Big Tits Theory Pt. 02

With every stroke, my toes curled, and I could feel my pleasure building. As I came, Marty continued to fuck me, as if my spasms of pleasure were completely irrelevant. The thought that I was being used just served to turn me on even more, and my first orgasm had barely passed when I felt the building of another.

"I'm going to cum inside you," he muttered, and I smiled broadly in response. I could think of nothing better than to be a cock-slut for my big brother - after all, I was an E-cup. I was good for one thing, and one thing only: servicing men, getting them off, and it didn't matter to me who they were. If 92-year old Mr Richards across the street had even so much as hinted toward wanting me, I would have been on my knees so fast it would have made his head spin.

That would have been dirty, but it was nothing compared to this - this truly proved what a depraved little tramp I was. My own flesh and blood was inside me, fitting so snugly into my velvet pussy, one hand on my nipples, the other hand between our bodies, playing with my puckered asshole.

At the thought of Marty taking my ass, another wave of arousal crept across my body. I was sweating, now - we both were...and I loved it. I wanted him to spit in my mouth, I wanted every one of our fluids to intermingle. I wanted him to cum in my ass...for some reason, that held a greater taboo appeal than anything else.

I considered asking, begging him to, but I quickly realized that wasn't my place. I was an E-cup - I got told where to take the cum, I didn't get to decide. My genetics had conspired to make me nothing more than a little sex-slave, and I certainly wasn't going to try to fight it any more. Anything, anywhere, any time...

My second orgasm triggered Marty's, and I moaned with pure pleasure as I felt him filling me up with his warmth. I'm never going to shower again, I hazily thought, and even that was enough to turn me on a little more - the idea of spending the rest of my days covered in Marty's sweat, full of his come...

Fortunately, I quickly worked out that never showering again would severely cut down the number of men willing to fuck me, and Marty joined me in the shower. It was there that he took my ass for the first time, while holding the shower-head against my pussy and flattening me against the glass wall. A part of me wished I could see what we looked like at that moment, and it didn't take me long to work out that was the other part of my E-cups thinking for me, the part that wanted to be a porn star...

It was that thought that filled my head as I came: I imagined men all over the world were watching Marty fuck me, getting off while voyeuristically observing our incestuous pairing. God, I wanted to be a porn star almost as much as I wanted my brother to fuck me, and as he pounded my asshole, I climaxed again and again at the idea.

I wanted to be watched, I wanted to make men everywhere cum...after Marty had filled my ass and left me to clean up, I decided that I'd need to find a manager, someone to take care of the business side of things. God knew that I wouldn't be able to - I'd say yes to any offer that involved getting a cock inside me, and probably more so if they offered to film it.

I left for school in a daze, dressed in the clothes that Marty managed to find me - an outfit that one of his various bimbos had left at the house. It was important, he'd emphasized, that I didn't get expelled for turning up to school practically naked - the clothes were tight and slutty, but they'd probably pass dress-code...

...and if they didn't, I was sure that I'd be able to wrangle a meeting with the principal, and "persuade him" to let me off the hook, just this once.

Friday Afternoon:

Until recently, I'd always thought my big brother was a bit of a dweeb. Not irredeemably unattractive or anything like that, but certainly not the kind of guy who could bring a different girl home each and every night. And he continued to surprise me - I certainly didn't have him pegged as the kind of guy who got women, but as if the rough fuck he'd given me that morning wasn't enough to prove it to me, when I returned home that afternoon, I discovered that he'd bought a DSLR camera, just to take photos of me.

What a sweetie!

I immediately dropped to my knees to thank him, of course - he snapped off a few test shots of me sucking his cock, and that just made me blow him with more gusto.

It's probably, I thought, as my brother unloaded into my mouth and I swallowed it down gratefully, his knowledge of the Big Tits Theory that makes him so great with women. One look at her bra-size, and he knows exactly how to treat them...

Take me, for example. I'd woken up that morning an E-cup - the sluttiest of the sluts, the kind of girl who can't even say no to her own brother. Hell, as I'd proven, I was the kind of girl who would seduce her own brother...poor Marty hadn't stood a chance against what I was newly carrying around on the front of my chest.

