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You tell at your girlfriend, but she argues with you. She wants you to follow her, and grabs your hand, tugging you towards a thicket of trees in the park. The crowd is running the opposite direction though, the the two of you struggle to figure out which way to run.
Finally, you agree to go with your girlfriend. You are too late, though, and the gender shift arrives to instantly begin to change the both of you. Your chest expands with breasts, you feel your crotch begin to shrink and the most important part down there become it's opposite. Your hair becomes long and your waist changes to form an hourglass shape. Your butt begins to grow until it's nearly twice as big. The opposite has happened to your girlfriend, or boyfriend now, you are both now the opposite sex to that of 20 seconds ago.