Does anyone have a favorite fantasy (or more than one) that they call up while playing?  I tend to imagine myself in a chair with a girl straddling me while facing me.  My nails scratch down her back as she grips my shoulders.  At the bottom of the scratch, I hold her hips to maintain her balance and help with rhythm.  Sometimes I pull her head back by her hair as I bite and kiss her neck, shoulders, and chest.  That tends to be my favorite scenario, but I wondered what other people imagine, especially if the person controlling your toy isn't in the same room.