Sam was looking around in Rebecca's room everywhere but could not find a bikini top. He totally had forgotten that the top was still in the bag he placed in his room when he returned from the beach. In Rebeccas wardrobe he found some of her bras but was not sure whether a bra would help him. Finally he came across an old swimsuit th rebecca wore when she was nine. She had kept it for sentimentsal reasons as she learned how to swim in this suit. Sam decided that this was a female swimsuit anyhow and might help him to turn into a woman.
Sam went to the bathroom to put the swimsuit on as he didn't want John to watch the changes. He wanted toi surprise his friend by walking into the vroom as a complete woman.
In the bathroom Sam didn't hesitate to step into the swimsuit. The fabric seemed to be very elastic as it fit at his body. Then Sam felt something happening. But it were not swelling breasts he noticed but the feeling of shrinking. The room see,med to become bigger. He felt bhis hair growing until it reached down to his butt. His face transformed into that of a girl just before puberty and so did the rest of his body.
In the end Sam had become totally female but not in the way he hoped to. He was a 9-year-old girl now.
The only advantage of his change was that the urge to feel a cock inside him had gone.