After swallowing his seed, my brother presented me with a milkshake.

"We forgot, this morning..." he said, and I took it, immediately placing it on the bench beside me.

"Oh did we?" I asked, an innocent look upon my face. "Well, maybe we could...forget...again."

He resisted my attempts to lift his shirt up, and gestured to the milkshake once more.

"Please," he said, "sis..."

I pouted in protest, and it wasn't until he leaned in close and whispered "I came in it" that my face lit up. Next thing I knew, I was guzzling the milkshake down as fast as I could - I swallowed most of it, but a tiny bit spilled onto the copious amounts of cleavage that I had exposed.

"Whoops," I said, and he just smiled in response. If he was telling the truth, and he really had cum in the milkshake, that made 5...or perhaps 6...no, 5 loads that I'd swallowed that day. Not to mention the eight I'd taken in my cunt (including Marty, that morning) and the five that had cum in my ass (again, including Marty).

It had been a busy day.

After arriving at school, it hadn't taken Patrick long to find me. He'd given me an appreciative look, and that was all I needed - a few seconds later, I was following him to an empty classroom and letting him pound my cunt for the first time.

Once he'd cum inside me, I admitted to myself that I wasn't going to be spending much of the day learning, and set myself a few challenges. Less than half an hour later, I was fulfilling the first - I'd managed to convince two boys to accompany me to a disused janitorial closet, and after kneeling before them and sucking one cock and then the other, I engaged in my first ever double penetration.

I suppose in a sense I'm quite sexually inexperienced - I had only lost my virginity two days earlier, after all. But "inexperienced" though I am, I can tell you that the only thing that even compares to DP is having my brother's cock up my ass. They're both such taboo acts, and I feel so used...I don't remember the boy's names, but though they were reluctant to share me at first, as soon as I pulled my top off and had them sucking one glorious breast each that they agreed...at that moment, I think they would have agreed to anything.

I came and came and came. It was almost too much, to be honest, and I spent the rest of the day "taking it easy" by only having one guy at a time. Teachers, students, even that janitor who caught me in his closet...I made sure that each and every one of them walked away happy and satisfied, and when the final bell rang, I felt like I'd done a good day's work.

After my brother took some photos of me licking the last of the milk off my own teats (there's something you never hear about! Did you know that girls with massive tits can suck their own nipples? Honestly, I struggle to understand how any of us get anything else done...) Marty took me upstairs, and I had my first full photo-shoot.

E-cups want to know that they're pleasing men everywhere, all over the world...it's hard to explain to anyone who isn't so well-endowed, but it's a bit like having a great gift. Beethoven knew he had a gift, and wanted to share it with as much of the world as he could...girls like me, we're the same way. Our body is our gift, and we want to share it not only with people in our immediate vicinity, but everyone, everywhere...if you've got a cock, I want to know that I'm helping you get off, and if photos are the only way I can do it, then I'll take as many photos as I can.

I don't know where Marty got the money for it, but he'd gone out and bought dozens and dozens of costumes...cheerleader outfits, Sailor Moon costumes, a French maid apron and skirt...he'd even found a latex outfit that managed to be snug around both my waist and my tits - knowing my new dimension, that seemed like no easy feat.

The shoot felt like it lasted half an hour, but when I looked at the clock, I realized that it had taken us late into the night. By the time we were done, I was so wet you could have fit a whole battalion of men inside of me without effort. The last round of photographs (before the camera's battery ran out) were the ones that I was most excited to see...not because of the costume, which was a run-of-the-mill "sexy alien" outfit, but because I was so sure that you'd be able to look at the photos and hear me sloshing.

I begged Marty to fuck me, but my brother's surprises weren't over yet. He slapped my hands away from my pussy, and when I objected, threatened to tie me up.

The look on my face told Marty that it wasn't the threat he was hoping it would be.

Reaching into the bag he'd taken from the adult store, Marty pulled out another gift to me - a collar.

"An E-cup like you," he told me, "needs to belong to someone. And you, little sis, belong to me."

My heart melted, and I'm not going to lie - a single tear of joy trickled down my face as Marty put it on me. I belonged. What's more, I belonged to Marty, my older brother - the sexiest, loveliest, hottest man I'd ever known.

