It does, just a little. If I were going to use magic to code the message it’d need a drop of blood, maybe, but that’s going to take a lot more work.

[ He takes the thread, tucking it below Alucard’s collar to touch the skin. He brushes his cheek with a thumb as he does, softly but deliberately. It’s about the most contact they can make outside of his own chambers. ]

Just stay here and read for an hour or so. I’m going to take one of the horses a little way away from the castle. If you’re still clear a few miles away, I’ll call it a success for now.