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Big Tits Theory Pt. 02

Story Info
Marty enjoys his sister's new tits.
8.4k words
4.21
58.1k
41

Part 2 of the 2 part series

Updated 06/09/2023
Created 01/12/2020
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Pan2
Pan2
496 Followers

Thursday Afternoon:

It had been surprisingly easy to seduce Dr Lorne. He was a professional, through and through, and I suspect that most attempts to make him act so improperly would have failed...but there are few men in the world who can resist a horny topless 18-year old girl who's throwing herself at you, and Dr Lorne certainly wasn't one of them.

My mouth descended on his, and after a few seconds of struggle he allowed himself to melt into the kiss, wrapping his arms around me and running his hands up and down my back.

"Oh, Doctor..." I moaned, and he tried, briefly, to distance himself from me.

"We really shouldn't..." he said, but I took his hands, placed them onto my plump breasts, and writhed in pleasure as he allowed himself to enjoy the feeling of two huge, teenage tits in his hands.

A few seconds later, his pants were around his ankles, and my hand was on his cock.

His cock...despite my first ever sexual activity being less than twenty-four hours ago, it felt like it had been familiar since I'd had the familiar feeling of a nice juicy cock in my hands. I wanted to taste it, I wanted to play with it...but more than anything, I wanted it to fuck me. I wanted to be fucked by my doctor, for the first time...he was there when I was brought into the world, and somehow, in my head, that made it okay for him to be the man to take my virginity.

The idea was only in my head for a few seconds before I was frantically pulling my panties down, bending over the patient bed, and looking back at the doctor.

"Please," I said as sweetly as I could. "...don't be gentle."

Dr Lorne's eyes widened, and I reached behind myself to guide his cock into my entrance.

It was everything that I'd dreamed it would be. His firm cock slowly pushed against my lips, parting them, finding the wetness inside of me. He kept on pushing forward as fireworks exploded in my head - I felt so full, I felt so good...I felt so useful. I was a D-cup, and that meant that I couldn't say no...not, of course, that I wanted to.

Finally, his cock was inside me, all the way. He stayed still for a few seconds to let me adjust - I'd never felt anything like it. I squirmed at the sensations that his member caused in me, and sighed with pleasure as he started pulling out of me again.

"Oh, Doc..." I said, and looked behind me to see if he was enjoying himself. His eyes were closed, and if his hands hadn't reached around and started pulling and tugging on my tits, I would have worried that it was because he didn't find me attractive. But then he pushed forward again, and I stopped worrying...about anything.

It didn't take the good doctor long to cum. As a medical professional, I was slightly surprised that he wasn't more concerned about protection, but I suppose he wasn't the type to put a condom in a gift horse's mouth, or however that expression goes. I orgasmed just before he did - every time he thrust into me, I clenched, and my clit went wild with delight. I couldn't believe how good being fucked had made me feel, and I think that my clenching pussy and gasps of pleasure were what set Dr Lorne off as well.

After we were done, he pulled out, and started to stammer an apology. I wasn't really listening - I was sitting up on his bed, legs spread, looking at my pussy. If I squeezed in a certain way, cum dripped out, and it was one of the most beautiful things that I'd ever seen.

"Are...are you on the pill?" he asked when I didn't respond, and I just shook my head and giggled.

"It would probably be a good idea, though," I said in reply. "Because I'm planning on doing a lot more of that."

And I did. After pulling my panties back on, and waltzing out of the doctor's office with a prescription for birth control in my hand, I meant to head straight for the pharmacy, but a particularly attractive construction worker caught my eye, and after I'd approached him and asked why he hadn't cat-called me, a few minutes later we were tumbling into a half-built room, his pants around his ankles, and my bra in his hand...

After the construction worker, it was a businessman I passed on the street, then a man selling hotdogs who knew where the nearest public toilets were, and then taxi driver who I'd hailed because I thought he looked cute. Finally, when I got the taxi-driver to drop me off at school (leaving him my extremely damp panties as a tip), my pussy was starting to feel a tiny bit sore.

Another side-effect of having big boobs, I thought with a sad shake of my head. Small-chested girls have no idea how easy they have it...

