I'm partial to the e-stim with the microphone so hook him up on the base and head of his cock and throw in the bi-polar ass plug.  For a little more fun, add tit clamps with weights hanging down almost to the floor and place the weights inside a narrow metal cylinder of some kind - buckets, cooking pot, etc - one for each tit, narrow enough so a slight movement would hit the side and make noise.  Of course, he would get zapped and make more noise, you know the routine.  But here's the deal for him to be released.  For every minute the weights do not make contact and there is no noise, you knock off one minute from the hour he's locked up.