What's your masturbation fantasy?
That is to say, where or when or how would you want to masturbate that you haven't yet done, but perhaps you fantasize about?
For example, one of my fantasies is to sit at the back of the transit bus and jack off on my way to work. The fantasy is quite doable (as long as no one sits back there with me) since the back seats are partially hidden by a "wall". I can see over the top to all the other seats, but the lower portion of my body is hidden to anyone who might look back. Of course, the lower portion of my body is visible through the window beside me, so I daresay someone outside in passing vehicles or on the side of the road (depending on which side of the bus I sit on) might see me as I'm jacking off. But, certainly that might heighten the excitement.