When I arrived in school, lunch was just wrapping up, and I couldn't help but notice, as I wandered into the cafeteria, how many stares I was drawing. The uncharacteristically short skirt, the ruffled sex-hair, the unrestrained breasts...(I'd offered the construction worker a blow-job in return for getting my bra back, but he was exhausted after our two quick, messy fucks. He'd offered to just give it back, but that didn't feel like a fair transaction to me, and so I'd let him keep it.)

I've got to tell you, it put a bounce in my step, and as my heels clacked across the floor, I found myself heading straight for Patrick and his friends.

"Hey," I said, sitting next to him and putting one hand on his leg. "Can I ask you a favor?"

The huge footballer looked at me with a half-smile on his face, and glanced around at his friends.

"This is...uh..." he said, attempting to introduce me, but I dismissed the formalities with a wave.

"It doesn't matter. Could I speak to you? Alone?"

He was already getting up, but I wanted to make my point, so I leaned over and whispered in his ear.

"I don't really want to talk...it's about sex."

A few minutes later, Patrick had found us another empty classroom with the lights off, and my arms were in his hair, his tongue halfway down my throat.

"I want you..." I moaned, and knelt down in front of him. "I need you..."

This time, however, I didn't take his cock in his mouth - though God knows I wanted to. Instead, I just jerked him off. I've never actually done this before, I realized as I stared adoringly at his cock, while my small hand pumped it over and over. It was beautiful, in many ways - seeing his veins pulse and the head of his cock intensely throb as he got closer. Finally, recognising that he was close, I turned around and aimed him at myself, hitting my own rear entrance with his seed.

"What was that about?" he asked as I smiled with triumph. I looked up at him, and told him what I'd really brought him here for.

"I want to you to take my ass...but I've never done it before. Can you help?"

His cock plumping up again in my hand was all the reply that I needed. From my conversation with Marty that morning, I knew that anal sex was something I was expected to do a D-cup, but that wasn't why I was so interested...honestly, it just seemed exceptionally practical. My pussy was exhausted, after all the men I'd taken, but I wasn't ready to stop yet - I wasn't even close.

The ass was new territory, which excited me in itself, but more importantly, it meant that I could probably take another four or five men before having to call it a day...at least.

In retrospect, I've no evidence that Patrick knew what he was doing, but if it was his first time as well, he certainly hid it well. He didn't just shove it in, like a lot of men would have - he turned me around, kissed me, and then reached down between my legs and played with my clit for a few minutes.

My pussy was sore from the day's pounding, and my clit was slightly desensitized, but his fingers running over the slick nub still felt amazing, and when his other hand started gently twisting and pulling my nipple, the combination sent ripples of pleasure through my whole body.

He leaned in and started talking directly into my ear:

"You like that? You like your little body being used by a big, strong man?"

I just nodded, and gasped as he roughly pulled on my right nipple.

"You're such a dirty little slut...I can feel that I'm not your first man of the day, you know that? You've had someone else cum inside you, haven't you?"

I nodded again, unable to think clearly enough to lie. A part of me was worried that he'd be grossed out, knowing that he was touching another man's seed, but when he didn't seem to react, I threw my head back and took another ragged breath as I realized what a slut I'd been that day.

"More than one man?"

I nodded.

"How many?"

"Five," I croaked, and felt Patrick bite my neck at the answer.

"God, what a dirty little whore you are...and now you want to be fucked in the ass, by a boy who you only met yesterday. You're a filthy little tramp...and I'm going to use you like one."

Without me realizing what he was doing, Patrick had turned me on and utterly relaxed me. He kept talking dirty to me as his left hand moved behind me, lubricated a few fingers on his own cum, still wet on my ass, and slowly slid a finger into my one remaining virgin hole. I was too horny to resist, and after a few seconds, a second finger joined the first.

"I'm going to take your ass," he said, and I nodded, pleading with my eyes, too turned on to even speak.

Running his cockhead up and down my pussy a few times, catching some of the cum that was steadily dripping from my slit, Patrick waited until his cock was well lubricated, and then placed it at the rosebud of my asshole.

"You're mine," he whispered into my ear, and all I could do was agree...

It didn't hurt, not nearly as much as I'd worried that it would. It was more like an intense pressure - I could feel my own ass expanding to accommodate his girth, and it felt amazing.

