looking down at her chest again everything seemed fine as she watched the growth continue for a second before looking back up to him. "What's wrong, are they getting

too big

for you?" she asked, she knew he liked big boobs, stumbling into some open tabs on his browser had revealed that much to her at least.

"Ugh, not your tits, the

the rest of you!

Issac groaned, clearly frustrated by Lynn's unawareness. "What are you talking about..." Lyn started to comment as she twisted to look down past her huge tits, as she did so and focused on something else other than her chest she suddenly velvet a wave of vertigo slam into her. Fortunately Issac was still holding onto her shoulders so she didn't fall over at least as she nearly stumbled to the floor..

As her focus shifted and the vertigo passed, Lynn quickly realised that her perspective was

off

, she'd lived her live seeing the tops of almost everything in her day to day life, things like the tops of fridges, closets and more, but now, despite still being on her feet it felt like she was sitting down. She also couldn't help but notice that her pants and panties had dropped to the floor at some point, leaving her standing there completely naked. Looking back to Issac she finally realised that she was now looking

up at his face!

"Whu...what's going on?" Lynn stammered as her concern grew even faster than her chest, now past any reasonable cup sizes. She also realised her perspective was still shifting downwards.

"I don't know, the hum was happening, you looked like you were enjoying it and your chest started growing, but then you also started

getting shorter!

Isaac explained hurriedly as he watched Lynn's chest grow and steadily lose inches of height at the same time. Lynn could still hear the hum and feel the tingle but now that she was aware of her situation the concern and panic was overriding the pleasure, the fact her tits had gotten so big she had to basically cross both her arms under her tits to hold them up didn't help matters.

"Wait, how short am I now?" Lynn asked, Issac was still holding onto her shoulders and was a bit hunched over, he was clearly the taller of the two now though. Issac let go of Lynn and straightened out to his full height. "Uh...I'd say I maybe have ten or eleven inches on you now?" He offered and she couldn't disagree, the top of her head did seem to line up somewhere around his mouth or chin.

"I'm almost...

two feet

shorter now?" Lynn groaned as she tried to take it in stride, probably the only thing keeping her from totally freaking out was the pleasure emanating from her chest as they still kept growing outwards, which only reminded her that she was still shrinking. Could the growth and shrinking be linked?

"You said I started shrinking when my chest started growing?" Lynn questioned Issac as she tried to figure out exactly what was going on. "Uh yeah, they do seem linked don't they?" Issac wondered aloud but Lynn's mind was racing. Her thoughts turned to the two-to-seven scale on the dial, and how Issac said his roommate specifically commented on how it worked better on taller people...

Lynn's heart sank as she made the connection, "Uh Issac, I think I'm gonna shrink until I get to three feet tall, just like I had you set on the dial, the whole time my breasts are gonna keep getting bigger..." Lynn explained, afterwards she couldn't help but wonder if she'd even be able to walk by the time she was that short.

"Oh...uh...about that...." Issac stammered, like a kid caught in a lie, Lynn's eyes narrowed. "What did you do?" she demanded, turning towards him and doing her best to look angry in spite of her height and her chest.

"Well you said you wanted it set to 3, cause like, you didn't want that to get crazy with it?" He recounted. "Yeah...and?" Lynn forced him to finish explaining, Issac swallowing and taking a deep breath.

"Well my big breast fetish

might

have gotten the better of me and I actually set it to four instead..." He finished explaining, Lynn was fuming by the time he finished his explanation. "Dammit babe you can't do shit like that! That's a serious breach of trust!" she barked at Issac.

Issac held up his hands, "You're absolutely right! I am sorry about that...but..." He paused, "But

what?

" Lynn pressed, still angry with him.

"Well, by setting it to four instead we still got a win in a way, you're not going to shrink as much as you though, and I obviously your tits still got fucking huge, so it's win-win!" He happily explained. Lynn huffed and smacked him upside the head while she could still reach with one hand before returning it to support her chest, "That's just a coincidence! You can't take credit for that!" she retorted.

