Sister Sally pt 3

I was so ashamed of that night that I dedicated myself to ignoring my sister’s growing physique to the best of my ability. I flat out refused to help Sally inject herself, and did my best to stay away from her. I even found a girlfriend. Sally did not take this rejection well - she would leave the house before me every morning and wouldn’t get home until way late. 

Our parents were worried but what could they do? She kept up her grades and didn’t cause trouble. So they ignored it. And so did I. But little did I know, my rejection had fueled Sally’s muscle-lust even further, and she became determined to get so muscular that I couldn’t possibly ignore her.

I came home one afternoon to what I thought was an empty house, as our parents had gone away for a long weekend. When I entered, I heard sounds coming from our parent’s room. Was that… moaning? Wait, that sounded like Karen, my girlfriend…

I crept up the stairs and focused my hearing toward my parent’s bedroom door. I could tell it was left half open, but I couldn’t yet see inside. 

“Oh fuck yessss!” I heard, and it was definitely Karen. “You’re so huge!” 

She was cheating on me? In my own house? I was angry and confused, and rushed over to the door.

What I saw stunned me so fully that I couldn’t say a word. There was my sister, a naked mass of bulging muscle, bigger and more muscular than I could have imagined, bucking her hips on top of Karen’s naked form. Karen’s big tits bounced as she held them, pinching her nipples, practically drooling at the sight of Sally’s gigantic, muscular form pumping on top of her.

That’s when I noticed it. Right there, protruding massively from Sally’s mid-section and plunging in and out of Karen’s sopping wet pussy, was a huge, muscular cock.

I gasped when he saw my huge, muscle-bound little sister grunting and licking her lips as she flexed her massive body in a frenzy of muscle-bound fucking. Her sheer bulging size dwarfed Karen’s form as she slammed her huge cock into her, and she moaned. Her massively muscled shoulders bunched like boulders. Giant veined arms bulged obscenely, and her massive chest looked pumped to bursting -- so huge, so muscular that she no longer had any semblance of breasts. Just pecs so thick that her nipples pointed straight down, and they jutted out over Karen’s head. 

I watched Karen feverishly massage my sister’s massive, bulging body all over. Karen’s hands were everywhere on her -- as if in disbelief at the size of the gigantic, freakish muscles bulging from my sister’s chemically-fueled super-body. Moaning, Karen felt Sally’s thick neck and massive shoulders. 

Confused, yet so turned on at the erotic sight in front of me, my dick groaned as I watched Karen squeeze Sally’s huge, bulging biceps, and I almost moaned out loud as Karen greedily licked Sally’s gigantic, striated pecs. Every muscle on Sally’s body stood out etched and gigantically swollen easily three, four times as big as any I had ever seen.

"Oh Sally,” Karen moaned, "you're so huge, so unbelievably huge, I can't believe how huge you are! So much bigger than my boyfriend!" 

That was when Sally looked up and saw me. Then she laughed, her muscles bulging, without breaking the slow, deliberate, unbelievably sexy grinding of her hips. Our eyes locked, and she grinned. I had never seen her like this, so utterly powerful, so completely and utterly dominant. Every move of her body radiated arrogance and power, lust and strength. 

“What can I say, brother?” Sally said, her voice a full octave lower than I remembered. She continuing to pump her massive cock in and out of Karen, not missing a beat, and continued “When you started ignoring me, I had to find someone else to worship my huge, thick muscles!” She flexed her huge, bloated bicep and looked at it with a sultry grin. 

Then she looked back at me and said, “Did you know your girlfriend had such a freaky muscle fetish?” She bucked her hips hard, and Karen moaned, “Oh god, so huge!” 

“Besides,” she continued, still fucking Karen slowly, “when you wouldn’t help me inject the ‘roids, I needed somebody for that, too! And Karen was totally willing, especially after I started growing some fun side effects...”

My eyes widened as her eyes dropped, suddenly focusing on the pair of huge, unbelievably swollen balls bouncing between her rippling, muscular legs. Then I gasped as he caught a glimpse of the size of her slick, gigantically engorged cock stretching Karen’s pussy. I felt dizzy. It was unreal. Sally followed my eyes down to what I was staring at, and she laughed again.

“What's the matter, bro," she said.  “Never saw a cock this huge in action before?" She laughed a deep, totally masculine laugh that almost made me cum instantly.

In one motion, she leaned back, muscles bulging as she kneeled upright on the bed, her massively muscled thighs spread wide apart. Her enormous cock slid wetly out of the now wildly orgasmic Karen. Sally laughing at her own unbelievable power. I almost passed out as I saw the huge engorged pole bounce into the air. Dizzy, I heard the hard wet slap it made as it swung up and slapped against her outrageously muscled chest and abs. 

A part of my brain was aware that my musclebound sister was laughing, thrusting her completely exposed crotch arrogantly into the air, displaying it, reveling in it. Her cock was obscene, immense. I had never imagined anyone could grow so huge, so incredibly big, certainly not my sister. It stood completely straight, like the swollen trunk of some impossible tree, knotted and bulging with ropy veins. It reached all the way to her bulging chest, its massive helmet-shaped head drooling precum in gobs and runnels of semen, running down past her proud, arrogantly thick pubic hair, down into a pair of enormously huge and heavy balls utterly mind-boggling in their sheer size and weight. 

Still laughing, Sally looked down and grinned at her own erect hugeness, her hands balled into mighty fists at her side. With a glance at my open, astonished mouth, she laughed out loud.

“Just try to ignore this, bro!”  she said as she bent her neck and lovingly began to lick her own massively engorged head. I stumbled backward, my mind on fire. I watched Sally’s long curling tongue dart in and out of her own huge piss slit, her gigantic cock bloating and lengthening to even more mind-boggling proportions as she fed on her own erect hugeness, groaning, precum spooling out of his enormously swollen cockhead and over her lips, dripping down her huge bulging shaft and onto her monstrously grown balls. 

I reeled as he heard the hot, indescribable sound of Sally’s hot wet mouth struggling over her own jaw-splitting cockhead. Our eyes met again as I watched Sally slowly and relentlessly pump her own enormous cock down her throat, hips picking up speed, her huge musclebound arms still bulging at her sides as she worked her powerful young body like some powerful piston, methodically and effortlessly fucking her own face, her massively inflated balls flopping and slapping between her legs.

“Oh my god," squealed Karen, coming round again, only to build into another volley of unstoppable orgasms at the sight of the enormously hung muscle-kid in front of her, covered in freakishly huge muscles as she sucked her own gigantic cock.

“Oh god, look at her, look at her, Jessus, she's so huge! So fucking HUGE!!" I stumbled back into the hallway, my pulse racing and my heart beating wildly. I heard Sally’s booming laugh behind the now safely closed door. Then, a moment later, the unbelievable sound of what could only have been Sally’s deep and earthshaking roar of pleasure as her massive, monumental orgasm echoed through the house.