Our TG Caption

You think about the situation for a few minutes until you make your final choice. You don't even bother telling the other guys as you make your wish:
"I wish to be able to swap between my male self and my female self whenever I want."
You feel a wave of magic going through your body. You then try out your new power and turn yourself back into a girl. You then turn towards James and says:
"Here we go! Now, I can be your friend..."
You turn back into a guy to show your power and then turns toward your boyfriend and continue:
"... And your ideal girlfriend!"
You switch to being a girl again and both of the other guys starts laughing. James says:
"That's a great idea!"
Your boyfriend says:
"Who knew the solution could be so easy?"

And just like that, you start a new life of swapping between being a man and being a woman. You love your new life and both James and your boyfriend are glad that you found a way to make everyone happy and they became good friends. Alex is in prison and won't be a problem anymore. That's probably the best ending you could ask for.