"You're right, you're right. But listen!" he stated, going silent afterwards. Lynn waited for a few seconds for Issac to continue but he remained silent, "What?" she prompted him to continue.

"No

listen

, the hum is gone!" Issac revealed and Lynn did stop to listen, it was gone and so was the tingling she realised. Looking back up at Issac's face she saw that her perspective wasn't slowly shifting anymore now that the shrinking, and her tits growing, had stopped! If she was four feet tall now, that meant that Issac had about sixteen inches on her, and she couldn't lie, with the shrinking issue no longer a priority, she got a bit of a thrill at Issac being taller for a change, her exposed pussy clenching at the thought.

Taking the time to look over herself Lynn noted a few things, first, her tits were huge, well beyond anything she'd ever imagined. They were easily bigger than her head and, from her new perspective at least, felt as big as watermelons.

Second, her nipples had continued growing, now long and thick enough that she could wrap her hands around them without fully covering them up. She was looking forward to having Issac handle those for sure.

Lastly, she looked curvier somehow. At first she thought the device might have been responsible but as she inspected herself more closely she came to a different conclusion, she wasn't any curvier than she was before, it was just easier to tell now that she wasn't so tall anymore, making her curves more prominent without making them any bigger.

Glancing over at Issac, he was clearly doing his best to wait patiently for Lynn's invitation to get 'involved', the tent he was pitching in his pants made that very apparent. As much as her growth had gotten her aroused she was still a little cross with Issac messing with the dial on the device, even though it had worked out well in the end.

Then she had an idea, if Issac's roommate was this much of a perv, it stood to reason the device might work a bit differently on guys...and even if it didn't, it'd give Issac a suitable punishment...

"Issac, you're sure this is reversible?" Lynn asked him, careful to not let him get suspicious of her motives quite yet. "Oh uh yeah, well, reversible might not be the best word for it..." Issac paused to think, probably recalling what his roommate had said when talking about it. "I guess the way he described it the effects would just slowly wear off over time instead, but I do remember him saying that you can also just change the setting and have it change you again." He explained as he recalled the information.

That was good, if nothing else Lynn could just always set it to six, it'd leave her a bit shorter but she could just wear some heels or something to make it less obvious if she had to go out before the effects wore off. With that it was time to put her plan into action.

"Well in that case, it sounds like it's your turn to wear it." Lynn explained as she dropped her breasts to free her hands to pull the device off and over her head.

"What? Why?" Issac leaned back, eyeing the device nervously.

"Well I am upset about you changing the setting on me, so I figure it's only fair you lose a bit of height too in return." Lynn explained, gently shaping her shoulders and letting her tits sway as a bit of a tease.

"But I'll just grow tits!" Issac argued, bringing his hands up to his chest and cupping a pair of imaginary breasts.

"Calm down, you said it yourself, it'll just wear off, and I was only planning to set it to five anyways, I doubt they'll even get up to B-cups with you only losing four inches of height." Lynn laid out as she prepared for the final blow, shifting her arms under her tits and hefting them up as well as she could, creating a monstrous line for cleave for him to gawk at. "Besides, sounds like a small price to pay for getting to play with these hmm?" Lynn teased, she forced herself to not laugh as she could practically see the gears grinding away in Issac's head as he considered her proposal.

To his credit it only took him a few seconds to respond, "Okay fine, that's only fair all things considered." He accepted as he held out his hand and Lynn handed him the device. "I'll leave it to you to set the dial, oh and don't forget to strip!" Lynn added playfully. Issac opened his mouth to object but at that moment his eyes crossed over to Lynn, already completely naked thanks to her shrinking and he smartly closed his mouth and started pulling off his clothes without further comment.

Lynn stood back and watched, enjoying the eye candy, licking her lips in anticipation as his stiff cock was finally released from its confines. The truth of the matter was that Lynn didn't think the device would cause Issac to grow tits, instead she assumed his roommate made it so that on women it'd grow their tits, but on

guys

their cocks would grow instead, all the better to titfuck the bountiful breasts it could also create.