the wish

As George was holding the wand, he casually makes a wish he could spend time with his son like they used to out on their boat which he knew his son would take out on his own regularly all of a sudden everything freezes around him, and he feels himself changing by getting younger and smaller and getting a full head of long brunette hair and developing breasts and a full female reproductive system then his clothes change to a bikini as he looks in the mirror he sees this.

His own son's girlfriend Emma (model Emma Hix)

while he was becoming her, she was becoming him during time stop they then switch locations leaving her as him at home thinking she is George and him on the boat with his son with enough of her knowledge to pass as her and no wand in sight for either one of them.