It's perfect timing that Hank's serum has started to wear off enough for him to be able to use his telepathy again. He hadn't expected for Erik to say it back. In fact, he'd thought the man might have gone into panic mode even, and so Charles actually leans back a little to look at him, surprised somewhat. The point of him telling Erik had been because he'd simply wanted him to know. Knowing now that the feeling's mutual between them has Charles feeling incredibly happy though.

"You really are so good to me." He's never had anyone to love like this, and no one's ever loved him this way either. "Now I should tell you this, Erik. It looks like you're not going to get much sleep tonight either." Certainly not if he gets his way with him. Charles gives Erik a bit of a cheeky smile then. "Last chance for a nap, my love."