Brian stared down at the dark tube of flesh that joined them. "We can't stay like this! Stuff has to come ougraiihbe..." He suddenly spewed thick, translucent white liquid from his mouth. Gasping and spitting, he stared at the globs of fluid he had just sprayed on Dar and the ground. The teen was grinning at him. Before Brian could say anything, yellowish liquid sprayed from his mouth, and he recognized the smell and taste of piss. He staggered, only to have Dar gab his shoulders to steady him.
Brian felt throbbing in his whole body, and realized that Dar was a lot bigger than he had been. No, Brian was a lot smaller! His eyes widened as pressure rippled from the tube and another massive spray of cum shot from his mouth. Dar rubbed the heavy foreskin covering their shared cock, sending an intense pleasure through Brian's entire body. He shuddered, feeling blood pounding in his head, his arms. Dar reach up and grabbed the sides of Brian's head and rubbed. it was like masturbating, the top of his head sending the erotic sensations of a penis through his body.
Dar slid his hands down, and Brian gasped as the skin just below his neck suddenly separated and slid down. His arms vanished, and he started to fall backwards. Dar hefted him, grinning as Brian's body became rounded within what must be an enormous foreskin. He was becoming the stable boy's cock!