Great advice as ever.

I wouldn't say I get 'aroused' by the finger sucking - not in a physical way at least, I keep my self-restraint just below that point, but I suppose if I directed the pleasure in the right way mentally anything is possible.

I certainly do not ask her to do it, but I have been known to pat her lip with my finger in a playful way, which 'reminds her' that she likes that thing, at which point she takes my finger and has her wicked way with it. I am not sure if that is breaking the rulez or not, but she could certainly never say I had ever asked her to do it - she just thinks I did something unrelated that reminded her of it. And I can certainly say that she started it compltely unprovoked the first time, so yes all in all the impulse comes from her.

Thanks again for the advice and rulez.