Alex 6

Alex was in the basement, where she had constructed a home gym with the kind of weight she needed to reach the next level. She wore a tight spandex top and a lycra thong bottom.

Grunting from the effort of curling 95lb dumbbells, she didn’t hear Ken sneak down into the basement. He stared, wide-eyed, at the incredible beast of muscle his sister had become.

Then Alex suddenly dropped the weights with a crash. She gunted and flexed both of her toaster-sized pecs. They engorged and surged forward, stretching the spandex top until it tore. Ken gasped as her rippling, striated pecs surged in cabled relief, bloating to the size of two toaster-ovens, and her top tore right off.

“Oh my god,” Ken exclaimed.

Alex smiled, finally taking notice of Ken, and the mighty boner that was tenting his shorts. She stood tall and flexed her abs, bucking her hips. Her bulging abdominal wall stretched the waist band of the lycra, and the front of her bottom became practically translucent.

Ken could now clearly see through the fabric the thick, bulging pussy lips that formed her musculed cunt. A lesser man would have puked at the sight, overwhelmed at the extent of her muscular development, even there, at her muscular cunt.

Alex grinned like a mad woman as she flexed her pussy lips and they bulged. Alex moaned. Her cunt spasmed and belched more juice, soaking the front of her bottoms. Stitches popped as the thong stretched to contain her flexing cunt muscles. Suddenly, with a snap, the thong shot off.

Ken stared, slack jawed, at the inhuman display. Alex strode forward, grabbed his waist, and lifted him off the ground. Ken almost cummed at the inhuman display of muscle. She tossed him down onto the weight bench, grabbed his shorts, and tore them in half, exposing his huge member. Then and there, she mounted him.

Ken moaned as she mounted him. She flexed into a double-bicep pose, and her massive biceps and triceps bloated to inhuman proportions. Her biceps engorged with mass, looking like striated, football-sized piles of worms.

“Tell me Ken,” she said, slowly sliding her thick pussy up and down his cock. “Am I big enough yet?”

“Unngh,” Ken moaned. “Nooo!”

Alex smiled a big shit eating grin. She locked eyes with him, while she continued to hump.

“I knew… unngh yea…you’d say that…” she said, continuing to sensually hump Ken’s cock.

“I’m not nearly big enough…. Nngh!” she cried. “I’m going to get even huger!” Alex moaned, thrusting on Ken’s cock harder and faster.

“BIGGER THAN ANY BODYBUILDER, MALE OR FEMALE!” she cried as her pecs surged into Ken’s face.

Ken moaned, crying “yes, more, bigger!”

She crunched down into a most muscular as she pistoned herself on Ken’s raging cock. “BIGGER THAN A FUCKING BULL! BIGGER THAN A GOD DAMNED GORILLA!”

Ken moaned louder, lost in his sister’s muscle-growth trance, willing her to grow even bigger. “YES! MORE!” he cried.

Alex’s pussy started spasming. “OH YES!” she cried. “A BIG BUTCH BEEFCAKE! A HUGE, MEAT HEADED MONSTER! A SUPER ROIDED MASS OF FREAKISH MUTANT MUSCLE!”

Alex’s muscles rumbled and bloated. New striations appeared and new bulges bubbled to the surface as she seemingly grew right before Ken’s eyes. Ken lost it, orgasming wildly. His cock bucked and pumped it’s massive load into Alex’s muscular snatch.

Alex absorbed his cum, seemingly bloating bigger and thicker, engorging with his cum. Her traps swallowed her neck, and her pecs surged like two gnarled, mutant heads.  Her quads bloated bigger, enveloping Ken’s lower body and dwarfing his waist. Her lats bulged to the sides, inflating like huge meat wings, lifting her arms.

“OH FUCK YEAH, I’M A ROIDED UP MONSTER! AND I’M GONNA GET EVEN BIGGER, EVEN FREAKIER! I’M GONNA GET SO JUICED UP THAT I’LL BE THE MOST MASSIVE BUTCH-ASS BITCH ON THE PLANET!” she cried, her overly muscled cunt finally succumbing to the eroticism of the moment, and it gushed with juice as her cunt muscles spasmed.