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After Magneto of an X2-ish future succeeds in the unthinkable, Charles sends his consciousness back to 1962 to guide Erik away from the path that will lead to the genocide of the human race forty years hence.
Charles knows that Erik has always loved him, and intends to use this knowledge + sex to seduce Erik away from his ideals in his youth.
There's no way this well-thought-out, sensible, debugged and 100% bulletproof plan can possibly go wrong.
- Part 1 of Timeline