Well, with all those vibrations I doubt if he would last long. Not sure about the bungee cord, won't that lessen the vibrations, a bit like suspension on a car? Not tried it so can't say for sure but if his cock, tits and ass are all exposed to some sort of erotic dance from that wand then he'd better descend that meaty pole more quickly than he's doing at pesent or feel the post orgasmic torture that will follow. 
So how long do you intend to keep him impaled up to the balls before he's allowed to relax? How about telling him he'll have to stay completely down after he cums for the same length of time (x 2....x3)  it takes him to take it fully before he cums. You can always enforce that with the ratchet and black rope. 