Jake was just about get out of the locker his swim trunks but what he had forgot was that his locker had been moved a couple of days before because they had used the last row of lockers for the women's locker until the ladies locker room is finished getting fixed.
The swim gear he grabbed was a woman's maternity one that still had the tags on them. It looked like it was for someone in the 9th month. As he grabbed it he had felt a shock. He was all of a sudden feeling light headed and seemed to get vertigo so he sat down on the bench. He then felt as if he was putting on weight and then his pecs he could feel them growing, he then got up off the bench and walked which was more of a waddle to the mirror on the wall.
But the reflection was now one of a cross between a male and female. As he is seeing the reflection he sees his penis shrink and then pull up into his body only leaving a vagina in it's place. After about a half hour it seems that the transformation is finished and he sees that it now looks as if the woman could be a female version of him.
He then realized that he needed to put on the suit because he sees that the other students and he didn't to be naked.
He waddled back to the locker and had got the suit on when another bout of vertigo happened. After the vertigo ended what happened was