X-Men: First Class Head Canon

Sometimes, when Erik is alone at night, he closes his eyes and thinks about Charles. He tries to remember his face, his smile, the feel of the tweed jackets under his hands, but he rarely can. He’s a memory so far away from him that he cannot reach it, even if it’s the thing he wants the most.
So he thinks about going to Raven, to beg her to turn into him. But he never does. That would be a lie, and lies are not accepted.