Honestly, everything about the situation was turning me on, and it all combined to leave me panting with pleasure after just a few seconds...I loved being Patrick's schoolgirl slut, I loved having him take my ass...I especially loved the small moaning sounds he made, showing exactly how he turned he was by his girth slowly filling up my ass. He never let up - he just kept on slowly sliding forward, fucking his own cum into my ass, as I moaned and shook.

I'd never felt so full in my life. I was almost having trouble breathing, so intense was the feeling. It took more than five minutes before he was finally all the way inside me, deep within my rectum, and he leaned forward and whispered in my ear again when I felt his balls bouncing against me.

"And now," he said, "you're fucked."

It would have been easy to be scared, but my nervousness just turned into arousal as he pulled almost the whole way out, and then plunged his thickness inside me, again and again. He didn't go easy, and I didn't want him to - at one point, he put his hand over my mouth, just to stop the wailing of pleasure and dirty words that I was emitting.

The stimulation was unlike anything else I'd ever experienced - it wasn't like being fucked, although it certainly contained the same elements of being repeatedly filled up and empty. The rubbery feel of his cock on my ass was nice, but it was the pure dirtiness of what we were doing that was really getting me off.

I was getting fucked in the ass. I was a little schoolgirl ass-slut, and I was loving every second of it.

It was less than a minute before I felt my first orgasm beginning to build - as if he knew my body as well as I did, Patrick increased the stimulation on my clit. He'd never stopped manipulating it, not for a second, and now he could feel that I was getting close to cumming, he rubbed it faster.

"Are you going to cum?" he hissed in my ear, and I nodded frantically. "Are you going to cum from having your first cock in your ass?"

"Oh god, Patrick..." I said, the second his hand pulled away from my face. "Please..."

"Cum, my little slut," he spat, and it was all that I'd been waiting for - my climax seemed to go on forever. Patrick didn't let up, he kept ramming my ass as I saw stars, and when I was done, I realized that he'd been filling my ass with his seed as I came.

I collapsed onto the floor of the empty classroom with a smile, and when I opened my eyes, Patrick was looking down at me. I could imagine exactly what I looked like - skirt bunched up around my waist, my huge D-cup tits exposed to the world, cum dripping out of both my holes...

Patrick, in contrast, hadn't even gotten undressed. He didn't say anything as he left, and it was a few minutes before I had the energy to get up and return to class.

Now that I knew what I was doing, I wondered how many more men I could take in my ass before I got too sore to continue...

I truly loved being a D-cup.

Friday Morning:

I woke up with two worries: I was afraid that my holes would still be sore, and that my tit-size would have grown once again...

I was half right.

The D-cup bra that I'd bought yesterday was already too small for me, but my ass and pussy felt great. I pirouetted in front of the mirror, admiring my ample rear - had it, too, grown? - and wondered why I wasn't sore. Maybe Marty would be able to...

Marty.

The second that my brother's face popped into my head, my pussy grew wet, and my nipples perked up. I was an E-cup now, at the very least, and that meant...oh god.

I was a freak. I was the kind of girl who'd sleep with my brother without a second thought. Hell, I'd only been awake for a few minutes, and already the idea was incredibly appealing...

Collapsing backward onto my bed, I tried not to think about my brother in a sexual light. He was just my brother, I told myself, and just because my breasts were one size bigger was no reason to stop thinking of him as a sibling...all I had to do was remember that he was just my sexy older brother, and nothing more.

Wait, no. Not sexy. That wasn't what I was trying to...

I shut my eyes and took a deep breath. Here was what I was going to do: I was going to get up, go downstairs, and sit down in front of my brother. I was going to try to ignore the way he'd inevitably stare at my tits, or the way that my body would respond...I wasn't going to let his long, lingering glances at my chest affect my behavior.

I certainly wasn't going to pull my shirt up and let him have a look. My body was not there to please my brother, and when I saw the outline of his erection pushing against his jeans, I wasn't going to get down on my knees and fish it out, wrap my lips around it, and let Marty fuck my face until he was shooting his precious, precious cum deep into my throat...

Somehow, while telling myself what I wasn't going to do, my hand had slipped between my legs, and started stroking up and down my sensitive pussy-lips. At least, I thought, my other hand was just resting casually on my breast, and not pulling at my nipples...although, of course, my new E-cups were apparently so sensitive that just resting there was enough to get me excited.

