That is a good question Arya, if you win the TG Grand Prix, does the top 3 winners get to be changed back to guys? I think you need to explain to us about the prize part since you kind of forgot to mention it in you 2nd caption.
But in that caption it seems Mike does not mind being a girl at all. He/She may decide to stay as a girl. Heck if I had a sexy body like that, I problely keep it and amire had good looking I look as a girl. But that's up to you if Mike stays a girl or changes back to a guy.