"That felt great, Dave, I wish I could always have all of you inside me always. A living dildo butt plug constantly pulsing your hot cream into me. With a pair of vibrating balls resting just outside my hole stimulating me. Forever plowing you in and out of my ass. Wouldn't that be coooooooooooolloooooowwwwww!"
As he had spoke, David realized that he was now in Bobby's control. He should never have given Bobby back his power of speech. David started to change and shrink. His mouth fixed in an "o" and gallons of cum pouring out of his mouth so he couldn't speak. It covered his changing body, lubing him up for what would come next. David became the living ever ejaculating vibrating dildo that Bobby had just described. Then he flew like a guided missile into Bobby's pink rectal opening, just as Bobby said "cool."
Bobby was startled and then grinned as he realized David had lost control. He felt the intruder had pressed no body weight against him, and knew that David was all dick and balls, and nothing more. The constant hot white liquid filling Bobby was quickly absorbed.
"Carter, looks like you've got a new neighbor! Now, who else can I invite to join our party."