Hello.
I really liked this one.
I think it would be a real fun idea to introduce the cummbox as a sort of naughty tourist magnet.
I mean wouldn't there be a way to get kinky or open minded tourist chicks riding the box as a sort of dare, or right of passage thing.
It would open the field to all kinds of motivations and dynamics.
Riding the box for money is ok... but mixing some other motivations like a dare or group pressure would open the setting for some very interesting psychology.