Big Tits Theory - Cover

Big Tits Theory

Copyright© 2019 by Pan

Chapter 7

Incest Sex Story: Chapter 7 - 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  

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.

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