love the cape endeavour thanks Sir James,
I've had plenty of fun with car seat belts in the past.Usually they are wonderfull for a fast restraint while you can prepare for a better position for intimacy, but don't forget that depending on the vehicle the flattening of the front seats can produce an excellent make shift rack in the location of your choice and with the rear lap belts as tentiners then your victim is not only comfortable but secure.
For us i drove into a dark woodland and did just this with all the doors open and watched quietly in the shadows lol.
Ps. practice is a good idea for a surprise lol