Yes. Sarah is a powerful muscle goddess. There is just one catch.

Before Adam stood his sister. Now a hulking amazon muscle goddess, at least 6 feet in height, if not more. Her bloated belly, full of tainted "Growth X" cum was completely gone, all spent in the transformation of her body, replaced by a rippled six-pack. And it looked like this was finally the end of it. The end of his sister's transformation. Sarah should have probably stopped for a second, and should have asked herself what the fuck just happened. But all that mattered for her "Growth X" enhanced body was her pleasure.

And Sarah's hadn't achieved climax yet. She continued to masturbate, continued to pleasure herself. Feverishly, tirelessly, fisting herself, rubbing her pussy and engorged clit, squeezing her newly grown humongous breasts, tweaking and pinching her thick and unwieldy nipples. Groaning, moaning, in a combination of frustration, of her denied release, and ecstasy, of previously unknown pleasure made possible by her new "Growth X" enhanced body. But something was wrong. Something was missing. Despite all of her efforts, she was denied the relieve that she strove and longed for.

Luckily, it didn't take long for Sarah to figure out what it was. It had been right in front of her all long. She had been looking right at it the whole time. Her brother's extraordinary and irresistible eleven inch cock. With large steps she strode forwards, and with a power that she didn't yet know how to wield, she pushed Adam's backwards. She had just intended to push him down onto the bed, but to the equal surprise of both Sarah and Adam, the young man was sent flying backwards by the push of his amazon sister. Back over the the full length of the bed, which he hit only shortly before touching the wall.

"Uups! Sorry!" Sarah giggled, simply amazed by the strength that she possessed, and totally unaware of the possible fatal consequences her unintended action could have had. And before Adam knew it, his sister had lunged forward towards him. The bed creaked heavily under the pressure, as the vast mass of muscle landed on top of him and pinned him down. Adam, still amazed and overwhelmed with the beautiful and powerful muscle goddess, was stunned into inaction, but still he clearly felt his hulking erection. His lengthy shaft was trapped and pressed between the enormous valley of flesh that were his sisters expanded tits, and all that was left to see of his sizable boner was it's precum smeared tip poking out of Sarah's cleavage. And his sister lost no time. With her legs positioned next to her brother's in comparison now scrawny body, she straightened herself up. Free of its constriction, Adam's big and fat cock immediately surged upwards.

"There it is!" Sarah looked down on the object of her desire. It was all that she wanted. She knew that it was all that she needed to finally get some release. She grabbed for it, and aligned it's head with the entrance to her pussy, that was already overflowing with the juices of her arousal. With all the **** that she could muster, she slammed down and the whole beefy shaft disappeared inside her in only one motion. She moaned, and her face turned into an expression of bliss.

"Yesss!" Both siblings exclaimed in unison during the penetration. The feeling of fullness. It was almost enough. But just not yet enough. A tiny bit was missing. Sarah looked down at her brother, who looked up at her and marveled at her muscles. Adam had an average body, but he appeared so tiny, small and skinny compared to her now. Now, that she was a walking mountain of muscle. But that didn't matter for her. She knew what she wanted of him. Yes, his cock, that was already deep inside her. And only one additional thing was missing: His cum!

And judging by the admiration for her prowess that she saw in her brother's eyes, Sarah had just the idea how she could take him over the edge and get the intoxicating and addicting juices that she craved.

Adam, who looked up at his amazon sister: She arched her back and raised her arms. Her hands closed to fists, her underarms and hands pointing straight up, putting the attention on her flexed upper arms, her bulged biceps. She was truly a goddess. A muscle goddess, who continued to flex her immense and powerful muscles, her chest with mountains of bewitching breasts, who started to wiggle, jiggle and shake. Her unreal mass of flesh, her powerful body towering over his own.

Sarah, who looked down at her brother. Yes, skinny and scrawny, but with his outstanding erection. His big cock, that started to swell even further, to throb and pulsate. And as steam after stream of "Growth X" were shot deep down inside her pussy, Sarah immediately and finally achieved the climax that she had been waiting for. And she came violently.

Not much later: Again and again, Sarah slammed her entire weight of her massive body down on her brother's still erect pole. The bed creaked loudly with every motion, and Adam was certain that it was about to break. Or that he was about to break.

Hours later: The bed was already long broken, but Sarah had continued her **** and her pussy had milked Adam's erection for every possible drop of cum. He was entirely spent, yet Sarah wanted more. She massaged his balls, slurped and sucked on his cock. Kissed it's tip, caressed its entire length. She even took the entire thing down her throat. But it wouldn't get hard again. Not for several hours.