Sarah sodomizes Adam's ass

With his doubts washed away, the way forward was clear: Adam grabbed Sarah's shaft with his hands, to feel its warmth and hardness, nodded, and said with determination: "I'll do anything to feel your glorious girl-cock again, Sarah. Anything. Please, i want you to fuck me in the ass!"

Sarah was delighted to hear her brother's agreement. "Good!"

She took a step back, to align the tip of her shaft with Adam's back entrance. Her shaft was glistening and so wet with her precum, that she didn't even think about getting any other lube. And it was not like she needed it. When she trusted her massive mammoth inside for the first time, several inches slid in easily, accompanied by a cry of pleasure from Adam. "Yeeeees!"

It seemed like his "Growth X" transformed body was made to accommodate large objects in his ass, as he felt no pain, only pleasure, and that first penetration was already enough to set of the loaded gun that was his sizable piston. Cum spurts did hit him on his muscled chest, and on his face, as Sarah continued to thrust further and further inside.

Sarah felt incredible as well. The pressure on her fuckstick was immense, very tight, and because of that it felt so very good. Yet she managed to penetrate further and deeper with each thrust. And she especially admired the view: Her own brother, his body transformed and bulging with muscle all over, the epiphany of manhood, of male prowess and domination. Adam's very sizable and powerful tool squirting without being touched, just from the pleasure of taking it eagerly up the ass, moaning like a little slut.

But then Sarah suddenly stopped. Adam whimpered, seemingly waking up from a trance, and looked up at his sister. She looked like an angel to him, with her long blonde hair, the glorious mounds that were her sizable tits, her small waist and fit body, and especially her magnificent futanari rod that was half way stuck inside his backdoor.

"Do you like it? To take a huge cock inside your tight boy pussy?"

"Yes!"

"And do you want to me to continue. Do you want me to fuck you in the ass, hard and fast?"

"God, yes!"

Sarah chuckled: "I knew it. Men are the real pussies!"

And with that, Sarah renewed her onslaught on her brother's ass. With every movement, her tits jiggled dazzlingly. With every push she managed to penetrate deeper, bit by bit. Only to stop from time to time, to ask yet another humiliating question that Adam would eagerly reply to. Anything to get his sister to continue, anything to feel the large futanari rod deep inside of him.

"Then tell me Adam, do you want to be my personal little boy toy?"

"Yes!"

"Do you want take my marvelous girl cock every time i feel like it?"

"Ahhhh, yes!"

"Every morning?"

"Hmmm"

"Every evening?"

"Ahhhh"

"Even at school?"

"Yes!"

"Or in front of my friends?"

"Ahhh, yeees!"

"Yeeeeeees!"

And with that final thrust not only Adam came again, but Sarah as well.

Her futanari cock swelled one last time, as streams of thick white cum burst out of its tip, completely filling and overflowing Adam's love channel and seeping out of his backdoor. By the sheer volume of fluid being pumped inside, Sarah's rod got pushed out of Adam's backdoor.

Free of its constriction the gargantuan girl-cock surged upwards, still ejaculating, still spurting gobs of cum, the white fluid joining together with the jizz of Adam's own formidable member, that continued to shoot exceptional amounts of cum as his extraordinary sizable balls got emptied.

The result of this combined cum fountain was Adam's muscular body being completely covered in white sticky fluid produced by the "Growth X" improved bodies of both siblings.

For Sarah, it was like a dream come true. Ever since that threesome with Amy and Carl, where they used a 10 inch strapon to fuck Carl up the ass, she couldn't stop thinking about how it would be to have a real cock, and how it would feel to sodomize other men. And now her dream had become reality. And it had felt better than anything that she could have imagined.