Disclaimer: The X-Men don't belong to me, they belong to Marvel. Suing may get you a pack of gum, that's about it.
"So, why do you want to join?"
"I'm tired. Tired of my friends dying, tired of working so hard, just to be cut down. Tired of saving a human's life to be spit at when they see I'm a mutant. And I'm tired of failing expectations. I'm ready to break clean, and start over."
"Why should I let you in?"
"You know my reputation, my powers."
"I also know your loyalties. I've watched you for years, and never have you given me an impression that you would wish to join me."
"Times change, people change. Maybe I finally see the light."
"Or maybe you are just trying to get an inside knowledge of my operations. Aren't there better ways? All the people you work with, isn't there one of them that would be more convincing?"
"I am not a mole. I was not sent here, I came of my own accord."
"I have no reason to believe you. Maybe I should kill you where you stand. Make future infiltrators think twice."
"You've tried many times to kill me, yet you never have. What makes me afraid of you?"
"Good response. You say you are tired, but haven't you always believed in a different way to achieve your purpose? Or have you finally lost faith?"
"I have lost faith. I have spent years following what I thought was the correct path, but I'm no further than I was before. If my chosen path isn't taking me, or anyone else, anywhere, is it not time to switch paths?"
"Yes, it is. So, you have given up the Professor's dream, have you?"
"Yes, Magneto. His dream is beautiful, as I'm sure you agree. But, it cannot be a reality right now. If it could, I would not be having this conversation with you. So, am I in?"
"Yes, Scott Summers, you are. Welcome to the team."
Note: This is a one-shot. No sequels, unless they appear all written out suddenly on my computer one day.