Zack walked towards her father's cock and got onto her knees. She needed no more coercion, she immediately grabbed the cock with both of her tiny hands, kissed the tip of the cock, then eagerly and lovingly went to town on her daddy's member. The two moaned in unison, as she swiftly and expertly worked him like a pro. A little girl is made for her daddy, to pleasure her daddy, to make him happy, to have his babies, to give him daughters, to give him a harem of little girls. These thoughts echoed through Zack's mind over and over, "Why didn't I become my son's daughter sooner!? I could have had babies at my breasts and several in my womb by now! I need to make up for lost time!" these thoughts made Zack unbearably horny, but also imbued fear into his heart. He wasn't a girl, he was anyone's daughter, Mason wasn't her daddy whom she needed to please for all eternity. Only he mattered, she had her own wants but they were silly childish things. Daddy knew best, she should ask her daddy why she felt so weird in her head. But first she needed daddy's cum. Zack worked her daddy, swallowing every drop of his cum until he was dry. Mason realized he wouldn't have any more sex unless he made a few...."modifications" to himself. But he was winded, he decided that the best way to break his father would be to make him "upgrade" his own son into his perfect daughter fucking machine. "Zack sweety, there's a computer downstairs, daddy is too tired to go down and mess with it, would you be a doll and go down there, and change daddy into your dream daddy? Your perfect stallion with infinite stamina and cum for you to swallow and get inside you?" Zack tried to resist but she...he......she knew she needed to obey her daddy, please him. Plus that would mean more cummies from daddy, more fun, more pleasure, and more BABIES! Little girls love babies, almost as much as they love their daddies. "Okay daddy!" Zack happily and obediently said. She went downstairs and found the computer. Zack realized this is what had changed him. If he could just muster up the willpower he could undo all of this!