Agreed

 Nate stared at the beautiful woman that he had brought home from the club. She wasted no time and got undressed and pulling off Nate's pants.

      "Now watch carefully what I am doing. You'll have to do this exact thing soon." The woman said with a smile. She started to rub Nate's cock and pulled it out. She started to lick the tip of the cock and tease it. "Enjoy this last ride of your cock because after tonight it will be mine."

     "You can have it as much as you like." Nate said laughing it off.

    "Thanks I needed you to agree to this." The woman said. Her eyes started to glow. Nate tried to move but found out that he couldn't "Take notes babe because before the night is over I'll have you suck my cock." The woman started to give Nate the best blowjob of his life. Nate wanted to fight what he heard, but he couldn't move. As Nate climaxed he realized he didn't ejaculate but instead watched as his cock shriveled and sunk into him. Nate soon was looking at a vagina. Nate watched as his shirt pushed put as his chest swelled. 

    "What did you do?" Nate yelled in a very high voice. 

    "Nothing you didn't agree to. You said I could have your cock and that is just what I did." The woman said. She stood up and Nate watched as a cock started to push out from the woman's vagina. Soon a nice erect cock was there staring Nate in the face. Nate watched as the woman started to change into a copy of him. "Now remember what I said about giving me a blowjob." The woman said pushing Nate to his knees. Nates old dick was inches away from his face and he knew he couldn't fight it anymore and kissed the tip. Nate closed his eyes and slipped the cock into his new mouth.