Erik manages a good ...three solid seconds where he just lets Charles touch him, eyes drifting shut. He's more tired than he wants to be; he refuses to let his own limitations corral this when he's missed it so much, really, he could strip away any fanciful or even more carnal notions and say he's missed Charles being warm. That would cover it.

Fortunately he's not obliged to wrestle with his own urges for very long as Charles outlines his feelings on Romantic poetry; Erik's lashes sweep up and he grins back, eyes hot, all teeth. "Professor Xavier. I didn't know you had it in you."

He could have chosen different phrasing, but why? Blunt innuendo seems to be the best way to encourage this new turn in Charles (they are, he could muse if he were not abundantly busy, finally getting that comfortable with one another; it only took being whisked away to Cape Horror and the possibility of loss to make it happen), that and tugging idly at the tail of Charles' shirt, undoing the bottom few buttons with elaborate casualness. "Though I am afraid all the Byron I can remember would kill the mood."