@ Looky : Yeah it would be a great surprise indeed~
I can imagine it now, there I am taking care of you know what >.> and she happens to like what she see's so she pops out of the monitor, and says she's here to join me ^////^.
Either the girl and I are horny or just the girl is horny and I watch her masturbate. It's about 70/30.
I remember reading through a risque part of a book in class where a girl was fondling herself and a guy was just watching (it was mutual), and it sounded hot.