I'm much less interested in "mutant abilities don't work that way" than "women's bodies don't work that way" and "the English language doesn't work that way" and "thematic-narrative logic doesn't work that way," so I don't think familiarity with the canon would be necessary for a beta. Nor to understand the fic itself; all the knowledge required is that the characters involved are telepathic siblings.

I'll send it to the email address in your profile, thanks.