"You can't let anyone see it," he said, "especially not Mom...but when it's just you and me in the house, I don't ever want to see you without it."

I nodded solemnly - as well as the hottest thing I'd ever heard, I knew that what he'd just said was a sacred pact, and I was determined to uphold it.

"Good girl," he said, and then gestured to his lap. "Now come here..."

###

We didn't sleep much that night. Mom was out, for some reason, and so I stayed collared until we eventually got to sleep in the early hours of the morning. When he'd gestured to his lap, I'd assumed he wanted another blow-job, or perhaps even a fuck, but instead he laid me across his lap, and proceeded to spank my bare bottom.

I didn't understand at first, but as the pain slowly turned into pleasure, it dawned on me that this was just another case of my master knowing me better than I knew myself. He knew what an E-cup needed - I'd never before had any interest in spanking, but of course until my chest had grown, I'd never had any interest in becoming my brother's personal sex slave, or having naked photos of myself spread as far and wide as possible.

It wasn't about me, not any more. It was about my tits.

He spanked me until tears sprang from my eyes, until I begged him to stop, until my ass was raw and red...he only stopped, finally, when his spanking had made me cum. I tensed up, my hips thrusting uncontrollably forward, crying out in both pleasure and pain, but he didn't stop spanking me for the entire duration of my orgasm.

Finally, as I collapsed onto my master's lap, exhausted, he let up, and I looked up him with watery, exhausted eyes.

"Thank you," I said, and he smiled back at me, and pulled my cock out to suck.

We stayed in that position for a while, me suckling on his penis, totally drained. It wasn't the energetic blow-job that I'd normally give (and that my brother deserved) - it was more relaxing than that. It was almost like a form of meditation - as I sucked on him, like a baby animal at its mother's teat, I let my mind wander and drift, and thought about my new life.

I was a slut. I was my brother's slut...hell, more than that. I was my brother's property. Even as I lazily blew him, he began sorting through the pictures that we'd taken, deciding which ones to upload, which ones to sell and which ones to put online for free. A part of me wanted him to upload all of them for free, just so that as many men could jerk off while looking at me as possible, but even in my sex-crazed state, I was still capable of rational thought.

Marty deserved to make money from my body, if that was what he wanted. He could do whatever he wanted with me - if he wanted to film me being taken by a room full of men, I would have let him, just to make him happy. Not, of course, that I wouldn't have enjoyed it...

Finally, just as he was hitting "send" on the final picture, my energy perked up slightly, and I began giving him the full blow-job that he deserved. I knew I must look sex, in that moment - on my knees in front of my brother, my ass beginning to bruise from the spanking he'd just given me, wearing a sexy outfit and the collar that my brother had given me...

I thought that he was close to coming, but my brother...my master...had even greater self-control than I'd expected. Instead of blowing his load in my mouth, he grabbed my hair and roughly pulled me off his cock, practically throwing me across the room, and standing over me with a smug look on his face.

There was fear in my eyes as I looked up at him - he could do anything to me at that moment and I wouldn't complain. I wanted to be fucked...no, I needed to be fucked, but if he'd told me to lick his boots clean, I would have done it. He had complete control over me...and I loved it.

As my brother came toward me, I glanced down at his cock, entranced. It was so beautiful...I wanted it inside of me. I wanted it in my ass, in my cunt, in my mouth. I wanted it between my huge tits...but most of all, I wanted it to go wherever Marty wanted it to go.

He chose my ass, that first night. Fucking my ass when it was still sore from a spanking was a particular turn-on of his, and the soreness combined with the pleasure in such a glorious way, it soon became a favorite of mine as well.

While my brother came inside my ass that night, I glanced down at my huge, E-cup breasts. I had no idea why they'd grown so huge, so suddenly, but I'd never been so glad of anything in my life.

Saturday:

I couldn't believe it when I woke up.

I mean I literally couldn't believe it. I stood and stared at the mirror in absolute shock. My stunned brain didn't even notice the other changes - my hair was twice as long as it had been at the start of the week, my waist was somehow even thinner than it had been before, and in contrast, my hips had widened. My ass was plump and around, and my legs were toned, despite the fact that I wasn't really one for exercise.

