Sarah can't help it

*What the fuck is going on? Why does Adam look like that? Why is his dick so impossibly big? Why am I getting so wet down there? Why do I want to fuck my own brother? Will I ever wake up from this dream? Is this even a dream? Do I WANT this dream to end?*

Those thoughts were swirling inside Sarah's mind faster than a whirlpool in the rapid waters.

Adam had reached Sarah, towering over her, his gargantuan shaft forming an ominous shadow over her.

"Get up, Sarah." Adam says.

Sarah slowly backs away a little and then stands up meekly, her mind and heart still racing. Her pussy dripping with excitement due to the intoxicating smell of Adam's pre-cum that still covered some part of her face. Adam pulls off the towel around her hair and advances towards her, cornering her against the wall. His massive, muscular arms blocking her escape from either side. His cock nuzzled against her belly, angling upwards and covering the underside of her tits with his clear, sticky pre-cum.

Sarah looked Adam in his eyes, his eyes had a strange twinkle of confidence, determinance and unconcealed lust. Some things that she had never seen in the eyes of her timid, nerdy, wimpy brother. This epitome of masculinity in front of her didn't seem like her brother at all, even though she still recognized his face. He was a different man for Sarah, and she was becoming extremely aroused by just being near him.

Sarah looked down at her brother's huge shaft, it was pushing up from between her tits now, they were now covered in his pre-cum that was freely flowing from his cockhead.

Sarah looks up into Adam's eyes, "What happened to you, Adam? What are you-We can't do this! You're my brother!" She yelps out.

"Don't tell me that you don't like this, Sarah. I have become a better man. It doesn't matter if you're my sister. I want to fuck you! I want to fuck my sexy, little sister. Hard! And judging by your reactions, I know you want it too." With that Adam brought his hand down and plunged his fingers into Sarah's gushing pussy. She practically melted at his touch, and moaned loudly as Adam's thick digits swirled around inside her pussy, soon bringing her to an orgasm. She squirted her womanly juices around Adam's hand, who gladly sucked his fingers dry off her delicious girl cum.

Sarah was beyond reason now, all her thoughts now focused on the throbbing meat, speared between her tits, demanding her attention.

She slowly grabbed the base of Adam's shaft giving it a little stroke, he thrusts his dick further up into her cleavage until Sarah is able to reach it's tip easily. She opened her mouth, tasting the sweet, sticky, intoxicating delicacy that was Adam's pre-cum. She started blowing Adam, standing upright in the shower, his monstrous cock made it all possible.

Adam groaned and enjoyed the loving ministrations of his sister's mouth on his cock. Sarah pumped his cock with one of her hands, failing to wrap around even half of his girth while the other hand followed the rippling cuts of his abs and pecs, reveling in their rock hard strength. She continued licking and kissing Adam's flared cockhead, now pumping his cock and fondling his beefy balls at the same time with her hands.

Adam could feel his release approaching fast. "Uhnngh, gonna cum..." He growled.

Sarah redoubled her efforts, now rubbing Adam's fat dong between her tits, effectively tit-fucking him standing up, all the while sucking at his flared angry-red tip.

Adam feels his balls, churn forcefully in their sack as he prepares to unload his virile sperm all over his sexy, little sister.