"I can't read all your thoughts, if that's what you're thinking," he said aloud, but she felt his presence in her mind like a lover's caress, trying to soothe her agitation. "Not unless I wanted to, and I can only use Legimency for that, remember? This only works with thoughts you intend for me to hear. As if we're sending letters to each other, but much more quickly. What do the Muggles call it, these days? Texting, I think. I can't know your thoughts if you don't hit "send', metaphorically speaking."