No, all that I could see was my breasts...

They'd grown.

If I had to guess, I'd say I was an F-cup, but I was in completely unknown territory here. I could have been a G, H...do they even make "H" cup? I'd spent the first eighteen years of my life as an A, I'd never expected to have to know anything about the larger sizes.

What's more, they seemed to be completely defying gravity. A chest as large as mine, you'd expect a bit of sag...anything this large that stood up proudly would look fake, but somehow my breasts managed to be large, perky, and completely natural-looking.

I couldn't understand it at all.

My brother came looking for me when I didn't come downstairs. After filling my ass with his seed the previous night, he'd told me that he was going to cook me breakfast, and that I could wash it all down with another milkshake. He knocked on my door, and when I didn't answer, came in to find me standing naked in front of the mirror, staring in absolute shock.

"Wow," he said, reaching out to cop a feel of my new, huge chest. It felt incredible...each time his fingers brushed across my nipples was like a mini-orgasm, but even when my pussy started to drip, I still didn't move.

What now?

When Marty had first told me the Big Tits Theory, I'd understood it immediately. It made so much sense...but he'd only explained what happened up to an E-cup. E-cups were porn stars, freaks who fucked their brothers, who got off from sleeping with anyone and everything. For some reason, I hadn't even thought about tit-sizes larger than that...

...but now, I was an I-don't-even-know-what-cup. What did that make me?

Marty led me downstairs...he didn't even bother putting clothes on me. I guess that meant we were going to be fucking sooner rather than later, a thought which excited me without altering the blank look on my face.

What was I?

As I mindlessly ate the bacon and eggs that Marty served me, and sipped on the milkshake he put into my hands, he began to explain.

F-cups, G-cups, H-cups, and everything above...they were special. Precious, he said. C-cups were a dime a dozen, D-cups were everywhere you looked (which was why he'd managed to take a different one home each night last week), and anyone could open up a browser window and find dozens, hundreds, thousands of E-cups, fucking and being fucked online for everyone's amusements.

But F-cups? F-cups were incredible.

F-cups were property.

I sat there as his words washed over me. Everything he was saying made sense - he explained that F-cups had no free will, no mind of their own. F-cups exist to be fucked, to be owned; if you let an F-cup out on the streets by themselves, they'll just latch onto the first man who glances at them sideways, the first man who shows any kind of attraction.

F-cups exist to get men off...and literally nothing else.

And when you grew past an F-cup, that's when you were really something special.

Where E-cups would say yes to anything and F-cups needed an owner to tell them what to do, G and H-cups went even beyond that. They got off on the sickest, most perverted things they could think of. They'd sit in a room for hours, just to come up with dirty things that they could do...and their orgasms were stronger than every other cup-size put together.

When an G-cup gets aroused, Marty told me, she'll do things that ordinary people would never dream of...and get off on it. They're extraordinary, he assured me, and then sat back to let me process what he'd just said while I finished my milkshake.

I found his words extremely comforting. I'd panicked, more than a little, not knowing what I was going to do, but as I sat there and sucked up the last of Marty's latest delicious milkshake, I realized exactly what I was going to do.

I was going to embrace my life as an G-cup. H-cup? It didn't matter. Nothing mattered, just getting fucked, getting off...and being owned.

Marty jumped as I stood up suddenly, turning to him, grabbing him by the hands, and pulling his face toward mine.

"Come here," I said seductively, before making out with him, letting his hands roam all over my new, hot body. His every motion sent shivers down my spine, and I swear I had a small orgasm just from him grabbing my butt.

He followed me as I marched into the bedroom...he was curious, no doubt, as to exactly what I was going to do. I thought I sensed a hint of fear, as well, but you know what they most likely say: Nobody gets in the way of an G-cup and her perversion.

Throwing him down on the bed, I pulled his jeans off, and took his cock deep down my throat, choking slightly and slobbering all over it. His eyes opened wide in shock as I reached around behind him and put a finger up his ass, but he soon relaxed and even seemed to enjoy it.