[Elizabeth's words switch on a little lightbulb in Gai's head. He'd never really thought of it before, but now that she mentions it...]

Do you want to get a mirror? I've got a small one we could prop up across from us if you really want to see things for yourself.

[It's a decidedly erotic thought-- both being able to watch what he's doing with his fingers and having Elizabeth be able to see it too.]