I'm very serious. Nothing happens to you, except that I'll know what you know. It's as relaxing as having a nice cup of tea. Well, a little less. You're awake the whole time and you can see - though not control - exactly what I can look at.

[He tries to think of a way to say 'I won't do it without your permission' without actually saying that he wants her permission, given that the whole point is that she isn't to get a choice.]

If it weren't perfectly safe, Sophie would stop me. Wouldn't you, Sophie? She is a much better person than I am. One of the kindest people I've known in my long life.