If Erik is aware (he is), he doesn't give much sign, the same way he acknowledges wanting to tell Raven someday with a noncommittal hum. This is one of the reasons he's not the easiest person to love; his tendency to vocal demonstrativeness is as restrained as the rest of him, and he could dwell on not saying enough of what Charles wants to hear, or he could demonstrate in a way that's vastly more comfortable for him.
So: he hugs Charles more securely against his side, half-closing his eyes in the warm scent of his hair, then shifts back a space to direct, "I like it. Lift your arms for me."
Charles can easily sense the intent in Erik's mind, although for the moment tugging off Charles' cardigan is for intents no more salacious than Erik thinks the soft material would be bulky and unwieldy under the covers. He does much the same with Charles' shirt and trousers, movements efficient but gentle, and when that is done flips the blankets back neatly. It's at this point Charles may be amused by the fact that Erik hasn't so much as taken off his shoes, although he does lean down to unfasten his boots before tucking both himself and Charles under the covers.
"It's not silly to me," he adds once he's settled them against the headboard, half sitting up with Charles tucked against his chest (he has, without really thinking about it, positioned himself between Charles and the wine bottle), "it suits you, and your occasionally baffling ways of thinking."
That is ...a compliment, and once again it's fortunate that Charles can read minds, or at least speaks fluent Erikese. "That's all that has you locked away up here?" His tone of voice suggests - correctly - that he suspects otherwise, but he doesn't push the issue with as much force as is in him. It's spoon bending, not moving a satellite.