The player spent time and resources building one of the most powerful characters, based on his two favorite movie wizards, in a VRMMO that allows users to affect the world. He plays a very venerable and dignified summoner, and stays in character as much as possible. Just to use it before he losses it, he plays with an online vanity box and changes his avatar to a cute little girl. Then he falls asleep before he can change it back.
The player wakes up to find he is his character with the new vanity changes and 30 years in the future (giant shock). The "game" is real; she can smell and taste food and even has to pee. Another shock is that the NPCs have developed personalities and complex lives that seem almost indistinguishable from players. She/he is fortunate that she retains the characters original powers and knows how to use them. She even has a few allies that enjoy the gender/age change.
The fun part is watching her interact with allies old and new, mostly disguising her true identity. The reactions of people she deals with, and even her own faux pas, are priceless as she makes minor errors not used to being a girl. Or when she utilizes power and knowledge of magic far beyond that people believe a little girl could possibly wield.