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Erik can’t help but relish it when Charles looks at him with dark eyes and orders him onto their bed. This is a side of Charles rarely released, no matter how much Erik tries to encourage it.
(He gets it, he does, the only thing more terrifying than a telepath is a domineering telepath, but frankly Erik believes anyone who would be scared of Charles for that reason is a fool and doesn’t know anything about Charles.)
Erik complies, always, even if sometimes he wants to pretend to fight Charles on it. He knows Charles, knows that even if Erik were completely under full telepathic control all he would need to do is be vaguely uncomfortable for Charles to instantly release him and check in. Not that Charles ever went that far. He liked reading minds far more than he liked controlling them.
(Erik fantasizes though, and throws those fantasies at Charles whenever he wants to make the man blush. It’s not just about making Charles more comfortable with all aspects of his power, although it is also very much that, it’s about warming him up to the idea that Erik trusts him enough to be in that position. Charles would like it too, Erik is certain, if he could just get past the thought that Erik isn’t easily able to fight back.)
Normally, Erik doesn’t take to subservience well. When Charles orders him to open him up for Erik, though- well, he sees no reason to resist. Sometimes he can even convince Charles to influence him into it, spider-web puppet strings moving Erik’s hands the exact way Charles wants them. Having Charles exert himself over Erik in such a way makes Erik salivate.
(Some day, Erik will convince Charles to use him more thoroughly. They’ve been in each other’s heads for long enough that Erik knows Charles likes Erik to be present, that Charles simply likes Erik himself, but the idea of Charles having such total control over him… they’re working on it. Erik knows Charles likes the idea too, as much as he is ashamed of it.)
Sex with a telepath is fascinating. Charles can create feed-back loops, letting them both feel what they’re doing to each other; he can take it further and swap their sensations wholly; he can stimulate parts of Erik’s brain to make his senses heightened for short periods; he can cut out parts of Erik’s senses so all he can feel is what Charles wants him to. Erik loves it.
(Erik, once, got Charles to take control of his hips and change their rhythm and angle to how Charles most wanted it. Feeling Charles in his head, guiding his body, seeing the look of pleasure on his lover’s face - it’s something Erik desperately wants to have happen again.)
Erik understands why Charles is hesitant to use his power that way; the man is hyper-aware of the agency of those around him, likely because he could take it away. Erik is still determined to show him that, in their bedroom at least, he’s not taking agency, he’s being given it.