Pondering my Secret Mutant assignment...

Of the four prompts of my recipient I could do two, however I tend towards the Charles/Erik prompt. Only I'm not sure what the most plausible backstory would have to be, to achieve the prompt. I mean, I'm doing a drawing, but I need to know what I imagine I'm illustrating, if that makes sense.

Would anyone be interested to help me brainstorm a bit via email to work through my problem? This being an anon gift exchange I don't want to discuss it directly in my journal, even with a lock.