When Jon activated the game, he immediately got pulled into it.
Going over to VR was so intense that he had to shut his eyes. When he opened them, he saw that everything looked real, not like a video game, but more like a movie.
He looked around. He appeared to be in a castle. Except, he had played through the game lots of times and he didn't remember this place ever being in the game.
There was a window in the room, looking out into a courtyard, and lots of furnishings. He looked around more at his surroundings and then spotted a mirror. He walked over to it and saw who he had become.
He was Princess Zelda!