He looked a little sheepish. "Not that kind," he said. "I mean, that's not why we're writing to each other. She's...Fleur, you can't mention her to anyone."
He wasn't sure if the silencing charm was still in effect, so he cast another. "She's Muggle-born," he said quietly. "She's...she was called in. She didn't show up. You mustn't mention her, in case someone overhears and traces her back to me. Please." He gave her an earnest look.