"Aidan," Mark said. "Become my cock."
"NO!" Aidan shouted, as he was forced to walk over to Mark. Mark and Aidan both took off their clothes and Aidan sat down on Mark's cock. Mark's cock was a full 8 inches long when erect, and went up Aidan's ass like it was lubed. Mark thrusted himself up and down on Aidan until he ejaculated. The cum went straight up Aidan and a little came out of his mouth. "Ew!" he tried to shout, cum spraying everywhere. He then looked down to see that his own cock had disappeared (but his balls remained there), and that his legs and arms were rapidly shortening. His skin darkened until it was the same tone as Mark's. "NOOOOO!" Aidan screamed. He began shrinking, and the bones in his body disappeared. However, blood was surging through his body, keeping it stiff. He looked down and saw that his balls were now massive compared to himself, and were now Mark's balls. He felt his stomach move back and into Mark's body, becoming Mark's bladder. Finally, his head tilted back and faced up, and he felt himself pulsing with the blood surging through him. He was Mark's dick, although his ears, eyes, and mouth remained.
Mark rubbed up and down the length of his body, eventually ejaculating. It came spewing out of Aidan's mouth. "Well, Aidan, this is your life now: a long Italian cock."