A few seconds later, I was cumming around my hand, wondering if my brother liked going out with D-cup girls so that he could take their asses. After Patrick and I had finished up in the empty classrooms, I'd managed to persuade two more footballers to sneak away with me and take my ass, and then when I'd gotten home, I'd noticed my forty-year old neighbor staring at me as I walked down the sidewalk.

Staring was rude, but somehow if felt like it would have been more rude not to take him inside and make him fill my ass up with his seed. Twice.

After that, it had been a relatively quiet evening. I'd spent slightly too much time experimenting with various phallus-shaped objects around the house, and had quickly discovered the delight of double-penetration. Believe me, you haven't known masturbation until you've had a cucumber up your butt while slowly sliding a glass rolling-pin inside your freshly-shaved pussy...

I shook my head. I was getting distracted. I'd had a nice morning masturbation session, and that, surely, would be enough to ensure that I could hang around my brother without getting fixated on the long, smooth cock that he was hiding beneath his pants...

Just as I'd expected, Marty stared at me as I descended the stairs. I was wearing a vest - normally it would be worn over a shirt, but none of my clothes would fit over my enormous new bosom, and so I'd decided to wear the vest by itself. It didn't expose anything...unless, of course, I moved.

(I was making sure to move as much as possible.)

At the back of my wardrobe, I'd managed to find an insanely short skirt...actually, I believe I may have bought it to use as a belt. Whatever the original intent, it really showed off the curves of my ass, and my pussy mound. It went really well with the platform shoes that I'd borrowed from Mom's wardrobe - I don't think she'd worn them for more than twenty years, but luckily for me, she never throws anything away.

Marty gaped at the sight of me, and when I was at the bottom of the stairs, I wrapped my hands around his torso, pulled him toward me, and passionately kissed him good morning. For all his smooth moves with his nightly dates, he didn't seem to have anything to say to that, and it was only when I pulled out of the kiss that I remembered that a few minutes of making out wasn't our standard sibling greeting...

Crap.

Reluctantly removing Marty's hands from my mostly-exposed ass, I sat down on the stool, and tried to think of what I'd have done on any other day. My tits were interfering with my thinking, however, and making it hard to remember what was normal and what wasn't. A nice, normal, sister-to-brother blow-job? Did he normally spank me, to break the ice? Or did we just skip the formalities and go straight to him sliding that cock inside his sister's cunt, pumping in and out until I was full of his cream...

I shut my eyes and tried to remember what Marty's cock tasted like. I could imagine it easily enough, but I couldn't remember the flavor, and that was the clue that I needed - I didn't normally blow him.

When I opened my eyes again, I realized that my vest had flipped open, exposing my pink nipples to Marty's touch. He was standing in front of me, caressing them in awe.

"Are they..." he said, and I just nodded.

"So you're..."

I whimpered with need.

"Should we..."

He didn't need to say another word. His careful fondling had brought me almost to a peak, and I knew that I had to have him inside of me. I barely cared which hole he used, falling desperately to my knees in front of him, unleashing his cock...I was an E-cup, and that meant that I didn't say no to anything, anyone...I needed his cock, and I needed it now.

Marty looked down at me with a surprisingly smug look on his face as I slurped and slobbered all over his cock. He'd had so many bimbos in the past few weeks, I really hoped that I could compete...one of his hands was still fondling my breasts, and while I desperately wanted to pleasure myself as I blew my sexy older brother, I wanted to make sure to give his hardness my full attention.

Without breaking eye-contact, I slipped his cock into my mouth, further and further. Just like in my fantasy that morning, I took his member deep into my throat, carefully suppressing my gag reflex, letting my brother fuck my face, use me as his little cum-slut...

To my surprise, he didn't unload into my mouth as I'd been expecting, instead ordering me to turn around. He didn't take my skirt off - there was no point - and I hadn't worn any panties, so nothing got in the way as he slowly sunk his hard dick deep into my dripping wet pussy.

"Oh, Marty..." I moaned, as he continued to play with my nipples while fucking me over the kitchen counter. "Oh, big brother..."

Pan2
Pan2
496 Followers


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