Time passed and Kyle began to think, that it didn't work this time, when Sandy suddenly inhaled sharply.
Kyle readied himself and soon he could feel his sisters body responding. Sandy was panting hard and with each inhale her muscles grew.
Her already impressive eight-pack pressed against Kyles raging boner while they seperated into a solid ten-pack. Sandys pecks pushed her firm breasts into her brother. He could feel her hard nippels poking through her spandex top, while her breasts grew to the size af two basketballs. Her widening back started to give her already tight spandex a hard time holding together until the sound off ripping clothes could be heard. Kyle, whos hands still managed to stay on the giant back of his sister, brushed over something, that could be described as a layer of silk on top of solid rock.
Meanwhile his situation became troublesome. Sandy still had him in her unbreakable hug and hadn't moved, but her ever expanding body took away all the room for him to breathe. He shifted his focus at Sandys arms. Her biceps measured already 30 inches and there was no sign of stopping the growth.
He started to push at his sister, who was lost in her lust. Kyles struggle aroused her even more. Luckily her grip loosened up a bit and Kyle could free himself.
At last he had the chance to see his sister growing. And what he saw made him almost cum instandly.
Sandys muscle were of gigantuan proportions. Her workout clothes were gone and all that was left, were her pink panties. Her legs were pillars of might, each as big as tires. Her back was too wide to fit through a door and her breasts almost reached the size of beach balls. Her biceps, still unflexed easily measured 40 inches.
Kyle stepped closer to Sandy and started to caress the magnificent, still growing and hardening, body of his sister.
This let Sandys lust overwhelm her and she ripped her pantis in half, as if they were wet paper. Then she grabbed Kyle gently, despite all her presumably gigantic strenght, and lowered him to the ground. His shorts offered no more resistance than her panties earlier.
While Sandy slowly lowered herself on Kyles painfully erect cock, he marveled at the young muscle goddes. He didn't care, that it was his sister and he didn't think he could do anything to stop her anyway.
Sandy guided his penis into her dripping wet pussy. As her mighty, pillarlike legs came to a rest at Kyles sides, she slowly started to rock her hips, while contracting her lower abdominal muscles. It was the best feeling Kyle had his entire life and he came within seconds. Somewhere behind all the lust he felt guilty but it was soon washed away, as Sandy continued her effords.
In the meantime, her bodys growth came to a stop. Sandy straightened herself up and gave a massive double biceps flex.
Her biceps reached her fists and she opened her hands to stroke them. Kyles diminishing erection instantly returned to its max and Sandy, feeling it, gave him a warm and breathtaking smile. She started to kiss and lick her right biceps, while groping her giant breasts with her left.
Kyle felt his wildest fantasys come true and carressed his sisters steel hard abs and glutes.
Sandy increased the pace of her rocking and a loud moan escaped her, then she had an orgasm like never before. She screamed and moaned at the same time and all her muscles tensed and twitched.
Kyle feared of being crushed beneath his sisters mass but she maintained her balance.
After two whole minutes Sandys orgasm started to fade. She looked at her brother and smiled a cute smile free from any guilt.
Slowly Sandy bend over, playcing her hands besides Kyles head. He marveld at the enormous masses of muscle protruding from this small and delicate hands.
She lowered herself closer and closer onto Kyles chest. He felt the soft weight of her giant breasts pressing on him, but it was a pleasurable feeling.
Kyle ran his hands over Sandys glutes, her ass and her back, feeling every striation and definition of her mindblowing muscles.
Sandy playfully flexed her lower abs to stimulate her brothers penis, wich still remained half erect in her strong pussy, then leaned in for another kiss.  indicates the next chapter needs to be written. |
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