Now, thought Kyle, is my chance to do something incredible!
With a force of will, he planted his will into Jen's head. For this moment, she became a slave to the commands Kyle was giving her.
'Don't do this, please.' She begged in thought.
'Do as I command my toy, or I'll turn you into a puddle of slime. Come to think of it, I'll log that away for later hehe.'
'You're sick.'
'I know, now move!'
Jen shot off the couch. In the time it took for the words to finish coming out of her sister's mouth, Jen was already pressed against her.
"Shhh Katie, everything will be okay if you just be quiet."
"But what the fuck? Is that Sam?"
Jen winced as Kyle's seeded commands took over. She stared into Katie's eyes, and then grabbed her around the mouth. She grabbed hard, and harder still, then with a tug, smeared her skin across her face. Katie's mouth was no more.
"Oooh, that's hot." Jen cooed, and licked and kissed the area that used to be her sister's mouth.
Katie was 18, and Jen's younger Irish twin. Both were held back in school when they were younger, but that just meant they were both party animals at this age. The antics those two girls had gotten into over the years were plenty, but nothing could have prepared either of them, for what was about to happen.
Sam came over, stroking her dick over the now kneeling form of Katie. Jen knelt beside her, still molesting Katie's face. Tears poured down the younger girls face as she looked around at Sam and Jen.
"You like Sam's cock Katie? Well... as luck would have it, you may just be getting one of your own... so to speak." Jen grinned wickedly, but inside, she was screaming. Her hands moved of their own volition (no, Kyle's volition), and began removing clothing until Katie was naked. Then, she started rubbing her all over. To Jen, it almost seemed as if her skin was liquifying. Katie sat in a trance as her body was taken control of.
Jen grabbed her arms, rubbing them gently as little strings of flesh ran across them. Then in a single motion she pressed them into her sister's sides, obliterating her arms completely. Then she began working on her breasts, large and delectable, she suckled them briefly before smoothing them over and molding them into her stomach and shoulders. Soon, Katie was just a fleshy mass, with a head and no mouth. And yet, Jen continued. Organs vanished or were placed elsewhere to make room for new ones. Katie's breathing tube reworked itself through her body, extending to where her legs used to be, now fused with her butt.
When she was nearly done, Sam snickered. Despite the conflict in her brain, she could see exactly what Jen was doing. Katie, was becoming a cock. Large, veiny, sexy, and oh so delicious. This is when Jen positioned herself accordingly, and "put on" her sister. Her flesh oozed and fused into Jen, replacing her pussy with Katie's being. Katie's nose was now her pee hole, and with a similar gesture as before, Jen smeared her hands over Katie's eyes and erased them as well.
Katie was now a giant 2.5' cock that belonged to Jen.
"Okay Sam, bend over. I'm shoving her up your ass!"