The bolt of desire that strikes through him is something completely unexpected, makes his hands twitch at his side and his mouth part as he breathes. He feels shaken by it - as though he's once again the same young man who thought this was the highest form of art. He takes Erik in, the languid but powerful way he moves, the teasing way his expression has bent. Charles could just as easily drop into the v of his legs and show him just how much he wants this, he could. But then again, Erik's purr of a voice is talking about teaching and lighting up all the baser parts of his brain. Charles wants to run hands over Erik's skin the same way he does with his library ( reverent and greedy ) and so he moves.

He doesn't have the predator's grace that Erik does but this isn't meant to be as though he's hunting. It's natural to press his knee to the mattress before sliding up to straddle Erik, hands once again cupping his face. The balancing act between them should say something about them in entirety but he doesn't care, just leans in to kiss him as hard as he might, the filthy edge of his teeth catching Erik's plush lower lip between them and tugging ever so slightly.

Hand curling into the hair at the back of Erik's nape, burying his fingers to the knuckles and licking into his mouth with a single-minded need, Charles punctuates every breath with words, lets them loose when he's not trying to climb inside.

"You have no idea the things I want to teach you, Erik," Nuzzling his jaw, "I don't think you have the slightest inkling of what you're letting yourself in for."