Big Tits Theory - Cover

Big Tits Theory

Copyright© 2019 by Pan

Chapter 4

Incest Sex Story: Chapter 4 - Marty tells his sister about a theory he has - the "Big Tits Theory" - while feeding her body-altering, mind-bending milkshakes.

Caution: This Incest Sex Story contains strong sexual content, including mt/ft   Ma/ft   Teenagers   Hypnosis   Magic   Mind Control   Heterosexual   Fiction   Incest   Brother   Sister   Anal Sex   Exhibitionism   Masturbation   Oral Sex   Pregnancy   Sex Toys   Tit-Fucking   Voyeurism   Big Breasts   Body Modification   Doctor/Nurse   Public Sex   Teacher/Student   Transformation  

Thursday Morning:

I woke up, and was unsurprised to discover that my bra, despite being brand new, didn’t fit.

After school the previous day, I’d finally made my trip to the mall. A quick fitting had confirmed my suspicions - I was a large C, but still a C-cup. I’d put a bra on, breathed a sigh of relief when it relieved the stimulation from my nipples, bought it and returned home just in time to see Marty off on another date.

I was getting pretty good at estimating bra-sizes by that point, but I didn’t even need to - he mouthed “D” to me as he left. She looked strangely familiar, but it didn’t click until a few hours later - it was one of Marty’s old teachers. She’d been at the school when I started, but I’d never had any classes with her, and she’d left to get married a few months later.

Oddly enough, in my memory she was extremely flat-chested ... but of course that had been before I paid attention to such things.

I’d spent the rest of the evening masturbating, stopping only to try on my bra and sigh in relief when it still fit. It was increasingly tight, yes, but I could definitely still get it on ... until I awoke the next morning.

I barely managed to squeeze into one of my shirts - my huge new tits filled my top so much that it barely even covered my midriff. That sort of look with pants wouldn’t have made any sense, so I wriggled into one of my old miniskirts, and went downstairs to pick Marty’s brain.

“Wow!” he said when he saw me. “Sis, are you...”

“I don’t want to talk about it,” I said, and unable to stop himself from staring at my tits, he just nodded. “D-cups ... what do you know about them?”

“A lot,” he said, one eyebrow raised, still talking to my breasts. “Are you... -”

“Not now, Marty!” I interrupted, stamping one foot petulantly. The motion rippled through my body, and made my tits bounce ... Marty’s attention was beginning to make me feel warm, but I really didn’t want to think about that right now. “Please! I need ... I need to know.”

“Well...” he said, pulling up a stool and placing a milkshake in front of me. “Where do I start? D-cups are easy ... really easy. Like, look at them the right way and they’ll fuck you easy.”

I took a sip of the impossibly delicious milkshake and swallowed nervously as he continued.

“There’s pretty much nothing that they won’t do - anal, pearl necklaces, spanking ... you name it, they get off on it. Oh, and they take any excuse ... and I mean any excuse to get their kit off. They enjoy themselves, too, in my experience. They cum like firecrackers. The smallest thing will set them off. Yeah, you gotta love D-cups ... they’re always up for it.”

I nodded, and then a horrible thought came into my head.

“And ... Marty?” I asked softly.

“Mmm?”

“What ... what do you know about E-cups?”

“Oh, E-cups are total freaks. I tend to not even mess with them ... when you get up to E-cups, you’re looking at porn stars, that sort of thing. There’s nothing an E-cup won’t do ... hell, they’ll probably even fuck their own family, given half a chance.”

My eyes widened in shock. I had to find out why my tits were suddenly growing, and stop them ... before it was too late.

I gulped down my milkshake, and ran out the door, feeling Marty’s admiring eyes on my legs as I left.

The decision to skip the first few classes of the day was an easy one, now that I knew what I was. Hell, I would probably have gotten to school and dragged some boy into the bathroom with me, and just let him bang me throughout the first few classes anyway ... the thought was appealing, but I had to remember - I was on a mission.

First stop: the mall.

I ran into the lingerie shop I’d visited yesterday, avoiding eye contact with everyone. My cheeks burned red as I realized that everyone, everyone was staring at the girl with the huge rack and the long legs and the high heels - why had I worn high heels? She was the kind of girl who you could tell was easy, a girl that drew everyone’s attention ... And that girl was me. If I looked up, I knew that I’d catch some guy’s eye, and a few minutes later we’d be in the back seat of his car, and I’d be getting pounded like I so desperately needed ... No. Had to concentrate. I got into the lingerie show, relieved to find that it was a girl at the counter. She looked at me with a strange mix of disgust and professionalism, but it was obvious that she didn’t want to fuck me. Which was almost a pity, because I’d never been with a ... focus! Focus. I was here to get a bra.

I grabbed the first D-cup that I could see, and in the changing room, sighed with relief. It fit. A tiny bit snugly, but I was definitely a D-cup. I went to buy it, but couldn’t resist going with the more transparent option ... if my shirt were to accidentally come off, I’d hate to be embarrassed by my boring brassiere, after all.

Once I was out of the bra store, my tatas receiving slightly more support, I relaxed slightly. Next stop: a medical professional.

As I marched into our family doctor’s office, I was relieved to find that he hadn’t replaced his secretary - for as long as I’d been going (which was since I’d been a little girl) Ms Weiser has manned the front desk. A part of me had been worried that the professional older woman would have been replaced with someone younger, maybe a body-builder working at the doctor’s office part-time.

I’d feared that as soon as I entered, he’d throw me a smouldering glance, tell me that the doctor was out, and that I’d uncontrollably step toward him, our eyes locked, until I leaned across his desk, showing off my now-ample cleavage ... he’d brush everything aside, expense be damned, and throw me down, kissing me passionately, and fucking me so hard that I’d have trouble walking afterward ... So when I saw that my fantas- ... that my fear was misplaced, I sat down, disappointed, and waited for Dr Lorne to see me.

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