"Do you mind if I, uh...?" And he sweeps her hair back a little to get a better idea.

"Hm. Well, you could start it in the middle, but Pluto will end up very near the base of your spine. Or we could try for somewhere in the middle of both." He doesn't quite touch her, but she might be able to sense his fingers hovering. He's reminded that, despite the immediate sense of trust he had upon meeting Ruby, they've known each other for less than a week. He is nothing if not respectful of other's boundaries (it comes with the line of work, or at least he feels it should.)

Sitting up again, he says, "I'll show you in a mirror some time, or we can stick the tracing paper to you for you to get an idea."