All Jen had to do was make the statement within ear shot and since he hadn't hung up yet he was within ear shot
She had yelled Transform or Dare into the phone and waited for the allotted time.
And as the time expired she made the transformation she had intended. Kyle, she said to no one in particular, you will remain a man, but you will have sex with men but not in the conventional sense.
To have sex you will dock your cock with their cock and as they press in tighter into the cock yours will recede into your body becoming a vagina. You will take their cock and become impregnated by the men. And your pregnancy will be accelerated to the point that you will have your child the next day.
For your dare you will go to your poker game tonight and have sex with every man at the game and have a child every day for the rest of your life.
Kyle couldn't understand why he was heading out to his poker party early that night but as he opened the door there stood Eric. A big black man. Somewhere near enough to 400 pounds of fat and muscle. His cock was the size of a soda bottle and almost a foot long. He pulled Kyle close to him forcing Kyle's cock deep inside of him.
As Eric finished another guy showed up and each one used Kyle in turn.
By the end of the evening he was pregnant with a dozen babies already growing inside of him giving him a more than substantial beer belly look.
Now Kyle was going to be too busy to pass along the curse.
There were several times that Kyle and Jen would have sex. Not that Jen knew she was having sex with Kyle since her cock had grown a mile long and found Kyle's docking cock. But he did remain well pregnant. Popping out his cock after every time he was fucked and giving birth anally.