Your girlfriend becomes your new boyfriend

As you watch her transformation, her clothes immediately ripoff as her body begins to grow taller. The first thing you see is your girlfriend's long hair quickly receded up into a very short crew cut. Next, her body starts to gain muscle and height rapidly, while her bones and curves re-adjust into something more masculine. As her frame begins to push out, her breast quickly receded into two well-defined pecs. Then, suddenly, her lightly pale, smooth, and soft skin becomes more tan and more ruff looking. After just another minute, you see standing before you, a rather young and muscular man without a penis. However, you know that the transformation wasn't over. You continue to watch as your girlfriend's vagina starts throbbing and growing wildly, as her slit seals up and becomes a skin sack. Finally, with a few hip thrusts and groans, her vagina becomes "his" 7 1/2 inch penis, and new testicles drop down into the sac. When the transformation was complete, the person that stood before you was no longer your girlfriend, s/he is now a fully man, look totally different than your former girlfriend.