Erik laughed - or more accurately he cut air through his teeth, but that was generally the best anyone got from him as far as laughs went - which was as good a sign as any he was going to make it through sudden transplantation without melting a nuclear power plant or anything so potentially dangerous. "I've also been checking on Charles, if it helps."
Hilariously this spoke less to the idea that Raven wasn't a child than that Erik thought Charles needed to be protected as much as they did, but never mind, he wasn't going to explain that. He couldn't articulate it to himself consciously, anyway. It was, ironically, something Raven might be better equipped to express, or at least understand--she had felt the hollow ripped in their little family when Darwin had died, or when Angel had left. Erik hadn't seen those things, but it spoke volumes as to his comprehension of what their group of strangers had become to each other in such a short time--they couldn't bury Darwin, but they could avenge him. Sometimes that was the only thing a person got to do for family.
He wasn't thinking about any of this consciously; it would have taken someone like Charles to pluck it out when his face gave away so little. Raven's talents lay elsewhere, and she wasn't wrong to think Erik approved. Without a need to understand the science of it or take it apart he was as fascinated as Hank, although Raven had been around Erik long enough to understand he thought of Hank's cure as unnecessary and repugnant. His mouth twitched at her assessment of the least likely candidate to administer hairbrush bludgeonings, and he steepled his fingers together with further approval. "Ever considered a career in robbing banks?"
Charles would explode, Erik. For goodness' sake. "Forget I said that, Charles would have my head." Or that. "It's highly adaptive, though, I'm impressed. You have a control I'd have given my eyeteeth for at your age."
Or right now, honestly. "Even if you are using it to wear a mask." His expression was impassive, the bluntness of the statement just what it was. Baby steps: also not in Erik's dictionary, along with compromise. "But I have a proposition for that. If you're interested."