Summary:

Catherina (OFC) is a mutant who can create force-fields at will.
She might be one of Erik's most loyal followers, but she can't stand him asking her friends to risk others lives and their lives too.
So she confronts him.
Too bad Erik has others plans for her.

This OFC/Erik Lehnsherr story takes place a few months after X-men: First Class, but doesn't follow the whole storyline of 'First Class'.

I couldn't stand it anymore. Was he serious? Did he expect us to go that far in favor of the cause? To go beyond moral limits for his ideals? Did he really want us to do that for him? No, no. Wait a minute. I didn't sign up for this.

I knew what I was getting into when I joined Erik Lehnsherr's side. I left my friends and family behind in order to have a free life as a mutant, save as many people like myself as possible, and prevent another holocaust in which our kind would end up condemned. But I never thought about what it would take. I could give up the pleasures of an urban life, the frequent visits to bars, the parties and the dancing, meeting new people in those places and all. I had even left my home and quit my job a few months before running away with him, although I had done it for other reasons at the time... Yet, if he had asked me to I would've done it for him. Gladly.

The moment right before Charles had been injured by one of the bullets Erik deflected to save his own life from Moira shooting at him, I knew everything would change. I mean, my own county's navy and the Soviet Union's one were aiming at us and they had already fired their missiles to the beach where we all were. We were a mere group of teenagers and, how many? Five grownups? How on Earth was that a menace to the two more powerful nations in the world! They had made a statement the moment they did that to us, and I had made my choice. Humans —those running our planet— had proclaimed war against our kind, mutants; and I wasn't going to let them rule over us, not yet let them kill, torture and/or use us as their lab rats or slaves. However, that was what changed it all: That statement both the US and the USSR had made against us meant that we, mutants, would have to choose sides. Some chose Charles'. I chose Erik's.

Therefore, there was no way I would stand him insinuating I didn't give a damn about what we called our cause. The sole idea I was some sort of traitor for —in his words— "not fully committing" infuriated me. Who the fuck did he think I was? A little child playing with tin soldiers? I knew what war meant, and I had prepared myself for the consequences of fighting in one. Maybe I was too aware of what it would take...